WO2023140216A1 - Display device - Google Patents

Display device Download PDF

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Publication number
WO2023140216A1
WO2023140216A1 PCT/JP2023/000968 JP2023000968W WO2023140216A1 WO 2023140216 A1 WO2023140216 A1 WO 2023140216A1 JP 2023000968 W JP2023000968 W JP 2023000968W WO 2023140216 A1 WO2023140216 A1 WO 2023140216A1
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WO
WIPO (PCT)
Prior art keywords
segment
light emitting
area
display device
emitting elements
Prior art date
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PCT/JP2023/000968
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French (fr)
Japanese (ja)
Inventor
隆 大田
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株式会社ジャパンディスプレイ
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Publication of WO2023140216A1 publication Critical patent/WO2023140216A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • 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
    • G02F1/1336—Illuminating devices
    • 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
    • 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
    • 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
    • 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

Definitions

  • the embodiments of the present invention relate to display devices.
  • a liquid crystal display device using a liquid crystal panel is known. Due to the display quality of such liquid crystal display devices, there is an increasing demand for higher brightness of lighting devices used in liquid crystal display devices, and direct lighting devices in which a light source is arranged directly below a liquid crystal panel are being studied.
  • This embodiment provides a display device with little light leakage to adjacent segment areas.
  • a display device includes: a lighting device comprising: a plurality of light emitting elements; and a first driving section for driving the plurality of light emitting elements; a display panel comprising a plurality of pixels and a second driving section that drives the plurality of pixels; with The plurality of light emitting elements are divided into a plurality of first segment regions, The plurality of pixels are divided into a plurality of second segment regions, The plurality of light emitting elements are independently driven in units of the first segment regions, The first drive unit outputs a drive signal for controlling lighting and extinguishing of the light emitting element to the first segment region corresponding to the second segment region, The shapes of the first segment area and the second segment area are different.
  • FIG. 1 is an exploded perspective view showing a display device according to this embodiment.
  • FIG. 2A is a plan view illustrating the segment regions of this embodiment.
  • FIG. 2B is a plan view illustrating the segment regions of this embodiment.
  • FIG. 3 is a diagram for explaining overlapping segment regions in this embodiment.
  • FIG. 4A is a diagram illustrating segment regions of a comparative example.
  • FIG. 4B is a diagram illustrating segment regions of a comparative example.
  • FIG. 5 is a diagram illustrating overlapping segment areas SA and PA in a comparative example.
  • FIG. 6 is a diagram showing the segment regions of the comparative example and the present embodiment, and luminance profiles of the light-emitting elements.
  • FIG. 7 is a diagram for explaining overlapping segment regions in this embodiment.
  • 8A is a plan view showing another configuration example of the display device according to the embodiment;
  • FIG. 8B is a plan view showing another configuration example of the display device according to the embodiment;
  • FIG. 9 is a
  • first direction X, the second direction Y, and the third direction Z are orthogonal to each other, but they may intersect at an angle other than 90 degrees.
  • the direction toward the tip of the arrow in the third direction Z is defined as upward or upward, and the direction opposite to the direction toward the tip of the arrow in the third direction Z is defined as downward.
  • the first direction X, the second direction Y, and the third direction Z may also be referred to as the X direction, Y direction, and Z direction, respectively.
  • the second member when “the second member above the first member” and “the second member below the first member” are used, the second member may be in contact with the first member, or may be located apart from the first member. In the latter case, a third member may be interposed between the first member and the second member. On the other hand, when “the second member above the first member” and “the second member below the first member” are used, the second member is in contact with the first member.
  • FIG. 1 is an exploded perspective view showing the display device according to this embodiment.
  • the display device DSP includes a display panel PNL and an illumination device ILD.
  • the display panel PNL is a generally known transmissive or transflective liquid crystal display panel.
  • the display panel PNL has a plurality of pixels PX in the display area DA.
  • the display panel PNL is not limited to a liquid crystal display panel, and may be a display panel that requires a separate light source, such as a MEMS (Micro Electro-Mechanical System) display panel.
  • MEMS Micro Electro-Mechanical System
  • the illumination device ILD is arranged below the display panel PNL to face it.
  • the illumination device ILD emits light towards the display panel PNL.
  • the illumination device ILD functions as a backlight unit.
  • the display panel PNL displays an image by selectively transmitting light from the illumination device ILD.
  • the lighting device ILD includes a wiring board CBS, a plurality of light emitting elements LEM, a driving section DVM, a protective layer OC, a diffusion sheet DFS, and a prism sheet PSM.
  • the wiring board CBS, the plurality of light emitting elements LEM, the protective layer OC, and the prism sheet PSM are laminated in the third direction Z in this order.
  • the wiring board CBS is composed of a printed circuit board (PCB).
  • PCB printed circuit board
  • FPC flexible printed circuit
  • the wiring board CBS has a main surface MSF.
  • a light emitting area LA is provided on the main surface MSF.
  • the light emission area LA faces at least the display area DA of the display panel PNL.
  • a plurality of light emitting elements LEM are provided in the light emitting area LA.
  • the plurality of light emitting elements LEM are arranged in a matrix along the first direction X and the second direction Y. As shown in FIG.
  • the light emitting element LEM is a mini LED (mini light emitting diode).
  • a driving unit DVM for driving the plurality of light emitting elements LEM is mounted on the main surface MSF, outside the light emitting area LA.
  • the light emitting element LEM outputs light of a specific wavelength.
  • the light emitting element LEM has a square shape. However, the shape of the light emitting element LEM may have a shape other than square, such as a rectangle.
  • the length of one side of the light emitting element LEM, which is a mini LED is, for example, more than 100 ⁇ m and less than 300 ⁇ m. The length of one side of the light emitting element LEM which is a mini LED may be more than 100 ⁇ m and 200 ⁇ m or less.
  • the light emitting element LEM may be a micro LED whose longest side is 100 ⁇ m or less as an LED smaller than the mini LED.
  • the light emitting element LEM may be an LED whose longest side is 1 mm or less.
  • the light-emitting element LEM may be an LED having a longest side length of 1000 ⁇ m or more, which is a general LED that is larger than the mini-LED.
  • the length of one side of the light-emitting element LEM, which is the general LED is, for example, 300 ⁇ m or more and 350 ⁇ m or less.
  • the protective layer OC is configured as a light transmission layer that transmits the wavelength of light emitted by the light emitting element LEM.
  • the protective layer OC is made of silicone resin, for example.
  • the protective layer OC may be provided so as to cover the light emitting element LEM.
  • the diffusion sheet DFS has two diffusion sheets DFS1 and DFS2.
  • the number of diffusion sheets is not limited to this.
  • a single diffusion sheet having a predetermined thickness may be provided, or a plurality of diffusion sheets may be laminated.
  • the prism sheet PSM is composed of two orthogonally arranged refractive prism sheets PSM1 and PSM2.
  • the prism sheet PSM may be composed of a total reflection prism sheet instead of the refractive prism sheet PSM1.
  • the total reflection type prism sheet has a simple structure and is excellent in light utilization efficiency and vertical light convergence.
  • the display panel PNL includes a substrate SUB1, a substrate SUB2, a liquid crystal layer LCY, a flexible wiring substrate FC, and a driver IPC.
  • the liquid crystal layer LCY is provided between the substrates SUB1 and SUB2. Between the substrates SUB1 and SUB2, a sealing material (not shown) surrounding the edges of the substrates is provided.
  • the liquid crystal layer LCY is provided inside the area surrounded by the sealing material.
  • the substrate SUB1 has an end Ex that does not overlap with the substrate SUB2.
  • a flexible wiring board FC is provided at the end Ex.
  • a drive unit IPC is connected to the flexible wiring board FC.
  • the drive unit IPC is connected to the pixels PX in the display area DA via the flexible wiring board FC, and drives the pixels PX.
  • An image is displayed in the display area DA by driving the pixels PX.
  • FIG. 2A and 2B are plan views explaining the segment regions of this embodiment. As shown in FIG. 2A, the light emitting area LA is divided into a plurality of segment areas SA.
  • the plurality of segment areas SA are arranged in a matrix in a direction forming 45° with the first direction X and in a direction forming 45° with the second direction Y.
  • the plurality of segment areas SA need not be arranged in a matrix, and may be positioned adjacent to each other.
  • each of the plurality of segment areas SA has one light emitting element LEM.
  • the plurality of light emitting elements LEM are each segmented to form a plurality of segment areas SA.
  • the number of light emitting elements LEM provided in the segment area SA may not be one, and a plurality of light emitting elements LEM may be provided.
  • the light emitting element LEM is provided in the center of the segment area SA.
  • the pitch between adjacent light emitting elements LEM corresponds to the pitch between adjacent segment areas SA.
  • the light-emitting elements LEM provided in segment areas SA different from each other are simultaneously or separately driven on and off by the driving unit DVM.
  • the driving unit DVM can be driven by a technique called local dimming.
  • the local dimming drive the plurality of light emitting elements LEM are independently driven and controlled for each divided area. Only the area of the image that needs to be illuminated is illuminated by the light emitting element LEM, and the area of the image that does not need to be illuminated is not illuminated by the illumination light from the light emitting element LEM. That is, the plurality of light emitting elements LEM are turned on only in areas of the image that need to be illuminated, and the light emitting elements LEM are turned off in areas that do not need to be illuminated. This makes it possible to further increase the contrast ratio of the image displayed on the display panel PNL.
  • a plurality of pixels PX provided in the display area DA are divided into a plurality of segment areas PA.
  • a plurality of pixels PX are provided in one segment area PA.
  • 10 ⁇ 10, that is, 100 pixels PX may be provided in one segment area PA.
  • the number of pixels PX provided in one segment area PA is not limited to this.
  • the segment area SA is the minimum unit in local dimming drive.
  • a group of light-emitting elements LEM arranged in one segment area SA are simultaneously driven to be lit (on state) or extinguished (off state).
  • One segment area SA corresponds to one segment area PA.
  • a group of pixels PX arranged in the segment area PA is illuminated by the group of light emitting elements LEM.
  • the drive unit IPC outputs drive signals to the pixels PX of the segment area PA according to the image displayed in the display area DA.
  • the drive unit DVM outputs a drive signal for controlling lighting and extinguishing of the light emitting element LEM to the segment area SA corresponding to each segment area PA.
  • the drive unit IPC when the image changes, the drive unit IPC outputs a drive signal corresponding to the change.
  • the driving unit DVM outputs a driving signal for controlling lighting and extinguishing of the light emitting element LEM to the corresponding segment area SA according to the change of the image.
  • drive elements may be provided that are connected to the drive units IPC and DVM and output control signals to each.
  • Drive signals for the drive units IPC and DVM are output based on control signals from the drive elements.
  • FIG. 3 is a diagram for explaining overlapping segment regions in this embodiment.
  • the shape of the segment area SA of this embodiment is different from the shape of the segment area PA. Details of FIG. 3 will be described later.
  • FIGS. 4A and 4B are diagrams for explaining segment regions of comparative examples.
  • FIG. 5 is a diagram illustrating overlapping segment areas SA and PA in a comparative example.
  • the segment area SA of the light emitting element LEM and the segment area PA of the pixel PX have the same shape. If the segment areas SA and PA have the same shape, the light from the light emitting elements LEM in one segment area SA may leak not only into the corresponding segment area PA but also into the segment areas PA adjacent to the segment area PA. As a result, the desired display cannot be performed in the adjacent segment area PA.
  • segment areas SA and PA have different shapes, light leakage to the adjacent segment area PA is small. This makes it possible to obtain a display device with improved display quality.
  • Segment area SA has a square shape. Two pairs of opposing sides of the segment area SA are inclined 45° with respect to the first direction X and the second direction Y, respectively.
  • the segment area PA has a rectangular shape with long sides extending along the first direction X and short sides extending along the second direction Y. That is, the shape of the segment area PA is a rectangle elongated in the left and right of the paper surface.
  • the long side of segment area PA has the same length as the diagonal line of segment area SA.
  • the segment area PA covers the segment area SA along the first direction X.
  • part of the segment area PA does not overlap with the segment area SA.
  • the pitches of the segment areas SA in the first direction X and the second direction Y are assumed to be PSx and PSy, respectively.
  • the area of segment area PA is ((PSx) 2 +(PSy) 2 )/2.
  • the area of the segment area PA of the comparative example is PPx ⁇ PPy.
  • the area of the segment area SA is PPx ⁇ PPy.
  • FIG. 6 is a diagram showing the segment regions of the comparative example and the present embodiment, and the luminance profile of the light emitting element.
  • the reference numerals of the segment regions of the comparative example and the present embodiment are changed from those described above.
  • Segment areas SAb and PAb are segment areas SA and PA of a comparative example, and are the same as in FIG.
  • Segment areas SAa and PAa are the segment areas SA and PA of this embodiment, and are the same as in FIG.
  • a profile PF is a luminance profile of light emitted from the light emitting element LEM.
  • segment area PAb of the comparative example illumination is performed using only the light from the area p1.
  • Light from regions p2 and p3 is emitted to segment region PAb adjacent to segment region PAb.
  • the segment area PAa of the present embodiment is illuminated not only by the light of the area p1 but also by the light of the area p2.
  • the light of the area p3 is emitted to the adjacent segment area PAa, it does not affect the display quality because the luminance is low.
  • FIG. 7 is a diagram for explaining overlapping segment regions in this embodiment.
  • the configuration example shown in FIG. 7 is different from the configuration example shown in FIG. 3 in that the segment area PA is a rectangle elongated vertically on the page.
  • the long sides extend along the second direction Y, and the short sides extend along the first direction X.
  • the long side of the segment area PA has the same length as the diagonal line of the segment area SA.
  • ⁇ Configuration example 1> 8A and 8B are plan views showing other configuration examples of the display device according to the embodiment.
  • the configuration examples shown in FIGS. 8A and 8B are different from the configuration example shown in FIG. 3 in that both the segment areas SA and PA are parallelograms in plan view.
  • the segment area SA of this configuration example has a parallelogram shape.
  • a direction tilted clockwise by an angle ⁇ 1 from the first direction X is D1
  • a direction tilted clockwise by an angle ⁇ 2 from the second direction Y is D2.
  • Two pairs of opposing sides of segment area SA extend along directions D1 and D2, respectively. All sides of the segment area SA may have the same length. That is, segment area SA may have a rhombus shape.
  • a plurality of light emitting elements LEM are arranged in a matrix along the directions D1 and D2.
  • the segment area PA has a parallelogram shape.
  • a direction tilted clockwise by an angle ⁇ 3 from the first direction X is D3, and a direction tilted clockwise by an angle ⁇ 4 from the second direction Y is D4.
  • the long sides of the segment area PA extend along the direction D3, and the short sides extend along the direction D4.
  • FIG. 9 is a diagram illustrating overlapping segment areas SA and PA in this configuration example.
  • the long side of segment area PA has the same length as at least one of the diagonal lines of segment area SA.
  • This configuration example also has the same effect as the embodiment.
  • segment areas SA and PA are referred to as first segment area and second segment area, respectively.
  • the drivers DVM and IPC are also referred to as the first driver and the second driver, respectively.
  • DSP...display device DVM...drive section, ILD...illumination device, IPC...drive section, LEM...light emitting element, PA...segment area, PNL...display panel, PPx...pitch, PPy...pitch, PX...pixel, SA...segment area.

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Abstract

The purpose of the present embodiment is to provide a display device with a small amount of light leakage to an adjacent segment area.　The display device according to the present embodiment comprises: a lighting device including a plurality of light emitting elements and a first driving unit which drives the plurality of light emitting elements; and a display panel including a plurality of pixels and a second driving unit which drives the plurality of pixels, wherein the plurality of light emitting elements are divided into a plurality of first segment areas, the plurality of pixels are divided into a plurality of second segment areas, the plurality of light emitting elements are independently driven by units of the first segment areas, the first driving unit outputs driving signals which control to turn on and off the light emitting elements to the first segment areas corresponding to the second segment areas, and the shapes of the first and second segment areas are different.

Description

表示装置Display device
　本発明の実施形態は、表示装置に関する。 The embodiments of the present invention relate to display devices.
　液晶パネルを用いた液晶表示装置が知られている。このような液晶表示装置の表示品位のために、液晶表示装置に用いられる照明装置の高輝度化への要求が高まっており、液晶パネルの直下に光源を配置する直下型照明装置が検討されている。 A liquid crystal display device using a liquid crystal panel is known. Due to the display quality of such liquid crystal display devices, there is an increasing demand for higher brightness of lighting devices used in liquid crystal display devices, and direct lighting devices in which a light source is arranged directly below a liquid crystal panel are being studied.
特開２００６－０３１００４号公報Japanese Patent Application Laid-Open No. 2006-031004 特開２０１０－０８５９４７号公報JP 2010-085947 A
　本実施形態は、隣接するセグメント領域への光漏れが小さい表示装置を提供する。 This embodiment provides a display device with little light leakage to adjacent segment areas.
　一実施形態に係る表示装置は、
　複数の発光素子と、前記複数の発光素子を駆動する第１駆動部と、を備える照明装置と、
　複数の画素と、前記複数の画素を駆動する第２駆動部と、を備える表示パネルと、
　を備え、
　前記複数の発光素子は、複数の第１セグメント領域に区分され、
　前記複数の画素は、複数の第２セグメント領域に区分され、
　前記複数の発光素子は前記第１セグメント領域単位で独立して駆動され、
　前記第１駆動部は、前記第２セグメント領域に対応する前記第１セグメント領域に対して、前記発光素子の点灯及び消灯を制御する駆動信号を出力し、
　前記第１セグメント領域及び前記第２セグメント領域の形状は異なる。 A display device according to one embodiment includes:
a lighting device comprising: a plurality of light emitting elements; and a first driving section for driving the plurality of light emitting elements;
a display panel comprising a plurality of pixels and a second driving section that drives the plurality of pixels;
with
The plurality of light emitting elements are divided into a plurality of first segment regions,
The plurality of pixels are divided into a plurality of second segment regions,
The plurality of light emitting elements are independently driven in units of the first segment regions,
The first drive unit outputs a drive signal for controlling lighting and extinguishing of the light emitting element to the first segment region corresponding to the second segment region,
The shapes of the first segment area and the second segment area are different.
　本実施形態により、隣接するセグメント領域への光漏れが小さい表示装置を提供することができる。 According to this embodiment, it is possible to provide a display device with little light leakage to adjacent segment regions.
図１は、本実施形態に係る表示装置を示す分解斜視図である。FIG. 1 is an exploded perspective view showing a display device according to this embodiment. 図２Ａは、本実施形態のセグメント領域を説明する平面図である。FIG. 2A is a plan view illustrating the segment regions of this embodiment. 図２Ｂは、本実施形態のセグメント領域を説明する平面図である。FIG. 2B is a plan view illustrating the segment regions of this embodiment. 図３は、本実施形態における、重畳するセグメント領域を説明する図である。FIG. 3 is a diagram for explaining overlapping segment regions in this embodiment. 図４Ａは、比較例のセグメント領域を説明する図である。FIG. 4A is a diagram illustrating segment regions of a comparative example. 図４Ｂは、比較例のセグメント領域を説明する図である。FIG. 4B is a diagram illustrating segment regions of a comparative example. 図５は、比較例における、重畳するセグメント領域ＳＡ及びＰＡを説明する図である。FIG. 5 is a diagram illustrating overlapping segment areas SA and PA in a comparative example. 図６は、比較例及び本実施形態のセグメント領域、並びに、発光素子の輝度プロファイルを示す図である。FIG. 6 is a diagram showing the segment regions of the comparative example and the present embodiment, and luminance profiles of the light-emitting elements. 図７は、本実施形態における、重畳するセグメント領域を説明する図である。FIG. 7 is a diagram for explaining overlapping segment regions in this embodiment. 図８Ａは、実施形態における表示装置の他の構成例を示す平面図である。8A is a plan view showing another configuration example of the display device according to the embodiment; FIG. 図８Ｂは、実施形態における表示装置の他の構成例を示す平面図である。8B is a plan view showing another configuration example of the display device according to the embodiment; FIG. 図９は、本構成例における、重畳するセグメント領域を説明する図である。FIG. 9 is a diagram for explaining overlapping segment regions in this configuration example.
　以下に、本発明の各実施の形態について、図面を参照しつつ説明する。なお、開示はあくまで一例にすぎず、当業者において、発明の主旨を保っての適宜変更について容易に想到し得るものについては、当然に本発明の範囲に含有されるものである。また、図面は説明をより明確にするため、実際の態様に比べ、各部の幅、厚さ、形状等について模式的に表される場合があるが、あくまで一例であって、本発明の解釈を限定するものではない。また、本明細書と各図において、既出の図に関して前述したものと同様の要素には、同一の符号を付して、詳細な説明を適宜省略することがある。 Each embodiment of the present invention will be described below with reference to the drawings. It should be noted that the disclosure is merely an example, and those skilled in the art can easily conceive appropriate modifications while keeping the gist of the invention are, of course, included in the scope of the present invention. In addition, in order to make the description clearer, the drawings may schematically show the width, thickness, shape, etc. of each part compared to the actual embodiment, but this is only an example and does not limit the interpretation of the present invention. In addition, in this specification and each figure, the same reference numerals may be given to the same elements as those described above with respect to the existing figures, and detailed description thereof may be omitted as appropriate.
　以下、図面を参照しながら一実施形態に係る表示装置について詳細に説明する。 A display device according to an embodiment will be described in detail below with reference to the drawings.
　本実施形態においては、第１方向Ｘ、第２方向Ｙ、及び、第３方向Ｚは、互いに直交しているが、９０度以外の角度で交差していてもよい。第３方向Ｚの矢印の先端に向かう方向を上又は上方と定義し、第３方向Ｚの矢印の先端に向かう方向とは反対側の方向を下又は下方と定義する。第１方向Ｘ、第２方向Ｙ、及び、第３方向Ｚは、それぞれ、Ｘ方向、Ｙ方向、及び、Ｚ方向と呼ぶこともある。 In this embodiment, the first direction X, the second direction Y, and the third direction Z are orthogonal to each other, but they may intersect at an angle other than 90 degrees. The direction toward the tip of the arrow in the third direction Z is defined as upward or upward, and the direction opposite to the direction toward the tip of the arrow in the third direction Z is defined as downward. The first direction X, the second direction Y, and the third direction Z may also be referred to as the X direction, Y direction, and Z direction, respectively.
　また、「第１部材の上方の第２部材」及び「第１部材の下方の第２部材」とした場合、第２部材は、第１部材に接していてもよく、又は第１部材から離れて位置していてもよい。後者の場合、第１部材と第２部材との間に、第３の部材が介在していてもよい。一方、「第１部材の上の第２部材」及び「第１部材の下の第２部材」とした場合、第２部材は第１部材に接している。 In addition, when "the second member above the first member" and "the second member below the first member" are used, the second member may be in contact with the first member, or may be located apart from the first member. In the latter case, a third member may be interposed between the first member and the second member. On the other hand, when "the second member above the first member" and "the second member below the first member" are used, the second member is in contact with the first member.
　また、第３方向Ｚの矢印の先端側に表示装置を観察する観察位置があるものとし、この観察位置から、第１方向Ｘ及び第２方向Ｙで規定されるＸ－Ｙ平面に向かって見ることを平面視という。第１方向Ｘ及び第３方向Ｚによって規定されるＸ－Ｚ平面、あるいは第２方向Ｙ及び第３方向Ｚによって規定されるＹ－Ｚ平面における表示装置の断面を見ることを断面視という。 Also, it is assumed that there is an observation position for observing the display device on the tip side of the arrow in the third direction Z, and viewing from this observation position toward the XY plane defined by the first direction X and the second direction Y is called planar view. Viewing a cross section of the display device on the XZ plane defined by the first direction X and the third direction Z or the YZ plane defined by the second direction Y and the third direction Z is referred to as a cross-sectional view.
　図１は、本実施形態に係る表示装置を示す分解斜視図である。 FIG. 1 is an exploded perspective view showing the display device according to this embodiment.
　表示装置ＤＳＰは、表示パネルＰＮＬと、照明装置ＩＬＤと、を備えている。本実施形態において、表示パネルＰＮＬは、一般に知られている透過型又は半透過型の液晶表示パネルである。表示パネルＰＮＬは、表示領域ＤＡに、複数の画素ＰＸを有している。 The display device DSP includes a display panel PNL and an illumination device ILD. In this embodiment, the display panel PNL is a generally known transmissive or transflective liquid crystal display panel. The display panel PNL has a plurality of pixels PX in the display area DA.
　ただし、表示パネルＰＮＬは、液晶表示パネルに限定されるものではなく、ＭＥＭＳ（Ｍｉｃｒｏ　Ｅｌｅｃｔｒｏ－Ｍｅｃｈａｎｉｃａｌ　Ｓｙｓｔｅｍ）の表示パネルなど、別途光源を必要とする表示パネルであればよい。 However, the display panel PNL is not limited to a liquid crystal display panel, and may be a display panel that requires a separate light source, such as a MEMS (Micro Electro-Mechanical System) display panel.
　照明装置ＩＬＤは、表示パネルＰＮＬの下方に対向配置されている。照明装置ＩＬＤは、表示パネルＰＮＬに向けて光を放出する。本実施形態において、照明装置ＩＬＤはバックライトユニットとして機能している。表示パネルＰＮＬは、照明装置ＩＬＤからの光を選択的に透過させることで画像を表示する。 The illumination device ILD is arranged below the display panel PNL to face it. The illumination device ILD emits light towards the display panel PNL. In this embodiment, the illumination device ILD functions as a backlight unit. The display panel PNL displays an image by selectively transmitting light from the illumination device ILD.
　図１に示すように、照明装置ＩＬＤは、配線基板ＣＢＳと、複数の発光素子ＬＥＭと、駆動部ＤＶＭと、保護層ＯＣと、拡散シートＤＦＳと、プリズムシートＰＳＭと、を備えている。配線基板ＣＢＳ、複数の発光素子ＬＥＭ、保護層ＯＣ、及びプリズムシートＰＳＭは、第３方向Ｚにこの順に積層されている。 As shown in FIG. 1, the lighting device ILD includes a wiring board CBS, a plurality of light emitting elements LEM, a driving section DVM, a protective layer OC, a diffusion sheet DFS, and a prism sheet PSM. The wiring board CBS, the plurality of light emitting elements LEM, the protective layer OC, and the prism sheet PSM are laminated in the third direction Z in this order.
　本実施形態において、配線基板ＣＢＳは、プリント回路基板（ＰＣＢ：Ｐｒｉｎｔｅｄ　Ｃｉｒｃｕｉｔ　Ｂｏａｒｄ）で構成されている。但し、配線基板ＣＢＳはプリント回路基板に限らず、フレキシブルプリント基板（ＦＰＣ：Ｆｌｅｘｉｂｌｅ　Ｐｒｉｎｔｅｄ　Ｃｉｒｃｕｉｔ）で構成されていてもよい。 In this embodiment, the wiring board CBS is composed of a printed circuit board (PCB). However, the wiring board CBS is not limited to a printed circuit board, and may be composed of a flexible printed circuit (FPC).
　配線基板ＣＢＳは、主面ＭＳＦ上を有している。主面ＭＳＦ上には、光出射領域ＬＡが設けられる。光出射領域ＬＡは、少なくとも表示パネルＰＮＬの表示領域ＤＡと対向している。 The wiring board CBS has a main surface MSF. A light emitting area LA is provided on the main surface MSF. The light emission area LA faces at least the display area DA of the display panel PNL.
　複数の発光素子ＬＥＭは、光出射領域ＬＡ内に設けられる。複数の発光素子ＬＥＭは、第１方向Ｘ及び第２方向Ｙに沿って、マトリクス状に配置されている。本実施形態において、発光素子ＬＥＭは、ミニＬＥＤ（ミニ発光ダイオード）である。主面ＭＳＦ上には、光出射領域ＬＡの外側に、複数の発光素子ＬＥＭを駆動する駆動部ＤＶＭが実装されている。発光素子ＬＥＭは、特定の波長の光を出力する。 A plurality of light emitting elements LEM are provided in the light emitting area LA. The plurality of light emitting elements LEM are arranged in a matrix along the first direction X and the second direction Y. As shown in FIG. In this embodiment, the light emitting element LEM is a mini LED (mini light emitting diode). On the main surface MSF, outside the light emitting area LA, a driving unit DVM for driving the plurality of light emitting elements LEM is mounted. The light emitting element LEM outputs light of a specific wavelength.
　平面視において、発光素子ＬＥＭは、正方形の形状を有している。但し、発光素子ＬＥＭの形状は、長方形など、正方形以外の形状を有してもよい。平面視において、ミニＬＥＤである発光素子ＬＥＭの一辺の長さは、例えば１００μｍを超え３００μｍ未満である。ミニＬＥＤである発光素子ＬＥＭの一辺の長さは、１００μｍを超え２００μｍ以下であってもよい。 In plan view, the light emitting element LEM has a square shape. However, the shape of the light emitting element LEM may have a shape other than square, such as a rectangle. In plan view, the length of one side of the light emitting element LEM, which is a mini LED, is, for example, more than 100 μm and less than 300 μm. The length of one side of the light emitting element LEM which is a mini LED may be more than 100 μm and 200 μm or less.
　なお、発光素子ＬＥＭは、ミニＬＥＤよりサイズの小さいＬＥＤとして、最長の一辺の長さが１００μｍ以下であるマイクロＬＥＤであってもよい。又は、発光素子ＬＥＭは、最長の一辺の長さが１ｍｍ以下のＬＥＤであってもよい。又は、発光素子ＬＥＭは、ミニＬＥＤよりサイズの大きい一般的なＬＥＤとして、最長の一辺の長さが１０００μｍ以上であるＬＥＤであってもよい。なお、上記一般的なＬＥＤである発光素子ＬＥＭの一辺の長さは、例えば、３００μｍ以上３５０μｍ以下である。 It should be noted that the light emitting element LEM may be a micro LED whose longest side is 100 μm or less as an LED smaller than the mini LED. Alternatively, the light emitting element LEM may be an LED whose longest side is 1 mm or less. Alternatively, the light-emitting element LEM may be an LED having a longest side length of 1000 μm or more, which is a general LED that is larger than the mini-LED. The length of one side of the light-emitting element LEM, which is the general LED, is, for example, 300 μm or more and 350 μm or less.
　保護層ＯＣは、発光素子ＬＥＭが放出した光の波長を透過する光透過層として構成されている。保護層ＯＣは、例えばシリコン樹脂で形成されている。保護層ＯＣは、発光素子ＬＥＭを覆って設けられていればよい。 The protective layer OC is configured as a light transmission layer that transmits the wavelength of light emitted by the light emitting element LEM. The protective layer OC is made of silicone resin, for example. The protective layer OC may be provided so as to cover the light emitting element LEM.
　拡散シートＤＦＳは、２枚の拡散シートＤＦＳ１及びＤＦＳ２を有している。ただし、拡散シートの数はこれに限定されない。所定の厚さを有する１枚の拡散シートを設けてもよいし、複数の拡散シートを積層してもよい。 The diffusion sheet DFS has two diffusion sheets DFS1 and DFS2. However, the number of diffusion sheets is not limited to this. A single diffusion sheet having a predetermined thickness may be provided, or a plurality of diffusion sheets may be laminated.
　プリズムシートＰＳＭは、直交配置された２枚の屈折型プリズムシートＰＳＭ１及びＰＳＭ２で構成されている。ただし、プリズムシートＰＳＭは、屈折型プリズムシートＰＳＭ１の代わりに全反射型プリズムシートで構成されていてもよい。全反射型プリズムシートは、構成が簡単で光の利用効率や垂直集光性に優れている。 The prism sheet PSM is composed of two orthogonally arranged refractive prism sheets PSM1 and PSM2. However, the prism sheet PSM may be composed of a total reflection prism sheet instead of the refractive prism sheet PSM1. The total reflection type prism sheet has a simple structure and is excellent in light utilization efficiency and vertical light convergence.
　表示パネルＰＮＬは、基板ＳＵＢ１と、基板ＳＵＢ２と、液晶層ＬＣＹとフレキシブル配線基板ＦＣと、駆動部ＩＰＣと、を備えている。液晶層ＬＣＹは、基板ＳＵＢ１及びＳＵＢ２との間に設けられている。基板ＳＵＢ１及びＳＵＢ２との間には、基板の端部を囲むシール材（非図示）が設けられている。液晶層ＬＣＹは、当該シール材が囲む領域の内側に設けられている。 The display panel PNL includes a substrate SUB1, a substrate SUB2, a liquid crystal layer LCY, a flexible wiring substrate FC, and a driver IPC. The liquid crystal layer LCY is provided between the substrates SUB1 and SUB2. Between the substrates SUB1 and SUB2, a sealing material (not shown) surrounding the edges of the substrates is provided. The liquid crystal layer LCY is provided inside the area surrounded by the sealing material.
　基板ＳＵＢ１は、基板ＳＵＢ２と重畳しない端部Ｅｘを有している。端部Ｅｘには、フレキシブル配線基板ＦＣが設けられている。フレキシブル配線基板ＦＣには、駆動部ＩＰＣが接続されている。駆動部ＩＰＣは、フレキシブル配線基板ＦＣを介して、表示領域ＤＡの画素ＰＸと接続されており、画素ＰＸを駆動する。画素ＰＸの駆動により、表示領域ＤＡに画像が表示される。 The substrate SUB1 has an end Ex that does not overlap with the substrate SUB2. A flexible wiring board FC is provided at the end Ex. A drive unit IPC is connected to the flexible wiring board FC. The drive unit IPC is connected to the pixels PX in the display area DA via the flexible wiring board FC, and drives the pixels PX. An image is displayed in the display area DA by driving the pixels PX.
　図２Ａ及び図２Ｂは、本実施形態のセグメント領域を説明する平面図である。図２Ａに示すように、光出射領域ＬＡは、複数のセグメント領域ＳＡを区分されている。 2A and 2B are plan views explaining the segment regions of this embodiment. As shown in FIG. 2A, the light emitting area LA is divided into a plurality of segment areas SA.
　本実施形態において、複数のセグメント領域ＳＡは、第１方向Ｘと４５°を成す方向及び第２方向Ｙと４５°を成す方向にマトリクス状に並んでいる。ただし、複数のセグメント領域ＳＡは、マトリクス状に並んでいなくともよく、互いに隣り合って位置していればよい。 In this embodiment, the plurality of segment areas SA are arranged in a matrix in a direction forming 45° with the first direction X and in a direction forming 45° with the second direction Y. However, the plurality of segment areas SA need not be arranged in a matrix, and may be positioned adjacent to each other.
　図２Ａに示す例では、複数のセグメント領域ＳＡそれぞれは、１つの発光素子ＬＥＭを有している。換言すると、複数の発光素子ＬＥＭはそれぞれ区分され、複数のセグメント領域ＳＡを構成する。ただし、セグメント領域ＳＡに設けられる発光素子ＬＥＭの数は１つでなくてもよく、複数の発光素子ＬＥＭが設けられていてもよい。本実施形態では、発光素子ＬＥＭは、セグメント領域ＳＡの中央に設けられている。隣り合う発光素子ＬＥＭのピッチは、隣り合うセグメント領域ＳＡ同士のピッチに相当する。 In the example shown in FIG. 2A, each of the plurality of segment areas SA has one light emitting element LEM. In other words, the plurality of light emitting elements LEM are each segmented to form a plurality of segment areas SA. However, the number of light emitting elements LEM provided in the segment area SA may not be one, and a plurality of light emitting elements LEM may be provided. In this embodiment, the light emitting element LEM is provided in the center of the segment area SA. The pitch between adjacent light emitting elements LEM corresponds to the pitch between adjacent segment areas SA.
　互いに異なるセグメント領域ＳＡに設けられた発光素子ＬＥＭは、駆動部ＤＶＭによってそれぞれ同時又は別々にオン及びオフ駆動する。例えば、駆動部ＤＶＭは、ローカルディミングと呼ばれる手法にて駆動可能である。ローカルディミング駆動では、複数の発光素子ＬＥＭを、分割領域単位で独立に駆動制御する。照明する必要のある画像の領域のみ、発光素子ＬＥＭにて照明し、照明する必要がない画像の領域では、発光素子ＬＥＭからの照明光を照射しない。つまり、照明する必要のある画像の領域のみ、複数の発光素子ＬＥＭをオン状態とし、不要の領域では、発光素子ＬＥＭをオフ状態とする。これにより、表示パネルＰＮＬに表示される画像のコントラスト比を一層高めることが可能である。 The light-emitting elements LEM provided in segment areas SA different from each other are simultaneously or separately driven on and off by the driving unit DVM. For example, the driving unit DVM can be driven by a technique called local dimming. In the local dimming drive, the plurality of light emitting elements LEM are independently driven and controlled for each divided area. Only the area of the image that needs to be illuminated is illuminated by the light emitting element LEM, and the area of the image that does not need to be illuminated is not illuminated by the illumination light from the light emitting element LEM. That is, the plurality of light emitting elements LEM are turned on only in areas of the image that need to be illuminated, and the light emitting elements LEM are turned off in areas that do not need to be illuminated. This makes it possible to further increase the contrast ratio of the image displayed on the display panel PNL.
　図２Ｂに示すように、表示領域ＤＡに設けられた複数の画素ＰＸは、複数のセグメント領域ＰＡに区分されている。１つのセグメント領域ＰＡには、複数の画素ＰＸが設けられている。１つのセグメント領域ＰＡには、例えば、１０×１０、すなわち１００個の画素ＰＸが設けられていればよい。ただし、１つのセグメント領域ＰＡに設けられる画素ＰＸの数は、これに限定されない。 As shown in FIG. 2B, a plurality of pixels PX provided in the display area DA are divided into a plurality of segment areas PA. A plurality of pixels PX are provided in one segment area PA. For example, 10×10, that is, 100 pixels PX may be provided in one segment area PA. However, the number of pixels PX provided in one segment area PA is not limited to this.
　セグメント領域ＳＡは、ローカルディミング駆動における最小単位である。１つのセグメント領域ＳＡに配置される一群の発光素子ＬＥＭが、同時に点灯（オン状態）又は消灯（オフ状態）となるように駆動される。 The segment area SA is the minimum unit in local dimming drive. A group of light-emitting elements LEM arranged in one segment area SA are simultaneously driven to be lit (on state) or extinguished (off state).
　１つのセグメント領域ＳＡは、１つのセグメント領域ＰＡに対応している。当該セグメント領域ＰＡに配置される一群の画素ＰＸは、上記一群の発光素子ＬＥＭにより照明される。 One segment area SA corresponds to one segment area PA. A group of pixels PX arranged in the segment area PA is illuminated by the group of light emitting elements LEM.
　表示領域ＤＡに表示される画像に応じて、駆動部ＩＰＣは、セグメント領域ＰＡの画素ＰＸに駆動信号を出力する。駆動部ＤＶＭは、各セグメント領域ＰＡに対応するセグメント領域ＳＡに対して、発光素子ＬＥＭの点灯及び消灯を制御する駆動信号を出力する。 The drive unit IPC outputs drive signals to the pixels PX of the segment area PA according to the image displayed in the display area DA. The drive unit DVM outputs a drive signal for controlling lighting and extinguishing of the light emitting element LEM to the segment area SA corresponding to each segment area PA.
　例えば、当該画像に変化が生じる場合、駆動部ＩＰＣは、当該変化に応じた駆動信号を出力する。駆動部ＤＶＭは、当該画像の変化に応じて、発光素子ＬＥＭの点灯及び消灯を制御する駆動信号を、該当するセグメント領域ＳＡに出力する。 For example, when the image changes, the drive unit IPC outputs a drive signal corresponding to the change. The driving unit DVM outputs a driving signal for controlling lighting and extinguishing of the light emitting element LEM to the corresponding segment area SA according to the change of the image.
　図示しないが、駆動部ＩＰＣ及びＤＶＭに接続され、それぞれに制御信号を出力する駆動素子を設けてもよい。上記駆動部ＩＰＣ及びＤＶＭの駆動信号は、当該駆動素子からの制御信号に基づいて出力される。 Although not shown, drive elements may be provided that are connected to the drive units IPC and DVM and output control signals to each. Drive signals for the drive units IPC and DVM are output based on control signals from the drive elements.
　図３は、本実施形態における、重畳するセグメント領域を説明する図である。本実施形態のセグメント領域ＳＡの形状は、セグメント領域ＰＡの形状と異なっている。図３の詳細については、後述する。 FIG. 3 is a diagram for explaining overlapping segment regions in this embodiment. The shape of the segment area SA of this embodiment is different from the shape of the segment area PA. Details of FIG. 3 will be described later.
　図４Ａ及び図４Ｂは、比較例のセグメント領域を説明する図である。図５は、比較例における、重畳するセグメント領域ＳＡ及びＰＡを説明する図である。 FIGS. 4A and 4B are diagrams for explaining segment regions of comparative examples. FIG. 5 is a diagram illustrating overlapping segment areas SA and PA in a comparative example.
　図４Ａ、図４Ｂ、図５において、発光素子ＬＥＭのセグメント領域ＳＡと、画素ＰＸのセグメント領域ＰＡは、同一形状である。セグメント領域ＳＡ及びＰＡが同一形状の場合、１つのセグメント領域ＳＡの発光素子ＬＥＭの光が、対応するセグメント領域ＰＡだけでなく、当該セグメント領域ＰＡに隣接するセグメント領域ＰＡに漏れてしまうという恐れがある。これにより、当該隣接するセグメント領域ＰＡは、所望の表示ができなくなってしまう。 4A, 4B, and 5, the segment area SA of the light emitting element LEM and the segment area PA of the pixel PX have the same shape. If the segment areas SA and PA have the same shape, the light from the light emitting elements LEM in one segment area SA may leak not only into the corresponding segment area PA but also into the segment areas PA adjacent to the segment area PA. As a result, the desired display cannot be performed in the adjacent segment area PA.
　本実施形態では、セグメント領域ＳＡ及びＰＡの形状が異なるため、隣接するセグメント領域ＰＡへ光漏れが小さい。これにより、表示品質が向上した表示装置を得ることが可能である。 In this embodiment, since the segment areas SA and PA have different shapes, light leakage to the adjacent segment area PA is small. This makes it possible to obtain a display device with improved display quality.
　図２Ａ、図２Ｂ、及び図３に戻り、本実施形態を説明する。セグメント領域ＳＡは、正方形形状を有している。セグメント領域ＳＡの向かい合う２組の辺は、それぞれ、第１方向Ｘ及び第２方向Ｙに対して４５°傾いている。 Returning to FIGS. 2A, 2B, and 3, the present embodiment will be described. Segment area SA has a square shape. Two pairs of opposing sides of the segment area SA are inclined 45° with respect to the first direction X and the second direction Y, respectively.
　セグメント領域ＰＡは、長方形形状を有しており、長辺は第１方向Ｘに沿って延伸しており、短辺は第２方向Ｙに沿って延伸している。すなわち、セグメント領域ＰＡの形状は、紙面左右に長い長方形である。セグメント領域ＰＡの長辺は、セグメント領域ＳＡの対角線と同じ長さを有している。 The segment area PA has a rectangular shape with long sides extending along the first direction X and short sides extending along the second direction Y. That is, the shape of the segment area PA is a rectangle elongated in the left and right of the paper surface. The long side of segment area PA has the same length as the diagonal line of segment area SA.
　図３に示すように、セグメント領域ＰＡは、第１方向Ｘに沿ってセグメント領域ＳＡを覆っている。一方、第２方向Ｙに沿って、セグメント領域ＰＡの一部は、セグメント領域ＳＡと重畳していない。 As shown in FIG. 3, the segment area PA covers the segment area SA along the first direction X. On the other hand, along the second direction Y, part of the segment area PA does not overlap with the segment area SA.
　図３及び図５において、セグメント領域ＳＡの第１方向Ｘ及び第２方向Ｙにおけるピッチを、それぞれ、ＰＳｘ及びＰＳｙとする。セグメント領域ＰＡの第１方向第１方向Ｘ及び第２方向Ｙにおけるピッチを、それぞれ、ＰＰｘ及びＰＰｙとする。 In FIGS. 3 and 5, the pitches of the segment areas SA in the first direction X and the second direction Y are assumed to be PSx and PSy, respectively. Let PPx and PPy be the pitches of the segment areas PA in the first direction X and the second direction Y, respectively.
　本実施形態のピッチＰＰｘは、ＰＰｘ＝√（（ＰＳｘ）２＋（ＰＳｙ）２）で表される。本実施形態のピッチＰＰｙは、ＰＰｙ＝（√（（ＰＳｘ）２＋（ＰＳｙ）２））／２で表される。セグメント領域ＰＡの面積は、（（ＰＳｘ）２＋（ＰＳｙ）２）／２である。 The pitch PPx of this embodiment is represented by PPx=√((PSx) 2 +(PSy) 2 ). The pitch PPy of this embodiment is represented by PPy=(√((PSx) 2 +(PSy) 2 ))/2. The area of segment area PA is ((PSx) 2 +(PSy) 2 )/2.
　一方、比較例のセグメント領域ＰＡの面積は、ＰＰｘ×ＰＰｙである。 On the other hand, the area of the segment area PA of the comparative example is PPx×PPy.
　本実施形態及び比較例において、セグメント領域ＳＡの面積は、ＰＰｘ×ＰＰｙである。 In the present embodiment and comparative example, the area of the segment area SA is PPx×PPy.
　本実施形態のＰＰｘ及びＰＰｙは、セグメント領域ＰＡの面積がセグメント領域ＳＡの面積と同様となるように決定してもよい。すなわち、ピッチＰＰｘ及びＰＰｙは、（（ＰＳｘ）２＋（ＰＳｙ）２）／２＝ＰＰｘ×ＰＰｙを満たすように決定してもよい。 PPx and PPy of the present embodiment may be determined such that the area of the segment area PA is the same as the area of the segment area SA. That is, the pitches PPx and PPy may be determined so as to satisfy ((PSx) 2 +(PSy) 2 )/2=PPx×PPy.
　図６は、比較例及び本実施形態のセグメント領域、並びに、発光素子の輝度プロファイルを示す図である。図６では、分かり易いように、比較例及び本実施形態のセグメント領域の符号を、上記とは変えることとする。セグメント領域ＳＡｂ及びＰＡｂは、比較例のセグメント領域ＳＡ及びＰＡであり、図５と同様である。セグメント領域ＳＡａ及びＰＡａは、本実施形態のセグメント領域ＳＡ及びＰＡであり、図３と同様である。プロファイルＰＦは、発光素子ＬＥＭから出射される光の輝度プロファイルである。 FIG. 6 is a diagram showing the segment regions of the comparative example and the present embodiment, and the luminance profile of the light emitting element. In FIG. 6, for the sake of clarity, the reference numerals of the segment regions of the comparative example and the present embodiment are changed from those described above. Segment areas SAb and PAb are segment areas SA and PA of a comparative example, and are the same as in FIG. Segment areas SAa and PAa are the segment areas SA and PA of this embodiment, and are the same as in FIG. A profile PF is a luminance profile of light emitted from the light emitting element LEM.
　プロファイルＰＦのうち、極大値を含む輝度の高い領域をｐ１とし、領域ｐ１の近傍の領域をｐ２とする。領域ｐ２のさらに外側の領域をｐ３とする。 　In the profile PF, let p1 be the high-brightness region containing the maximum value, and let p2 be the region near the region p1. A region outside the region p2 is p3.
　比較例のセグメント領域ＰＡｂでは、領域ｐ１の光のみを用いて、照明を行っている。領域ｐ２及びｐ３の光が、当該セグメント領域ＰＡｂに隣接するセグメント領域ＰＡｂに出射されてしまう。 In the segment area PAb of the comparative example, illumination is performed using only the light from the area p1. Light from regions p2 and p3 is emitted to segment region PAb adjacent to segment region PAb.
　一方、本実施形態のセグメント領域ＰＡａは、領域ｐ１だけでなく、領域ｐ２の光によっても照明される。領域ｐ３の光は、隣接するセグメント領域ＰＡａに出射されてしまうが、輝度が低いため、表示品質には影響を与えない。このように、本実施形態では、隣接するセグメント領域ＰＡａへの光漏れが小さい表示装置を得ることができる。 On the other hand, the segment area PAa of the present embodiment is illuminated not only by the light of the area p1 but also by the light of the area p2. Although the light of the area p3 is emitted to the adjacent segment area PAa, it does not affect the display quality because the luminance is low. Thus, in this embodiment, it is possible to obtain a display device with little light leakage to the adjacent segment area PAa.
　図７は、本実施形態における、重畳するセグメント領域を説明する図である。図７に示す構成例は、図３に示す構成例と比較して、セグメント領域ＰＡが、紙面上下に長い長方形であるという点で異なっている。 FIG. 7 is a diagram for explaining overlapping segment regions in this embodiment. The configuration example shown in FIG. 7 is different from the configuration example shown in FIG. 3 in that the segment area PA is a rectangle elongated vertically on the page.
　図７に示すセグメント領域ＰＡでは、長辺は第２方向Ｙに沿って延伸しており、短辺は第１方向Ｘに沿って延伸している。図３と同様、セグメント領域ＰＡの長辺は、セグメント領域ＰＡの長辺は、セグメント領域ＳＡの対角線と同じ長さを有している。 In the segment area PA shown in FIG. 7, the long sides extend along the second direction Y, and the short sides extend along the first direction X. As in FIG. 3, the long side of the segment area PA has the same length as the diagonal line of the segment area SA.
　図７に示す構成例においても、光漏れが小さい表示装置を得ることが可能である。これにより、これにより、表示品質が向上した表示装置を得ることができる。 Also in the configuration example shown in FIG. 7, it is possible to obtain a display device with small light leakage. Thereby, a display device with improved display quality can be obtained.
　＜構成例１＞　
　図８Ａ及び図８Ｂは、実施形態における表示装置の他の構成例を示す平面図である。図８Ａ及び図８Ｂに示す構成例では、図３に示した構成例と比較して、セグメント領域ＳＡ及びＰＡがいずれも平面視で平行四辺形であるという点で異なっている。 <Configuration example 1>
8A and 8B are plan views showing other configuration examples of the display device according to the embodiment. The configuration examples shown in FIGS. 8A and 8B are different from the configuration example shown in FIG. 3 in that both the segment areas SA and PA are parallelograms in plan view.
　図８Ａに示すように、本構成例のセグメント領域ＳＡは、平行四辺形形状を有している。第１方向Ｘから時計回りに角度θ１傾いた方向をＤ１、第２方向Ｙから時計回りに角度θ２傾いた方向をＤ２とする。セグメント領域ＳＡの向かい合う２組の辺は、それぞれ、方向Ｄ１及びＤ２に沿って延伸している。セグメント領域ＳＡの辺はすべて同じ長さでもよい。すなわち、セグメント領域ＳＡはひし形形状を有していてもよい。 As shown in FIG. 8A, the segment area SA of this configuration example has a parallelogram shape. A direction tilted clockwise by an angle θ1 from the first direction X is D1, and a direction tilted clockwise by an angle θ2 from the second direction Y is D2. Two pairs of opposing sides of segment area SA extend along directions D1 and D2, respectively. All sides of the segment area SA may have the same length. That is, segment area SA may have a rhombus shape.
　複数の発光素子ＬＥＭは、方向Ｄ１及びＤ２に沿って、マトリクス状に配置されている。 A plurality of light emitting elements LEM are arranged in a matrix along the directions D1 and D2.
　図８Ｂに示すように、セグメント領域ＰＡは、平行四辺形形状を有している。第１方向Ｘから時計回りに角度θ３傾いた方向をＤ３、第２方向Ｙから時計回りに角度θ４傾いた方向をＤ４とする。セグメント領域ＰＡの長辺は方向Ｄ３に沿って延伸しており、短辺は方向Ｄ４に沿って延伸している。 As shown in FIG. 8B, the segment area PA has a parallelogram shape. A direction tilted clockwise by an angle θ3 from the first direction X is D3, and a direction tilted clockwise by an angle θ4 from the second direction Y is D4. The long sides of the segment area PA extend along the direction D3, and the short sides extend along the direction D4.
　図９は、本構成例における、重畳するセグメント領域ＳＡ及びＰＡを説明する図である。セグメント領域ＰＡの長辺は、セグメント領域ＳＡの対角線のうち、少なくとも１つと同じ長さを有している。 FIG. 9 is a diagram illustrating overlapping segment areas SA and PA in this configuration example. The long side of segment area PA has the same length as at least one of the diagonal lines of segment area SA.
　本構成例によっても、実施の形態と同様の効果を奏する。 This configuration example also has the same effect as the embodiment.
　本開示では、セグメント領域ＳＡ及びＰＡを、それぞれ、第１セグメント領域及び第２セグメント領域という。駆動部ＤＶＭ及びＩＰＣを、それぞれ、第１駆動部及び第２駆動部ともいう。 In the present disclosure, segment areas SA and PA are referred to as first segment area and second segment area, respectively. The drivers DVM and IPC are also referred to as the first driver and the second driver, respectively.
　本発明のいくつかの実施形態を説明したが、これらの実施形態は、例として提示したものであり、発明の範囲を限定することは意図していない。これら新規な実施形態は、その他の様々な形態で実施されることが可能であり、発明の要旨を逸脱しない範囲で、種々の省略、置き換え、変更を行うことができる。これら実施形態やその変形は、発明の範囲や要旨に含まれるとともに、特許請求の範囲に記載された発明とその均等の範囲に含まれる。 Although several embodiments of the invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and equivalents thereof.
　ＤＳＰ…表示装置、ＤＶＭ…駆動部、ＩＬＤ…照明装置、ＩＰＣ…駆動部、ＬＥＭ…発光素子、ＰＡ…セグメント領域、ＰＮＬ…表示パネル、ＰＰｘ…ピッチ、ＰＰｙ…ピッチ、ＰＸ…画素、ＳＡ…セグメント領域。 DSP...display device, DVM...drive section, ILD...illumination device, IPC...drive section, LEM...light emitting element, PA...segment area, PNL...display panel, PPx...pitch, PPy...pitch, PX...pixel, SA...segment area.

Claims (7)

  1. 　複数の発光素子と、前記複数の発光素子を駆動する第１駆動部と、を備える照明装置と、
    　複数の画素と、前記複数の画素を駆動する第２駆動部と、を備える表示パネルと、
    　を備え、
    　前記複数の発光素子は、複数の第１セグメント領域に区分され、
    　前記複数の画素は、複数の第２セグメント領域に区分され、
    　前記複数の発光素子は前記第１セグメント領域単位で独立して駆動され、
    　前記第１駆動部は、前記第２セグメント領域に対応する前記第１セグメント領域に対して、前記発光素子の点灯及び消灯を制御する駆動信号を出力し、
    　前記第１セグメント領域及び前記第２セグメント領域の形状は異なる、表示装置。     a lighting device comprising: a plurality of light emitting elements; and a first driving section for driving the plurality of light emitting elements;
    a display panel comprising a plurality of pixels and a second driving section that drives the plurality of pixels;
    with
    The plurality of light emitting elements are divided into a plurality of first segment regions,
    The plurality of pixels are divided into a plurality of second segment regions,
    The plurality of light emitting elements are independently driven in units of the first segment regions,
    The first drive unit outputs a drive signal for controlling lighting and extinguishing of the light emitting element to the first segment region corresponding to the second segment region,
    The display device, wherein the first segment area and the second segment area have different shapes.
  2. 　前記第１セグメント領域は、正方形形状を有しており、
    　前記第２セグメント領域は、長方形形状を有している、請求項１に記載の表示装置。     The first segment region has a square shape,
    2. The display device of Claim 1, wherein the second segment area has a rectangular shape.
  3. 　前記第１セグメント領域及び前記第２セグメント領域は、それぞれ、平行四辺形形状を有している、請求項１に記載の表示装置。 The display device according to claim 1, wherein the first segment area and the second segment area each have a parallelogram shape.
  4. 　前記第１セグメント領域は、ひし形形状を有している、請求項１に記載の表示装置。 The display device according to claim 1, wherein the first segment area has a rhombus shape.
  5. 　前記第２セグメント領域の長辺は、前記第１セグメント領域の対角線の１つと同じ長さである、請求項２から４までのいずれか１項に記載の表示装置。 The display device according to any one of claims 2 to 4, wherein the long side of the second segment area has the same length as one of the diagonal lines of the first segment area.
  6. 　前記複数の発光素子それぞれは、前記複数の第１セグメント領域それぞれに設けられる、請求項１に記載の表示装置。 The display device according to claim 1, wherein each of the plurality of light emitting elements is provided in each of the plurality of first segment regions.
  7. 　前記表示パネルは、液晶表示パネルである、請求項１に記載の表示装置。 The display device according to claim 1, wherein the display panel is a liquid crystal display panel.
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