Abstract: A backlight which arranges light emitting diodes on a side surface of light guide plate adopts the structure which allows the easy removal of the light guide plate from a mold and makes it difficult for a stress or the like to influence the fine structure of a light incident portion of the light guide plate. In a liquid crystal display device having a backlight which radiates light to a liquid crystal panel, LEDs which constitute a light emitting element are mounted on a light guide plate which is mounted on a backlight, and edge portions of the light guide plate are tapered such that a width of the light guide plate is increased in the removal direction of the side surface of the light guide plate. Further, an ejector-pin mark is formed on a lower surface of the light guide plate by pushing an ejector pin in the removal direction of the light guide plate.

Abstract: A liquid crystal display device by the use of such a high quality light source in order to suppress brightness distribution and chromaticity distribution of a light source. The liquid crystal display device comprises a white light source provided with a blue phosphor that emits blue light, a green phosphor that emits green light, and a red phosphor that emits red light and a liquid crystal display panel having color filters to adjust the amount of transmitted light from the white light source for every pixel and transmit any one of blue, green, and red lights for every pixel, where the red phosphor to be used is represented by a composition formula (Y1-x-y,Gdx,Euy)2O3. At this time, it is desirable that the conditions of 0.45?x?0.85 and 0.025?y?0.040 respectively are satisfied.

Abstract: A liquid crystal display panel formed by using a TFT substrate and a color filter substrate is polished to decrease the thickness thereof so that it can be curved. The liquid crystal display panel and various optical sheets are sandwiched between a frame forming a curved surface and a light guide plate forming a curved surface, to thereby form a curved surface. An upper polarizer plate and a lower polarizer plate are, respectively, sandwiched between the surface cover and the liquid crystal display panel, and between the liquid crystal display panel and the optical sheet, and are not adhered or are partly adhered to the liquid crystal display panel.

Abstract: A liquid crystal display comprising the feature that a backlight comprises a cold cathode ray tube disposed on a surface facing a liquid crystal display panel and a chassis for supporting the cold cathode ray tube, and the cold cathode ray tube is set so that a distance from the chassis at an end to which a high voltage is applied becomes larger than a distance from the chassis at an end to which a low voltage is applied.

Abstract: An object of the present invention is to improve the color reproduction capability of a liquid crystal display backlight using white LEDs. A backlight of the present invention includes: a light guide plate 6; a light diffusing optical waveguide 3 disposed adjacent the light guide plate 6; a plurality of white LEDs 1 disposed on the light diffusing optical waveguide 3; and single color LEDs (red LEDs) 2 disposed on respective opposite sides of the light diffusing optical waveguide 3; wherein light from the white LEDs 1 passes through the light diffusing optical waveguide 3 and enters the light guide plate 6 through a side thereof, whereas light from the single color LEDs 2 is diffused by the light diffusing optical waveguide 3 before entering the light guide plate 6 through the same side thereof. Thus, the light diffusing optical waveguide 3 mixes light from the white LEDs 1 and single color LEDs 2, resulting in improved color reproduction capability of the backlight.

Abstract: The present invention provides a liquid crystal display device having a linear light source, which is easily treated, in consideration of the heat radiation of a light-emitting diode in the liquid crystal display using the light-emitting diode as a light source. A light-emitting diode 150 is provided on a metal substrate 161. The metal substrate 161 is formed in a case shape such that the heat generated at the light-emitting diode 150 received in the case is efficiently radiated. A resin material 175 is filled in the metal case to form a plate-shaped light source 130. It is possible to improve reliability during the handling in the manufacturing process by filling the resin material 175 to form the plate-shaped light source. It is possible to improve heat radiation effect by filling the resin material 157.

Abstract: To provide a liquid crystal display device that includes a cold cathode fluorescent lamp that controls a drop in the luminous efficacy of a fluorescent substance layer in a large electrical current region. Uneven portions UNE are formed in a surface of a fluorescent substance film FLU that is formed on an inner wall surface of a glass tube VAL that configures a cold cathode fluorescent lamp CCFL, whereby the surface area of the film surface can be increased and a drop in the fluorescent substance luminous efficacy in a large current region can be controlled, so the effect of improving the luminance of a display screen over a long period of time is obtained as a backlight of a liquid crystal display panel LCD.

Abstract: A display device includes a display panel, a frame, an elastic spacer arranged on a peripheral portion of the display panel in parallel to the edge of the display panel, the elastic spacer being arranged between the display panel and the frame. A hardness of the elastic spacer varies along the length-side direction of the elastic spacer.

Abstract: In a liquid crystal display device which uses light emitting diodes as a light source, a backlight can efficiently house a heat radiation plate even when an area of the heat radiation plate is increased by taking the radiation of heat from the light emitting diodes into consideration. Light emitting diodes are arranged on a metal substrate to form a plate-shaped light source portion. A heat radiation effect is enhanced by adhering a heat radiation plate to the plate-shaped light source portion. The heat radiation plate to which the plate-shaped light source is adhered is constituted as a housing casing thus efficiently housing the heat radiation plate. A problem which occurs due to the use of the metal-made housing casing can be overcome by mounting a resin-made light guide plate fixing member on the housing casing.

Abstract: In a backlight which arranges light emitting diodes on a side surface of a light guide plate, even when the light emitting diodes having a thickness larger than a thickness of the light guide plate are used, it is possible to manufacture the light guide plate with high accuracy by injection molding. In a liquid crystal display device having a backlight which radiates light to a liquid crystal panel, LEDs are mounted on the light guide plate formed on the backlight as a light emitting element, and an S-shaped inclined portion whose thickness is not changed is formed on the light guide plate from a light incident surface to a light emitting surface of the light guide plate. Since the thickness of the inclined portion is not changed, it is possible to make the pressure of resin flow at the time of performing injection molding uniform thus manufacturing the light guide plate with high accuracy.

Abstract: The invention relates to a fluorescent lamp with an external electrode used as a backlight of a liquid crystal display device or others. To reduce invalid parts of the backlight, the length in an axial direction of an external electrode of the fluorescent lamp is required to be reduced. Therefore, a concave portion is provided to the end of the fluorescent lamp with an external electrode, and by forming the external electrode in the concave portion, the total area of the external electrodes is secured. Even if the length in the axial direction of the external electrode is short, discharge is stabilized. Graphite is used for the external electrode; however, graphite in which a water glass component is increased to enhance its mechanical strength is used.

Abstract: A liquid crystal display panel includes a TFT substrate and a color filter substrate respectively formed of a glass substrate. By housing the liquid crystal display panel in the inside of a frame having a curved surface, a predetermined curved surface is imparted to a display screen. Using a direct backlight having a plurality of fluorescent lamps, distances between the respective fluorescent lamps and the liquid crystal display panel are set to a fixed value. A diffusion plate has a curved surface substantially equal to the display screen. By mounting respective optical sheets on the diffusion plate, predetermined curved surfaces are imparted to the respective optical sheets. Due to such constitution, it is possible to realize a liquid crystal display device having a curved surface without using a complicated optical system.

Abstract: A planar illumination device is provided that can achieve even distributions of mixed colors and luminance, downsizing and weight saving without lowering the luminous efficiency of LED chips. In addition, a liquid crystal display device using the planar illumination device as a backlight is provided. A polygonal flat plate-like light guide plate GLB is combined with a plurality of LED chips D1, D2, D3 emitting light with different colors from each other to constitute a color mixing unit DUT. A plurality of the color mixing units are arranged on printed circuit boards RFB having a reflection function to constitute a planar illumination device. The planer illumination device is installed on the back of a liquid crystal display panel, thus constituting a liquid crystal display device.

Abstract: The present invention provides a display device of high brightness which can eliminate brightness irregularities on a display surface while preventing the degradation of display quality attributed to an undesired electric field generated at the time of performing inverter driving of the cold cathode fluorescent lamps of a backlight. In a liquid crystal display device, a plurality of cold cathode fluorescent lamps of a backlight unit is arranged along a short axis of the display device. The cold cathode fluorescent lamp has a high-voltage electrode thereof connected to an inverter circuit and a ground electrode thereof connected to a ground. Further, the plurality of cold cathode fluorescent lamps arranged along the short axis have electrodes thereof arranged alternately between the high-voltage electrode and the ground electrode.

Abstract: The present invention provides a backlight of a liquid crystal display device having an inclination surface on a light guide plate and preventing a breakage of a liquid crystal panel, wherein light which leaks from the inclination surface is made to return to the light guide plate and the adhesiveness of the light guide plate and a flexible printed circuit board is increased. In a liquid crystal display device having a backlight which radiates light to a liquid crystal panel, LEDs are formed on a light guide plate formed on the backlight as light emitting elements. Between the plurality of light emitting elements, a projecting portion of the light guide plate is formed, and a reflection member is formed on an adhesive sheet which adheres a projection member and a flexible printed circuit board to each other.

Abstract: A cold cathode fluorescent lamp includes a tube having an inner surface coated with a fluorescent film and tubular discharge electrodes disposed at both inner ends of the tube. Each discharge electrode has an opening facing a discharge area and includes a projection in the opening, the area of the projection being reduced by electric discharge.

Abstract: A liquid crystal display device of the present invention includes a liquid crystal display panel, and a backlight arranged on a back surface of the liquid crystal display panel. The backlight includes a plurality of rod-shaped light sources, electrode fittings for holding the rod-shaped light sources, and side wall plates covering the electrode fittings. The electrode fittings are connected to a connection portion extending in the parallel-arrangement direction of the rod-shaped light sources. The side wall plate includes a plurality of projecting members arranged in parallel to each other in the extending direction of the connection portion. The connection portion includes positions which are brought into contact with the projecting members and portions which are not brought into contact with the projecting members. By adopting the above-mentioned constitution, the liquid crystal display device can reduce squeals and the like.

Abstract: A liquid-crystal display device is provided which has a backlight that applies light onto a liquid crystal panel. The backlight includes a light guide having an LED as a light-emitting device. The light guide has recesses on the light incident surface, in which electric elements are disposed. Disposing the electric elements connected to external driving circuit in the backlight can reduce the area for mounting the electric elements.

Abstract: The present invention provides a liquid crystal display device which can largely enhance a property of focusing light from a backlight. The backlight arranged on a back surface of a liquid crystal panel includes a light guide plate, a light source, a first asymmetrical prism sheet, and a second asymmetrical prism sheet. A reflection surface having an inclination of 2° or less for guiding light from the light source toward the liquid crystal display panel is formed on a back surface of the light guide plate. The first asymmetrical prism sheet and the second asymmetrical prism sheet respectively include projecting portions which extend in the arrangement direction of the light source and are arranged in parallel to each other in the direction which intersects the arrangement direction of the light source.

Abstract: A liquid crystal display is provided with a cold-cathode fluorescent lamp including a glass mantle tube having an inside surface coated with a fluorescent film, cup-shaped electrodes disposed in opposite end parts of the mantle tube with their open ends opening into a discharge region in the mantle tube. A discharge inducing ITO film is formed in a part near each of the cup-shaped electrodes of the inside surface of the mantle tube. Cosmic rays from space penetrated the transparent glass tube and the fluorescent film and received by the discharge inducing ITO films activate free electrons moving in the glass tube and, at the same time, electrons emitted by the cup-shaped electrodes when a voltage is applied across the cup-shaped electrodes induces an electric discharge to make the cold-cathode fluorescent lamp light instantly.