WO2004063801A1 - 液晶表示装置 - Google Patents
液晶表示装置 Download PDFInfo
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- WO2004063801A1 WO2004063801A1 PCT/JP2004/000045 JP2004000045W WO2004063801A1 WO 2004063801 A1 WO2004063801 A1 WO 2004063801A1 JP 2004000045 W JP2004000045 W JP 2004000045W WO 2004063801 A1 WO2004063801 A1 WO 2004063801A1
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- liquid crystal
- voltage
- pixel
- driver
- display device
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/139—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/139—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
- G02F1/1393—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent the birefringence of the liquid crystal being electrically controlled, e.g. ECB-, DAP-, HAN-, PI-LC cells
- G02F1/1395—Optically compensated birefringence [OCB]- cells or PI- cells
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/133707—Structures for producing distorted electric fields, e.g. bumps, protrusions, recesses, slits in pixel electrodes
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/04—Structural and physical details of display devices
- G09G2300/0421—Structural details of the set of electrodes
- G09G2300/0426—Layout of electrodes and connections
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/04—Structural and physical details of display devices
- G09G2300/0469—Details of the physics of pixel operation
- G09G2300/0478—Details of the physics of pixel operation related to liquid crystal pixels
- G09G2300/0482—Use of memory effects in nematic liquid crystals
- G09G2300/0486—Cholesteric liquid crystals, including chiral-nematic liquid crystals, with transitions between focal conic, planar, and homeotropic states
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/04—Structural and physical details of display devices
- G09G2300/0469—Details of the physics of pixel operation
- G09G2300/0478—Details of the physics of pixel operation related to liquid crystal pixels
- G09G2300/0491—Use of a bi-refringent liquid crystal, optically controlled bi-refringence [OCB] with bend and splay states, or electrically controlled bi-refringence [ECB] for controlling the color
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0243—Details of the generation of driving signals
- G09G2310/0245—Clearing or presetting the whole screen independently of waveforms, e.g. on power-on
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/06—Details of flat display driving waveforms
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0257—Reduction of after-image effects
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
Definitions
- the present invention relates to a liquid crystal display device, a stopping method thereof, a program, and a recording medium.
- the problem was solved by turning on and off all the gates of the TFT at the time of power supply ⁇ F F, and ending the operation after removing the electric charge.
- the alignment of OCB mode liquid crystal includes splay alignment and bend alignment.
- the spray alignment is the liquid crystal alignment when no voltage is applied to the OCB mode liquid crystal (non-display state), and the bend alignment is the splay alignment OCB.
- the antagonistic voltage Vc is a voltage at which the energy of the splay orientation and the energy of the bend orientation antagonize, and the splay orientation becomes stable below this voltage.
- the process proceeds in the following steps.
- the 180 ° twist is a liquid crystal alignment in which the alignment direction of liquid crystal molecules is twisted between the upper substrate and the lower substrate, and the twist angle is 180 °.
- This alignment state is recognized as, for example, a bright yellow as a transmission color.
- This twist alignment state may be referred to as a second splay alignment.
- the splay alignment is twisted. Since the liquid crystal is more stable than the strike alignment state, the splay alignment region remaining on the display surface and the splay alignment region accidentally generated with foreign substances or projections on the display surface as nuclei grow, and finally the entire display surface. Are splayed and stabilized.
- the splay orientation is, for example, blue in transmission color.
- the problem is that the twisted orientation (yellow) and the splay orientation (blue) after the power supply OFF appear unevenly or unevenly on the display surface depending on the display pattern. It is. .
- Fig. 19 is a time chart showing the operation of a conventional liquid crystal display device using OCB mode liquid crystal when the power is turned off (hereinafter referred to as a power off sequence).
- a power off sequence showing the operation of a conventional liquid crystal display device using OCB mode liquid crystal when the power is turned off.
- the applied voltage to each part of the liquid crystal layer is different depending on the image display, so that when the power is turned off, the display screen shifts from the bend alignment to the splay alignment as soon as possible.
- a state where the alignment state between the splay alignment state and the splay alignment state (hereinafter, referred to as a second splay alignment state) occurs.
- FIG. 20 is a time chart showing the operation of the liquid crystal display device using the OCB mode liquid crystal when the power is ON. Assuming that the power supply is turned ON at time t 0, a factor that disturbs the splay alignment due to sneaking from various paths of the circuit is added to the liquid crystal layer immediately after time t 0. In order to correct such a splay alignment disorder, 0 V is applied to the liquid crystal layer during the period from time t0 to t1. After the liquid crystal layer has a uniform splay alignment, a transition voltage for driving the transition of the liquid crystal layer is applied from time t1 to time t2. After the transition drive is completed at time t2, a voltage for displaying an image on the display surface is applied to the liquid crystal layer.
- the present invention has been made in consideration of the above problems, and can suppress occurrence of unevenness of a display screen after power is turned off in a liquid crystal display device using an OCB mode liquid crystal. It is an object to provide a liquid crystal panel driving device, a driving method, a program thereof, and a recording medium.
- a liquid crystal drive power supply for supplying power to the driver
- the driver When an off signal is output from the switch, the driver applies a predetermined voltage that can be applied to each pixel of the liquid crystal layer for a predetermined time, and after a lapse of the predetermined time, the driver supplies a voltage from the liquid crystal driving power supply to the driver.
- a liquid crystal display device that stops power supply.
- the liquid crystal layer is provided with: a pixel electrode to which an individual voltage is applied for each pixel; and a counter electrode disposed to face each pixel electrode.
- the voltage is a voltage equal to or higher than the critical voltage of the OCB mode liquid crystal, and the application of the voltage to each pixel is performed between the pixel electrode and the counter electrode. It is.
- a third invention is the liquid crystal display device according to the second invention, wherein the predetermined voltage is a voltage at which substantially black is displayed on a display surface.
- the driver when an OFF signal is output from the switch, the driver applies a voltage to each pixel of the liquid crystal layer so that substantially black can be displayed on the display surface. To the liquid crystal drive voltage.
- a liquid crystal display device according to a second aspect of the present invention, wherein the supply of the heat source from the source to the driver is stopped.
- the driver when an off signal is output from the switch, the driver displays substantially black on the display surface instead of applying a predetermined voltage to each pixel of the liquid crystal layer.
- a liquid crystal display device according to a second aspect of the present invention, wherein a voltage higher than a voltage to be applied is applied for a predetermined time, and after a lapse of the predetermined time, supply of power from the liquid crystal driving power supply to the driver is stopped.
- the driver when the off signal is not output from the switch, the driver does not apply a predetermined voltage to each pixel of the liquid crystal layer, but displays a substantially black display on the display surface. A voltage higher than the voltage to be applied is applied for a predetermined time, and after the lapse of the predetermined time, a voltage for substantially displaying white on the display surface is applied. Thereafter, the supply of power from the liquid crystal drive power supply to the driver is stopped. This is the liquid crystal display device of the second invention of the present invention.
- a seventh aspect of the present invention after the lapse of the predetermined time, instead of applying a voltage at which substantially white is displayed on the display surface, applying a voltage at which substantially black is displayed on the display surface, 1 is a liquid crystal display device of the present invention.
- the driver when an off signal is output from the switch, the driver applies substantially black to a display surface instead of applying a predetermined voltage to each pixel of each layer of the liquid crystal. Applying a voltage higher than the voltage and not more than the maximum voltage that can be applied to the liquid crystal layer for a predetermined time; applying a voltage at which substantially black is displayed on a display surface after the predetermined time has elapsed; Is applied from the driving power source to the driver after applying the voltage at which substantially white is displayed on the display surface, and then applying the voltage at which substantially white is displayed.
- a liquid crystal display device according to a second aspect of the present invention, in which the supply of power is stopped.
- the voltage at which substantially white is displayed on the display surface includes a voltage between a counter electrode and a pixel electrode, and a voltage between a good line and a pixel electrode. Or a voltage between the pixel electrode and an electrode other than the pixel electrode is substantially zero.
- the voltage at which substantially white is displayed on the display surface is a voltage between a counter electrode and a pixel electrode, and a voltage between a gate line and a pixel electrode or a pixel electrode.
- the voltage at which substantially white is displayed on the display surface is a voltage between a counter electrode and a pixel electrode, and a voltage between a gate line and a pixel electrode or a pixel electrode.
- a thirteenth aspect of the present invention further comprises a backlight connected to the liquid crystal driving power supply for irradiating the liquid crystal layer,
- a fifteenth aspect of the present invention further comprises a backlight connected to the liquid crystal driving power supply, for irradiating the liquid crystal layer,
- a fifteenth aspect of the present invention further includes a backlight connected to the liquid crystal driving power supply, and configured to irradiate the liquid crystal layer, When an OFF signal is output from the switch, the irradiation from the backlight is stopped at the same time as or immediately before a predetermined voltage is applied from the driver to each pixel of the liquid crystal layer.
- Liquid crystal display device Liquid crystal display device.
- a sixteenth aspect of the present invention further includes a pack light connected to the liquid crystal driving power supply, for irradiating the liquid crystal layer,
- the off signal is output from the switch, the irradiation from the backlight is stopped at the same time as or before the predetermined voltage is applied from the driver to each pixel of the liquid crystal layer.
- Liquid crystal display device When the off signal is output from the switch, the irradiation from the backlight is stopped at the same time as or before the predetermined voltage is applied from the driver to each pixel of the liquid crystal layer. Liquid crystal display device.
- a seventeenth aspect of the present invention is the liquid crystal display device according to any one of the second to sixteenth aspects, wherein the voltage applied to each pixel is an alternating voltage.
- the eighteenth invention is the liquid crystal display device according to any one of the second to sixteenth inventions, wherein the predetermined voltage is a uniform voltage for each of the pixels.
- a nineteenth invention is the liquid crystal display device according to the seventeenth invention, wherein the predetermined voltage is a uniform voltage for each of the pixels.
- a pixel electrode connected to the driver and supplied with a pixel voltage is connected to the driver, and a voltage different from the pixel voltage is supplied to the liquid crystal layer.
- the driver When an off signal is output from the switch, the driver generates an electric field between the pixel electrode and the specific electrode in a direction different from the alignment direction of the OCB mode liquid crystal, and a predetermined time elapses.
- a liquid crystal display device wherein the supply of power from the liquid crystal driving power supply to the driver is stopped.
- the outline of the pixel electrode is not perpendicular to the alignment direction of the OCB mode liquid crystal, and a part of the liquid crystal in the alignment direction is formed in a pixel.
- a first portion for generating an electric field in a direction of twisting in one direction, and a second portion for generating an electric field in a direction of twisting another part of the liquid crystal in the alignment direction in the other direction. 20 is a liquid crystal display device of the present invention.
- the first part and the second part are substantially parallel to an alignment direction of the OCB mode liquid crystal, and the first part and the second part A liquid crystal display device according to the twenty-first aspect of the present invention, which is formed alternately and continuously. -.
- the liquid crystal layer further includes a counter electrode disposed to face each of the pixel electrodes,
- the driver When an off signal is output from the switch, the driver applies a voltage that causes the display surface to display substantially white between each of the pixel electrodes and the counter electrode of the liquid crystal layer.
- a twenty-second liquid crystal display device according to the present invention, wherein the supply of power from a liquid crystal driving power source to the driver is stopped.
- the driver when an off signal is output from the switch, the driver applies a voltage equal to or higher than a critical voltage of an OCB mode liquid crystal to each pixel of the liquid crystal layer, and a maximum voltage that can be applied to the liquid crystal layer.
- the following predetermined voltage is applied, then a voltage for displaying substantially white on the display surface is applied, and then the supply of power from the liquid crystal driving power supply to the driver is stopped.
- 4 is a liquid crystal display device of the invention.
- the twenty-fifth invention is characterized in that the electric field in a direction different from the orientation direction of the OCB mode liquid crystal is applied simultaneously with or after applying a voltage for displaying white on the display surface, 3 is a liquid crystal display device of the present invention.
- the specific electrode is provided with two pixel electrodes adjacent to each other in the orientation direction of the OCB liquid crystal mode via a dielectric,
- a twenty-second liquid crystal display device comprising: A twenty-seventh aspect of the present invention is the liquid crystal display device according to the twenty-sixth aspect of the present invention, wherein the driver applies voltages of opposite phases to the two pixel electrodes.
- a twenty-eighth aspect of the present invention includes a liquid crystal layer using an OCB mode liquid crystal
- the liquid crystal layer is provided with: a pixel electrode to which an individual pixel voltage is applied for each pixel; and a counter electrode disposed to face each pixel electrode.
- a non-voltage region having no voltage with respect to the counter electrode is formed in a region in the same plane as the pixel electrode, and the size of the non-voltage region is such that the liquid crystal layer is
- the liquid crystal display device has a size capable of maintaining the splay alignment at least partially even in the case of the bend alignment.
- a twentieth aspect of the present invention is the liquid crystal display device according to the twenty-eighth aspect of the present invention, wherein the size of the no-voltage region is 400 ⁇ 2 or more.
- a thirtieth aspect of the present invention provides a step of inputting an off signal to a driver for applying a voltage to a liquid crystal layer using a ⁇ CB mode liquid crystal,
- the driver When the off signal is input, the driver applies a predetermined voltage that can be applied to each pixel of the liquid crystal layer for a predetermined time;
- a method for stopping a liquid crystal display device comprising:
- a thirty-second aspect of the present invention is a recording medium carrying the program of the thirty-first aspect of the present invention, which is a recording medium that can be processed by a computer.
- a liquid crystal panel driving device in a liquid crystal display device using an OCB mode liquid crystal, a liquid crystal panel driving device, a driving method, a program, and a recording medium capable of suppressing the occurrence of unevenness in a display screen after power-off.
- a liquid crystal display device using an OCB mode liquid crystal in which a display surface can quickly shift from bend alignment to splay alignment after power is turned off.
- the program and the recording medium can be provided.
- FIG. 1 is a block diagram showing a configuration of the liquid crystal display device according to the first and second embodiments of the present invention.
- FIG. 2 is a diagram illustrating an operation of the liquid crystal display device according to the first embodiment of the present invention.
- FIG. 3 is a diagram illustrating an operation of the liquid crystal display device according to the second embodiment of the present invention.
- FIG. 4 is a diagram illustrating an operation of the liquid crystal display device according to the third embodiment of the present invention.
- FIG. 5 is a diagram illustrating a planar structure of a liquid crystal layer of the liquid crystal display devices according to Embodiments 1 to 3 of the present invention.
- FIG. 6 is a diagram showing a circuit of a pixel of the liquid crystal display device according to the first to third embodiments of the present invention.
- FIG. 7 is a diagram showing specific data when the liquid crystal display devices according to the first to third embodiments of the present invention are implemented.
- FIG. 9 is a diagram for explaining splay alignment and bend alignment energies according to the present invention and the prior art.
- FIG. 10 is a perspective view showing an electrode structure of a liquid crystal display device according to Embodiment 4 of the present invention.
- FIG. 1i is a diagram illustrating the operation of the liquid crystal display device according to the fourth embodiment of the present invention.
- FIG. 12 is a plan view of an electrode structure for explaining the operation of the liquid crystal display device according to the fourth embodiment of the present invention.
- FIG. 13 is a plan view showing another example of the electrode structure of the liquid crystal display device according to Embodiment 4 of the present invention.
- FIG. 14 is a plan view showing another example of the electrode structure of the liquid crystal display device according to Embodiment 4 of the present invention.
- FIG. 15 is a plan view showing another example of the electrode structure of the liquid crystal display device according to Embodiment 4 of the present invention.
- FIG. 16 is a plan view showing a pixel structure of a liquid crystal display device according to Embodiments 4 and 5 of the present invention.
- FIG. 19 is a diagram showing the operation of a conventional liquid crystal display device.
- FIG. 20 is a diagram showing the operation of a conventional liquid crystal display device.
- FIG. 1 is a block diagram showing a configuration of the liquid crystal display device according to the first embodiment of the present invention.
- a driver 2 which is an example of the driver of the present invention for applying a voltage to the liquid crystal layer 1 is connected.
- the driver 2 is connected with a pack light 5 for irradiating a display surface composed of the liquid crystal layer 1 and a switch 4 for turning on and off the power of the liquid crystal display device of the present invention.
- the driver 2 is connected via a switch 6 to a liquid crystal drive power supply 3 which is an example of a liquid crystal drive power supply of the present invention for supplying power to the driver 2 and the backlight 5.
- FIG. 6 is a circuit diagram showing a configuration of the liquid crystal layer 1.
- the liquid crystal layer 1 has a source line 406, a gate line 407, a pixel transistor 401, and a pixel electrode 406
- the counter electrode 408 and the common electrode capacitance C st are completely arranged.
- the gate line 407 is connected to the gate side of the pixel transistor 401
- the source line 406 is connected to the source side of the pixel transistor 401.
- One side of the pixel electrode 402 and the common electrode capacitance C st is connected to the drain side of the pixel transistor 401.
- the common electrode 409 is connected to the other side of the common electrode capacitance C st.
- a parasitic capacitance C gs exists on the gate side and the source side of the pixel transistor 401, and a parasitic capacitance C gd exists between the gate side and the drain side of the pixel transistor 401.
- a liquid crystal capacitance C 1c exists between the pixel electrode 402 and the counter electrode 408.
- FIG. 5 is a plan view showing the internal structure of the liquid crystal layer 1.
- each pixel electrode 402 is surrounded by a gate line 407, a common electrode 4.09, and a source line 406, respectively.
- the operation of the liquid crystal device according to the present embodiment when the power supply is ON is similar to the operation shown in FIG.
- an operation when the power supply of the liquid crystal device of the present embodiment is turned off will be described.
- the driver 2 ends the video display period 101, simultaneously turns off the backlight 5, and turns off the FF sequence. Start period 102. O.
- the display screen is In this case, the driver 2 applies a constant voltage to the liquid crystal layer 1 for displaying a black gradation on the entire display surface.
- the voltage in the OFF sequence period 102 is constant, the arrangement of the liquid crystal in each part in the liquid crystal layer 1 becomes uniform. This OFF sequence period 102 is preferably continued for 2 seconds or more.
- the driver 2 starts the power supply OFF period 103.
- the dryno 2 opens the switch 6 and cuts off the power supplied from the liquid crystal drive power supply unit 3.
- the voltage applied to the liquid crystal layer 1 becomes 0 V while the arrangement of the liquid crystal in the liquid crystal layer 1 is uniform, so that the OCB mode liquid crystal can uniformly shift from the bend alignment to the splay alignment.
- the liquid crystal display device of the present embodiment after the liquid crystal driving power supply 4 is turned off, no unevenness occurs in the splay alignment portion and the bend alignment portion, and even when external light is strong, No unevenness is seen on the display screen.
- the image is displayed after the power is turned on again. Time is reduced.
- a conventional liquid crystal display device with a second splay alignment if the power is turned on again at room temperature about 3 seconds after the power was turned off, it took about 0.4 seconds until the image was displayed.
- an image is displayed in about 0.2 seconds after the power is turned on again.
- the dry panel 2 displays the entire surface of black gradation on the display surface, but even if the display surface substantially displays black gradation. Good. Further, an intermediate gradation or a white gradation may be displayed. Even in such a case, if the voltage applied to each part of the liquid crystal layer 1 is constant, the arrangement of the liquid crystal in the liquid crystal layer 1 becomes uniform, so that the same effect as above can be obtained, although the degree is different. Obtainable.
- the OFF sequence period 102 when the display surface is displayed in white, depending on the pixel, a portion where the splay alignment remains non-uniformly without shifting to the bend alignment occurs, and the display surface is still a problem.
- Figure 8 (b) shows that when a voltage higher than the critical voltage is applied to the liquid crystal layer '1, the bend alignment is more energetically stable, and a voltage lower than the critical voltage is applied to the liquid crystal layer' 1 '. This indicates that the splay orientation is more energetically stable. Therefore, when a voltage lower than the critical voltage is applied to the liquid crystal layer 1, the liquid crystal layer eventually returns to the splay alignment. Therefore, it is preferable that the voltage applied to the liquid crystal layer 1 during the OFF sequence period 102 be a voltage equal to or higher than the critical voltage in order to eliminate as much as possible the splay alignment remaining unevenly on the display surface. This is because when a voltage higher than the critical voltage is applied, the density of the spray nuclei can be made uniform.
- FIG. 3 shows a timing chart of the power supply OFF sequence of the liquid crystal display device according to the second embodiment of the present invention.
- the configuration of the liquid crystal display device of the present embodiment is the same as the configuration of the liquid crystal display device of the first embodiment, and a description thereof will be omitted. ,
- the driver 2 ends the video display period .201, simultaneously turns off the backlight 5, and starts the ⁇ FF sequence period 202.
- the dry paper 2 applies a voltage to the entire liquid crystal layer 1 that exceeds the voltage of the video display area and is equal to or less than the maximum voltage that can be applied to the liquid crystal layer 1.
- the voltage applied to the liquid crystal layer 1 during the OFF sequence period 202 is preferably 1.5 times or more the voltage for displaying black.
- the OFF sequence period 202 When the voltage in the OFF sequence period 202 is constant and higher than the black display voltage, the arrangement of the liquid crystal in the liquid crystal layer 1 becomes uniform more quickly. In addition, if the voltage applied to the liquid crystal layer 1 is higher than the black display voltage, the bend alignment may occur even if there is a region where the spray direction remains during the bend alignment (for example, a gap region between the electrodes). After the end of the OFF sequence period 202, the splay alignment can be more uniformly changed. In the present embodiment, when the applied voltage is about 1.5 times the black display voltage, for example, the OFF sequence period 202 is preferably 100 msec or more.
- the liquid crystal layer 1 can be shifted from the bend alignment to the uniform splay alignment. It is possible to shift to a uniform splay alignment faster after turning off the power supply than in the case. Therefore, for example, at room temperature, even if the power is turned on again within 5 seconds after the lapse of 10 Omse.c after the power is turned off, the second splay orientation does not exist, so the power is turned on again after the power is turned off. Even if the time required to perform the operation is short, the time until an image is displayed is reduced as in the liquid crystal display device of the first embodiment.
- the voltage applied to the liquid crystal layer 1 is preferably 1.5 times or more of the black display voltage, but if it exceeds the black display voltage, it is 1.5 times. Even if the voltage is lower than the above, the same effect as described above can be obtained to some extent.
- various voltages for displaying a video on the display surface are applied from the driver 2 to the liquid crystal layer 1.
- the applied voltage to the liquid crystal layer 1 differs in the liquid crystal layer region depending on the displayed video display.
- the liquid crystal arrangement is not uniform.
- the driver 2 ends the video display period 301, turns off the pack light 5 at the same time, and starts the OFF sequence periods 302, 303, and 304.
- the driver 2 applies a voltage to the entire liquid crystal layer 1 that exceeds the voltage of the video display area and is equal to or less than the maximum voltage that can be applied to the liquid crystal layer 1.
- the voltage applied to the liquid crystal layer 1 during the OFF sequence period 302 is preferably at least 1.5 times the voltage for displaying black.
- the driver 2 applies an alternating voltage to the liquid crystal layer 1. That is, for example, as shown in FIG. 4, in the first half and the second half of the OFF sequence period 302, the voltages applied between the pixel electrode 402 and the counter electrode 408 are equal in magnitude and opposite in direction. Are applied alternately.
- the alternating voltage to the liquid crystal layer 1 in this manner, the uneven distribution of liquid crystal ions can be prevented. As a result, it is possible to prevent the fritting force in the liquid crystal layer 1 and to reduce the shift of the white display, thereby shortening the time until the splay.
- the OFF sequence period 302 is preferably 100 msec or more.
- the driver 2 starts the OFF sequence period 303.
- the driver 2 applies, to the liquid crystal layer 1, an alternating voltage for displaying a black gradation on the entire display surface during the OFF sequence period 303.
- the black display voltage is applied for 100 ms e or more during the OFF sequence period 303.
- the driver 2 After the end of the OFF sequence period 303, the driver 2 starts the OFF sequence period 304.
- the driver 2 applies a voltage to the liquid crystal layer 1 for displaying a white gradation on the entire display surface in the OFF sequence period 304. That is, the driver 2 sets the potential difference between the counter electrode 408 and the pixel electrode 402 to zero. Then, the driver 2 is connected to the potential difference between the gate line 407 and the pixel electrode 402 or the common electrode 409 (electrodes other than the pixel electrode) in order to promote the transition to the splay alignment. Control is performed so that at least one of the potential differences between the pixel electrode 402 and the pixel electrode 402 becomes zero.
- the voltage applied to the liquid crystal layer 1 becomes 0 V with the liquid crystal layer 1 being arranged uniformly, so that the OCB mode liquid crystal can uniformly transition from the bend alignment to the splay alignment.
- Reference numerals 503 and 504 shown in FIG. 5 indicate the progress of such a transition to the splay alignment (reverse transition). That is, at the start of the power-off period 305, there is no potential difference between the pixel electrode 402 and the common electrode 409, so the pixel is placed on the pixel electrode 402 from the common electrode 409 side. A reverse transition 504 occurs toward the center of the electrode 402.
- the alternating voltage is applied in OFF sequence periods 302 and 303, but a constant voltage may be applied. Also in this case, the effect similar to the above can be obtained in that the transition to the splay alignment is accelerated.
- the OFF sequence period 302 after the end of the video display period 301, the OFF sequence period 302, the OFF sequence period 3
- the power-off period 305 starts after the period 304 ends in this order, but the OFF sequence period 303 starts after the video display period 301 ends, and the OFF sequence ends after the OFF sequence period 303 ends.
- the power supply OFF period 305 may be reached. In such a case, the same effect as above can be obtained.
- the OFF sequence period 302 may be started after the video display period 301 ends, and the power supply OFF period 305 may be reached via the OFF sequence period 304 after the OFF sequence period 302 ends. Even in such a case, the same effect as above can be obtained.
- the OFF sequence period 30 Although the alternating voltage is applied in 2, 303, a constant voltage may be applied in these periods. In this case, the merit of improving the fritting force characteristics cannot be obtained, but the effect that the transition to the splay alignment is accelerated is the same as described above.
- a black display period like the OFF sequence period 303 a reverse transition can be more effectively generated by a twist forming effect by a lateral electric field described later.
- the voltage applied to the liquid crystal layer 1 is described as being uniform. However, when a voltage exceeding the black display voltage is applied, the voltage may be uneven. In this case, the same effect as above can be obtained.
- applying a voltage to the liquid crystal layer 1 means that a voltage is applied between the pixel electrode 402 and the counter electrode 408. ing.
- the backlight 5 is connected to the driver 2 if the operation of turning off the light after the predetermined sequence as described above can be performed. They do not have to be connected.
- the common electrode 409 may not be provided. In that case, the reverse transition 203 shown in FIG. 5 arises from the adjacent preceding gate line 407. .
- liquid crystal display devices of Embodiments 1 to 3 when the power is turned off, first, a voltage used for display or a voltage higher than the display voltage is applied to the liquid crystal layer 1 to temporarily change the splay alignment remaining in the pixel to bend alignment. This operation is performed to make the data uniform.
- the liquid crystal display device according to the present embodiment is based on the concept that a nucleus of a splay alignment, that is, a nucleus of a reverse transition is formed in each pixel. Details are described below.
- the bend alignment changes to the twist alignment.
- this twist is clockwise or counterclockwise is equivalent in principle.
- the area of this clockwise twist and the counterclockwise twist We have found that, when a twist region is intentionally formed, a disclination line is generated between the regions, and a splay orientation is generated starting from the disclination line.
- a disclination line is an alignment transition region that can be seen on a line, in which liquid crystal molecules continuously change the in-plane orientation. Then, it is considered that an area similar to the spray orientation and having little twist deformation is locally formed in the disclination line.
- a splay alignment nucleus that is, a nucleus of a reverse transition can be formed.
- FIG. 10 schematically shows the structure of each electrode used in the liquid crystal display device of the present embodiment to realize such a concept.
- Reference numeral 62 denotes a pixel electrode in a specific pixel.
- Reference numeral 62 denotes a pixel electrode adjacent to the pixel electrode 602 in the liquid crystal alignment direction (the direction of the source line 406).
- 9 is a common electrode, which corresponds to an example of the specific electrode of the present invention.
- the common electrode 609 is shown as a long shape in FIG. A part of the pixel electrodes 602 and 622 is opposed to a part of the common electrode 609 via the dielectrics 632 and 640.
- a first portion 61 1 and a second portion 61 2 are formed on the outline of the pixel electrode 62 in a direction perpendicular to the longitudinal direction of the common electrode 609. That is, the first portion 611 and the second portion 612 are formed parallel to the orientation direction of the OCB mode liquid crystal in the same plane as the pixel electrodes 62 and 62. Similarly, a first portion 613 and a second portion 614 are formed on the contour of the pixel electrode 622 perpendicularly to the longitudinal direction of the common electrode 609.
- FIG. 11 is an example showing a voltage waveform applied to each electrode shown in FIG. Inverting voltages are applied to the adjacent pixel electrode 62 2 and pixel electrode 62 2 via the common electrode 609 (dot inversion driving). In the example shown in Fig. 11, a voltage of 5 V is applied between each pixel electrode and the counter electrode. For example, when the liquid crystal layer 1 is normally white, a black display voltage is applied to the liquid crystal layer 1. ⁇
- FIG. 12 shows a state in which 10 V is applied to the pixel electrode 62 and 0 V is applied to the pixel electrode 62 in the operation of the dot inversion drive.
- FIG. 12 is a plan view of each electrode having the configuration of FIG. 10 as viewed from the counter electrode 608 side.
- the electric field is directed leftward in the figure with respect to the alignment direction 6 17 of the OCB mode liquid crystal with the first portion 6 11 1 of the pixel electrode 6 2 as a boundary.
- an electric field in the same direction also occurs in the first portion 613 of the pixel electrode 622.
- the OCB mode liquid crystal oriented near the first portions 611 and 613 produces a leftward (counterclockwise) twist in the same plane (counterclockwise twist in FIG. 10).
- an electric field is generated rightward in the figure with the second portion 612 of the pixel electrode 62 as a boundary, and similarly, an electric field is generated in the second portion 614 of the pixel electrode 62 in the same direction.
- the OCB mode liquid crystal aligned near the second portions 612 and 614 generates a rightward (clockwise) twist in the same plane (rightward twist in FIG. 10). Region 6 16).
- the left-handed swish area 615 and the right-handed swish area 616 thus generated produce the above-described discrimination line 610 at the boundary between them. Then, the disclination line 610 serves as a nucleus, and in each pixel, reverse transition occurs extremely stably, and the bend orientation quickly transits to the splay orientation over the entire display surface. '
- a rightward horizontal electric field may be applied to form a clockwise twist
- a leftward horizontal electric field may be applied to generate a leftward twist.
- Such an electrode that generates a horizontal electric field in the right direction and a horizontal electric field in the left direction is hereinafter referred to as a zigzag electrode.
- the configuration shown may be formed continuously to form a zigzag electrode 624.
- the zigzag electrode 624 is formed with an ITO pattern, and a horizontal electric field is applied between the zigzag electrode 624 and the common electrode 609 formed therebelow.
- the zigzag electrode 624 is formed by the ITO pattern of the pixel electrode in this way, applying a voltage for displaying black as a horizontal electric field to the zigzag electrode 624 is most effective for forming the nucleus of the spray alignment. . Then, by removing the charge from the state where the lateral electric field is applied and transiting to the 0 V state, the right and left twists can be effectively formed.
- the display surface can be quickly shifted from the bend alignment to the splay alignment.
- the liquid crystal display device of the present embodiment is characterized in that an electric field is applied between the common electrode 609 formed in the lower part and the pixel electrodes 622, 602 formed in the upper layer.
- +10 V is applied to the pixel electrode 62
- 0 V is applied to the pixel electrode 62
- 5 V is applied to the pixel electrode 692 to generate a horizontal electric field
- the twist is applied.
- FIGS. 17 (a) and 17 (b) show a configuration example of a pixel in such a case.
- FIG. 17 (b) is a partially enlarged view of FIG. 17 (a).
- a zigzag electrode 724 is formed in a region where only the common electrode 729 and the pixel electrode 722 overlap.
- the zigzag electrode 724 'shown in FIG. 17 (b) is formed on the pixel electrode 702 adjacent to the OCB mode liquid crystal in the alignment direction. According to such a configuration, it is possible to reduce the parasitic capacitance between the electrodes, and it is possible to obtain the same effect as described in (h).
- FIGS. 18 (a) and 18 (b) show another example in which a zigzag electrode is formed on one pixel electrode.
- FIG. 18 (b) is a partially enlarged view of FIG. 18 (a).
- the zigzag electrode 824 is formed on the gate electrode 825 which is another example of the specific electrode of the present invention.
- the zigzag electrode 824 also serves as a part of the structure of the TFT 803. Even in such a case, the nuclei of the splay orientation can be formed when the power is turned off in the same manner as described above.
- each zigzag electrode has been described in the case where the first part 61 1, 61 3 and the second part 612, 614 are parallel to the orientation direction of the OCB mode liquid crystal.
- these are not necessarily parallel, and may be in a substantially parallel relationship.
- they may not be parallel and may have a relationship other than vertical.
- FIG. 13 shows a configuration example of an electrode in such a case. Even in such a case, twists in opposite directions can be generated, so that a similar effect can be obtained.
- the first portion Regardless of the relationship between the orientation of the second portion and the orientation of the OCB mode liquid crystal, the relationship between the orientation of the second portion and the orientation of the OCB mode liquid crystal is the same.
- the case where the first portion 6 11, 6 13 forms a left-handed twisted region and the second portion 6 12, 614 forms a right-handed twisted region has been described. If the first part 61 1, 61 3 generates an electric field in the twisting direction, the second part 6 1 2, 614 generates an electric field in the other direction. Let it.
- each zigzag electrode has been described assuming that both the first portion 61 1 and the second portion 6 12 are present, but the first portion 61 1 and the second portion 6 1 It is also conceivable that only one of 12 is present. In this case, since neither the left-handed twist area 6 15 nor the right-handed twist area 616 is formed, no disclination line is formed. However, if any of the twisted regions is formed, there is a high possibility that the nuclei of the splay alignment will be formed, so that the same effect as described above can be obtained to some extent. For example, as shown in FIG.
- the contour of the pixel electrode does not only mean the shape of the outer periphery of the pixel electrode, but also includes a shape such as a hole or a notch formed inside the pixel electrode (for example, See Figure 15).
- each common electrode in the present embodiment may use a previous gate line.
- a TFT 803 having a U-shaped structure may be formed on the gate electrode 825 as shown in FIGS.
- the portion of the contour of the pixel electrode which is effective for twist formation is the portion shown by the thick solid line in FIG. 18 (b). In this way, a configuration in which the protrusion structure protrudes into the lower electrode structure like a gate line may be used.
- the pixel electrode and the other electrode disposed opposite to each other with the dielectric interposed therebetween are other electrodes than the common electrode and the gate electrode. If an electrode other than the pixel electrode is used, an electric charge may be generated at the boundary with the pixel electrode, and in such a case, the same effect as described above can be obtained.
- a horizontal electric field application period can be inserted between the off sequence periods 102 and 202 and the power supply OFF periods 103 and 203.
- a horizontal electric field can be applied simultaneously with the ⁇ ⁇ FF sequence period 304.
- a horizontal electric field can be applied simultaneously with the OFF sequence periods 102, 202, and 303 of the first and second embodiments.
- the predetermined time of the present invention is the OFF sequence period 102 in the first embodiment, and the OFF sequence period 202 in the second embodiment.
- this corresponds to the OFF sequence period 304 or a combination of the OFF sequence periods 302, 303, and 304.
- this corresponds to the time during which the horizontal electric field is applied.
- the OF sequence periods 102 and 202 or the OF sequence periods 302 and 303 may be possible.
- the description has been made on the assumption that the pack light 5 exists, but it is also conceivable that the backlight 5 does not exist, such as a reflective liquid crystal. That is, even if the liquid crystal layer 1 is irradiated only with external light, the same effect as described above can be obtained if the liquid crystal layer 1 can transition from bend alignment to splay alignment in a uniform state when the power is turned off. Can be.
- FIG. 16 is a diagram illustrating the liquid crystal display device according to the fifth embodiment.
- the liquid crystal display device of the present embodiment is characterized in that a non-voltage region 630 is formed in each pixel.
- the pixel electrode 622, the TFT 703, the source signal line 704, and the like are not arranged in the pixel, and the pixel has a voltage with respect to the counter electrode 608.
- the non-voltage region 630 has such a size that at least a part thereof can maintain the splay alignment without being affected by the surrounding bend alignment even when the display voltage is applied to the pixel. I have.
- the size of the no-voltage region 630 has a size of 400 / zm 2 or more.
- the operation of the liquid crystal display device of the present embodiment will be described.
- the splay alignment portion remains in the no-voltage region 630, the splay alignment spreads quickly over the entire display surface when the power is turned off. .
- the bend alignment around the no-voltage region 630 is bend alignment, and the splay alignment of the no-voltage region 630 is not affected even when the OCB mode liquid crystal stands up.
- the display surface can quickly shift from the bend alignment to the splay alignment at the time of power supply OFF, regardless of the display state of the display surface before the power supply OFF. That is, when the power is turned off, the display does not depend on intrusion of the surrounding spray orientation or accidental nucleation of the spray orientation, so that the display surface can be quickly changed from the bend orientation to the spray orientation without a long twist orientation. Can be migrated.
- the liquid crystal display device of the present embodiment When the liquid crystal display device of the present embodiment is used in combination with the liquid crystal display devices of Embodiments 1 to 3 or the liquid crystal display device of Embodiment 4, when the power is turned off, the display surface is uniform and more quickly. It is possible to shift to the splay alignment. However, the liquid crystal display device of the present embodiment does not use in combination with the liquid crystal display devices of Embodiments 1 to 4, since the splay alignment remains irrespective of the state before the power is turned off. However, the same effect can be obtained.
- the present invention is a program for causing a computer to execute the functions of all or a part of the liquid crystal display device of the present invention described above, and may be a program that operates in cooperation with a computer. .
- the present invention provides a program for causing a computer to execute all or a part of the functions of all or part of the above-described liquid crystal display device of the present invention.
- a computer May be a medium readable by a computer, and the read program may execute the function in cooperation with the computer.
- the present invention also includes a computer-readable recording medium that records the program of the present invention.
- One usage form of the program of the present invention may be a form in which the program is recorded on a computer-readable recording medium and operates in cooperation with the computer.
- One use form of the program of the present invention may be such that the program is transmitted through a transmission medium, read by a computer, and operates in cooperation with a computer.
- the recording medium includes ROM and the like
- the transmission medium includes a transmission mechanism such as the Internet, light, radio waves, and sound waves.
- the computer of the present invention described above is not limited to a pure hardware such as a CPU, but may include firmware, OS, and peripheral devices.
- FIG. 7 shows each OFF sequence in the liquid crystal display devices according to the first to third embodiments. Specific data on the difference in transition time to splay alignment depending on the combination of periods is shown.
- black display (5 s, 6 V) means that a black display voltage of 6 V is applied for 5 seconds.
- the time required for the entire panel to shift to the splay alignment after the power-off operation was performed was 36 seconds.
- this time was 25 seconds.
- this time was 12 seconds.
- this time was 5 seconds.
- the liquid crystal display device stopping method, the program, and the recording medium according to the present invention in a liquid crystal display device using OCB mode liquid crystal, it is possible to prevent unevenness of a display screen after power is turned off; It is useful as a liquid crystal display device.
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Abstract
Description
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JP2005507966A JP4421559B2 (ja) | 2003-01-08 | 2004-01-07 | 液晶表示装置 |
EP04700517A EP1582911A4 (en) | 2003-01-08 | 2004-01-07 | LIQUID CRYSTAL DISPLAY |
US10/528,416 US7714819B2 (en) | 2003-01-08 | 2004-01-07 | Liquid crystal display |
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EP (2) | EP1582911A4 (ja) |
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- 2004-01-07 EP EP07010619A patent/EP1818716A3/en not_active Withdrawn
- 2004-01-07 JP JP2005507966A patent/JP4421559B2/ja not_active Expired - Fee Related
- 2004-01-07 WO PCT/JP2004/000045 patent/WO2004063801A1/ja not_active Application Discontinuation
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Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
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US7737934B2 (en) * | 2005-09-23 | 2010-06-15 | Hannstar Display Corporation | Pixel structure of liquid crystal device and driving method thereof |
JP2014041348A (ja) * | 2012-07-26 | 2014-03-06 | Semiconductor Energy Lab Co Ltd | 液晶表示装置 |
JP2018067002A (ja) * | 2012-07-26 | 2018-04-26 | 株式会社半導体エネルギー研究所 | 電子機器 |
WO2015072402A1 (ja) * | 2013-11-15 | 2015-05-21 | シャープ株式会社 | 液晶表示装置およびその駆動方法 |
JPWO2015072402A1 (ja) * | 2013-11-15 | 2017-03-16 | シャープ株式会社 | 液晶表示装置およびその駆動方法 |
US9953594B2 (en) | 2013-11-15 | 2018-04-24 | Sharp Kabushiki Kaisha | Liquid crystal display device and method for driving same |
EP3643869A1 (en) | 2018-10-22 | 2020-04-29 | Technoform Glass Insulation Holding GmbH | Spacer for an insulating glazing unit preventing thermal stress |
Also Published As
Publication number | Publication date |
---|---|
JPWO2004063801A1 (ja) | 2006-05-18 |
EP1818716A2 (en) | 2007-08-15 |
US7714819B2 (en) | 2010-05-11 |
US20060007096A1 (en) | 2006-01-12 |
KR100732104B1 (ko) | 2007-06-25 |
EP1582911A1 (en) | 2005-10-05 |
EP1582911A4 (en) | 2007-08-08 |
TW200509041A (en) | 2005-03-01 |
TWI252458B (en) | 2006-04-01 |
KR20050025618A (ko) | 2005-03-14 |
EP1818716A3 (en) | 2007-11-07 |
JP4421559B2 (ja) | 2010-02-24 |
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