Abstract: A vibration machining apparatus and method of use. The vibration machining apparatus includes a cutting tool and a motion stage coupled to one of the cutting tool or the workpiece to move the cutting tool relative to the workpiece. A tangent to a machine path and a normal to the surface of the workpiece define a vibration plane. The vibration machining apparatus further includes a first vibrating unit coupled to one of the cutting tool or the workpiece to vibrate it along a first vibrational direction, substantially in the vibration plane, and a second vibrating unit coupled with one of the cutting tool or the workpiece to vibrate the one of the cutting tool or the workpiece coupled to the second vibrating unit along a second vibrational direction, different from the first direction and substantially in the vibration plane.

Abstract: The present invention relates to a resonator structure, temperature compensation method and temperature control apparatus for controlling local temperature of a resonator structure. At least one heating element (55) is integrated on a substrate of the resonator structure, and a temperature control signal generated based on a stored temperature characteristic is applied to the at least one integrated heating element (55). Thereby, the at least one heating element (55) and an optional integrated sensing element can be provided very close to the resonator. It is thus possible to control or calibrate variations of sensing elements, heating elements and resonator out from every sample.

Abstract: A piezoelectric ceramic composition includes a top-layer, a bottom-layer and at least one intermediate-layer ceramic sheets stacked to each other for sintering. An alloy layer of silver and palladium is interposed between every two ceramic sheets, and a sliver layer is coated on each exposed surface of the top-layer and the bottom-layer ceramic sheets, so as to form a positive and a negative electrode circuit therein. The piezoelectric ceramic composition with the silver layer is attached to at least one surface of a metal plate to make a piezoelectric element which is used to make a piezoelectric actuator, loudspeaker or buzzer.

Abstract: The invention relates to a piezoelectric vibrator easily manufactured and mass-produced. The piezoelectric vibrator includes the piezoelectric bar having a plurality of piezoelectric plates alternately stacked and a plurality of vibration sectors divided vertically and horizontally with respect to the direction in which the piezoelectric plates are stacked. Electrode terminals are formed on each of surface regions of the piezoelectric plate, divided in a longitudinal direction thereof, and jump terminals corresponding to electrode terminals are formed on a surface of an adjacent one of the piezoelectric plates. On side surfaces of the piezoelectric plates, a plurality of side electrodes are formed, connecting the electrode terminals and the corresponding jump terminals to power the vibration sectors, by which a pair of the vibration sectors diagonally disposed from each other are simultaneously powered. The piezoelectric vibrator is small and easily manufactured and mass-produced with a simple structure.

Abstract: A stackable cabinet structure includes at least one cabinet body, being a hollow cabinet body and having a space therein for storing objects, and the cabinet body includes a connecting section at the bottom of the cabinet body; and a plurality of support legs, each having a fixing end movably installed to the connecting section of the cabinet body, such that the cabinet body can be connected to the support legs to form a standalone cabinet or stacked with several other cabinets as a whole cabinet by the connecting sections.

Abstract: The present invention provides an interchangeable, portable storage system for organizing items using flexible dividers, wherein items are organized either within the storage system or within a series of storage systems within a larger device such as a chest freezer, or the like. The system includes a first side panel, a second side panel, a front panel, a rear panel, and a base panel, wherein the panels are constructed such that they form a topless box shape, a plurality of interchangeable divider panels containing a handle with tapered ends and a label area, wherein the side panels include placement fins, creating tracks within which the interchangeable divider panels are removably placed, wherein the storage system and the interchangeable divider panels, once placed within the tracks, includes a plurality of variable storage and organization spaces bounded by a combination of the various panels.

Abstract: A casing 50 of a laundry handling device according to the present invention has a cabinet 100 having a front surface 101 formed with an entrance hole 102 of laundry, and a left and right surfaces 102, 103 formed integrally with one another. And, a back cover 110 is mounted on a rear end of the left and right surfaces 102, 103 of the cabinet 100 to cover the rear surface of the cabinet 100. The cabinet 100 and back cover 110 are mounted to a base 130, and a top plate 120 is mounted to the cabinet 100 and back cover 110. There exists no gap between the left and right surfaces 106, 107 and front surface 101 of the casing 50, this making it possible to eliminate beauty spoiling and deterioration of stability and cleanliness which can occur if there exists any gap, and the number of parts is increased, this making it possible to minimize the number of connecting members and simplify assembling process.

Abstract: An air handling unit 30 (AHU) for housing a number of components used in a heating or cooling system to provide forced air for climate control in a particular structure includes the following interconnected components: a corner fitting construction (16) having symmetric corner portions; a single structural member construction (14); a single insulated panel construction (26) having a peripheral frame (24) providing multiple resilient seals (318, 320) with corresponding contact surfaces of the AHU frame. A corner fitting cap (200) and structural member cap (234) overlie each respective corner fitting (16) and structural member (14), providing enhanced insulative performance for the AHU (30).

Abstract: A track assembly includes a track member, which has two parallel sliding grooves arranged in parallel at two sides and two locating holes spaced between the sliding grooves, a sliding member, which has two sliding rails respectively coupled to the sliding grooves of the track member and two locating holes spaced between the sliding rails, and two torsional springs arranged in the same direction on said track member and respectively connected between the locating holes of the track member and the locating holes of the sliding member such that the torsional springs automatically pushes the sliding rail to the open or close position when the user pushes the sliding rail to the midway toward the open or close position.

Abstract: A plasma display module including a plasma display panel having front and rear surfaces, a chassis base made of a synthetic resin, having mounting holes formed therein, and being mounted on the rear surface of the plasma display panel, a heat conductive sheet disposed between the plasma display panel and the chassis base, a plurality of driving boards being mounted on a rear surface of the chassis base, the driving boards having a plurality of circuits connected to the plasma display panel by means of signal lines, and a plurality of gap pads mounted in the mounting holes formed in the chassis base to transfer heat generated from the driving boards to the heat conductive sheet, thereby discharging the heat.

Abstract: A spark plug provided to ignite fire and generate power for an engine, comprises an outer layer with an inner cavity and a ceramics insulator enclosing a central electrode inside the inner cavity. A gap is located between the ceramics insulator and the housing. The central electrode has a body and a head. One end of the body radically extends and forms a tip. The present invention improves ignition and fuel efficiency, thereby reducing air pollution.

Abstract: The invention relates to a display device having under-gate emitters, i.e. emitters where the gates (203) are arranged under the cathodes (205), beneath an insulating layer (204). In order to protect the emitters from a high electric field from an anode (A), an electron guidance element (207) is placed between the emitters and the anode. This allows a relatively low voltage swing to be used for controlling the electron emission from the emitters from the on-state to the off-state.

Abstract: A field emission device (6), in accordance with a preferred embodiment, includes a cathode electrode (61), a gate electrode (64), a separator (62), and a number of emissive units (63) composed of an emissive material. The separator includes an insulating portion (621) and a number of conductive portions (622). The insulating portion of the separator is configured between the cathode electrode and the gate electrode for insulating the cathode electrode from the gate electrode. The emissive units are configured on the separator at positions proximate two sides of the gate electrode. The emissive units are in connection with the cathode electrode via the conductive portions respectively. The emissive units are distributed on the separator adjacent to two sides of the gate electrode, thus promotes an ability of emitting electrons from the emissive material and the emitted electrons to be guided by the gate electrode toward to a smaller spot they bombards.

Abstract: Electron emitters and a method of fabricating emitters are disclosed, having a concentration gradient of impurities, such that the highest concentration of impurities is at the apex of the emitter tips and decreases toward the base of the emitter tips. The method comprises the steps of doping, patterning, etching, and oxidizing the substrate, thereby forming the emitter tips having impurity gradients.

Abstract: The invention relates to a fluorescent lamp whereof the fluorescent layer consists of from 1 tot 3 water-dispersible phosphors, such that said lamp has a peak wavelength in each of the red, green and deep-red wavelength regions, wherein deep-red phosphor is derived from a non-activated green, water-dispersible phosphor. The fluorescent layer consists preferably of a red, Eu3+ activated phosphor, a green, Tb3+ activated phosphor and a deep-red Mn2+ activated phosphor, wherein said deep-red Mn2+ activated phosphor is a Tb3+,Mn2+ activated phosphor. The Tb3+,Mn2+ activated phosphor is preferably a (GdMg)B5O10:Ce3+,Tb3+,Mn2+ phosphor. Such phosphors can be applied as an aqueous suspension in the production process of a fluorescent lamp.

Abstract: The invention provides a technology suited to suppress decrease in the brightness of an image while preventing reduction in the contrast of the image caused by external light coming from the outside (from the viewer side of the image) of a screen. An image display surface (screen) of a projection type display device is provided with a front protective sheet including an optical filter member for absorbing specific wavelengths in the external light, especially among peak wavelengths of a three-wavelength fluorescent lamp. Moreover, LED's of three colors are used as a light source for forming an image. At least one of these LED's emits a light of a different wavelength from a peak wavelength that the front protective sheet absorbs. By this configuration, it is possible to prevent reduction in the contrast of an image caused by external light without decreasing the brightness of the image display device.

Abstract: A light-emitting device includes a light-emitting element emitting primary light and a wavelength conversion portion absorbing a part of the primary light and emitting secondary light having a wavelength equal to or longer than the wavelength of the primary light. The wavelength conversion portion includes a plurality of green or yellow light-emitting phosphors and a plurality of red light-emitting phosphors. The green or yellow light-emitting phosphor is implemented by at least one selected from a specific europium (II)-activated silicate phosphor (A-1) and a specific cerium (III)-activated silicate phosphor (A-2). The red light-emitting phosphor is implemented by a specific europium (II)-activated nitride phosphor (B). The light-emitting device emitting white light at efficiency and color rendering property higher than in a conventional example can thus be provided.

Abstract: A display panel includes a first substrate, a second substrate arranged opposite to the first substrate, and a column spacer formed on at least one of the first substrate or the second substrate to maintain a space between the first and second substrates, wherein the column spacer has a bottom side having a shape of a concave-sided polygon.

Abstract: A method of correcting bonding misalignment between flat display panel and driver IC is provided. First, the contact pads of the bonding flat display panel and the bumps of the driver IC are bonded, wherein the flat display panel further includes a plurality of alignment marks around each contact pad. A bonding misalignment variation between the flat display panel and the driver IC may be identified by matching the position of the alignment mark and the position of the corresponding bump. Thereafter, a correction may be performed according to the bonding misalignment variation.

Abstract: An organic electroluminescent device includes, on a substrate, a pixel having a luminescent functional layer which is sandwiched by a first electrode and a second electrode, and a unit pixel group composed of a plurality of the pixels. A scattering portion which scatters luminescent light of the luminescent functional layer is provided in a pixel selected from the unit pixel group.

Abstract: An organic electroluminescent device (1) including an anode (2), a cathode (6), and at least a first layer (3), a second layer (4), and a third layer (5) provided between the anode (2) and the cathode (6). At least one of the first to third layers (3), (4), and (5) includes a phosphorescent compound, and at least one of the first to third layers (3), (4), and (5) is an emitting layer. Compounds respectively forming the first to third layers (3), (4), and (5) and having the largest ionization potentials of the respective layers have an ionization potential of 5.7 eV or more and differ in the ionization potential in an amount of less than 1.0 eV.

Abstract: When attaching a substrate with an EL element formed thereon and a transparent sealing substrate, the periphery of a pixel portion is surrounded with a first sealing agent that maintains a gap between the two pieces of substrates, an entire surface of the pixel portion is covered with a second transparent sealing agent so that the two pieces of substrate is fixed with the first sealing agent and the second sealing agent. Consequently, the EL element can be encapsulated by curing the first sealing agent and the second sealing agent without enclosing a drying agent and doing damage to the EL element due to UV irradiation even when a sealing device only having a function of UV irradiation is used.

Abstract: The present invention is a plasma display panel in which a plurality of pairs of display electrodes extending in a row direction are disposed on a surface of a first substrate and a plurality of discharge cells are formed along each pair of display electrodes, wherein, at least within each discharge cell, each display electrode of the pair of display electrodes comprises a bus line and a band-shaped electrode member that is electrically connected to the bus line, the band-shaped electrode member extending in the row direction and being disposed at least mainly on a same side of the bus line as a gap between the pair of display electrodes, and each band-shaped electrode member has at least one cut-out formed from a gap-side edge towards the bus line, each cut-out having a length that is shorter than a distance between the gap-side edge and the bus line.

Abstract: An electroluminescent device (1) comprising a lower electrode layer (10), and an upper electrode layer (2), which are both connectable to a driving circuit (3) and electrically accessible from below, is disclosed. One or more functional layers (5) are disposed between the electrode layers (2, 10) to form an electroluminescent area The device (1) comprises a relief pattern comprising insulating positively sloped ribs (7), in-between which a well (13) is formed. The upper electrode layer (2) has an extension over at least one positively sloped rib (7), and the well (13) is arranged on a first side (7), and a contact surface (4) is arranged on a second side (7?) of the positively sloped rib (7). The extension of the upper electrode layer (2) provides for at least part of said contact surface (4) being covered by said upper electrode layer (2). Thereby, the upper electrode layer (2) becomes accessible from below in the contact surface (4).

Abstract: An apparatus such as a light source is disclosed which has an OLED device and an index bridging elastomer disposed on the substrate or transparent electrode of said OLED device and on the exterior of said OLED device. The elastomer bridges the refractive index between the substrate and an intended target for said apparatus.

Abstract: An organic light emitting device includes a hole transporting layer including two or more regions in which concentration of an impurity doped into a host forms a stepwise concentration gradient.

Abstract: An organic light emitting display device (OLED) and a method of fabricating the same. The OLED includes: a substrate; a thin film transistor on the substrate and including a source electrode and a drain electrode; a first insulating layer on the substrate having the source and drain electrodes; a second insulating layer on the first insulating layer and including a trench; a via hole formed in the trench over the first and second insulating layers and exposing a portion of the source electrode or the drain electrode; a first electrode in the trench and connected to one of the source electrode and the drain electrode through the via hole; a pixel defining layer on the first electrode and having an opening exposing the first electrode; an organic layer in the opening and having at least an organic emission layer; and a second electrode on an entire surface of the substrate having the organic layer.

Abstract: A donor film for a laser induced thermal imaging method capable of improving the optical efficiency of an emission layer, a light emitting device using the same, and a method of manufacturing the light emitting device are provided. The donor film for a laser induced thermal imaging method includes a base substrate, a light to heat conversion layer (LTHC) provided on the base substrate and having a pattern with a predetermined step difference, and a transfer layer provided on the LTHC. It is possible to improve the optical efficiency of the emission layer by patterning the transfer layer using the LTHC having the pattern with a predetermined step difference.

Abstract: An organic electroluminescent (OEL) display device with color level enhancement is provided. The OEL display device includes a plurality of pixels on a substrate. Each of the pixels comprises a first color filter layer, a first electrode, a first OEL layer, a second OEL layer and a second electrode. The color filter layer includes a first, a second, a third and a fourth photo resist. The first OEL layer is disposed on the vertically extended position of the first, the second and the fourth photo resist. The second OEL layer is disposed on the vertically extended position of the second, the third and the fourth photo resist.

Abstract: A gas-permeable plasma electrode has an electrically conductive container with a base which has a hole, and a gas-permeable porous electrically conductive film, with the gas-permeable porous electrically conductive film being arranged opposite the base in the electrically conductive container and being connected to the electrically conductive container, and with the gas-permeable porous electrically conductive film having at least one layer of electrically conductive grains, at least some of which are arranged so as to form a gas-permeable film.

Abstract: A transparent substrate on which a transparent electrode layer is formed is prepared. An insulating layer having a first pattern for exposing a light-emitting region and a first terminal portion and covering a second terminal portion is formed on the transparent electrode layer. Then, an organic layer is formed on the entire surface of the transparent electrode layer and the insulating layer. A reflection electrode layer having a second pattern for covering the light-emitting region and the second terminal portion and exposing the first terminal portion is formed on the organic layer. After that, an exposed portion of the organic layer is removed by dry etching to expose a region of the first electrode layer in the first terminal portion.

Abstract: In an aging process in which a voltage having an alternate voltage component is applied to at least between a scan electrode and a sustain electrode so as to form a discharge dent (sputter dent) on a protecting layer, the aging discharge dent is formed so as to satisfy any one of the following. First, the discharge dent on the scan electrode-side has a width which is narrower than the discharge dent on the side of sustain electrode. Second, the discharge dent on the side of sustain electrode is formed so that the depth of the discharge dent in the area away from a scan electrode paired with a sustain electrode as a display electrode is shallower than the depth of the discharge dent in the area close to counterpart scan electrode.

Abstract: A plasma display panel according to an aspect of the present invention includes a scan electrode and a sustain electrode formed on an upper substrate in parallel with each other, a first barrier rib formed on a lower substrate opposing the upper substrate in parallel with the scan electrode, and a second barrier rib formed in the direction intersecting the first barrier rib, wherein the scan electrode or the sustain electrode comprises at least two or more bus electrodes, at least one of the bus electrodes is formed to be superposed onto the first barrier rib. Therefore, there is an advantage that the brightness is increased, since the area of portions of the bus electrode formed on the discharge space is small and thus the aperture ratio is raised. In addition, the boundary image sticking phenomenon and luminescent spot phenomenon in the non-discharge cell by cross-talk with neighboring cells can be reduced, since the area of portions of the electrode superposed onto the first barrier rib is also decreased.

Abstract: A Plasma Display Panel (PDP) includes a dielectric layer having a plurality of dielectric-layer perforated holes arranged in a matrix; upper and lower electrode layers each having electrode-layer perforated holes connected to the dielectric-layer perforated holes and arranged on both surfaces of the dielectric layer, the upper and lower electrode layers being adapted to receive electrical signals. The upper electrode layer includes a plurality of upper electrodes extending in a first direction, each of the plurality of upper electrodes surrounding a group of the electrode-layer perforated holes arranged in the first direction and including transparent individual electrodes surrounding the electrode-layer perforated holes and linear connection portions adapted to electrically connect the individual electrodes.

Abstract: A barrier rib structure of plasma display panel is disclosed. The barrier rib structure includes a plurality of vertical barrier ribs arranged in parallel, a plurality of first horizontal barrier ribs connected to one side of the vertical barrier ribs, and a plurality of second horizontal barrier ribs connected to the other side of the vertical barrier ribs, in which the first horizontal barrier ribs are disposed alternately with corresponding second horizontal barrier ribs for forming a plurality of double blockade structures. Additionally, a gas passage and a plurality of electrical discharge spaces are formed between the double blockade structures.

Abstract: A plasma display panel of the present invention includes display electrodes and address electrodes that cross each other. The electrode to be covered with the first dielectric layer contains at least one selected from silver and copper. The first glass contains Bi2O3. The first glass further contains 0 to 4 wt % of MoO3 and 0 to 4 wt % of WO3, and the total of the contents of MoO3 and WO3 that are contained in the first glass is in a range of 0.1 to 8 wt %. The first glass may contain, as components thereof: 0 to 15 wt % SiO2; 10 to 50 wt % B2O3; 15 to 50 wt % ZnO; 0 to 10 wt % Al2O3; 2 to 40 wt % Bi2O3; 0 to 5 wt % MgO; 5 to 38 wt % CaO+SrO+BaO; 0 to 4 wt % MoO3; and 0 to 4 wt % WO3, and the total of the contents of MoO3 and WO3 that are contained in the first glass is in the range of 0.1 to 8 wt %.

Abstract: A front filter of a plasma display panel and the grounding of the plasma display panel having the same are disclosed. The front filter of the plasma display panel includes a base film, an anti-reflection film provided at a first surface of the base film, and an electromagnetic wave shielding film provided at a second surface of the base film.

Abstract: A high-pressure discharge lamp (1) comprising at least one burner (2) having a discharge space, and comprising two electrodes extending in said discharge space, a gas filling in the discharge space containing at least an inert gas and a suitable metal halide mixture, and comprising an outer bulb (3) which is attached to the burner (2) and the basic material of which is doped with an absorbing material, the high-pressure discharge lamp (1) comprising at least one interference filter (6) which reflects predominantly in the wavelength range of 400 to 550 nm, and which is arranged directly on at least a part of the outer surface of the outer bulb (3), and the outer bulb (3) being doped with a material that is absorbing for wavelengths <550 nm.

Abstract: A high-pressure discharge lamp (1) having a quartz glass discharge vessel (2) enclosing a discharge space (3) with an ionizable filling, wherein a first electrode (4) and a second electrode (40) are present between which a discharge is maintained during lamp operation, wherein a first seal (5) incorporates a first internal electric conductor (6) which connects the first electrode (4) to a first external electric conductor (7) extending from the seal (5) into the exterior, wherein said first seal (5) further incorporates a gas-filled cavity (10), wherein the internal electric conductor (6) is a foil which extends through the cavity (10), and wherein the foil (6) is provided with at least one hole (11).

Abstract: A manufacturing method of a high-pressure mercury lamp includes an electric field application step in which an electric field is applied to at least a light emission part (4) with the high-pressure mercury lamp being kept at a high temperature. This can reduce impurities such as hydrogen and alkali metals in a discharge space (8) and glass forming the light emission part (4). As a consequence, blackening and devitrification of the high-pressure mercury lamp while the lamp is lit can be reduced.

Abstract: A driving system and method for electroluminescent displays which by connecting the electroluminescent elements that have been lighted up to the electroluminescent elements that are to be lighted up causes charge to be shared among the elements, so as to increase the voltage level at the anodes of the electroluminescent elements which are to be lighted up, thereby reducing the power consumption and increasing the response speed.

Abstract: The invention relates to a blended light lamp (1) having an incandescent lamp (2) and a gas discharge lamp (3), a rectifier (4), an energy storage means (5) and an ignition device (6). The high-pressure discharge has an operating voltage of 180 V, which can be achieved by filling a discharge vessel of the gas discharge lamp (3) with, in particular, an amount of mercury of 153 micromole/cm3. In this way a high total luminous flux can be obtained in the operating state.

Abstract: A ballast for fluorescent tubes and the use thereof for producing fluorescent tube lighting fixtures using a novel gas excitation mode in which light is generated by means of controlled pulses leading to an increased power efficiency, with a data collection and transmission functionality, are disclosed.

Abstract: An output voltage circuit for power supply aims to arrange output DC power according to component voltage and equalizing current. The power supply has a voltage transformation circuit which consists of transformers each has at least one high voltage power and one low voltage power. The high voltage power output from each transformer is coupled in parallel and integrated on the same line to be output to a load at the rear end. Each low voltage power is output through a single line to another load at the rear end. Thus the load of the transformers is reduced and a desired electricity condition can be maintained.

Abstract: A multi-lamp driving system for driving a first lamp and a second lamp includes a power supply circuit, and first-stage transformers. The power supply circuit is used for supplying the first and second lamps with an AC power, and first-stage transformers coupled to the power supply circuit for performing an impedance-matching function to balance lamp currents and deliver evenly distributed current to each lamp in the multi-lamp system so that each lamp provides approximately same amount of luminance. The first-stage transformers includes a first transformer have a primary side coupled to the power supply circuit and a secondary side coupled to the first lamp, and a second transformer have a primary side coupled to the first transformer and a secondary side coupled to the second lamp.

Abstract: A discharge lamp ballast is designed to limit or interrupt its AC output power to the discharge lamp upon occurrence of an abnormal discharge outside of an arc tube. A detector is included to examine a lamp voltage once in each of the positive and negative half-cycles or in each one complete cycle of the AC output power, and identifies the abnormal discharge when there is a particular change in the monitored lamp voltage. The particular change may be defined by a single logic or by combination of several logics each designed to represent specific characteristic for the abnormal discharges of several types.

Abstract: A display apparatus including a display panel to display an image and a back light illuminating the display panel, including an inverter to supply a driving power to the back light, a power supply to supply power to the inverter, a microcomputer to output a back light control signal to control an illuminating function of the back light, a controller to output an inverter control signal to the inverter according to a comparative result comparing an inverter power voltage supplied to the inverter with a predetermined reference voltage when the illuminating function of the back light is in a turned-on state based on the back light control signal.

Abstract: The present invention provides an electronic ballast for a high intensity discharge lamp such as a metal halide lamp. The ballast includes an inverter and a resonant circuit with an ignition capacitor between the resonant circuit and the lamp. The ignition capacitor serves to provide the necessary start-up energy and also serves to provide a low impedance discharge path. A single ignition capacitor may be sufficient, but if a long cable is used to connect the lamp to the ballast, then two ignition capacitors in parallel at opposite ends of the cable may be used. The ballast further provides means for monitoring and controlling lamp power by monitoring a nominally constant dc link voltage, and means for detecting short-circuit and open circuit conditions. A retrial mechanism is provided in the event of the lamp failing to ignite that includes a temporary disabling of the inverter in order to keep the rms lamp voltage low.

Abstract: The light sources (13-15) for illuminating the stope support at a longwall face are operated at low voltage, connected to the control network device (8), for low voltage supply of the system controllers (1-7). LEDs are particularly suitable as light sources. Measures for avoiding an impairment of the function of the system controllers are disclosed.

Abstract: The present invention uses different frequencies to drive the LED strips in the back-lighting source so that the spatial uniformity of the back-lighting source as well as the color levels in the source can be monitored and adjusted. Each individual strip is assigned to a different frequency. Alternatively, the strips are divided into groups and each group is assigned to a different frequency. A group may comprise two or more strips. Furthermore, some groups may have more strips than the other groups and the number of LEDs in one strip may be different from the number in other strips. The brightness uniformity and the color levels in the back-lighting source are sensed by one or more groups of color sensors in R, G and B. The assignment of driving frequencies can be based on the location of the strips.