36results about How to "Reduce brightness deviation" patented technology

A driving circuit of a liquid crystal display device and a method for driving the same, which are capable of reducing manufacturing cost of the liquid crystal display device and reducing a luminance deviation so as to improve image quality, are disclosed. The driving circuit of the liquid crystal display device includes an LED backlight which includes a plurality of LED modules arranged in a plurality of division areas and generates light, an internal photosensor which is mounted in any one of the plurality of division areas, for detecting a luminance value, a controller which generates and outputs a plurality of control signals for changing respective luminance values of the plurality of division areas according to the luminance value detected by the internal photosensor, and a plurality of LED drivers which drive the plurality of LED modules according to the plurality of control signals.

Discussed herein are an OLED display device and a method of driving the same. The OLED display device includes according to an embodiment an organic light-emitting diode; a driving transistor involved in driving the organic light-emitting diode and including a bottom gate electrode, an oxide semiconductor layer, a source electrode, a drain electrode and a top gate electrode; a first switching transistor electrically connected to the bottom gate electrode of the driving transistor and involved in transmitting a data voltage to control the driving transistor; a storage capacitor electrically connected to the bottom gate electrode and involved in charging the data voltage; a second switching transistor configured to store a threshold voltage in the storage capacitor; a compensating transistor directly connected to the top gate electrode of the driving transistor to compensate for a deviation in the threshold voltage of the driving transistor; and a compensating capacitor disposed between the source electrode of the driving transistor and a source electrode of the compensating transistor and storing the threshold voltage therein.

A light source module includes a light guide plate having a light incident surface receiving light and a light emitting surface emitting the received light, a board arranged adjacent to the light guide plate and having a light source mounting surface, at least one first light source disposed on the light source mounting surface of the board to provide a first light to the light incident surface of the light guide plate, and at least one second light source disposed on both sides of the light source mounting surface adjacent to the first light source to provide a second light toward the first light source.

The present invention relates to a backlight device and control method thereof, including a case (100); a base substrate (120) installed inside the case (100), and a plurality of LED units (110) modularized and mounted on the base plate (120). In case a part of the plurality of LED units mounted on the base plate is in trouble, a local replacement of an LED unit is possible, so the repair and maintenance are simple and time consuming is short. Further, each of the plurality of modularized LED units is individually controlled in brightness. Therefore, brightness is uniformized among the plurality of LED units to advance the detection precision and the product reliability. In the modularized LED units which can be controlled respectively, the LED units arranged on the substrate fringe have higher brightness, so the brightness deviation is reduced. In addition, the LED units are small in themselves so a plurality of LED units are adjacently arranged to reduce the brightness deviation. Further, a reflecting plate is disposed integrally on the massive substrate of a plurality of LED units of the arranged units, which can simplify the component parts.

The invention discloses a testing method and device for near-to-eye display equipment and a storage medium. The method comprises the steps of adjusting the entrance pupil plane of an image capturing module to be aligned with the exit pupil plane of a near-to-eye display optical system after the entrance pupil plane of the image capturing module is located in the eye box region of the near-to-eye display equipment to form a detection light path, acquiring a picture with a complete test image as a test picture, acquiring a corresponding relation between the test picture and imaging parameters of the test image, acquiring pixel coordinate parameters of pixels meeting a limit value on an image boundary on the test picture based on a preset pixel brightness parameter limit value of the test picture, and calculating and outputting a measurement result of the field of view of the near-to-eye display equipment. According to the testing method provided by the invention, the test efficiency is improved by acquiring the complete test picture, detecting the view field boundary and calculating and outputting the view field degree. The testing device provided by the invention only needs least equipment and system settings, and the test platform is easy to build.

A light source module includes a light guide plate having a light incident surface receiving light and a light emitting surface emitting the received light, a board arranged adjacent to the light guide plate and having a light source mounting surface, at least one first light source disposed on the light source mounting surface of the board to provide a first light to the light incident surface of the light guide plate, and at least one second light source disposed on both sides of the light source mounting surface adjacent to the first light source to provide a second light toward the first light source.

Discussed are an organic light emitting diode (OLED) display device and a method for driving the same. The OLED display device includes pixels each including a light emitting element, and a pixel driving circuit. The pixel driving circuit includes a driving switching element connected in series between high and low-level voltage supply lines, together with the light emitting element, a first switching element for connecting a data line and a first node connected to a gate of the driving switching element in response to a first scan signal, a second switching element for connecting an initialization voltage supply line and a second node connected to a source of the driving switching element in response to a second scan signal, and a third switching element for connecting the high-level voltage supply line and a drain of the driving switching element in response to an emission signal.

A flat panel display, more particularly, a PAM flat panel display featuring low power-consumption is disclosed. The flat panel display includes a current reference generator for generating a data drive current reference for providing a drive current proportional to the size of an input data from outside, and a charge / discharge current reference according to a difference of the data size between the scan lines; and a data driver output for providing directly to the display panel a current corresponding to each of the current references. The flat panel display can be advantageously used in that it reduces the amount or the discharge current that has no effective contribution towards the emission of light by regulating the charge and discharge current of the data drive according to the size of an input data, consequently reducing the total power consumption.

The invention discloses a display panel, a light-emitting control circuit of the display panel, a driving method and a display device, and relates to the technical field of display. The light-emittingcontrol circuit comprises a plurality of light-emitting control circuit sets; and each light-emitting control circuit set comprises at least two light-emitting control sub-circuits. The at least twolight-emitting control circuits can be connected with sub-pixels in the same row, and the colors of the sub-pixels connected with any two light-emitting control sub-circuits are different. In the way,different light-emitting control sub-circuits can be used for providing light-emitting control signals with different duty ratios for the sub-pixels with different colors, and light-emitting durations of light-emitting units in the sub-pixels with the different colors in a display process of a frame of image can be adjusted, so that voltages of data signals output for the sub-pixels with the different colors by a source driving circuit can be adjusted on the premise that the brightness is not changed, the service life of the light-emitting unit with relatively low light-emitting efficiency isprolonged, and the brightness deviation of the light-emitting unit with relatively high light-emitting efficiency, caused by threshold voltage drift is reduced.

The invention discloses a display panel and a display device. The display panel comprises a number of pixel units. Each pixel unit comprises a number of pixel groups. Each pixel group comprises at least one sub-pixel emitting light of one color. At least one side surface of at least one of the pixel groups comprises a solid surface. According to the embodiment of the invention, the pixel unit comprises a number of pixel groups; at least one surface of at least one of the pixel groups comprises a solid surface; and the problem of color cast of the display panel under a non-positive viewing angle is improved.

A driving circuit of a liquid crystal display device and a method for driving the same, which are capable of reducing manufacturing cost of the liquid crystal display device and reducing a luminance deviation so as to improve image quality, are disclosed. The driving circuit of the liquid crystal display device includes an LED backlight which includes a plurality of LED modules arranged in a plurality of division areas and generates light, an internal photosensor which is mounted in any one of the plurality of division areas, for detecting a luminance value, a controller which generates and outputs a plurality of control signals for changing respective luminance values of the plurality of division areas according to the luminance value detected by the internal photosensor, and a plurality of LED drivers which drive the plurality of LED modules according to the plurality of control signals.

Discussed herein are an OLED display device and a method of driving the same. The OLED display device includes according to an embodiment an organic light-emitting diode; a driving transistor involved in driving the organic light-emitting diode and including a bottom gate electrode, an oxide semiconductor layer, a source electrode, a drain electrode and a top gate electrode; a first switching transistor electrically connected to the bottom gate electrode of the driving transistor and involved in transmitting a data voltage to control the driving transistor; a storage capacitor electrically connected to the bottom gate electrode and involved in charging the data voltage; a second switching transistor configured to store a threshold voltage in the storage capacitor; a compensating transistor directly connected to the top gate electrode of the driving transistor to compensate for a deviation in the threshold voltage of the driving transistor; and a compensating capacitor disposed between the source electrode of the driving transistor and a source electrode of the compensating transistor and storing the threshold voltage therein.

The invention discloses a flat panel display, in particular a PAM flat panel display characterized by low energy consumption. The flat panel display includes a current reference generator for generating a data driving current reference supplying a driving current proportional to a size of input data from the outside, and a charging / discharging current reference according to a difference in data size between scan lines; and a data-driven output device for directly supplying currents corresponding to respective current references to the display panel. The advantage of the flat panel display is that by adjusting the data-driven charging and discharging current according to the size of the input data, the amount of the discharging current that has no practical effect on light emission is reduced, thereby reducing the total energy consumption.

Provided is a display apparatus, and even though a light guide portion is very thin, image light beams in high brightness can be emitted from a light-emitting portion, and a transparent member which has a plurality of partial reflection layers can be manufactured to a structure that is suitable for joining in low cost. A light guide system (30) that includes a light-incident portion (40) includinga light-incident curved surface (41) on which image light beams (L) as non-parallel light beams (L) are incident and a light-reflective curved surface (42) which reflects the image light beams (L) such that the image light beams (L) are converted into parallel light beams, and a light guide portion (50) being a portion in which a plurality of partial reflection layers (55) are disposed in parallel. The light guide portion (50) is filled with a parallel light flux emitted from the light-incident portion (40). The light-incident portion (40) is formed of a first transparent member (61), the portion (54) in which the partial reflection layers (55) are formed is formed of a second transparent member (62) which is surface-bonded to the first transparent member (61) via a bonding surface (63),and the bonding surface (63) is inclined in the same direction as that of the partial reflection layer (55).

An organic EL display device (10) is provided with first and second drivers (1, 2), a multitude of switching circuits (US, DS) and a control circuit (5). The first and second drivers are provided with a multitude of output terminals (P). The multitude of switching circuits alternately connect n-number of the output terminal(s) of the first driver (1) (n is an integer of 1 or more) with one and the other of driving lines, which are of the 2n number of organic EL elements and are divided into two, and alternately connect n-number of the output terminal(s) of the second driver (2) with the remaining n-number of the other and the one of the driving lines. The control circuit (5) controls the multitude of switching circuits to switch at the same time by generating a control signal by m frame(s) (m is an integer of 1 or more) or by m horizontal line(s). Thus, brightness variation and brightness nonuniformity can be reduced.

An organic light emitting display apparatus comprises an organic light emitting display panel including a plurality of pixels each including an emission transistor that controls a timing in which an organic light emitting diode emits light; a gate driver outputting gate pulses to a plurality of gate lines provided in the organic light emitting display panel; an emission driver provided in the organic light emitting display panel and outputting an emission signal that controls turn-on and turn-off of the emission transistor to an emission line connected to the emission transistor; a data driver outputting data voltages to a plurality of data lines provided in the organic light emitting display panel; and a controller supplying a first signal and a second signal to the emission driver through one transfer line, wherein the first signal is generated for driving the emission driver when each frame starts, and the second signal is generated for driving the emission driver and has a period shorter than one frame period, and wherein the emission driver generates the emission signal through an emission start signal transferred through the one transfer line.

A display device includes a display unit which includes pixels, an emission driver which applies an emission control signal for allowing the pixels to emit light, and a signal controller which receives a data enable signal including an active period and a blank period during which an image signal is inputted and outputs a control signal for controlling the emission driver such that an emission period of the pixels is changed in response to a blank period.

A display device including a multiplexer and a method of driving the same are disclosed. The display device includes: a timing control section for generating image data, a data control signal, and a gate control signal; a data driving section for generating a data voltage using the image data and the data control signal; a gate driving section for generating a gate voltage using the gate control signal; a display panel including a plurality of sub-pixels and displaying an image using the data voltage and the gate voltage; and a plurality of first MUX switches and a plurality of second MUX switches for sequentially transmitting the data voltage to two sub-pixels of the same color among the plurality of sub-pixels.

A display device includes: a substrate including a display area and a non-display area; and a plurality of sub-pixels arranged in the display area and including portions of an electrode disposed over the display area. The plurality of sub-pixels includes a first sub-pixel and a second sub-pixel to emit light of the same color, a first portion of the electrode of the first sub-pixel has a thickness different from a thickness of a second portion of the electrode of the second sub-pixel, and the first sub-pixel has a size different from a size of the second sub-pixel.

The present invention relates to a plasma display panel. In a plasma display panel according to an embodiment of the present invention, scan electrodes, sustain electrodes, and scan electrodes are sequentially arranged, and the sustain electrodes have an impedance smaller than that of the scan electrodes. Embodiments of the present invention can reduce the difference between the voltage drop of the scan electrode and the voltage drop of the sustain electrode and can also reduce brightness deviation.

The invention discloses a spraying-free colored aluminum pigment and a preparation method thereof. The spraying-free colored aluminum pigment comprises the following components by weight: 50-65 partsof aluminum powder; 10-20 parts of polyacrylic resin; 5-10 parts of polycarbonate; 7-15 parts of an organic pigment; 1-2 parts of aziridine; 0.5-1 part of melamine; and 1-2 parts of a silane couplingagent. The spraying-free colored aluminum pigment has very excellent dispersity and fluidity when subjected to melt injection molding after being mixed with resin, so that the surface color of an obtained colored resin product is bright and uniform, small in brightness deviation and excellent in metal appearance, and flow marks and weld lines can be avoided. The preparation method of the spraying-free colored aluminum pigment provided by the invention is simple and practical, and low in implementation cost.

An electroluminescence display apparatus includes a display panel including a plurality of pixels connected to a first power line, a power circuit converting a final feedback driving voltage input through a first input terminal thereof to output a high level driving voltage to a first position of the first power line through a first output terminal thereof, and a feedback control circuit receiving the high level driving voltage as a first feedback driving voltage, receiving a second feedback driving voltage from a second position of the first power line, and supplying the first input terminal of the power circuit with the final feedback driving voltage adjusted based on a first output contribution rate of the first feedback driving voltage and a second output contribution rate of the second feedback driving voltage.

An organic light emitting display apparatus comprises an organic light emitting display panel including a plurality of pixels each including an emission transistor that controls a timing in which an organic light emitting diode emits light; a gate driver outputting gate pulses to a plurality of gate lines provided in the organic light emitting display panel; an emission driver provided in the organic light emitting display panel and outputting an emission signal that controls turn-on and turn-off of the emission transistor to an emission line connected to the emission transistor; a data driver outputting data voltages to a plurality of data lines provided in the organic light emitting display panel; and a controller supplying a first signal and a second signal to the emission driver through one transfer line, wherein the first signal is generated for driving the emission driver when each frame starts, and the second signal is generated for driving the emission driver and has a period shorter than one frame period, and wherein the emission driver generates the emission signal through an emission start signal transferred through the one transfer line.

The invention belongs to the field of constant-current driving and provides a constant-current driving circuit. A current pre-opening technology is adopted in the constant-current driving circuit; parasitic capacitance is provided instantaneously when the circuit is opened, and flows through an electric energy discharging channel of a power switch pipe Q2, so that the voltage of an output current port of the constant-current driving circuit is quickly reduced to be output when load is completely conducted, the load quickly enters a complete conduction state, and the difference value between the effective conduction time of the load and the effective level time of an enable control signal is greatly shortened; when the load is an LED (light-emitting diode), the corresponding brightness deflection between the practical brightness of the load and set value output by an LED display screen controller is reduced, the displaying effect is optimized, and the user experience is improved.

Embodiments of the present disclosure provide a data signal compensation method for a pixel circuit, including: inputting a test signal to the data signal line, and detecting a real-time voltage at the first node after a first preset time elapses; comparing the real-time voltage with a preset voltage, and in response to the real-time voltage being deviated from the preset voltage, adjusting an initial compensation value for a mobility, so as to make the real-time voltage be consistent with the preset voltage, wherein the preset voltage is set by obtaining an initial threshold voltage for the driving transistor; generating a compensation test signal and inputting the compensation test signal to the data signal line; and generating a test signal, inputting the generated test signal to the data signal line, and sensing a first voltage at the first node after a first preset time elapses as the preset voltage.

A method of making an organic light emitting display device is capable of enhancing the accuracy of a lighting test. The method of making an organic light emitting display device comprises: forming at least one first panel on top of a large substrate and forming at least one second panel on a bottom of the large substrate; forming independent pads, each receiving and transferring power supply from the exterior to the panels formed on the large substrate, the number of independent pads being the same as the number of panels; and forming independent wires between the panels and pads, the independent wires between the panels and pads each having the same length.