633 results about "Afterimage" patented technology

To prevent the display image from becoming unclear due to an overlap of the afterimage of the display image of the preceding frame period with the display image of the current frame period so that the image quality of the motion picture may be improved, a display apparatus includes a display surface having a plurality of pixel lines and a write circuit adapted to sequentially write an image into each of said plurality of pixel lines. The write circuit writes, during a time period for writing said image into at least one pixel line, a black color into another pixel line. The another pixel line is separated from the at least one pixel line by a predetermined distance. The write circuit writes the black color into a plurality of pixel lines separated from the at least one gate line by the predetermined distance.

A ferroelectric liquid crystal display including an upper base plate and a lower base plate which are disposed apart from each other at a predetermined distance, electrode layers respectively formed on the upper base plate and the lower base plate facing each other, orientation layers respectively formed on the electrode layers and treated by rubbing in a first rubbing direction and a second rubbing direction which intersect at a predetermined angle, and a liquid crystal layer disposed between the orientation layers and filled with a ferroelectric liquid crystal having a bookshelf structure. Due to the ferroelectric liquid crystal display and the method of manufacturing the same, the ferroelectric liquid crystal of the bookshelf structure can stably twist by the treatment of the orientation such that an afterimage phenomenon is prevented and further a low threshold voltage and a bistability can be obtained.

An alignment film is given a 2-layer structure comprising a photoalignment film that is photoalignable and a low-resistivity alignment film whose resistivity is smaller than that of the photoalignment film. The photoalignment film is formed by a polyimide whose precursor is polyamide acid alkyl ester, the number molecular weight of the photoalignment film is large, and the stability of alignment of the photoalignment film by photoalignment is excellent. The low-resistivity alignment film is formed by a polyimide whose precursor is polyamide acid, the number molecular weight of the low-resistivity alignment film is small, and the resistivity of the low-resistivity alignment film is small. The 2-layer structure alignment film can be maintaining an excellent photoalignment characteristic, so DC afterimages can be controlled.

A liquid crystal display device that includes an array substrate, an opposite substrate and a liquid crystal display layer is described. The array substrate includes a pixel electrode and a lower alignment layer. The pixel electrode has a plurality of slit portions extending in different directions. The lower alignment layer includes a reactive mesogen (RM) diamine is formed on the pixel electrode to induce an alignment direction of the liquid crystal molecules. An upper alignment layer is formed on a common electrode of the opposite substrate. The RM is cured at surfaces of the lower and upper alignment layers in response to ultraviolet (UV) light, so that liquid crystal molecules have a pretilt angle. Therefore, the aperture ratio and the response time may be improved, and afterimages may be decreased, so that display quality may be improved.

The invention discloses a method and system for eliminating an afterimage defect of a static-state image display area, and is applied to a self-luminous display apparatus. The static-state image display area comprises at least two sub pixels of the same type yet with different grayscale values. The method comprises: obtaining the first grayscale value of a sub pixel of a reference type corresponding to the static-state image display area, wherein the reference type is any one from RGB types, and the first grayscale value is the maximum grayscale value in the grayscale values of all the sub pixels of the reference type; according to the first grayscale value, determining a second grayscale value, the second grayscale value being greater than or equal to the first grayscale value; and driving a reference sub pixel to work continuously for corresponding reference compensation time, and closing a sub pixel whose grayscale value is equal to the second grayscale value, wherein the reference sub pixel is any one sub pixel of the reference type, whose grayscale value is smaller than the second grayscale value, and the reference compensation time is the continuous work time of the reference sub pixel. By using the technical scheme provided by the embodiments of the invention, once an image of the self-luminous display apparatus generates the afterimage defect problem, the problem can be rapidly eliminated.

First-third light emission parts, wherein plural LEDs are disposed, are provided in front surface of a first display plate. Synchronized with the rotation of the first display plate, the LEDs in the light emission part light on and off to display symbols or images by utilizing afterimage effect. When the first display plate stops rotation, the first-third light emission parts are lighted on and off sequentially. When one of the first to third light emission parts is lighted on, an amount of dividend coins is determined by the numbers on a second display indicated by the lighted light emission part and a fixed indicator. Thus, the LEDs in the light emission part are used not only as image display device but as an indicator.

In the provided liquid crystal display apparatus, a first switching element receives a first data signal and a second switching element receives a second data signal having a polarity opposite that of the first data signal. A first pixel electrode is electrically connected to the first switching element to receive the first data signal and a second pixel electrode is electrically connected to the second switching element to receive the second data signal. The second pixel electrode faces the first pixel electrode and is electrically insulated from the first pixel electrode. A liquid crystal layer has liquid crystal molecules aligned in response to the first and second data signals applied to the first and second pixel electrodes, respectively. Thus, the liquid crystal display apparatus may prevent afterimages on a screen thereof and a flickering phenomenon.

A liquid crystal display ("LCD") for eliminating afterimages includes: a power supply, a gate driver, and a discharger. This power supply detects the interruption of the external supply voltage and provides a discharge signal. The gate driver provides gate driving signals to the plurality of gate lines simultaneously in response to the discharge signal, and the discharger provides a common voltage to the plurality of data lines in response to the discharge signal.

An organic light emitting display and a method of erasing an image sticking thereof are provided. In the image sticking erasing method, a panel driving circuit is driven by a logic power voltage during a power-off delay time to discharge pixels.

A low-resolution image is displayed at higher resolution and afterimages are reduced. Resolution is made higher by super-resolution processing. In this case, the super-resolution processing is performed after frame interpolation processing is performed. Further, in that case, the super-resolution processing is performed using a plurality of processing systems. Therefore, even when frame frequency is made higher, the super-resolution processing can be performed at high speed. Further, since frame rate doubling is performed by the frame interpolation processing, afterimages can be reduced.

A method of improving the afterimage phenomena for LCD is suitable for improving the afterimage phenomena produced after the LCD is shut off. The LCD consists of grid driver element, control circuit and pixel array, in which the said control circuit and grid driver element individually are coupled on the pixel array, moreover, when the LCD is shut on, the control circuit is shut off. The method activates the control circuit to get the control circuit to activate the pixel array to discharge when the LCD is shut off, then eliminates the charges remained in the pixel array to avoid the afterimage phenomena when LCD is shut off.

In a display apparatus and a driving method thereof, image data corresponding to plural different positions of a display panel are added to each other, and a sum of the image data of a present frame is compared with a sum of the image data of a previous frame to determine whether an image displayed on the display panel is a still image or not. While a still image is displayed, brightness of the display panel is gradually lowered. Accordingly, the display panel may prevent occurrence of afterimages and deterioration of organic electroluminescent light emitting devices, as well as reduce power consumption.

The disclosure provides a pixel driving circuit, a driving method, and a display device, which are applied to the field of display technology. The pixel driving circuit includes a first switching element, a second switching element, a third switching element, a fourth switching element, a fifth switching element, a sixth switching element, a driving transistor, and a storage capacitor. According to the disclosure, the short-term afterimage problem caused by a hysteresis effect is improved, the display quality is improved, the influence of a threshold voltage of the driving transistor on a driving current is also eliminated and therefore, the uniformity of display luminance of each pixel is ensured.

An afterimage occurring on a liquid crystal display is eliminated at the time of turning off the system power with an inexpensive circuit construction, without the need for reserving a special power supply. The afterimage continues to be displayed for a certain period of time after the turning-off of the power supply, and is eliminated by the load capacitance processed by liquid crystal display elements in a liquid crystal display panel.

The invention discloses a voltage regulation method and a voltage regulation device of a liquid crystal display panel. The method comprises the steps of acquiring the initial reference voltage value of a gamma voltage pair at each gray level according to a voltage-transmittance curve and a gamma standard voltage curve of the liquid crystal display panel, wherein the gamma voltage pair comprises first gamma voltage and second gamma voltage; fixing the first gamma voltage at each gray level, respectively regulating the second gamma voltage at each gray level according to the flicker value of the brightness of the liquid crystal display panel and the initial reference voltage value of the second gamma voltage at each gray level, and acquiring the regulated voltage value of the second gamma voltage; and respectively conducting equal-proportion synchronous regulation to the initial reference voltage value of the first gamma voltage at each gray level and the regulated voltage value of the second gamma voltage, so as to adjust the brightness corresponding to a gray level to be the same as the brightness corresponding to the same gray level in the gamma standard voltage curve. By adopting the voltage regulation method and the voltage regulation device of the liquid crystal display panel, the afterimage phenomenon of the liquid crystal display panel is improved.

An apparatus, a shifter register unit, a liquid crystal display device and a method for eliminating afterimage are provided herein, which merely utilize a high voltage source delay discharging phenomenon oriented from a powered-off power device to lead any two of a plurality of existing signal sources employed by the shift register unit to reach a high level used for controlling of charge and discharge of a discharge switching unit corresponding to a pixel unit. Therefore, a power-off afterimage problem could be improved and a signal reset function for power-on also can be achieved.

The present invention aims to insert a black screen in one frame period to alleviate moving image blur due to overlap recognition of a current frame image and an afterimage of the previous frame and improve the image quality of the moving image, and to set a black insertion rate with respect to one frame period to a value suited for each usage state. An enable signal (VOE) to each gate driver is independently controlled, and a start pulse (VSP) input to write a black signal is performed at an arbitrary timing within one frame period with respect to the gate driver to insert a black image within one frame period.

A display device which can suppress an afterimage phenomenon from occurring includes a first plate including a pixel electrode which is disposed in a transmitting region and a first impurity adsorption electrode which is disposed in a light-shielding region and is separated from the pixel electrode, a second plate facing the first plate and including a second impurity adsorption electrode which is disposed in the light-shielding region to face the first impurity adsorption electrode, and an intermediate layer interposed between the first plate and the second plate.

Provided are a display substrate capable of improving an afterimage phenomenon and a liquid crystal display (LCD) including the display substrate. The display substrate includes a substrate, a low-voltage pad which is formed on the substrate, a ground pad which is formed on the substrate and to which a ground voltage is applied, and a discharge pattern which is formed on the substrate and connects the low-voltage pad and the ground pad.

The invention relates to a TEF-LCD control method which comprises the following steps of exerting a first DC common voltage signal to a common electrode of a substrate of a colored filter, exerting a second square wave AC common voltage signal to a common electrode line of a substrate of an array, a rising edge of the second common voltage signal corresponds to a falling edge of a grid voltage signal, the sum of the holding time of the maximum value and the minimum value of the second common voltage is equal to a cycle of the grid voltage signal, and the holding time of the minimum value of the second common voltage is within the holding time of a grid threshold voltage. At the time when TFT is shut off, the control method can be used to compensate the feedback voltage deltaVP existing in the prior art through the voltage change of the second common voltage so that a pixel voltage VP can not produce the feedback voltage deltaVP, picture flashing and the residual direct voltage are removed, the poor incidental image is improved, the technology for adjusting the common voltage is saved, the yield is improved and poor products due to unadjustable common voltage and so on are avoided.

The device includes: a write-gray scale level determining means (2), (3) for determining the write-gray scale level data for input image data that compensates the optical response characteristic of a liquid crystal display panel (4), in accordance with, at least, the combination of the gray scale level transitions from a previous vertical period to a current vertical display period; and an achievable gray scale level determining means (5), (6) for generating the achievable gray scale level data for input image data after a lapse of one vertical display period of the liquid crystal display panel, in accordance with, at least, the combination of the gray scale level transitions from one vertical display period to the next. The write-gray scale level determining means (2), (3) determines the write-gray scale level data to be supplied to the liquid crystal display panel (4), based on the achievable gray scale level data of the liquid crystal display panel (4), corresponding to the input image data at the previous vertical display period, output from the achievable gray scale level determining means (5), (6) and the input image data at the current vertical display period. In this way, it is possible to correctly inhibit generation of afterimages and present correct display of half gray scales even for motion pictures containing any kind of gray scale level transition, by implementing overshoot drive of the liquid crystal display panel using actual achievable gray scale levels within the one vertical display period, even if any type of gray scale level transition occurs from one vertical display period to the next.

The liquid crystal display device includes pixel electrodes; a common electrode; a plurality of data lines and a plurality of gate lines intersecting each other; a plurality of switchers for the pixel electrodes for supplying signals from the data lines to the pixel electrodes; a gate line driver for scanning the gate lines; a data line driver for driving the data lines in accordance with the gradation to be displayed; and a controller for controlling the gate line driver and the data line driver. The controller includes a signal absence detector for detecting that no signal has been input to the liquid crystal display device. The controller outputs a signal to the gate line driver to make all the gate lines active for a predetermined time after the signal absence detector detects that no signal has been input. The controller outputs a signal to the data line driver to supply an electric potential, applied to the common electrode, to all the data lines for the predetermined time.

An image displayer having a function of automatically eliminating an afterimage, comprises a signal processing unit for processing signals inputted from an external device and outputting video signals and audio signals to a display and a speaker, respectively, a detecting sensor for detecting whether there exists a user within a predetermined range from the display when a still picture corresponding to video signals of an identical pattern outputted from the signal processing unit is displayed on the display beyond a pre-set time, and a control unit for controlling the signal processing unit to display an afterimage-eliminating picture on the display when a signal corresponding to the non-presence of the user within the predetermined range is outputted from the detecting sensor, thereby eliminating the afterimage caused due to the still picture. Accordingly, the afterimage eliminating function is automatically performed without manipulation input of the user.

An automatic focusing system comprises at least one micromirror array lens, an image sensor, and a signal processor. The micromirror array lens images an object and focuses the image on the image sensor. The image sensor receives the light and converts the photo energy of the light to electrical energy in the form of an electrical signal. The image sensor sends the electrical signal, which carries image data concerning the object, to the signal processor. The signal processor receives the electrical signal, compares the image quality of the image data to its focus criteria, and generates a control signal, which it sends to the micromirror array lens to adjust the focal length of the micromirror array lens. This iterative process is continued until the quality of the image data meets the focus criteria, and the process is completed within the afterimage speed of the human eye.

An automatic focusing system comprises at least one micromirror array lens, an image sensor, and a signal processor. The micromirror array lens images an object and focuses the image on the image sensor. The image sensor receives the light and converts the photo energy of the light to electrical energy in the form of an electrical signal. The image sensor sends the electrical signal, which carries image data concerning the object, to the signal processor. The signal processor receives the electrical signal, compares the image quality of the image data to its focus criteria, and generates a control signal, which it sends to the micromirror array lens to adjust the focal length of the micromirror array lens. This iterative process is continued until the quality of the image data meets the focus criteria, and the process is completed within the afterimage speed of the human eye.

The invention discloses a circuit for eliminating a shutdown afterimage of a liquid crystal display device and the liquid crystal display device using same. The circuit comprises a controller, a voltage detecting circuit, a voltage output circuit, a power supply management chip, a gate electrode driving chip and a TFT. The drain electrode of the TFT is connected with the input end of the voltage detecting circuit. The output end of the voltage detecting circuit is connected with the input end of the controller. The output end of the controller is connected with the first input end of the voltage output circuit. The second input end of the voltage output circuit is connected with the power supply management chip. The output end of the voltage output circuit is connected with the second input end of the gate electrode driving chip. The power supply management chip is connected with the first input end of the gate electrode driving chip. The output end of the gate electrode driving chip is connected with the gate electrode of the TFT. The voltage detecting circuit detects the drain electrode voltage of the TFT and outputs different detecting signals to the controller according to the magnitude of the drain electrode voltage. The controller makes the voltage output circuit generate different gate electrode starting voltages. Furthermore when the liquid crystal display device is shut down, the controller outputs the gate electrode starting voltage to the gate electrode of the TFT.

The invention relates to a liquid crystal display device which comprises an array base plate, a colored filter base plate arranged relatively to the array base plate, a metal layer with an earth potential, and a black matrix layer positioned at one side of the colored filter base plate, wherein the array base plate and the colored filter base plate are connected by a sealant; the metal layer with an earth potential is distributed at one side of the array base plate and a conducting layer is formed on the metal layer with an earth potential; and a conducting component is formed between the conducting layer and the black matrix layer and is connected with the conducting layer and the black matrix layer. The liquid crystal display device can prevent an opening part from forming a longitudinal direct current biasing electric field and ensure enough and stable earth potential on a black matrix, thereby eliminating an afterimage in an image and improving the quality of the liquid crystal display device.

The invention discloses a method and a device for rating an afterimage, relates to the technical field of display, and aims to solve the problem of the prior art that the afterimage is accurately rated by human eyes. The method comprises the following: obtaining initial brightness and target brightness of reference images displayed on a displayer before and after an afterimage test; working out adifference between the target brightness and the initial brightness; and accurately rating the afterimage on the displayer according to the difference.