Patent application number | Description | Published |
20100238156 | DISPLAY DEVICE AND METHOD FOR DRIVING DISPLAY DEVICE - A display device, in at least one embodiment, includes: a gate driver including a plurality of shift register stages each provided so as to correspond to each row, the gate driver outputting a gate signal for turning on switching elements in the each row; and a source driver outputting a data signal in accordance with an image to be displayed. For a row (first row) located at an outermost position from which scanning by use of the gate signal starts, a dummy line is provided. The dummy line is driven by a gate start pulse inputted into a shift register in the first row. | 09-23-2010 |
20100321372 | DISPLAY DEVICE AND METHOD FOR DRIVING DISPLAY - Each stage of first and second shift registers outputs a scan pulse by transferring a clock pulse of a clock signal supplied through a first clock input terminal. A first transistor is provided in at least one embodiment so as to connect and disconnect a scan signal line corresponding to the individual stage to and from a low-level power source of the scan pulse, and the first transistor has a gate that receives a clock signal supplied through a second clock input terminal. Two clock signals supplied to the first shift register and two clock signals supplied to the second shift register are different from each other in timings of their clock pulses. This realizes a display device capable of curbing the phenomenon in which a threshold voltage of a sink-down transistor is shifted, while sinking the gate line voltage down. | 12-23-2010 |
20100325466 | DISPLAY PANEL DRIVE CIRCUIT, LIQUID CRYSTAL DISPLAY DEVICE, AND METHOD FOR DRIVING DISPLAY PANEL - In at least one embodiment, a display panel drive circuit including a shift register including unit circuits connected in cascade, each of the unit circuits outputting a signal line selection signal, is configured such that: each of the unit circuits receives a clock signal and either a signal line selection signal outputted from another-stage unit circuit or a start pulse signal; and the clock signal has a rising portion which is caused by activation of the clock signal and which is sloped or a falling portion which is caused by activation of the clock signal and which is sloped. With the configuration, it is possible to realize a display panel drive circuit and a display panel driving method each of which hardly causes a poor gate-on pulse signal (which causes unevenness in electric potential during inactivation, for example. | 12-23-2010 |
20110001732 | SHIFT REGISTER CIRCUIT, DISPLAY DEVICE, AND METHOD FOR DRIVING SHIFT REGISTER CIRCUIT - In at least one embodiment, each of stages connected in cascade includes a first circuit which causes a predetermined section in a corresponding one of the stages to be connected to a low-potential power source, the first circuit being constituted by TFTs, a first type of clock signal being used as a signal which is transferred to an output terminal of each of the stages so as to be outputted as an output signal, a second type of clock signal being used as a signal which drives the first circuit. With the arrangement, it is possible to realize a shift register circuit that is capable of further suppressing a shift phenomenon of a threshold voltage in each of the TFTs. | 01-06-2011 |
20110001752 | DISPLAY PANEL DRIVE CIRCUIT, LIQUID CRYSTAL DISPLAY DEVICE, AND METHOD FOR DRIVING DISPLAY PANEL - A display panel drive circuit including a shift register including unit circuits connected in cascade, each of the unit circuits outputting a signal line selection signal, is so configured that: each of the unit circuits receives a clock signal nd either a signal line selection signal outputted from another-stage unit circuit or a start pulse signal, and the clock signal has a returned portion following an activation portion thereof, the returned portion including a first region that is sloped and a second region that is sloped more steeply than the first region. With the configuration, it is possible to realize a display panel drive circuit and a display panel driving method each of which (i) restrains an occurrence of a poor gate-on pulse signal, (ii) improves a pixel charging rate, and (iii) allows a clock signal to have higher frequency. | 01-06-2011 |
20110018845 | DISPLAY PANEL DRIVING CIRCUIT, LIQUID CRYSTAL DEVICE, SHIFT REGISTER, LIQUID CRYSTAL PANEL, AND DRIVING METHOD OF DISPLAY DEVICE - A display panel drive circuit includes a shift register constructed of unit circuits connected in stages. The unit circuits generate signal line selection signals, respectively, which signal line selection signals are made active for a respective certain period of time to form a respective pulse, and the pulses are outputted successively from respective unit circuits in order of ordinal number starting from a first stage until an end stage. In at least one embodiment, each of the unit circuits receive (i) clock signals generated based on a sync signal received from outside of the display panel drive circuit, (ii) a start pulse signal generated based on the sync signal, or a signal line selection signal generated in a stage different from its own stage, and (iii) a clear signal. The clear signal is made active in a case where anomalousness is included in the sync signal, and no pulse is outputted from the shift register until a subsequent vertical scanning period starts. This configuration achieves a display panel drive circuit which prevents display disorder or holds down increase in load given to a power source, each of which occurs in a case where anomalousness is included in the sync signal. | 01-27-2011 |
20110234565 | SHIFT REGISTER CIRCUIT, DISPLAY DEVICE, AND METHOD FOR DRIVING SHIFT REGISTER CIRCUIT - In at least one embodiment, under a non-load condition of a first supply line for a first clock signal and a second supply line for a second clock signal, a fall time of a clock pulse of the first clock signal, which is supplied to the first supply line, is longer than that of the second clock signal, which is supplied to the second supply line. | 09-29-2011 |
20110298774 | DISPLAY APPARATUS - An LUT fixedly stores correction values to compensate for a pull-in voltage in pixels in a liquid crystal panel. In at least one example embodiment, the display control unit outputs an input video signal Xa, a video signal Xp of a previous frame read from a frame memory, and a pixel polarity indicating a polarity of a pixel applied voltage on the pixel basis, and outputs a correction value read from the LUT to a data line driving circuit as a video signal Xb after correction. The data line driving circuit performs alternate current driving, based on the video signal Xb after correction. The LUT stores different correction values between when a positive polarity voltage is applied and when a negative polarity voltage is applied, for at least a part of combinations of values of the input video signal Xa and the video signal Xp of the previous frame. This can reduce a difference in response speed between when the positive polarity voltage is applied and when the negative polarity voltage is applied, thereby enhancing display quality. | 12-08-2011 |
20120120044 | LIQUID CRYSTAL DISPLAY DEVICE AND METHOD FOR DRIVING THE SAME - Provided is a liquid crystal display device performing a precharge and having a function of switching an order for selecting scanning lines, in which such as flicker and burn-in can be prevented from being produced. A scanning line drive circuit selects scanning lines either in ascending order or in descending order based on an order of arrangement according to a shift direction signal, and causes selection periods of the scanning lines to be partially overlapped for a precharge. A data line drive circuit applies voltages of different polarities to data lines by frame and by data line. A common voltage generating circuit generates two types of voltages whose levels are independently adjustable, selects one of the two voltages according to a scan selection signal and applies the selected voltage to a common electrode of a liquid crystal panel. As the common voltage generating circuit, a D/A converter may be used. | 05-17-2012 |
Patent application number | Description | Published |
20100194726 | Display device and display method - In the display device and the display method of the present invention, a scanning signal line driving circuit controls falls of a scanning signal line, so as to make level shifts occurring to pixel potentials substantially uniform throughout display plane, the level shifts being caused by parasitic capacitances which parasitically exist in scanning signal lines. Fall waveforms of the scanning signal change at a change rate Sx which is a change quantity per unit time, and by desirably setting the change rate Sx, a change rate Sx | 08-05-2010 |
20120001877 | Display device and display method - In the display device and the display method of the present invention, a scanning signal line driving circuit controls falls of a scanning signal line, so as to make level shifts occurring to pixel potentials substantially uniform throughout display plane, the level shifts being caused by parasitic capacitances which parasitically exist in scanning signal lines. Fall waveforms of the scanning signal change at a change rate Sx which is a change quantity per unit time, and by desirably setting the change rate Sx, a change rate Sxl in the vicinity of an input-side end of the scanning signal line and a change rate SxN in the vicinity of the other end thereof are substantially equal to each other, not being influenced by signal delay transmission characteristic which the scanning signal line possesses, like scanning signal line waveforms Vg(1, j) and Vg(N, j). | 01-05-2012 |
Patent application number | Description | Published |
20090040243 | Display Device and Method for Driving Display Member - In one embodiment of the present invention, in an even-numbered signal line group, the arrangement sequence of the first and second signal lines is reversed between in a display area and in a non-display area, and the same goes for the arrangement sequence of the third and fourth signal lines. The ends of the first to sixteenth signal lines in the non-display area are connected to the first to sixteenth individual drivers, respectively. An odd-numbered individual driver and an even-numbered individual driver each output a corresponding one of drive signals of opposite polarity. Thus, the polarities of subpixels of the same color arranged in a first direction D | 02-12-2009 |
20090046112 | Liquid Crystal Panel Driving Device, Liquid Crystal Panel driving Method, Liquid Crystal Display Device - In one embodiment of the present invention, a liquid crystal panel driving device for AC-driving a liquid crystal panel with first and second polarities includes an output tone generating section for generating an output tone corresponding to an input tone. With respect to the same input tone, the output tone generating section generates a first output tone when driving the liquid crystal panel with a first polarity, and generates a second output tone when driving the liquid crystal panel with a second polarity. The first and second output tones are determined based on a characteristic of the input tone and the center of amplitude of a voltage to be outputted in response to the input tone in AC driving. This allows providing a liquid crystal panel driving device capable of easily performing Ω correction with respect to each liquid crystal panel. | 02-19-2009 |
20090115910 | Video signal processing method, video signal processing apparatus, and display apparatus - In one embodiment of the present invention, a video signal processing method is disclosed wherein video correction data is read from a ROM and written into an LUT, and the video correction data written in the LUT is used to perform data correction of an externally inputted video signal. The video correction data written in the LUT is updated during the horizontal blanking interval of the video signal. | 05-07-2009 |
Patent application number | Description | Published |
20110134090 | SHIFT REGISTER CIRCUIT AND DISPLAY DEVICE, AND METHOD FOR DRIVING SHIFT REGISTER CIRCUIT - A control section prepares a control signal and supplies the control signal to a control terminal of a first switching element, the control signal causing the first switching element to turn on in accordance with a non-active voltage level of a storage node and an active voltage level of a second clock signal which active voltage level is obtained in a period in which the second clock signal is active. | 06-09-2011 |
20120026215 | DISPLAY DEVICE AND DRIVE METHOD FOR DISPLAY DEVICES - A display device supplies, during a vertical blanking interval, a data signal for a gray display to each data signal line so as to cause the each data signal line to retain the data signal for the gray display. In at least one example embodiment, the data signal for the gray display has a polarity identical to a polarity of a data signal supplied immediately before the vertical blanking interval. This achieves a display device and a method for driving a display device in each of which, while an AC driving is carried out so that (i) data signals having opposite polarities are written to respective picture elements adjacent to each other within the same row, (ii) a polarity of a data signal supplied to each data signal line is reversed at least once during one vertical period, and (iii) a polarity of a data signal written to each picture element is reversed for every predetermined period, an effective value of a voltage applied to liquid crystal is less likely to differ between a picture element to which a data signal having a positive polarity is written and a picture element to which a data signal having a negative polarity is written. | 02-02-2012 |
20120194489 | SHIFT REGISTER, SCANNING SIGNAL LINE DRIVE CIRCUIT PROVIDED WITH SAME, AND DISPLAY DEVICE - Each stage that constitutes a shift register includes an output-control thin-film transistor for increasing a potential of a scanning signal based on a first clock (CKA), two thin-film transistors for increasing a potential of a first node connected to a gate terminal of the output-control thin-film transistor, based on a scanning signal outputted from a pre-stage/a latter stage, and two thin-film transistors for decreasing a potential of the first node, based on a scanning signal outputted from a third stage after/a third stage before a stage concerned. The shift register operates based on four-phase clock signals, including two-phase clock signals that are provided to odd-order stages and two-phase clock signals that are provided to even-order stages, of which phases are shifted by 90 degrees from each other. | 08-02-2012 |
20120200544 | SHIFT REGISTER, SCANNING SIGNAL LINE DRIVE CIRCUIT PROVIDED WITH SAME, AND DISPLAY DEVICE - In a shift register that operates based on four-phase clock signals, including two-phase clock signals that are provided to odd-order stages and two-phase clock signals that are provided to even-order stages, of which phases are shifted by 90 degrees from each other, a potential of a first clock appears as a potential of a scanning signal, when a potential of a first node is at a high level, in each stage. In this configuration, the potential of the first node included in each stage is set to a high level based on a pulse of a scanning signal outputted from a pre-stage, and is set to a low level based on a pulse of a scanning signal outputted from a third stage after a stage concerned. | 08-09-2012 |
20120218245 | LIQUID CRYSTAL DISPLAY DEVICE AND METHOD OF DRIVING THE SAME - A liquid crystal display device includes a monolithic gate driver capable of quickly eliminating residual charges within pixel formation portions when the power-supply is turned off. Each of bistable circuits that constitute a shift register within a gate driver is provided with a thin-film transistor having a drain terminal connected to a gate bus line, a source terminal connected to a reference potential line for transmitting a reference potential, and a gate terminal to which a clock signal for operating the shift register is supplied. When the external supply of power-supply voltage is cut off, the clock signal is set to high level to turn the thin-film transistor to the ON state, and the level of the reference potential is increased from a gate-OFF potential to a gate-ON potential. | 08-30-2012 |
20120223926 | POWER-SUPPLY CIRCUIT AND LIQUID CRYSTAL DISPLAY DEVICE PROVIDED THEREWITH - An object is to provide at low cost a Power-supply circuit that can generate positive and negative analog power source voltages of which absolute values of voltage values are equal. | 09-06-2012 |
20130027104 | LEVEL SHIFT CIRCUIT AND DISPLAY DEVICE PROVIDED WITH THE SAME - An object of the present invention is to provide a level shift IC with a reduced number of input signals over the conventional case. A level shift IC includes an amplitude converting unit including four level shifters; and a different-phase signal generating unit at a stage previous to the amplitude converting unit, including delay circuits. The different-phase signal generating unit generates, by the delay circuits, first and second delayed input signals from first and second input signals of different phases. Therefore, four input signals of different phases are obtained, and the amplitude converting unit increases the amplitudes of the input signals by the amplitude converting unit and thereby generates first to fourth output signals with different phases and increased amplitudes. | 01-31-2013 |
20130057598 | DISPLAY PANEL, DISPLAY DEVICE, AND METHOD OF DRIVING THE SAME - The present invention provides a display panel having decreased cost and current consumption by decreasing the number of data signal lines from the conventional number, a display device including the display panel, and a method of driving the display device. | 03-07-2013 |
20140191935 | LIQUID CRYSTAL DISPLAY DEVICE AND DRIVING METHOD THEREOF - The invention provides a liquid crystal display device that includes an IGZO-GDM which can quickly remove a residual charge in a panel when the power supply is turned off, and a driving method of the liquid crystal display device. Each bistable circuit that configures a shift register includes a thin film transistor TI for increasing a potential of an output terminal based on a first clock, a region netA connected to a gate terminal of the thin film transistor TI, a thin film transistor TC for lowering a potential of the region netA, and a region netB connected to a gate terminal of the thin film transistor TC. In such a configuration, a power supply off sequence includes a display off sequence and a gate off sequence. The gate off sequence includes at least a gate-bus-line discharge step (t | 07-10-2014 |
20140306948 | LIQUID CRYSTAL DISPLAY DEVICE AND DRIVE METHOD FOR SAME - Provided are: a liquid crystal display device capable of rapidly removing residual electric charges in a panel when a power supply is turned off, and in particular, suitable for a case where IGZO-GDM is adopted; and a driving method of the liquid crystal display device. | 10-16-2014 |