WO2010035548A1 - 液晶表示装置、アクティブマトリクス基板、電子機器 - Google Patents
液晶表示装置、アクティブマトリクス基板、電子機器 Download PDFInfo
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- WO2010035548A1 WO2010035548A1 PCT/JP2009/059786 JP2009059786W WO2010035548A1 WO 2010035548 A1 WO2010035548 A1 WO 2010035548A1 JP 2009059786 W JP2009059786 W JP 2009059786W WO 2010035548 A1 WO2010035548 A1 WO 2010035548A1
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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
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/1362—Active matrix addressed cells
- G02F1/136286—Wiring, e.g. gate line, drain line
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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
- G09G3/3614—Control of polarity reversal in general
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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
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/1362—Active matrix addressed cells
- G02F1/13624—Active matrix addressed cells having more than one switching element per pixel
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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
- G02F1/13756—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 the liquid crystal selectively assuming a light-scattering state
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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
- G02F2203/00—Function characteristic
- G02F2203/03—Function characteristic scattering
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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
- G09G2300/0439—Pixel structures
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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
- G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
- G09G2300/0809—Several active elements per pixel in active matrix panels
- G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
- G09G2300/0861—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select 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
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0262—The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data 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
- G09G2310/00—Command of the display device
- G09G2310/04—Partial updating of the display screen
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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
- G09G2330/021—Power management, e.g. power saving
- G09G2330/023—Power management, e.g. power saving using energy recovery or conservation
Definitions
- the present invention relates to a liquid crystal display device having a memory function.
- a video signal is supplied to a liquid crystal capacitor in a pixel formation unit for displaying pixels.
- the writing cycle is lengthened.
- a circuit having a memory function (hereinafter referred to as a pixel memory circuit) is provided in each pixel formation portion so that the voltage applied to the liquid crystal capacitance is maintained. Yes.
- liquid crystal display device incorporating such a pixel memory circuit
- Examples of the liquid crystal display device incorporating such a pixel memory circuit include the display device disclosed in Patent Document 1.
- a light scattering type liquid crystal that does not require a polarizing plate in order to reduce the thickness of the display portion.
- This light-scattering type liquid crystal not only makes the liquid crystal display device thinner, but also has advantages such as high light utilization efficiency and low viewing angle dependency because a polarizing plate is unnecessary.
- JP 2007-286237 (published Nov. 1, 2007)
- the light-scattering type liquid crystal usually scatters light by inducing an irregular state of liquid crystal molecules when no voltage is applied (white display), and transparent when the liquid crystal molecules are aligned in the electric field direction when a voltage is applied. (Mirror display by black display / reflection electrode or external reflection plate). For this reason, when used in a liquid crystal display device with a built-in pixel memory circuit, there is a problem that the contrast is lowered due to scattering without applying voltage to the liquid crystal in the gap between the upper, lower, left and right adjacent pixel electrodes, and the pixel memory circuit There is a problem in that the aperture ratio decreases due to the provision in the pixel.
- a display device having a SHA (Super High Aperture) structure in which pixel electrodes and wirings such as signal wirings are partially overlapped.
- SHA Super High Aperture
- a plurality of gate bus lines GL501 (scanning signal lines) and source bus lines SL502 (data signal lines) are arranged so as to be orthogonal to each other, and switching elements (not shown) are arranged at respective intersections.
- a display device in which a pixel memory circuit portion 503 is arranged and a pixel electrode (ITO etc.) 504 and a reflective electrode (AL / Mo etc.) 505 are provided corresponding to each of the pixel memory circuit portions 503 can be considered.
- the display device having the above-described configuration has a structure in which the pixel electrode 504 is formed so as to cover a part of the data signal line 502, as shown in FIG. Further, the pixel electrode 504 has a structure formed so as to cover a part of the first voltage supply wiring VLA 506 connected to the pixel memory circuit portion 503.
- the data signal line 502 that does not switch the signal in units of frames when not writing is arranged so that the effective voltage applied to the liquid crystal in the corresponding portion is slightly adjacent. This is because it fluctuates in the frame, and this influence causes the region 800 to be visually recognized as flicker because of its low frequency.
- an object of the present invention is to provide a liquid crystal display device with high display quality free from flicker.
- the liquid crystal display device has a first display state in which the arrangement of liquid crystal molecules becomes irregular between the active matrix substrate and the counter substrate when no voltage is applied;
- a liquid crystal display device in which a light diffusing liquid crystal in a second display state in which the arrangement of liquid crystal molecules is in a regular state when applied, a plurality of video signals representing an image to be displayed are provided on the active matrix substrate Corresponding to the intersections of the plurality of data signal wirings, the plurality of scanning signal wirings intersecting with the plurality of data signal wirings, and the plurality of data signal wirings and the plurality of scanning signal wirings, respectively.
- the first display state is realized based on pixel electrodes arranged in a matrix and video signals provided for each pixel electrode and transmitted by the data signal wiring.
- the first display data for capturing is acquired via the first supply wiring
- the second display data for realizing the second display state is captured via the second supply wiring, and the display stores each data.
- a data storage circuit is formed, and the counter substrate is opposed to the pixel electrode of the active matrix substrate, and the counter electrode applies a counter voltage to the light diffusion liquid crystal in synchronization with a voltage applied to the pixel electrode.
- the data signal wiring is on the active matrix substrate, and the scanning signal wiring and the scanning signal wiring out of the region obtained by projecting the gap between the adjacent pixel electrodes on the surface below the pixel electrode formation surface.
- the scanning signal wiring and the scanning signal wiring out of the region obtained by projecting the gap between the adjacent pixel electrodes on the surface below the pixel electrode formation surface.
- the liquid crystal drive is a low frequency drive on the order of several Hz, as described above, the fluctuation of the effective voltage applied to the liquid crystal in the gap provided between the pixel electrodes adjacent to each other in the extending direction of the scanning signal wiring is changed. Since it is small, the occurrence of flicker due to the fluctuation of the effective voltage can be suppressed, and as a result, the display quality can be improved.
- the region where the data signal wiring is formed is the region on the active matrix substrate, and the region obtained by projecting the gap between adjacent pixel electrodes on the surface below the pixel electrode formation surface.
- a region that does not overlap with a region orthogonal to the scanning signal wiring is preferable.
- the first supply wiring or the second supply wiring it is preferable that a shared wiring electrically connected to either the first supply wiring or the second supply wiring is formed in a region where one of them is formed and orthogonal to the scanning signal wiring.
- the data signal wiring and the shared wiring are formed in the same layer on the active matrix substrate.
- the data signal wiring and the shared wiring can be formed at the same time, the time required for manufacturing the liquid crystal display device can be reduced as compared with the case where each wiring is formed separately.
- the first supply wiring, the second supply wiring, and the shared wiring are formed in different layers with an insulating film interposed therebetween, and the shared wiring is connected to the first supply wiring or the second supply wiring. Are electrically connected through contact holes.
- each wiring is formed in a different layer through an insulating film, and the shared wiring is electrically connected through a contact hole at the intersection with the first supply wiring or the second supply wiring.
- the shared wiring, the first supply wiring, and the second supply wiring are only electrically connected at the minimum necessary position, leakage between the wirings in the same layer can be prevented.
- the liquid crystal display device includes a first display state in which the arrangement of liquid crystal molecules is irregular when no voltage is applied between the active matrix substrate and the counter substrate, and a liquid crystal when a voltage is applied.
- a plurality of video signals representing an image to be displayed are transmitted to the active matrix substrate, respectively.
- a display data storage circuit that takes in the display data through the first supply wiring, and takes in the second display data for realizing the second display state through the second supply wiring, and stores the respective data.
- the counter substrate is formed with a counter electrode facing the pixel electrode of the active matrix substrate and applying a counter voltage to the light diffusing liquid crystal in synchronization with a voltage applied to the pixel electrode.
- the adjacent pixels from the region orthogonal to the scanning signal wiring Since the data signal wiring is formed in a region shifted to one side of the electrode, at least a part of the data signal wiring is covered with the pixel electrode. That is, at least a part of the data signal wiring is electrically shielded by the pixel electrode.
- the liquid crystal drive is a low frequency drive on the order of several Hz, as described above, the fluctuation of the effective voltage applied to the liquid crystal in the gap provided between the pixel electrodes adjacent to each other in the extending direction of the scanning signal wiring is changed. Since it is small, the occurrence of flicker due to the fluctuation of the effective voltage can be suppressed, and as a result, the display quality can be improved.
- FIG. 1 is a schematic plan view in the vicinity of a pixel electrode in a display unit of a liquid crystal display device.
- FIG. 2 is AA arrow sectional drawing of FIG.
- FIG. 2 is a cross-sectional view taken along line BB in FIG. 1.
- It is a block diagram which shows the whole structure of the said liquid crystal display device.
- FIG. 2 is an equivalent circuit diagram of a pixel memory circuit unit provided in the liquid crystal display device. It is a signal waveform diagram of a gate bus line and a memory drive selection line. It is a signal waveform diagram in the case where black display is performed for a pixel whose value of data in memory MD is “1”.
- FIG. 10 showing another embodiment of the present invention, is a schematic plan view in the vicinity of a pixel electrode in a display unit of a liquid crystal display device. It is CC sectional view taken on the line of FIG. FIG. 32, showing still another embodiment of the present invention, is a schematic plan view in the vicinity of a pixel electrode in a display unit of a liquid crystal display device. It is a schematic plan view of the pixel electrode vicinity in the display part of the conventional liquid crystal display device.
- FIG. 13 is a sectional view taken along line ZZ in FIG. 12.
- FIG. 4 is a block diagram showing the overall configuration of the liquid crystal display device according to one embodiment of the present invention.
- the liquid crystal display device includes a liquid crystal display panel 100 and a display control circuit 200 as shown in FIG.
- the liquid crystal display panel 100 includes a source driver (video signal line driving circuit) 300, a gate driver (scanning signal line driving circuit) 400, a display unit 500, and a memory driving driver 600 as a supply voltage generation circuit. Yes.
- the display control circuit 200 includes a memory drive control unit 20 as a duty ratio setting circuit.
- the display unit 500 includes a source bus line (data signal wiring), a gate bus line (scanning signal wiring), a memory drive selection line (to be described later), a first voltage supply line, a second voltage supply line, and a first power supply. A line, and a second power line.
- the source bus line is connected to the source driver 300, the gate bus line and the memory drive selection line are connected to the gate driver 400, and the first voltage supply line and the second voltage supply line are connected to the memory drive driver 600. Has been.
- the display unit 500 includes a first display state in which the arrangement of liquid crystal molecules is irregular when no voltage is applied between the active matrix substrate and the counter substrate, and a state in which the arrangement of liquid crystal molecules is regular when a voltage is applied. It is a liquid crystal display panel which encloses the light diffusion type liquid crystal which becomes the 2nd display state which becomes.
- the display unit 500 includes a plurality of pixel formation units provided in a matrix corresponding to the intersections of the gate bus lines and the source bus lines.
- Each pixel forming portion includes a pixel electrode for applying a voltage according to an image to be displayed to a liquid crystal capacitor described later, a common electrode that is a common electrode provided in the plurality of pixel forming portions, and The liquid crystal layer is provided in common to a plurality of pixel formation portions and is sandwiched between the pixel electrode and the common electrode.
- the display unit 500 is a pixel composed of three sub-pixels for R (Red: red), G (Green: green), and B (Blue: blue) (
- a pixel memory circuit is provided as a memory circuit that can hold 1-bit data for each pixel).
- the display unit 500 is provided with the pixel memory circuit for each pixel that has a pixel pitch that is three times the pixel pitch (sub-pixel pitch) of each color type color.
- liquid crystal display device will be described as a normally white color type.
- the driving method can be switched between “normal driving” and “memory driving”.
- “normal driving” is a driving method generally performed in a liquid crystal display device, and writing to a liquid crystal capacitor (application of voltage) based on a video signal applied to each source bus line. It is a method to do.
- “memory driving” is a method of performing writing to the liquid crystal capacitor based on data held in the pixel memory circuit.
- first display mode the display state during memory driving is referred to as “second display mode”.
- the display control circuit 200 receives image data DAT and a display mode instruction signal M sent from the outside, receives a digital video signal DV, a source start pulse signal SSP for controlling image display on the display unit 500, and a source clock signal.
- SCK, latch strobe signal LS, gate start pulse signal GSP, gate clock signal GCK, first supply voltage control signal SAL, second supply voltage control signal SBL, and memory drive control signal SSEL are output.
- the source driver 300 receives the digital video signal DV, the source start pulse signal SSP, the source clock signal SCK, and the latch strobe signal LS output from the display control circuit 200, and applies a driving video signal to each source bus line. To do.
- the gate driver 400 Based on the gate start pulse signal GSP and the gate clock signal GCK output from the display control circuit 200, the gate driver 400 sequentially selects each gate bus line by one horizontal scanning period during normal driving. The application of the active scanning signal to each gate bus line is repeated with one vertical scanning period as a cycle.
- the gate driver 400 selects the gate bus pulse line GSP and the gate clock signal output from the display control circuit 200 in order to sequentially select each gate bus line by one horizontal scanning period. Based on GCK, an active scanning signal is sequentially applied to each gate bus line, and the memory drive output from the display control circuit 200 is selected in order to sequentially select each memory drive selection line by one horizontal scanning period. An active signal is sequentially applied to each memory drive selection line based on the control signal SSEL and the gate clock signal GCK. When the memory is driven, the gate driver 400 stops the application of the active scanning signal to each gate bus line, and applies the active signal to all the memory driving selection lines SEL1 to SELm.
- the memory driving driver 600 includes a first voltage supply line and a second voltage supply line based on the first supply voltage control signal SLA and the second supply voltage control signal SLB output from the display control circuit 200.
- a voltage signal (VLA, VLB) is applied to.
- the voltage signal VLA is a voltage signal having a phase opposite to that of the counter voltage applied to the counter electrode
- the voltage signal VLB is a voltage signal having the same phase as the counter voltage applied to the counter electrode.
- FIG. 1 shows a schematic plane in the vicinity of the pixel electrode in the display unit 500.
- the counter electrode is omitted for convenience of explanation.
- a plurality of display units 500 are arranged such that gate bus lines GL501 (scanning signal wirings) and source bus lines SL502 (data signal wirings) are orthogonal to each other, and switching elements (see FIG. And an active matrix substrate on which a pixel memory circuit portion 503 (display data storage circuit) is arranged.
- a plurality of video signals representing images to be displayed are transmitted to the source bus lines SL502.
- the display unit 500 also includes a counter substrate disposed to face the active matrix substrate.
- a pixel electrode (ITO etc.) 504 and a reflective electrode (Al / M réelle etc.) 505 are provided corresponding to each of the pixel memory circuit portions 503.
- the pixel memory circuit unit 503 includes a first voltage supply wiring VLA506 to which voltage signals (VLA, VLB) from the memory driving driver 600 are supplied, and A second voltage supply wiring VLB507 is connected.
- the first voltage supply line VLA506 and the second voltage supply line VLB507 are provided in parallel to the gate bus line GL501, and the first voltage supply line VLA506 is provided between the pixel electrodes 504, and the second voltage supply line.
- the VLB 507 is provided at a position covered with the pixel electrode 504.
- the first voltage supply line VLA 506 corresponds to a first voltage supply line (first supply line) that supplies the voltage signal VLA (first display data) from the memory driving driver 600 to the pixel memory circuit unit 503.
- the second voltage supply line VLB507 corresponds to a second voltage supply line (second supply line) for supplying the voltage signal VLB (second display data) from the memory driver 600 to the pixel memory circuit unit 503. To do.
- the pixel memory circuit unit 503 is provided for each pixel electrode 504, and realizes the first display state in the display unit 500 based on the video signal transmitted by the source bus line SL502.
- the voltage signal VLA which is the first display data, is taken in via the first voltage supply wiring VLA 506, which is the first supply wiring, and is the second display data for realizing the second display state in the display unit 500.
- the voltage signal VLB is taken in via the second voltage supply line VLA507, which is the second supply line, and each data is stored.
- the source bus line SL502 is formed in a region where a gap 800 provided between the pixel electrode 504 and the pixel electrode 504 is projected onto the active matrix substrate.
- the source bus line SL502 is slightly shifted from a position corresponding to a gap provided between the pixel electrode 504 and the pixel electrode 504 as illustrated in FIG. It is formed at the position to be covered. That is, from the region on the active matrix substrate obtained by projecting the gap between the adjacent pixel electrodes 504 on the surface below the pixel electrode formation surface, from the region orthogonal to the gate bus line GL501, The source bus line SL502 is formed in a region shifted to one side of the adjacent pixel electrode 504.
- a shared voltage supply wiring 508 (shared wiring) is formed between the pixel electrode 504 and the pixel electrode 504.
- the shared voltage supply wiring 508 is electrically connected by a contact hole 509 at a position intersecting with the first voltage supply wiring VLA 506.
- FIG. 2 shows a cross section taken along line AA in FIG.
- the shared voltage supply wiring 508 is formed wider than the distance X between the ends 504a and 504a of the adjacent pixel electrodes 504 and 504, and is the same layer as the source bus line SL502 ( In the same layer).
- the shared voltage supply wiring 508 may be a wiring of any material as long as it is a conductive material, and is particularly preferably a metal wiring.
- a resin film (JAS) 510 for forming a SHA structure is formed between the shared voltage supply wiring 508 and the source bus line SL502 and the pixel electrode 504.
- a liquid crystal layer 512 made of a light scattering type liquid crystal is formed between the counter electrode 511 to be applied to.
- This light-scattering type liquid crystal displays a white display by diffusing light when the voltage is not applied and diffusing the light, and controlling the liquid crystal alignment when a voltage is applied.
- FIG. 3 shows a cross section taken along line BB in FIG.
- the shared voltage supply wiring 508 is electrically connected to a first voltage supply wiring VLA 506 provided below the data signal line 502 through a contact hole 509. Yes.
- An interlayer insulating film (such as SiO 2) 513 is also formed below the shared voltage supply wiring 508.
- the shared voltage supply wiring 508 is electrically connected to the first voltage supply wiring VLA 506, the same voltage signal VLA is applied to the periphery of the pixel electrode 504. That is, a voltage signal having a phase opposite to that of the counter voltage applied to the counter electrode 511 is supplied around the pixel electrode 504.
- FIG. 5 is an equivalent circuit diagram showing a detailed configuration of the pixel memory circuit unit 503.
- the pixel memory circuit unit 503 includes CMOS switches SWM1 and SWM2 composed of P-type TFTs and N-type TFTs, switches SWM4 and SWM6 realized by N-type TFTs, and switches SWM3 and SWM5 realized by P-type TFTs. And SWM7.
- the source terminals of the switches SWM3 and SWM5 are connected to the first power supply line VLCH.
- the source terminals of the switches SWM4 and SWM6 are connected to the second power supply line VLCL.
- the gate terminal of the switch SWM7 is connected to the gate bus line GL501.
- a circuit composed of the switches SWM3 and SWM4 and a circuit composed of the switches SWM5 and SWM6 function as an inverter circuit, and the switch SWM7 functions as a transfer gate.
- the circuit including the switches SWM3, SWM4, SWM5, SWM6, and SWM7 functions as a data holding circuit 559 that holds 1-bit data.
- the switch SWM1 has an input terminal connected to the first voltage supply wiring VLA506 and an output terminal connected to the source terminal of the switch SWR3 and the output terminal of the switch SWM2.
- the switch SWM2 has an input terminal connected to the second voltage supply wiring VLB507 and an output terminal connected to the source terminal of the switch SWR3 and the output terminal of the switch SWM1.
- the gate terminal of the N-type TFT of the switch SWM1 is connected to the drain terminal of the switch SWR4 and the data holding circuit 559.
- the gate terminal of the P-type TFT of the switch SWM1 is connected to the gate terminal of the N-type TFT of the switch SWM2 and the data holding circuit 559.
- the gate terminal of the N-type TFT of the switch SWM2 is connected to the gate terminal of the P-type TFT of the switch SWM1 and the data holding circuit 559.
- the gate terminal of the P-type TFT of the switch SWM2 is connected to the data holding circuit 559.
- FIG. 6 shows the first, second, third, and m-th gate bus lines GL1, GL2, GL3, and GLm, and the first, second, third, and m-th memory drives. It is a signal waveform diagram of selection lines SEL1, SEL2, SEL3, SELm.
- switching between normal driving for the first display mode and memory driving for the second display mode is performed. This switching is performed based on a display mode instruction signal M sent to the display control circuit 200 from the outside.
- a driving method during normal driving a driving method when switching from normal driving to memory driving, and a driving method during memory driving will be described in order.
- normal driving is performed from time t0 to time t1.
- active signals are sequentially given to the respective gate bus lines GL1 to GLm for a predetermined period.
- no active signal is applied to the memory drive selection lines SEL1 to SELm.
- the switch SWR1 when an active signal is applied to the gate bus line GL provided corresponding to the pixel unit, the switch SWR1 is turned on. Since no active signal is applied to the memory drive selection line SEL during normal driving, the switch SWR2 is turned on and the switches SWR3 and SWR4 are turned off. Thus, writing to the liquid crystal capacitor 551R is performed based on the video signals respectively applied to the source bus line SL502. In this manner, video signals are written into the liquid crystal capacitor 551R for all the pixel units within one frame period, and a desired image is displayed on the display unit 500.
- the R pixel is illustrated. Therefore, in the above description, only the driving of the R pixel has been described. However, the G pixel and the B pixel are also driven in the same manner as the R pixel. It shall be.
- an active signal is applied to the gate bus line GL provided corresponding to the pixel unit, and the memory drive selection provided corresponding to the pixel unit.
- an active signal is applied to the line SEL, the switch SWR1 is turned on, the switch SWR2 is turned off, and the switch SWR3 is turned on. Further, the switch SWR4 is turned on. Accordingly, the video signal applied to the source bus line SL is given to the pixel memory circuit 503, and the video signal is stored in the data holding circuit 559 in the pixel memory circuit 503 as in-memory data MD.
- the in-memory data MD is stored in the pixel memory circuit 503 for all the pixel units during the period from the time point t1 to the time point t2.
- the video signal is binarized (when the logic level is divided into high level data and low level data)
- the logic level is high
- the in-memory data it is assumed that “1” is stored in the pixel memory circuit 503 as MD, and “0” is stored in the pixel memory circuit 503 as in-memory data MD if the logical level is low.
- memory drive is performed from time t2 to time t3.
- active signals are not applied to the gate bus lines GL1 to GLm.
- the switch SWR1 is always in the OFF state during this period.
- the value of the in-memory data MD is not affected by the video signal supplied by the source bus line SL during the memory driving period.
- FIG. 7 is a signal waveform diagram in the case where black display is performed for the pixel unit whose value of the in-memory data MD is “1”.
- the common electrode 552 is inverted and driven during both normal driving and memory driving. That is, the potential Vcont of the common electrode 552 is switched between a high potential and a low potential at a predetermined interval.
- an active signal is not applied to the gate bus line GL when the memory is driven, so that the switch SWM7 is in an on state regardless of the value of the in-memory data MD. For this reason, the value of the in-memory data MD is held during the period in which the memory is driven.
- first supply voltage the voltage (hereinafter referred to as “first supply voltage”) VLA applied from the first voltage supply wiring VLA 506 becomes the pixel electrode 555R of the sub-pixel (not shown, but the same applies to other G pixels and B pixels). Applied.
- the first supply voltage is set.
- the potential of VLA is set on the low potential side
- the potential of the first supply voltage VLA is set on the high potential side. . Therefore, a high voltage is always applied to the liquid crystal capacitor 551R, and black display is performed for the pixel unit including the liquid crystal capacitor 551R.
- FIG. 8 is a signal waveform diagram in the case where white display is performed for a pixel whose value of the in-memory data MD is “0”. Focusing on the on / off states of the switches SWM3 to SWM7 in the data holding circuit 559, when the in-memory data MD is “0”, the switch SWM3 is turned on and the switch SWM4 is turned off. Therefore, a high potential power supply voltage is applied from the first power supply line VLCH to the data holding circuit 559 via the switch SWM3. As a result, the switch SWM5 is turned off and the switch SWM6 is turned on. As a result, a low-potential power supply voltage is applied from the second power supply line VLCL to the data holding circuit 559 via the switch SWM6. Note that the switch SWM7 is in an ON state as in the case where the value of the in-memory data MD is “1”. For this reason, the value of the in-memory data MD is held during the period in which the memory is driven.
- the P-type TFT of the switch SWM1 is turned off and the N-type TFT of the switch SWM2 is turned on.
- the N-type TFT of the switch SWM1 is in an off state, and the switch SWM2 has a P value.
- the type TFT is turned on. As a result, the switch SWM1 is turned off and the switch SWM2 is turned on.
- a voltage signal (hereinafter referred to as “second supply voltage”) VLB supplied from the second voltage supply wiring VLB 507 is a pixel electrode 555R of the sub pixel (the same applies to other G pixels and B pixels not shown). To be applied.
- the second supply voltage VLB when the potential Vcont of the common electrode 552 is set to the high potential side (period T21), the second supply voltage VLB The potential is set on the high potential side, and when the potential Vcont of the common electrode 552 is set on the low potential side (period T22), the potential of the second supply voltage VLB is set on the low potential side. Therefore, a low voltage is always applied to the liquid crystal capacitor 551R, and white display is performed for the pixel unit including the liquid crystal capacitor 551R.
- the source bus line SL502 is electrically shielded by the pixel electrode 504, the source bus line SL502 having a counter voltage applied from the counter electrode of the counter substrate.
- the influence on can be reduced.
- the display quality can be improved.
- a shared voltage supply wiring 508 is formed between the pixel electrode 504 and the pixel electrode 504 where the source bus line SL502 should be originally formed, and the shared voltage supply wiring 508 is connected to the first voltage. They are electrically connected by a contact hole 509 at a position intersecting with the supply wiring VLA 506.
- the signal flowing through the shared voltage supply wiring 508 becomes the same signal as the first voltage supply wiring VLA 506, that is, a signal having a phase opposite to that of the counter signal applied from the counter electrode, and a gap formed between adjacent pixel electrodes 504. Is displayed in black. Accordingly, since the occurrence of flicker can be almost eliminated, the display quality when the liquid crystal display device is driven at a low frequency can be improved.
- the first voltage signal VLA is applied around the pixel electrode 504.
- the second voltage signal VLB is applied around the pixel electrode 504. The structure to perform is demonstrated.
- FIG. 9 shows a schematic plane in the vicinity of the pixel electrode in the display unit 500.
- the counter electrode is omitted for convenience of explanation.
- the difference between the present embodiment and the first embodiment is that the shared voltage supply wiring 508 is connected to the second voltage supply wiring VLB 507 instead of the first voltage supply wiring VLA 506. Since the configuration other than this is the same as that of the first embodiment, detailed description of each member is omitted.
- FIG. 10 shows a cross section taken along line CC of FIG.
- the shared voltage supply wiring 508 is electrically connected to a second voltage supply wiring VLB 507 provided below the data signal line 502 through a contact hole 520. Yes.
- An interlayer insulating film (such as SiO 2) 513 is also formed below the shared voltage supply wiring 508.
- the shared voltage supply wiring 508 is electrically connected to the second voltage supply wiring VLB 507, the same voltage signal VLB is applied around the pixel electrode 504. That is, a voltage signal having the same phase as the counter voltage applied to the counter electrode 511 is supplied around the pixel electrode 504.
- the source bus line SL502 is electrically shielded by the pixel electrode 504, the source bus line SL502 having a counter voltage applied from the counter electrode of the counter substrate.
- the influence on can be reduced.
- the display quality can be improved.
- a shared voltage supply wiring 508 is formed between the pixel electrode 504 and the pixel electrode 504 where the source bus line SL502 should be originally formed, and the shared voltage supply wiring 508 is connected to the second voltage. They are electrically connected by a contact hole 520 at a position intersecting with the supply wiring VLA 507.
- the signal flowing through the shared voltage supply wiring 508 becomes the same signal as that of the second voltage supply wiring VLA 507, that is, a signal having the same phase as the opposing signal applied from the opposing electrode, and a gap formed between adjacent pixel electrodes 504. Is displayed in white. Accordingly, since the occurrence of flicker can be almost eliminated, the display quality when the liquid crystal display device is driven at a low frequency can be improved.
- the first voltage supply wiring VLA 506 and the second voltage supply wiring VLB 507 connected to the pixel memory circuit portion 503 are scanned signals.
- the structure is arranged in parallel with the line 501. This is because when the pixel pitch in the right and left direction (perpendicular to the data signal line) in the display unit 500 is small as in the case of forming one pixel with three RGB sub-pixels as in the color type, the aperture ratio This is because the longitudinal direction of the pixel memory circuit portion 503 is arranged so as to be parallel to the data signal line 502 in order to secure a line / space in each wiring.
- the scanning signal line 501 is arranged in the longitudinal direction of the pixel memory circuit portion 503. It is good also as a structure arrange
- the first voltage supply wiring VLA 506 and the second voltage supply wiring VLB 507 connected to the pixel memory circuit portion 503 are arranged in parallel with the data signal line 502.
- a liquid crystal display device that requires a display mode that uses the memory function is provided.
- the present invention can also be applied to mobile terminals such as mobile phones and electronic devices.
- memory drive control unit 100 liquid crystal display panel 200 display control circuit 300 source driver 400 gate driver 500 display unit 502 data signal line 503 pixel memory circuit unit 504 pixel electrode 504a end 505 reflection electrode 508 shared voltage supply wiring 509 contact hole 510 resin Film 511 Counter electrode 512 Liquid crystal layer 513 Interlayer insulating film 520 Contact hole 551 Liquid crystal capacitor 552 Common electrode 555R Pixel electrode 559 Data holding circuit 600 Memory drive driver
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Abstract
Description
本発明の一実施の形態について説明すれば、以下の通りである。
本発明の他の実施形態について説明すれば、以下の通りである。
100 液晶表示パネル
200 表示制御回路
300 ソースドライバ
400 ゲートドライバ
500 表示部
502 データ信号線
503 画素メモリ回路部
504 画素電極
504a 端部
505 反射電極
508 共有電圧供給配線
509 コンタクトホール
510 樹脂膜
511 対向電極
512 液晶層
513 層間絶縁膜
520 コンタクトホール
551 液晶容量
552 共通電極
555R 画素電極
559 データ保持回路
600 メモリ駆動用ドライバ
Claims (9)
- アクティブマトリクス基板と対向基板との間に、電圧無印加時に液晶分子の配列が不規則な状態となる第1表示状態と、電圧印加時に液晶分子の配列が規則的な状態となる第2表示状態となる光拡散型液晶を封入してなる液晶表示装置において、
上記アクティブマトリクス基板には、
表示すべき画像を表す複数の映像信号をそれぞれ伝達するための複数のデータ信号配線と、
上記複数のデータ信号配線と交差する複数の走査信号配線と、
上記複数のデータ信号配線と上記複数の走査信号配線との交差点にそれぞれ対応してマトリクス状に配置された画素電極と、
上記画素電極毎に設けられ、上記データ信号配線によって伝達される映像信号に基づいて、上記第1表示状態を実現するための第1表示データを、第1供給配線を介して取り込むと共に、上記第2表示状態を実現するための第2表示データを、第2供給配線を介して取り込み、それぞれのデータを記憶する表示データ記憶回路とが形成され、
上記対向基板には、
上記アクティブマトリクス基板の画素電極に対向し、当該画素電極に印加される電圧に同期して対向電圧を上記光拡散型液晶に印加する対向電極が形成され、
上記アクティブマトリクス基板上であって、画素電極形成面よりも下層の面に隣接画素電極間の間隙を投影して得られる領域のうち、上記走査信号配線と直交する領域から、当該隣接する画素電極の一方側にずらした領域に、上記データ信号配線が形成されていることを特徴とする液晶表示装置。 - 上記データ信号配線が形成される領域は、上記アクティブマトリクス基板上であって、上記画素電極形成面よりも下層の面に隣接画素電極間の間隙を投影して得られる領域のうち、上記走査信号配線と直交する領域と重ならない領域であることを特徴とする請求項1に記載の液晶表示装置。
- 上記アクティブマトリクス基板上であって、上記画素電極形成面よりも下層の面に隣接画素電極間の間隙を投影して得られる領域には、上記第1供給配線または第2供給配線の何れか一方に電気的に接続された共有配線が形成されていることを特徴とする請求項2に記載の液晶表示装置。
- 上記データ信号配線と上記共有配線とは、上記アクティブマトリクス基板上の同層に形成されていることを特徴とする請求項3に記載の液晶表示装置。
- 上記第1供給配線、上記第2供給配線、上記共有配線は、それぞれ絶縁膜を介して異なる層に形成されており、
上記共有配線は、上記第1供給配線または上記第2供給配線との交点においてコンタクトホールを介して電気的に接続されていることを特徴とする請求項3または4に記載の液晶表示装置。 - 電圧無印加時に液晶分子の配列が不規則な状態となる第1表示状態と、電圧印加時に液晶分子の配列が規則的な状態となる第2表示状態となる光拡散型液晶を封入してなる表示装置に備えられたアクティブマトリクス基板において、
表示すべき画像を表す複数の映像信号をそれぞれ伝達するための複数のデータ信号配線と、
上記複数のデータ信号配線と交差する複数の走査信号配線と、
上記複数のデータ信号配線と上記複数の走査信号配線との交差点にそれぞれ対応してマトリクス状に配置された画素電極と、
上記画素電極毎に設けられ、上記データ信号配線によって伝達される映像信号に基づいて、上記第1表示状態を実現するための第1表示データを、第1供給配線を介して取り込むと共に、上記第2表示状態を実現するための第2表示データを、第2供給配線を介して取り込み、それぞれのデータを記憶する表示データ記憶回路とが形成され、
上記データ信号配線が形成される領域は、上記アクティブマトリクス基板上であって、画素電極形成面よりも下層の面に隣接画素電極間の間隙を投影して得られる領域のうち、上記走査信号配線と直交する領域と重ならない領域であり、
上記走査信号配線と直交する領域には、上記表示データ記憶回路に接続された第1供給配線または第2供給配線の何れか一方に電気的に接続された共有配線が形成されていることを特徴とするアクティブマトリクス基板。 - 上記データ信号配線と上記共有配線とは同層に形成されていることを特徴とする請求項6に記載のアクティブマトリクス基板。
- 上記共有配線は、メタル配線からなることを特徴とする請求項6または7に記載のアクティブマトリクス基板。
- 請求項1~5の何れか1項に記載の液晶表示装置を備えた電子機器。
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CN2009801314925A CN102124404B (zh) | 2008-09-24 | 2009-05-28 | 液晶显示装置、有源矩阵基板以及电子设备 |
BRPI0919823A BRPI0919823A2 (pt) | 2008-09-24 | 2009-05-28 | dispositivo de visor de cristal líquido, substrato de matriz ativa, e dispositivo eletrônico |
JP2010530763A JP5290307B2 (ja) | 2008-09-24 | 2009-05-28 | 液晶表示装置、アクティブマトリクス基板、電子機器 |
US13/059,775 US8421726B2 (en) | 2008-09-24 | 2009-05-28 | Liquid crystal display device, active matrix substrate, and electronic device |
EP09815965A EP2328013B1 (en) | 2008-09-24 | 2009-05-28 | Liquid crystal display device, active matrix substrate, and electronic device |
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WO2012090803A1 (ja) * | 2010-12-28 | 2012-07-05 | シャープ株式会社 | 液晶表示装置 |
WO2012147662A1 (ja) * | 2011-04-27 | 2012-11-01 | シャープ株式会社 | 液晶表示装置及びその駆動方法 |
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2011077825A1 (ja) * | 2009-12-24 | 2011-06-30 | シャープ株式会社 | 液晶表示装置、液晶表示装置の駆動方法並びに電子機器 |
JPWO2011077825A1 (ja) * | 2009-12-24 | 2013-05-02 | シャープ株式会社 | 液晶表示装置、液晶表示装置の駆動方法並びに電子機器 |
WO2012090803A1 (ja) * | 2010-12-28 | 2012-07-05 | シャープ株式会社 | 液晶表示装置 |
WO2012147662A1 (ja) * | 2011-04-27 | 2012-11-01 | シャープ株式会社 | 液晶表示装置及びその駆動方法 |
CN110506308A (zh) * | 2017-03-30 | 2019-11-26 | 夏普株式会社 | 显示装置 |
CN110506308B (zh) * | 2017-03-30 | 2021-07-23 | 夏普株式会社 | 显示装置 |
Also Published As
Publication number | Publication date |
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CN102124404B (zh) | 2013-03-13 |
EP2328013A1 (en) | 2011-06-01 |
EP2328013B1 (en) | 2013-03-27 |
US8421726B2 (en) | 2013-04-16 |
US20110141096A1 (en) | 2011-06-16 |
CN102124404A (zh) | 2011-07-13 |
JP5290307B2 (ja) | 2013-09-18 |
JPWO2010035548A1 (ja) | 2012-02-23 |
BRPI0919823A2 (pt) | 2016-04-05 |
RU2462738C1 (ru) | 2012-09-27 |
EP2328013A4 (en) | 2012-02-22 |
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