WO2020130093A1 - Dispositif d'affichage - Google Patents

Dispositif d'affichage Download PDF

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Publication number
WO2020130093A1
WO2020130093A1 PCT/JP2019/049918 JP2019049918W WO2020130093A1 WO 2020130093 A1 WO2020130093 A1 WO 2020130093A1 JP 2019049918 W JP2019049918 W JP 2019049918W WO 2020130093 A1 WO2020130093 A1 WO 2020130093A1
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Prior art keywords
pixel
display
sub
unit
display device
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PCT/JP2019/049918
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English (en)
Japanese (ja)
Inventor
昌哉 玉置
水橋　比呂志
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株式会社ピクトリープ
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Publication of WO2020130093A1 publication Critical patent/WO2020130093A1/fr

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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
    • 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
    • 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
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • 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
    • G02F1/1343—Electrodes
    • 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
    • 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
    • G02F1/1368—Active matrix addressed cells in which the switching element is a three-electrode device
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/302—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements characterised by the form or geometrical disposition of the individual elements
    • 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

Definitions

  • Embodiments of the present disclosure relate to a display device.
  • MIP Memory-in-Pixel
  • IOT Internet of Things
  • one pixel or sub-pixel is divided into a plurality of display regions (segments) having different areas, and gradation display is performed by a combination of ON and OFF of these regions.
  • the so-called area gradation method for realizing the above is adopted.
  • pixels or sub-pixel electrodes are divided according to the number of bits to be displayed. Specifically, when displaying n bits, a pixel or subpixel electrode is generally divided into n segments having an area ratio of 1, 2,... 2 ⁇ (n ⁇ 1). .. Each segment has a corresponding memory unit, can hold data, and can perform gray scale display of 2 nth power by switching white and black display of each region. For example, in the case of 2 bits, in a segment having an area ratio of 1:2, 2 squares, that is, in the case where 4 gradations have an area ratio of 1:2:4 in the case of 3 bits, 2 It is possible to express the third power of, that is, eight different gradations.
  • An object of the present disclosure is to provide a means for reducing the load on the manufacturing process and performing area gray scale display having sufficient gray scale representation in a display device having pixels including three sub-pixels. ..
  • a display device includes a plurality of unit pixels that are arranged adjacent to each other, and the unit pixels are three sub-pixels that are arranged adjacent to each other and display different colors.
  • the three sub-pixels are each a display device having N display areas, and are capable of performing an area gradation display of N bits for each color by combining the display areas.
  • the display area corresponding to the least significant bit is rectangular, and the least significant bit display area of the sub-pixel that displays one color in one unit pixel is provided in either the same unit pixel or the adjacent unit pixel.
  • the least significant bit display area of the subpixel of the unit pixel which is in contact with the least significant bit display area of the subpixel which displays the other two colors, It is arranged so as not to contact the display area corresponding to the upper bits of the pixel.
  • the area gradation method when the area gradation method is applied to a pixel configuration using, for example, three RGB sub-pixels, gradation expression with sufficient characteristics can be provided without increasing the load on the manufacturing process. it can.
  • at least one of the sub-pixels included in the unit pixel has a different shape from the other two, and one side of the unit pixel is shared by the three sub-pixels.
  • the unit pixel is rectangular as a whole. This makes it possible to solve the problems of the conventional known examples.
  • the display device intends to perform a semi-transmissive display, by providing a transmissive electrode having the same ratio as the area ratio of the reflective electrode, it is equivalent to the reflective display and a good floor in the transmissive display. A tonal image can be displayed.
  • the display device is provided with an interface that adjusts the input order of the data signals input to the segments, so that the RGB signals sent in the normal arrangement are directly received and the display device according to the pixel shape is received. Since the signals can be appropriately converted internally, it is possible to provide a means that does not impose a special load on the processor outside the display device.
  • FIG. 1 is a schematic view showing a cross section of a liquid crystal display device.
  • FIG. 2 is a schematic diagram of the entire LTPS active matrix type TFT drive circuit.
  • FIG. 3 is a schematic circuit diagram of a pixel portion of the MIP method.
  • FIG. 4 is a diagram for explaining a conventionally known example of the area gradation method.
  • FIG. 5 is a diagram illustrating the unit pixel PX according to the first embodiment of the present disclosure.
  • the unit pixel PX according to the derivative form 1 of the first embodiment of the present disclosure will be described with reference to FIG. 6.
  • the unit pixel PX according to the derivative form 2 of the first embodiment of the present disclosure will be described with reference to FIG. 7.
  • FIG. 11 shows the configuration of the pixel electrode in the case of the semi-transmissive liquid crystal display device of the present disclosure.
  • FIG. 12 shows a conventionally known example for explaining the data signal transmission order.
  • FIG. 13 is a schematic diagram for explaining a data signal transmission order of the present disclosure.
  • FIG. 14 shows a data control circuit and a timing chart for a conventional pixel array.
  • FIG. 15 shows a data control circuit configuration for the pixel array disclosed in the present disclosure.
  • a specific example of an electronic device using the display device of the present embodiment will be described with reference to FIG. 16.
  • FIG. 17 a specific example of an electronic device using the display device of this embodiment will be described.
  • a liquid crystal display device is disclosed as an example of the display device.
  • This display device can be applied to various devices such as a smartphone, a tablet terminal, a mobile phone terminal, a personal computer, a television receiver, an in-vehicle device, and a game machine.
  • the main configuration disclosed in the present embodiment can be applied to a display device having an area gradation display means other than the liquid crystal display device.
  • Liquid crystal display device to which the present disclosure is applied 1-1.
  • Drive circuit configuration 1-3.
  • the liquid crystal display device can be classified into a transmissive type, a reflective type, and a semi-transmissive type when classified according to the display form.
  • the technique of the present disclosure is applicable to a transmissive liquid crystal display device, but in practice, Is mainly applied to reflective and semi-transmissive liquid crystal display devices, and desirable results can be obtained.
  • the liquid crystal display device according to the present disclosure is an electronic device, in particular, a portable electronic device that is frequently used outdoors, that is, a mobile terminal device, for example, a mobile information device such as a digital camera or a mobile communication device such as a mobile phone. It is preferable to use it as a display part of.
  • a liquid crystal display device to which the present disclosure is applied includes a plurality of sub-pixels (sub-pixels) in one pixel (unit pixel) which is a unit for forming a color image. More specifically, in a display device compatible with color display, the unit pixel includes, for example, a sub-pixel that displays red (Red:R), a sub-pixel that displays green (Green:G), and a blue (Blue:B). Includes three sub-pixels for displaying However, the three sub-pixels are not limited to the three primary colors of RGB, and may be combinations such as cyan, magenta, and yellow. In any case, when the area gradation display is performed by the pixel including the three sub-pixels. Can be applied in.
  • FIG. 1 is a cross-sectional view showing a configuration example of the display device according to the embodiment.
  • the display device 13 includes a first panel 15, a second panel 14, and a liquid crystal layer 16.
  • the second panel 14 is arranged so as to face the first panel 15.
  • the liquid crystal layer 16 is provided between the first panel 15 and the second panel 14.
  • the surface of the second panel 14 is a display surface 1a for displaying an image. Light incident from the outside on the display surface 1a side is reflected by the pixel electrode 10 of the first panel 15 and emitted from the display surface 1a. Further, the light emitted from the backlight unit 20 and incident from the first panel 15 side is also emitted from the display surface 1a.
  • the display device 13 of the present embodiment is a semi-transmissive liquid crystal display device that displays an image on the display surface 1a using the reflected light and the transmitted light from the backlight.
  • the direction parallel to the display surface 1a is the X direction
  • the direction intersecting the X direction on the surface parallel to the display surface 1a is the Y direction
  • the direction perpendicular to the display surface 1a is the Z direction.
  • the first panel 15 has a first substrate 12, an insulating layer 11, a pixel electrode 10, and an alignment film 9. Further, the transflective and transmissive liquid crystal display device has a quarter-wave plate 17, a half-wave plate 18, and a polarizing plate 19.
  • the first substrate 12 for example, a glass substrate or a resin substrate is used.
  • circuit elements (not shown) and various wirings such as gate wirings and signal wirings are provided.
  • the circuit element includes a capacitive element and a switching element such as a TFT (Thin Film Transistor).
  • the TFT may be formed of any of amorphous silicon (Amorphous Si), low temperature polysilicon LTPS (Low Temperature Poly Si), transparent amorphous oxide semiconductor TAOS (Transparent Amorphous Oxide Semiconductor), and the like.
  • the insulating layer 11 is provided on the first substrate 12 and has a function of flattening the surfaces of circuit elements and various wirings.
  • the pixel electrode 10 is provided on the insulating layer 11, and the alignment film 9 is provided between the pixel electrode 10 and the liquid crystal layer 16.
  • the pixel electrode 10 may have a configuration in which a metal such as aluminum (Al) or silver (Ag), or a metal material thereof and a translucent conductive material such as ITO (Indium Tin Oxide) are used together.
  • the metal material portion of the pixel electrode 10 functions as a reflection plate that reflects light incident from the outside.
  • the light reflected by the pixel electrode 10 travels in a certain direction toward the display surface 1a side.
  • the pixel electrode 10 is provided corresponding to each sub-pixel of R (red), G (green), and B (blue), and the liquid crystal layer 16 is changed by changing the voltage level applied to the pixel electrode 10. Changes the retardation at, and as a result, the light transmission state is adjusted for each sub-pixel. That is, the pixel electrode 10 also has a function as a pixel electrode.
  • the pixel electrode 10 and the insulating layer 11 are shown to be flat in FIG. 1, the surface of the insulating layer 11 may be uneven so as to be diffused and reflected.
  • the second panel 14 includes a second substrate 4, a color filter 5, an overcoat 6, a common electrode 7, an alignment film 8, a quarter wave plate 3, a half wave plate 2, and a polarizing plate 1.
  • Including and A color filter 5, an overcoat 6, and a common electrode 7 are provided on the surface of the second substrate 4 facing the first panel 15.
  • An alignment film 8 is provided between the common electrode 7 and the liquid crystal layer 16.
  • the quarter-wave plate 3, the half-wave plate 2, and the polarizing plate 1 are provided in this order on the surface of the second substrate 4 on the display surface 1a side.
  • the condition of the broadband circular polarizing plate made up of the combination of the quarter-wave plate 3 and the half-wave plate 2 is illustrated, but the configuration of only the quarter-wave plate 3 is also possible. I do not care.
  • an isotropic or anisotropic diffusion layer is provided at a position adjacent to any one of the quarter wave plate 3, the half wave plate 2 and the polarizing plate 1. It may be one that has been submitted.
  • the second substrate 4 is a glass substrate or a resin substrate, and the common electrode 7 is formed of a translucent conductive material such as ITO.
  • the common electrode 7 is arranged to face the plurality of pixel electrodes 10 and supplies a common potential to each sub-pixel.
  • the color filter 5 has, for example, three filters of R (red), G (green), and B (blue), but may include four or more different color filters.
  • the overcoat 6 is a flat insulating layer and is provided on the liquid crystal layer 16 side of the color filter 5.
  • the liquid crystal layer 16 is, for example, a nematic liquid crystal enclosed in a liquid crystal cell.
  • the retardation of each sub-pixel is modulated by changing the voltage level between the common electrode 7 and the pixel electrode 10, and as a result, the light of each sub-pixel is modulated.
  • Incident light entering from the display surface 1a side of the display device 13 passes through the second panel 14 and the liquid crystal layer 16 and reaches the pixel electrode 10. Then, the incident light is reflected by the pixel electrode 10. The light reflected by the pixel electrode 10 passes through the liquid crystal layer 16, is modulated for each sub-pixel, and is emitted from the display surface 1a. As a result, the image is displayed.
  • the backlight unit 20 used in the case of a transflective or transmissive liquid crystal display device is an illumination unit that illuminates the liquid crystal display panel from the back side thereof, that is, the side opposite to the liquid crystal layer 16 of the first panel unit 15. is there.
  • a light source such as an LED (Light Emitting Diode) or a fluorescent tube
  • well-known members such as a prism sheet, a diffusion sheet, and a light guide plate. And can be used.
  • LTPS Low Temperature Poly Si
  • TFT Thin Film Transistor
  • the liquid crystal display device 13 has a configuration including a pixel array section 30 in which pixels 21 are two-dimensionally arranged in a matrix, and a drive section arranged around the pixel array section 30. ..
  • the drive unit includes a signal output circuit 35, a scanning circuit 40, a drive timing generation unit 45, and the like.
  • the drive unit is integrated on the same liquid crystal display panel (substrate) 11 as the pixel array unit 30.
  • Each pixel 21 is driven.
  • one unit pixel is composed of three sub-pixels, and each of these sub-pixels corresponds to the pixel 21. Therefore, in the configuration described below, the “sub-pixel” in the unit pixel is simply described as a “pixel”.
  • signal lines 31-1 to 31-n (hereinafter, may be simply referred to as “signal line 31”) along the column direction with respect to the m-row by n-column pixel array of the pixel array unit 30.
  • signal line 31 is wired for each pixel column.
  • scanning lines 32-1 to 32-m (hereinafter, sometimes simply referred to as “scanning line 32”) are arranged along the row direction for each pixel row.
  • the “column direction” refers to the arrangement direction of pixels in a pixel column
  • the “row direction” refers to the arrangement direction of pixels in a pixel row.
  • Each end of the signal line 31 (31-1 to 31-n) is connected to each output end corresponding to the pixel column of the signal line drive unit 35.
  • the signal line drive unit 35 operates so as to output a signal potential reflecting a predetermined gradation to the corresponding signal line 31.
  • the signal line driving unit 35 operates so as to output a signal potential reflecting a required gradation to the corresponding signal line 31 when the logic level of the signal potential held in the pixel 21 is exchanged.
  • the scanning lines 32-1 to 32-m are shown as one wiring for one row of pixels, but actually, the number of scanning lines proportional to the number of bits is arranged.
  • One end of each of the scanning lines 32-1 to 32-m is connected to each output end corresponding to the pixel row of the scanning line driving unit 40.
  • a drive timing generation unit (TG; timing generator) 45 generates various drive pulses (timing signals) for operating the signal line drive unit 35 and the scanning line drive unit 40, and supplies these to the drive units 35 and 40.
  • the display device of the present disclosure is a display device in which pixels having a memory function are arranged.
  • a so-called MIP (Memory-in-Pixel) type liquid crystal display device having a memory unit capable of storing data in a pixel can be exemplified.
  • the idea of the present disclosure can be applied to a display device that uses a material having a memory property such as a ferroelectric liquid crystal, but in the following, the application to a MIP type liquid crystal display device is considered first. And explain.
  • one pixel (unit pixel) that is a unit for forming a color image has a configuration including three sub-pixels, for example, R (red) G (green) B (Blue) It consists of three primary colors.
  • the sub-pixel is further divided into a plurality of segments (display areas) according to the number of display bits, and in a segment corresponding to 1 bit, only two gradations of black and white are displayed. It is not possible to perform key expression. Therefore, as a gradation expression method, an area gradation method is used in which one subpixel is divided into a plurality of segments and gradation is displayed by a combination of areas of the plurality of segments.
  • the “area gradation method” is, as an example, N number of segments, that is, divided electrodes, in which the area ratio is weighted as 2 0 , 2 1 , 2 2 ,..., 2 N ⁇ 1 .
  • This is a gradation expression method for expressing 2N gradations.
  • the electrode of one sub-pixel when the electrode of one sub-pixel is divided into a plurality of electrodes, the electrode of one sub-pixel is divided into, for example, two segments having different areas, and a segment having a small area is set as the minimum bit. It is possible to adopt a configuration in which a segment having a size twice as large as the area of the segment for displaying the smallest bit is the next bit, and by combining two segments, gradation display is made for the largest bit.
  • Each segment serves as an electrode, and the liquid crystal layer is also controlled according to the controlled potential based on the information stored in the memory. As a result, each segment has either a white or a black binary state.
  • FIG. 3 is a block diagram showing an example of a circuit configuration of each segment in subpixels forming a pixel in a MIP display device.
  • the liquid crystal capacitance 22 is the capacitance component of the liquid crystal material generated between the pixel electrode and the counter electrode formed facing the pixel electrode.
  • a common voltage Vcom is applied to the counter electrode of the liquid crystal capacitor 22 commonly to all pixels.
  • a pixel configuration with an SRAM (Static Random Access Memory) having three switch elements 23 to 25 and a latch section 26 is provided.
  • One end of the switch element 25 is connected to a signal line 31.
  • Data is supplied from the signal line driving unit 35 through the signal line 31 by being supplied with a scanning signal from the scanning line driving unit 40 through the scanning line 32 in FIG.
  • the latch unit 26 is composed of inverters 27 and 28 connected in parallel in opposite directions to each other, and holds (latches) a potential according to the data SIG taken in by the switch element 25.
  • a potential V1 having the same phase as the common voltage Vcom and a potential XV1 having the opposite phase to the common voltage Vcom are applied to one terminal of each of the switch elements 23 and 24.
  • the other terminals of the switch elements 23 and 24 are commonly connected and serve as the output node Nout of the pixel circuit.
  • One of the switch elements 23 and 24 is turned on according to the polarity of the holding potential of the latch section 26.
  • the in-phase potential V1 or the anti-phase potential XV1 is applied to the pixel electrode of the liquid crystal capacitance 21 to which the common voltage Vcom is applied to the counter electrode, and white or black is displayed depending on the liquid crystal mode. It At the time of displaying a still image, since the information held in the latch unit 26 is used, it is not necessary to perform the write operation of the signal potential in the polarity inversion cycle of the liquid crystal layer, which has an advantage that power consumption can be reduced.
  • the SRAM Static Random Access Memory
  • the latch unit 26 that holds the potential according to the display data is arranged in a matrix. It is arranged.
  • the SRAM Static Random Access Memory
  • the case where the SRAM is used as the built-in memory unit is taken as an example, but the SRAM is only an example, and a configuration using a memory unit having another configuration, for example, a DRAM (Dynamic Random Access Memory) is used. It doesn't matter.
  • FIG. 4 In order to facilitate understanding, a conventionally known example is shown in FIG. 4 and its problems are explained. Specifically, an area gray scale method in which 4 gray scales are expressed by 2 bits by a segment obtained by dividing the area of one sub-pixel with a weight of 2:1 will be described as an example. Then, the configuration of the pixel according to the embodiment of the present disclosure will be described with reference to FIGS. 5 to 10.
  • FIG. 4A shows a representative example of a conventionally known example in which a subpixel is divided into two. Taking a sub-pixel displaying red (R) as an example, it is divided into two into a lower bit segment PR1 and an upper bit segment PR2 at an area ratio of 1:2.
  • FIG. 4B shows a state in which the arranged pixels of FIG. 4A show different gradations L0, L1, L2, and L3. Here, in all segments, L0 indicates a black state and L3 indicates a white state.
  • FIG. 4C shows an example in which the sub-pixel is divided into three among the conventionally known examples.
  • the lower-bit segment PR1 and the upper-bit segment PR2 each have an area ratio of 1:2.
  • PR2 is further divided into two.
  • the adjacent pixels of the L1 and L2 gradations can be distinguished from the pixels of the L0 gradation, so that the problem of gradation display can be solved.
  • a so-called multi-layer wiring structure has been proposed in which one layer of insulating layer is added more than usual and connected with new wiring, but the problem of increasing the load on the manufacturing process Are listed.
  • FIG. 5(A) shows a configuration of a unit pixel PX according to the first embodiment of the present disclosure, which solves the problem of the above-described conventionally known example.
  • the unit pixel PX has three adjacent subpixels, a subpixel PG that displays green (G), a subpixel PR that displays red (R), and a subpixel PB that displays blue (B). Color filters of colors corresponding to PG, PR, and PB are arranged to face the respective pixel electrodes.
  • the unit pixel PX having a square shape is composed of subpixels having different shapes.
  • the subpixel PG is a vertically long rectangle extending in the Y-axis direction, and the subpixel PR.
  • the sub-pixel PB is a horizontally long rectangle extending in the X-axis direction.
  • the sub-pixel displaying green (G) is selected as a vertically long rectangle, but red (R) and blue (B) may be arranged instead.
  • each sub-pixel has two segments with different areas to perform area gradation.
  • the sub-pixel PG is the first segment PG1 having a small area and the second segment PG2 having a large area
  • the sub-pixel PR is the first segment PR1 and the second segment PR2
  • the sub-pixel PB is the first segment. It has a segment PB1 and a second segment PB2, respectively.
  • the area ratio of the first segment to the second segment is 1:2, and these two segments are combined so that the first segment is the low-order bit and the second segment is the high-order bit.
  • FIG. 5B is a diagram showing a state of gradation display according to the first embodiment of the present disclosure.
  • L0 to L3 each represent a gradation value, which means that the brightness increases in this order.
  • the gradation value L0 is black in all the segments of the unit pixel PX
  • the gradation value L1 is white in the segments PG1, PR1, PB1 and the rest is black
  • the gradation value L2 is in the segments PG2, PR2, PB2. Is white and the rest is black
  • the gradation value L3 is in a state in which all the segments of the unit pixel PX display white.
  • the state in which the "segment displays black” here means that the segment is off, and in the case of a reflective liquid crystal display device, the light reflected by the reflective electrode cannot go out of the display device. Equivalent to.
  • the state in which the "segment displays white” corresponds to the state in which the segment is on, and the state in which the light reflected on the electrode passes through the corresponding color filter layer and exits.
  • the segments in the sub-pixels PR, PG, and PB are interlocked with each other and described in the same state, but the states can be changed independently in each sub-pixel.
  • the sub-pixel PG has a vertically long rectangle extending in the Y-axis direction
  • the sub-pixels PR and PB have a horizontally-long rectangle extending in the X-axis direction. Is common, but differs in that the lower-order bit segments PR1, PG1, and PB1 are more elongated rectangles.
  • FIGS. 6B and 7B since the adjacent pixels of L1 and L2 gradations can be distinguished from the pixels of L0 gradations, the problem of gradation display described above should be solved. Can be done.
  • the sub-pixel displaying green (G) is selected as a vertically long rectangle, but red (R) and blue (B) may be arranged instead.
  • FIG. 8 shows a derivative form 3 of the first embodiment of the present disclosure.
  • the unit pixel PX is a square
  • two sub-pixels, here, PR and PG are L-shaped
  • the remaining sub-pixel PB is a vertically long rectangle.
  • the lower-bit segments PR1, PG1, and PB1 are arranged so as to be sandwiched by the upper-bit segments PR2, PG2, and PB2. It is possible to avoid the problem of gradation display due to.
  • FIG. 9 shows a derivative form 4 of the first embodiment of the present disclosure.
  • the unit pixel PX is a square, and includes two L-shaped sub-pixels (here, PR and PB) and the remaining rectangular sub-pixels (here, PG).
  • the difference from the pixel of FIG. 8 is that a rectangular sub-pixel is surrounded by two L-shaped sub-pixels and does not contact adjacent pixels.
  • FIG. 9B since the lower-bit segments PR1, PG1, and PB1 do not contact adjacent pixels, it is possible to avoid the problem of gradation display.
  • FIG. 10 shows a second embodiment of the present disclosure.
  • the unit pixel PX is composed of rectangular sub-pixels PR, PG, and PB, and the lines connecting the respective center points are arranged in a delta array in which the lines are triangular.
  • FIG. 10B since the lower-bit segments PR1, PG1, and PB1 are arranged so as to be sandwiched by the upper-bit segments PR2, PG2, and PB2, gradation display due to the influence of adjacent pixels is displayed. It is possible to avoid the problem of.
  • FIG. 11 illustrates a configuration of a pixel electrode in the case of a semi-transmissive liquid crystal display device as one embodiment of the present disclosure.
  • FIG. 11A shows the configuration of the first embodiment shown in FIG. 5, in which PG1_T, PG2_T, PR1_T, PR2_T, PB1_T, PB2_T are transparent transparent electrodes, PG1_R, PG2_R, PR1_R, PR2_R, PB1_R, and PB2_R represent reflective metal electrodes.
  • the transparent electrode and the reflective metal electrode in one segment are electrically connected to each other with some overlap at the ends, and the potential is changed in conjunction with the electric signal supplied from one contact hole CH, Controls the liquid crystal layer.
  • both the transparent electrode portion and the reflective metal electrode portion are 1 By dividing at a ratio of :2, it is possible to perform desired gradation display that works in both transmissive display and reflective display.
  • a semi-transmissive liquid crystal display device is used.
  • the above embodiments can be adopted. That is, the transparent electrode and the reflective metal electrode in one segment are electrically connected to each other with some overlap at the end, and the potential changes in conjunction with the electric signal supplied from one contact hole CH. Then, the liquid crystal layer is controlled.
  • the pixel configurations of the first and second embodiments of the present disclosure are not limited to the transflective liquid crystal display device, and may be applied to a reflective liquid crystal display device.
  • FIG. 12 is a conventionally known example illustrated for comparison
  • FIG. 13 is an example illustrating the case of the embodiment of the present disclosure, and representatively illustrates the case of the first embodiment.
  • Each segment has a corresponding memory circuit unit 50, and data is exchanged through the signal line 31 when the scanning line 32 is controlled to be open.
  • FIG. 12A In the case of a conventionally known example, as shown in FIG. 12A, upper bit and lower bit segments of the same color are arranged in the Y-axis direction, that is, in the direction parallel to the signal line 31, and the memory circuit unit corresponding to each segment. 50 is also arranged in the same order. Therefore, as shown in FIG. 12B, the data signal 51 is sequentially sent through one signal line, such as data RL for lower bits and data RH for higher bits of the same color.
  • the upper-bit and lower-bit segments of the same color are not necessarily aligned in the Y-axis direction, that is, parallel to the signal line 31.
  • the corresponding memory circuit section 50 is also the same. Has become. Therefore, as for the data signal 52, as shown in FIG. 13B, it is necessary to send data of subpixels of different colors through one signal line.
  • FIG. 14 shows a data control circuit configuration for a pixel array.
  • the shift register SR is synchronized so that the image signals sent to the display device as serial data are sequentially stored in the memory holding unit LAT1. To operate. When the data storage for one row of the display device is completed, the data is collectively written to the next second memory holding unit LAT2. Therefore, the potential is adjusted to a predetermined value, and then information is written to the memory in the segment in the sub-pixel that constitutes the pixel.
  • a timing chart of the above circuit operation is shown in FIG.
  • FIG. 16 shows an example in the case of a notebook computer, which uses the display device of the present embodiment to ensure a certain level of image quality and is significantly lower than when a conventional transmissive liquid crystal display is used. It becomes possible to realize power consumption.
  • the tablet shown in FIG. 17 as well, because it is portable, it is desirable to reduce power consumption for long-term use. Even in this case, by adopting the display device of this embodiment for the screen SCR, It is possible to bring out a remarkable effect.
  • Pixel Electrode 11 Insulating Layer 12 First Substrate 13 Display Device 14 Second Panel 15 First panel 16 Liquid crystal layer 17 1/4 wave plate 18 1/2 wave plate 19 Polarizing plate 20 Back light part 21 Pixel 22 Liquid crystal capacitors 23, 24, 25 Switch element 26 Latch part 27, 28 Inverter 30 Pixel array part 31 signal line 32 scanning line 35 signal output circuit 40 scanning circuit 45 drive timing generation unit 50 memory circuit unit 51, 52 data signal Vcom voltage V1, XV1 potential Nout output node PR1, PG1, PB1 lower bit segment PR2, PG2, PB2 Lower bit segment L0, L1, L2, L3 Gray scale PX Unit pixel PR, PG, PB Subpixel PG1_T, PG2_T, PR1_T, PR2_T, PB1_T, PB2_T Transparent transparent electrode PG1_R, PG2_R, PR1_R, PR

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Abstract

La présente invention aborde le problème de réalisation d'une présentation de modulation de zone qui réduit la charge sur un processus de production et exprime suffisamment la modulation.　L'invention concerne un dispositif d'affichage qui comprend une pluralité de pixels unitaires mutuellement adjacents (PX) et dans lequel le pixel unitaire comprend trois sous-pixels mutuellement adjacents (PR, PG, PB) qui présentent des couleurs différentes et chacun des trois sous-pixels comprend N régions d'affichage, une combinaison des régions d'affichage permettant une modulation de zone à N bits ; la région d'affichage de bits les moins significatifs correspondant au bit le moins significatif dans la région d'affichage est en forme de carré ; la région d'affichage de bits les moins significatifs pour un sous-pixel qui affiche une couleur dans un pixel unitaire est agencée en contact avec la région d'affichage de bits les moins significatifs pour des sous-pixels disposés soit dans le même pixel unitaire soit dans un pixel unitaire adjacent et affichant deux autres couleurs ; et la région d'affichage de bits les moins significatifs pour le sous-pixel dans le pixel unitaire n'est pas en contact avec la région d'affichage de bit supérieur correspondant à un bit supérieur pour le sous-pixel ayant la même couleur dans le pixel unitaire adjacent.
PCT/JP2019/049918 2018-12-21 2019-12-19 Dispositif d'affichage WO2020130093A1 (fr)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6361890U (fr) * 1986-10-09 1988-04-23
JP2001042790A (ja) * 1999-07-30 2001-02-16 Seiko Epson Corp 表示装置
JP2002251160A (ja) * 2000-10-27 2002-09-06 Matsushita Electric Ind Co Ltd 表示装置
JP2002333870A (ja) * 2000-10-31 2002-11-22 Matsushita Electric Ind Co Ltd 液晶表示装置、ｅｌ表示装置及びその駆動方法、並びに副画素の表示パターン評価方法
US20110216259A1 (en) * 2010-03-05 2011-09-08 Samsung Electronics Co., Ltd. Display panel
JP2017107175A (ja) * 2015-12-01 2017-06-15 株式会社ジャパンディスプレイ 表示装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6361890U (fr) * 1986-10-09 1988-04-23
JP2001042790A (ja) * 1999-07-30 2001-02-16 Seiko Epson Corp 表示装置
JP2002251160A (ja) * 2000-10-27 2002-09-06 Matsushita Electric Ind Co Ltd 表示装置
JP2002333870A (ja) * 2000-10-31 2002-11-22 Matsushita Electric Ind Co Ltd 液晶表示装置、ｅｌ表示装置及びその駆動方法、並びに副画素の表示パターン評価方法
US20110216259A1 (en) * 2010-03-05 2011-09-08 Samsung Electronics Co., Ltd. Display panel
JP2017107175A (ja) * 2015-12-01 2017-06-15 株式会社ジャパンディスプレイ 表示装置

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