139results about How to "Improve uneven brightness" patented technology

An organic light-emitting display device and a method of fabricating the device are disclosed. The organic light-emitting display device includes a thin-film transistor positioned on a substrate that has a semiconductor layer, a gate electrode, and source and drain electrodes. A first electrode is positioned, which is connected to either the source electrode or drain electrode. A reflective layer, which is spaced apart from the source electrode or drain electrode, is positioned below the first electrode. An organic functional layer having at least an emission layer is positioned on the first electrode. A second electrode is positioned on the organic functional layer. The first electrode, the reflective layer, the organic functional layer, and the second electrode constitute an organic light-emitting diode.

The invention provides a method for driving a pixel and a driving circuit of the pixel. The method comprises the following steps of: charging the first end and the second end of a first capacitor according to a reference voltage and a reset voltage respectively, and simultaneously switching on a third switch; floating the second end of the first capacitor; charging the first end of the first capacitor according to a data voltage, and switching off the third switch; and floating the first end of the first capacitor, and switching on the third switch. Therefore, a driving current irrelevant with the variation of an N-type thin film transistor process and the span voltage of an organic light-emitting diode can be determined by the voltage difference between the first end and the second end of the first capacitor.

A direct type LED backlight device improves color unevenness on the periphery of the display region without increase of the driver and its control circuit and contour change of a liquid crystal panel. This device includes a bottom wall, a set of optical members arranged opposite to an inner surface of the bottom wall, a side wall maintaining the bottom wall and the set of optical members at a predetermined distance, and LEDs fixed to the inner surface of the bottom wall. The side wall has a protrusion protruding toward a central portion of a space formed by the bottom wall, the side wall, and the set of optical members. At least part of emission surfaces of the LEDs arranged at outermost positions are overlapped with the protrusion and located at such positions as to be invisible when seen along a direction perpendicular to the set of optical members.

The improvement of brightness unevenness. A plurality of pixel circuits 400 is arranged in a pixel region A. Main power lines LR, LG, and LB are provided in the outside of the pixel region A. In addition, first sub-power lines Lr1, Lg1, and Lb1 and second sub-power lines Lr2, Lg2, and Lb2 are provided in the inside of the pixel region A so as to be connected to each other at sub-power line connecting points P. Further, the pixel circuits 400 are connected to the first sub-power lines Lr1, Lg1, and Lb1 at pixel connecting points Q. The structure in which these power lines are arranged in a mesh shape enables a considerable reduction in voltage drop and the improvement of brightness unevenness.

The invention relates to an organic light emitting diode display, which comprises an organic light emitting diode display panel, two wires and a power voltage supply circuit. A display area of the panel is divided into two sub-display areas; the two wires are arranged on the panel and are positioned outside the display area, and first ends of the two wires are electrically coupled with each pixel in the first sub-display area and the second sub-display area respectively; the wiring length of one of the two wires is greater than that of the other wire, so that the resistance of the wire is greater than that of the other wire; and the power voltage supply circuit is used for supplying a high power supply voltage and a low power supply voltage to the second ends of the long wire and the short wire, so that the voltage of the first ends of the two wires are the same substantially.

A dual panel display has a housing, a first display panel, a second display panel, and a backlight module positioned between the first display panel and the fixing face of the housing. The backlight module includes a light guide panel, a light source, at least a transflective film and at least an optical property enhancement film between the light guide panel and the second display panel. The transflective film is positioned between the light guide panel and the fixing face for reflecting a part of light from the light guide sheet so that the part of light passes back into the light guide panel.

The embodiment of the invention discloses an OLED (Optical Light Emitting Device) illuminating device and a manufacture method thereof. The OLED illuminating device comprises a glass substrate, and a transparent anode, an organic functional layer and a metal cathode which are sequentially arranged on the glass substrate, wherein the transparent anode comprises a plurality of display unit electrodes which are mutually independent from each other and auxiliary metal electrodes connected with the display unit electrodes which are mutually independent from each other. The OLED illuminating device provided by the embodiment of the invention not only can solve the problem that the brightness of light emitted by the device is nonuniform, but also can reduce the device damage probability for the occurrence of short circuit points.

There is provided an electro-optical device including a first pixel, a second pixel, a third pixel, a first light shielding portion provided between the first pixel and the second pixel, a second light shielding portion provided between the second pixel and the third pixel, in which a width of the first light shielding portion and a width of the second light shielding portion are different.

The invention provides a liquid crystal display panel and a liquid crystal alignment method thereof. The liquid crystal display panel comprises a first substrate unit, a second substrate unit and a display dielectric layer. The first substrate unit includes a first substrate and a first conducting layer, wherein the surface of the first conducting layer has a first surface root-mean-square roughness. The second substrate unit includes a second substrate and a second conducting layer, wherein the surface of the second conducting layer has a second surface root-mean-square roughness. The display dielectric layer is located between the first and second substrates and comprises a plurality of liquid crystal molecules. The liquid crystal molecules located on the surface of one of the first and second conducting layers have tilt angles, and liquid crystal molecules located on the surface of the other one of the first and second conducting layers don't have tilt angles. The first surface root-mean-square roughness is less than the second surface root-mean-square roughness.

In the invention, each pixel is divided into first sub pixel unit and second sub pixel unit. One end of auxiliary capacitance in first sub pixel unit is connected to coupling signal line for providing voltage of coupling electrode electrically. One end of auxiliary capacitance in second sub pixel unit is connected to the common voltage line for providing common voltage electrically. Thus, the pixel voltage of the first sub pixel unit is different from the pixel voltage of the second sub pixel unit by controlling voltage of the coupling electrode. The invention improves issue of visual angle of liquid crystal display as well as improves uneven brightness caused by different visual angle.

An embodiment of the invention relates to the technical field of display, in particular to a driving method, an array substrate, a display panel and a display device used for improving uneven brightness at junctions of independent common electrode blocks. A gate drive unit sequentially outputs gate drive signals to gate lines according to Hs, effective level time of the gate drive signals is T, wherein (N+1)*THs>T>N*THs, T-N*THs>3delta, and delta> / =R*C. Since T-N*THs>3delta, at the end of effective level in the gate drive signals received by the other gate lines in the adjacent gate lines except for the last gate lines, the voltage difference between a pixel electrode and the common electrode block corresponding to the last gate line in the adjacent gate lines reaches the stable state; therefore, uneven brightness at the junctions of the independent common electrode blocks is improved, and further stripes are generated on a display screen.

The invention provides a pixel compensating circuit of an active matrix organic light emitting diode displayer. The pixel compensating circuit comprises a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a memory capacitor and an organic light emitting diode, wherein the control end of the first switch receives a light emitting pulse signal, the first end of the first switch is electrically coupled with reference voltage, the control end of the second switch receives a second scanning signal, the second end of the second switch is electrically coupled with data voltage, the control end of the third switch receives a first scanning signal, the first end of the fourth switch is electrically coupled with first voltage, the control end of the fifth switch receives the second scanning signal, the control end of the sixth switch receives the light emitting pulse signal, and the memory capacitor is connected between the first end and the second end of the third switch in a crossover mode. Compared with the prior art, the pixel compensating circuit has the advantages that a compensation operation is carried out before the lightening period, the voltage potential of the control end of the fourth switch is increased from the data voltage to the difference value between the first voltage and threshold voltage, a light emitting current is not influenced by threshold voltage shift, stable current output is maintained, and nonuniform luminance of display pictures is improved.

A pixel driving circuit comprises a first to seventh switches, capacitance and a light emitting unit, wherein the first and sixth switches are in a serial connection and respectively receive data voltage and a second reference voltage according to a second and third control signals; one end of the capacitance is coupled to a serial connection point between the first and sixth switches, and the other end is coupled to a control end of the second switch; the third and fourth switches are serially connected between one end of the second switch and the control end, and conducted based on the second control signal; the fifth switch is conducted based on a first control signal; one end of the fifth switch is coupled to a serial connection point between the third and fourth switches, and the other end receives the first reference voltage; and the seventh switch is serially connected between the second switch and the light emitting unit, and conducted based on the third control signal.

The present application provides an electroluminescent display panel, a display device, and a method of manufacturing the display panel for improving a case where brightness of two display regions inthe display panel is uneven. The electroluminescent display panel is divided into a first display area and a second display area, the first display area includes a first light emitting unit, the second display area includes a second light emitting unit, the pixel density of the first light emitting unit is lower than the pixel density of the second light emitting unit, The thickness and / or material of the at least one functional film layer in the first light emitting unit is different from the thickness and / or material of the same functional film layer in the second light emitting unit so thatthe light emitting efficiency of the first light emitting unit is greater than the light emitting efficiency of the second light emitting unit.

The invention relates to a pixel driving circuit which comprises a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a first capacitor and a second capacitor. The first electrode and the control electrode of the first transistor, the first electrode and the control electrode of the second transistor, the control electrode of the third transistor and the control electrode of the fifth transistor are connected with corresponding signal lines. The first capacitor and the second capacitor are connected between the second electrode of the second transistor and a second direct current source in series. The first electrode of the third transistor is connected with the second electrode of the second transistor. The first electrode of the fourth transistor is connected with the second direct current source, the control electrode of the fourth transistor is connected with the first electrode of the third transistor, and the second electrode of the fourth transistor is connected with the second electrode of the third transistor. The first electrode of the fifth transistor is connected with the second electrode of the fourth transistor, and the second electrode of the fifth transistor is connected with a first direct-current voltage source through the positive electrode of an organic light emitting diode. The invention further provides an organic light emitting display. The pixel driving circuit reduces influences caused by wiring and manufacturing, and solves the problem that a panel is uneven in brightness.

The embodiment of the invention provides a gamma adjusting method and device for a display panel, a driving chip and a display device, which are used for performing gamma adjustment on the display panel and improving the brightness uniformity of different areas in the display process of the display panel. The display panel comprises a first display area and a second display area; the display brightness of the display panel has a plurality of brightness levels. The method for performing gamma adjustment under any brightness level comprises the following steps: acquiring a plurality of binding point gray scales corresponding to a second display area; enabling the first display area and the second display area to be displayed in the same binding point gray scale in sequence; under each binding point gray scale, taking the brightness of the second display area under the current binding point gray scale as a reference to obtain regulation and control parameters, corresponding to the binding point gray scales, of the first display area; wherein the absolute value of the difference value between the brightness of the first display area under the regulation and control parameters and the brightness of the second display area under the current binding point gray scale is smaller than or equal to a preset value.

An LCD panel applied to a curved screen includes display sections, each of which includes pixel units. Each pixel unit includes a primary sub-pixel, a secondary sub-pixel, a common electrode, and a sharing capacitance sheet. An area of the sharing capacitance of each display section is adjusted using a sharing capacitance sheet. So a ratio of the charging voltage on the secondary sub-pixel to the charging voltage on the primary sub-pixel in the central display section is between the ratio of the charging voltage on the secondary sub-pixel to the charging voltage on the primary sub-pixel in the first display section and the ratio of the charging voltage on the secondary sub-pixel to the charging voltage on the primary sub-pixel in the second display section. Therefore, the brightness of the curved screen on display is improved. The quality of the curved screen on image display is improved as well.

The invention provides a peripheral circuit structure of an OLED display panel and an OLED display panel. The peripheral circuit structure of the OLED display panel comprises a substrate, an insulating layer arranged on the substrate and a wiring arranged on the insulating layer. The substrate comprises a display area and a border area surrounding the display area. The wiring is located in the border area. Multiple grooves arranged at intervals are formed in an area, corresponding to the wiring, of the insulating layer. The wiring fills the grooves. By arranging the grooves under the wiring and filling the grooves with the wiring, the cross-section area of the wiring can be increased, the IR drop of the wiring can be reduced, the display effect of the OLED display panel can be improved, and improvement can be made on the uneven brightness.

The invention provides a pixel structure comprising a scanning line, a data line, a grid electrode, a source electrode, a drain electrode and a pixel electrode, wherein the scanning wire and the data line are staggered with each other and electrically insulated; the grid electrode is electrically connected with the scanning line; at least part of the source electrode is positioned on the grid electrode and connected to the data line; the drain electrode is at least partially positioned on the grid electrode and opposite to the source electrode; and the pixel electrode comprises a main body part and an extended part, the main body part is electrically connected with the drain electrode, the extended part is electrically connected with the main body part, and the extended part is partially overlapped with the grid electrode and the drain electrode.

The invention provides a pixel circuit, a driving method thereof and a display device. The pixel circuit comprises an organic light emitting diode; the output end of the driving transistor is electrically connected with the anode of the organic light emitting diode; the first end of the compensation transistor is connected with the output end of the driving transistor, and the second end of the compensation transistor is electrically connected with the control end of the driving transistor; the input end of the initialization transistor is connected with the initialization signal line, the output end of the initialization transistor is connected with the second end of the compensation transistor, and the output end of the initialization transistor is electrically connected with the controlend of the driving transistor; and the input end of the anode reset transistor is connected with the output end of the driving transistor and the first end of the compensation transistor, and the output end of the anode reset transistor is connected with the anode of the organic light emitting diode.

The invention discloses a pixel circuit, a driving method and a display device. The pixel circuit comprises a signal input module, a data input module, a light-emitting control module, a compensationmodule, a capacitor module, a driving transistor and a light-emitting device. Through the mutual cooperation of the modules and the elements, the threshold voltage of the driving transistor can be compensated, so that the driving current for driving the light-emitting device L to emit light is not influenced by the threshold voltage of the driving transistor, and the problem of non-uniform light-emitting brightness caused by non-uniform threshold voltage is solved. Moreover, the voltage of the first power supply end can be compensated, so that the driving current is not influenced by the voltage of the first power supply end, and the problem of uneven light-emitting brightness caused by IR Drop of the first power supply end can be solved. Moreover, the range of the data voltage can be enlarged, and the voltage precision requirement of the driving circuit for generating the data voltage is reduced, so that the display effect is greatly improved.

For improving the brightness decay of a display due to its aging, a non-volatile memory such as Flash can be used to store a brightness accumulation value of each point of the display, and each point can be compensated for its brightness accordingly. However, the non-volatile memory suffers from incorrect write-in data or temporary power disconnection, and thus the error will exist all the time to make the display non-even. Hence, the present invention uses a multiple data backups and CRC error detection, plus new / old data comparison to protect data the non-volatile memory from incorrect brightness compensation value so as to uniform the brightness of the display.

To obtain a white reflective film that is hard to warp and can ameliorate unevenness in the luminance even when used in such a manner as to be superimposed on a chassis having convex and concave portions for placing circuits and the like or used with an LED, and can prevent uneven close contact with a light guide plate and damage of the light guide plate, the white reflective film for edge-lit backlight is made to meets the requirements (i) to (iii):(i) the stiffness is 2 to 10 mN·m;(ii) convex portions are formed on at least one surface (A) and the maximum height of the convex portion is 15 to 60 μm; and(iii) the cushion rate at the side of a surface (B) opposite to the surface (A) is 12% or more.

The embodiment of the invention provides a display panel and a display device, and relates to the technical field of display. A problem of uneven brightness of a display image can be solved. In the display panel, multiple first power supply lines extending in the first direction and multiple second power supply lines extending in the second direction are arranged in a display region. The first power supply lines and the second power supply lines cross each other and are connected to form an integrated net-shaped structure which is electrically connected with anodes of multiple OLEDs. At least one driving chip is arranged in a periphery region, and is electrically connected with the net-shaped structure. The net-shaped structure comprises multiple grids which are defined by the first power supply lines and the second power supply line in a crossed manner. In the direction away from the at least one driving chip, the density of the grids of the net-shaped structure in the farther place from the at least one driving chip is bigger. The display panel and the display device are used for display processes of an OLED.