Abstract: An optical sheet includes a base film in which light is incident from a lower side, a plurality of prism patterns and a diffusion member. The prism patterns are protruded to be spaced apart from each other on the base film to enhance the front luminance of light incident from the lower side of the base film. The diffusion member is disposed between prism patterns to have a diffusion surface in parallel with the base film. The diffusion member includes a plurality of diffusion dots capable of enhancing the luminance uniformity of light incident from the lower side of the base film. Thus, front luminance and luminance uniformity may be enhanced due to a juxtaposition of the prism patterns and the diffusion portion, and the viewing angle of the LCD device may be enhanced.

Abstract: In an organic light emitting display, a gamma can be applied according to color regardless of the sequence of data output from a data driver, even if a separate gamma by color is used. A method for driving the organic light emitting display is also provided.

Abstract: A method for preparing a CIS (Cu—In—Se) compound includes (S1) producing a plurality of first composite particles having an indium selenide outer layer physically coupled to at least a part of a copper selenide seed particle surface or a plurality of second composite particles having a copper selenide outer layer physically coupled to at least a part of an indium selenide seed particle surface; and (S2) making a CIS compound by thermally treating composite particles selected from the group consisting of the first composite particles, the second composite particles and their mixtures. This method may prevent loss of selenium, which inevitably requires selenium environment, and also improves dispersion, coupling and reaction uniformity for the formation of a CIS compound.

Abstract: A dual display module having a first display panel and a second display panel, the dual display module including a bezel arranged between the first display panel and the second display panel, and having a penetration area between the first display panel and the second display panel; and a supporting member arranged between the bezel and the second display panel and supporting the second display panel, the supporting member having at least one protrusion unit that protrudes through the penetration area to face the first display panel.

Abstract: An organic light emitting display device is disclosed. The device has a drive circuit which generates a reference clock to be used for synchronizing data signals supplied to the pixels. The reference clock is based on the frame frequency. As a result, the display will provide images of consistent quality which do not vary with input data frequency.

Abstract: An organic light emitting display device having low power consumption is disclosed. Power in the device is saved by precharging data lines if the data of the current frame has a higher voltage than the data of the previous frame. Accordingly, if the data lines are precharged the data line driving buffer does not need to use as much power.

Abstract: A stacked structure of a display device is capable of preventing conductive noise due to signal interference by isolating analog and digital output stages and a ground stage onto different layers. A driving device of an organic light emitting display has a scan driver for applying a plurality of scan signals, a data driver for applying a plurality of data signals, and a controller for providing a gradation voltage to the data driver and a scan signal to the scan driver. The stacked structure includes a ground layer, an analog signal-transmission layer for transmitting an analog signal, a digital signal-transmission layer for transmitting a digital signal and a power supply transmission layer for transmitting a power supply voltage. Each of the layers is formed on a different layer. Further, the stacked structure further includes a first mounting layer at a front of the structure on which circuits are mounted and a second mounting layer at a rear thereof on which circuits are mounted.

Abstract: A light emitting display includes a substrate, a pixel area, a first power source line to supply a first power signal to each pixel on a first side of the pixel area, a second power source line to supply the first power signal to each pixel on a second side of the pixel area, and an impedance compensator for compensating a difference in a voltage drop between the first power source line and the second power source line. A voltage drop caused by line resistance that depends on the length of the first and second power source line that supply the first power signal to a lower and upper side of a pixel area, respectively, is equalized, thereby minimizing the voltage drop of the first power signal supplied to all pixels, and minimizing non-uniformity of brightness due to the voltage drop differences at each pixel.

Abstract: An organic EL display device for compensating for a reduction of the voltage between the gate and source of a driving transistor occurring due to a voltage drop of the source voltage caused by the resistance component of a power source line, and a method for driving the organic EL display device. The organic EL display device has a data driver for receiving digital image data and applying the digital image data and a data voltage corresponding to the position of a pixel circuit. The data driver outputs different data voltages depending on the position of the pixel circuit even when the same digital image data are received. When the driving transistor is a P-type transistor, the data driver applies a higher data voltage to a pixel circuit that is closer to an external voltage source than that applied to a farther one even when the same digital data are received.

Abstract: A power supply device supplying power to a data driver of a light emission display device. The power supply device includes: an external reference voltage supply supplying an external reference voltage; a reference voltage generator converting external power into a regulated direct current (DC) reference voltage and outputs the regulated DC reference voltage when the external power is changed. A reference voltage selector selects one of the reference voltages output from the external reference voltage supply and the reference voltage generator and outputs a selected reference voltage. A voltage converter converts the regulated reference voltage output from the reference voltage selector into a plurality of internal DC power sources to be supplied to the drivers.

Abstract: A memory managing method for display data of a light emitting display device, which uses field light-emitting of organic materials. A plurality of pixels are each provided with at least two sub-pixels to emit different color lights, wherein one field has at least first and second subfields divided and driven independently. At least two data signals corresponding to substantially the same color are time-divided and applied to a data line during the one field, and selecting signals are sequentially applied to a plurality of scan lines at the first and second subfields. The method includes a) dividing input data corresponding to a display image into data for the first and second subfields, b) arranging the data for the first and second subfields according to a sequence of light-emitting driving, and c) storing the arranged data as pixel-based data.

Abstract: A display panel driver of a display device having a main panel and a sub-panel, the display panel driver including a scan driver for selectively applying selection signals to a plurality of scan lines; a data driver for applying data voltages corresponding to image signals to a plurality of data lines; and a drive controller for selectively enabling a part of the scan driver while synchronously driving the data driver, wherein the main panel and the sub-panel are arranged in opposite directions, and wherein the scan driver comprises a main scan driver for driving the main panel and a sub-scan driver for driving the sub-panel. With this configuration, control signals different from the enable signal are inputted to the main scan and sub-scan drivers, and therefore, a driving integrated circuit (IC) can be readily designed.

Abstract: A display panel driver of a light emitting display having a main panel disposed on a front surface and a sub panel disposed on a rear surface. The display panel driver includes a main scan driver sequentially applying selection signals to a plurality of scan lines in the main panel along a first direction, a sub scan driver sequentially applying selection signals to a plurality of scan lines in the sub panel along an opposite direction of the first direction, and a drive controller respectively controlling scanning directions of the main scan driver and the sub scan driver.

Abstract: A power supply device supplying power to a data driver of a light emission display device. The power supply device includes: an external reference voltage supply supplying an external reference voltage; a reference voltage generator converting external power into a regulated direct current (DC) reference voltage and outputs the regulated DC reference voltage when the external power is changed. A reference voltage selector selects one of the reference voltages output from the external reference voltage supply and the reference voltage generator and outputs a selected reference voltage. A voltage converter converts the regulated reference voltage output from the reference voltage selector into a plurality of internal DC power sources to be supplied to the drivers.

Abstract: A stacked structure of a display device is capable of preventing conductive noise due to signal interference by isolating analog and digital output stages and a ground stage onto different layers. A driving device of an organic light emitting display has a scan driver for applying a plurality of scan signals, a data driver for applying a plurality of data signals, and a controller for providing a gradation voltage to the data driver and a scan signal to the scan driver. The stacked structure includes a ground layer, an analog signal-transmission layer for transmitting an analog signal, a digital signal-transmission layer for transmitting a digital signal and a power supply transmission layer for transmitting a power supply voltage. Each of the layers is formed on a different layer. Further, the stacked structure further includes a first mounting layer at a front of the structure on which circuits are mounted and a second mounting layer at a rear thereof on which circuits are mounted.

Abstract: An organic EL display device for compensating for a reduction of the voltage between the gate and source of a driving transistor occurring due to a voltage drop of the source voltage caused by the resistance component of a power source line, and a method for driving the organic EL display device. The organic EL display device has a data driver for receiving digital image data and applying the digital image data and a data voltage corresponding to the position of a pixel circuit. The data driver outputs different data voltages depending on the position of the pixel circuit even when the same digital image data are received. When the driving transistor is a P-type transistor, the data driver applies a higher data voltage to a pixel circuit that is closer to an external voltage source than that applied to a farther one even when the same digital data are received.

Abstract: A column transistor of a sense amplifier includes an orthogonal matrix of a plurality of sets of four active regions, bit lines and local data lines running perpendicular to each other, with each active region having two bit lines and one local data line connected thereto. Further, the gate electrode is provided with a bent portion, the bent portion positioned over the active region, thereby increasing the effective width of the transistor, which in turn reduces a number of contacts of the column transistor and increases channel width, thereby permitting the column transistors to be arranged in a smaller area and increasing the area available within a cell for forming the sense amplifier. The reduced size of the column transistors also allows increases in design and manufacturing tolerances, particularly in formation of contacts, which is favorable for high density device packing and enhancing the operational performance of the resulting device.

Abstract: A column transistor of a sense amplifier includes an orthogonal matrix of a plurality of sets of four active regions, bit lines and local data lines running perpendicular to each other, with each active region having two bit lines and one local data line connected thereto. Further, the gate electrode is provided with a bent portion, the bent portion positioned over the active region, thereby increasing the effective width of the transistor, which in turn reduces a number of contacts of the column transistor and increases channel width, thereby permitting the column transistors to be arranged in a smaller area and increasing the area available within a cell for forming the sense amplifier. The reduced size of the column transistors also allows increases in design and manufacturing tolerances, particularly in formation of contacts, which is favorable for high density device packing and enhancing the operational performance of the resulting device.

Abstract: There is disclosed a method for manufacturing a semiconductor substrate having a compound semiconductor layer on a single-crystal silicon wafer, the method comprising the steps: sequentially forming first and second compound semiconductor epitaxial layers on a compound semiconductor wafer; forming a first silicon oxide layer on the second compound semiconductor epitaxial layer at a predetermined low temperature and depositing a poly-crystal silicon layer on the first silicon oxide layer; removing portions of the larminated layers by using a etching technique to form grooves on the compound semiconductor wafer; depositing a second silicon oxide layer overlying thereon at a predetermined low temperature; etching back horizontal portions of the second silicon oxide layer to form side walls in each of the grooves and polishing the polysilicon layer to form a planar surface thereon; bonding the planar surface and the single-crystal silicon wafer by using a thermal process technique; removing the compound semicondu