WO2013115043A1 - Dispositif d'affichage - Google Patents

Dispositif d'affichage Download PDF

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Publication number
WO2013115043A1
WO2013115043A1 PCT/JP2013/051374 JP2013051374W WO2013115043A1 WO 2013115043 A1 WO2013115043 A1 WO 2013115043A1 JP 2013051374 W JP2013051374 W JP 2013051374W WO 2013115043 A1 WO2013115043 A1 WO 2013115043A1
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Prior art keywords
display
display device
light
light amount
substrates
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PCT/JP2013/051374
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English (en)
Japanese (ja)
Inventor
誠 江口
直人 脇
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シャープ株式会社
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Publication of WO2013115043A1 publication Critical patent/WO2013115043A1/fr

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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/50—OLEDs integrated with light modulating elements, e.g. with electrochromic elements, photochromic elements or liquid crystal elements
    • 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
    • G02F1/133616—Front illuminating devices
    • 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
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/44—Arrangements combining different electro-active layers, e.g. electrochromic, liquid crystal or electroluminescent layers
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2203/00—Function characteristic
    • G02F2203/48—Variable attenuator

Definitions

  • the present invention relates to a display device. More specifically, the present invention relates to a self-luminous display device that uses external light as display light.
  • Examples of the display device include a display device using a self-luminous display element such as an organic EL display element, a display device using a non-self-luminous display element such as a liquid crystal display element, and the like. That is, like a display device using a non-self-luminous display element, a display device using a self-luminous display element such as an organic EL display element is also indispensable as a means for displaying information and images. For example, in recent years, it has been widely used for mobile information terminal devices such as mobile phones such as smartphones and tablets. For example, a display device using a typical organic EL display element as a self-luminous display element has excellent contrast ratio and viewing angle characteristics, and can perform display without using a separate lighting device (backlight). There are merits such as reduction in thickness.
  • a display device using such a self-luminous display element is often used both indoors and outdoors, such as a portable information terminal device, etc., and improves visibility under outside light and makes it easy to see the display outside. There was room for ingenuity to do.
  • a display element including a circularly polarizing plate, a selective reflection type filter, and a self-luminous element in this order, between the circularly polarizing plate and the selective reflection type filter, or the selective reflection type filter and the self-luminous element.
  • a display element in which an absorption color filter is provided between the light emitting element and the light emitting element is disclosed (for example, see Patent Document 1).
  • a first display unit that performs light emission display by controlling the light emission amount for each pixel, and a transmission state that transmits external light and a reflection state that reflects at least part of the light can be set for each pixel.
  • a second display unit that performs display in a combination of a region and a reflective region, and the first display unit is provided on the first display unit so that the first display unit can be visually recognized through the transmission region of the second display unit.
  • a display device in which a second display portion is stacked is disclosed (for example, see Patent Document 2).
  • a pair of light-transmitting substrates disposed opposite to each other, a polarizing plate disposed on a non-facing surface of the pair of light-transmitting substrates, and a liquid crystal disposed between the pair of light-transmitting substrates.
  • a first display means having a layer, and a first display means that is disposed on the opposite side of the first display means from the viewing side, and is disposed so as to face the transparent substrate.
  • Second display means having a light reflecting member and an organic EL layer disposed between the light reflecting member and the transparent substrate, illuminance detecting means for detecting illuminance, and detected by the illuminance detecting means
  • a display device includes display control means for controlling the display to be performed by the second display means when the illuminance is smaller than a predetermined value (see, for example, Patent Document 3).
  • the display area includes a first display area including a non-light emitting display element in which light modulation element reflects external light to perform display, and a light emitting display element in which a light emitting element including a reflective electrode directly modulates and displays.
  • the light emitting element and the light modulation layer of the light modulation element are sequentially stacked on the first substrate in the second display area, and the first display area or the second display area in the same pixel is provided in the second display area.
  • a display device is disclosed in which one of the two display areas is in a display state and the other is always in a black state regardless of the presence or absence of external light (see, for example, Patent Document 4).
  • FIG. 11 is a schematic cross-sectional view conceptually showing a conventional self-luminous display device outdoors in fine weather.
  • the display device 310 is configured by providing a light emitter 314 on a lower substrate (TFT [Thin Film Transistor: Thin Film Transistor] substrate) 312.
  • TFT Thin Film Transistor: Thin Film Transistor
  • Conventional self-luminous display devices (displays) represented by organic EL have poor visibility under outdoor light outdoors.
  • the amount of external light 342 reflected from the surface of the display device 310 is larger than the amount of display light 344b emitted from the light emitter, so that the display light 344b is canceled out. Because.
  • the present invention has been made in view of the above-described situation, and by suitably realizing reflective display in a self-luminous display device, wide viewing angle characteristics due to self-luminance and outdoor visibility due to reflective display are achieved.
  • An object of the present invention is to provide a compatible display device. That is, an object of the present invention is to realize a reflective display even with a self-luminous display.
  • a display light attention was focused on reflective display that can improve visibility.
  • a non-self-luminous display typified by liquid crystal
  • a reflective display that uses external light as display light.
  • a transmitted light amount / reflected light amount adjustment device It is possible to adjust the ratio between the amount of light that is reflected by the reflector and the amount of light that is transmitted from the light emitter to the observation surface side of the display device.
  • the present inventor combined a device capable of adjusting the amount of reflection of external light (for example, a MEMS shutter) with the white + color filter method, which is one of the self-luminous structures, and used external light as display light. It has been found that this is particularly suitable, and the present invention has been conceived.
  • FIG. 12 is a diagram conceptually showing the function and effect of the display device described in Patent Document 1.
  • the function and effect of the display device described in Patent Document 1 eliminates the surface reflection of external light 442. (Reference number 446 indicates that the reflected light has disappeared.).
  • the present invention makes effective use of external light by realizing a reflective type with a self-luminous display.
  • the second display unit (reflection / transmission dual-use display) that performs display using a combination of a transmission region and a reflection region is not capable of color display.
  • the invention described in Patent Document 2 realizes a reflection / transmission display with cholesteric liquid crystal, but since cholesteric liquid crystal selectively reflects only light of an arbitrary wavelength, colorization is not possible in principle. Is possible.
  • the problem to be solved by the invention described in Patent Document 2 is “Providing a display device capable of minimizing power consumption while allowing satisfactory image display”. By making the display color, it becomes impossible to minimize the power consumption, and it is considered that there is a contradiction as a countermeasure for the problem.
  • the display device of the present invention can perform the same color display during reflection and during transmission, and is different from the display device described in Patent Document 2 in this respect. Note that the display device described in Patent Document 2 switches the display unit according to the remaining amount of the power battery, not the illuminance of external light.
  • the first display means disposed on the viewing side of the second display means having the light reflecting member and the organic EL layer is a total transmission liquid crystal display.
  • the present invention can adjust the ratio between the amount of light that is reflected by the reflector and the amount of light that is transmitted from the light emitter to the viewing surface of the display device, such as a so-called “semi-transmissive liquid crystal display”.
  • a device for adjusting the transmitted light amount / reflected light amount can be provided, and the optical characteristics in the reflection mode can be secured.
  • the organic EL display element since the organic EL display element has an aluminum back electrode (light reflecting member) and external light passes through the organic EL layer when reflected, an optical loss occurs.
  • the display device described in Patent Document 4 when one of the first display area and the second display area in the same pixel is in the display state, the other is always in the black state regardless of the presence or absence of external light. Is.
  • the display device of the present invention can simultaneously perform display by the reflection (RGB) portion of the liquid crystal display and display by the self-luminous display as in Embodiment 1 described later.
  • the present invention is a display device including a transmitted light amount / reflected light amount adjustment device and a light emitter, and the display device includes the transmitted light amount / reflected light amount adjustment device and the light emitter from the observation surface side.
  • the display surface is viewed in plan, at least a part of the reflector is used for reflective display.
  • the transmitted light amount / reflected light amount adjusting device observes the display device from the light emitter in the transmissive region.
  • This is a display device that adjusts the amount of light emitted to the surface side and the amount of light reflected by the reflector in the reflection area.
  • the display device of the present invention displays each color by a color filter that transmits external light during reflection or in a reflection region. Further, when transmitting or in the transmitting region, each color is displayed by light emission of the light emitter (light emitting material) itself enclosed between the substrates. Light that displays each color in this way is also referred to as display light in this specification.
  • a method not using a color filter and a method using a color filter can be mentioned.
  • An example of a method that does not use a color filter is a mirasol display.
  • a method using a color filter that is, a display device having at least a part of a color filter and a reflector used for reflective display when the display surface is viewed in plan is one of the preferred embodiments of the present invention. It is. Note that the display device has, at least in part, a color filter and a reflector used for reflective display when the display surface is viewed in plan. It is not necessary for the body to be visually recognized, and it is sufficient if the color filter and the reflector are arranged so as to overlap the reflection region when the display surface is viewed in plan.
  • the transmitted light amount / reflected light amount adjustment device does not have to have a reflector used for reflective display, and the amount of light emitted from the light emitter in the transmissive region to the observation surface side of the display device and the external light in the reflective region May adjust the amount of light reflected by the reflector. For example, it is preferable to be able to select the light-emitting mode in which the former light amount is larger or the shutter mode in which the latter light amount is larger.
  • the transmitted light amount / reflected light amount adjusting device is a MEMS shutter.
  • the MEMS shutter refers to a shutter formed using a micro electro mechanical system.
  • the observation surface side is preferably a resin surface and the back surface side is preferably a metal surface.
  • the display device preferably includes a pair of substrates, and a transmitted light amount / reflected light amount adjustment device, a light emitter, and a reflector used for reflective display are disposed between the pair of substrates. Since the display device of the present invention displays each color with a color filter that allows external light to pass through at least partly when the display surface is viewed in plan as described above, the color filter is usually an observation surface side substrate. Provided on the side.
  • the observation surface side substrate of the pair of substrates has a color filter, and the color filter is commonly used for transmissive display and reflective display. . According to the preferable form, the color filter can be effectively used at the time of reflection.
  • colorization at the time of transmissive display can be suitably realized.
  • the fact that the color filter can be shared by the self-light emission and the reflection is one of the major features of the present invention that is not found in the prior art.
  • the reflector used for the reflective display is preferably an electrode for causing the luminous body to emit light.
  • the display device preferably includes at least one switching element for each of a plurality of pixels surrounded by the plurality of gate lines and the plurality of source lines, and the switching element is preferably a TFT.
  • a source signal for example, an image signal
  • the display area can be controlled by active matrix driving.
  • a wiring substrate included in a display device in which a matrix region is controlled using an active element such as a TFT is also referred to as an active matrix substrate. That is, the back side substrate of the pair of substrates is preferably an active matrix substrate.
  • the display device has a transmissive region and a reflective region when the display surface is viewed in plan, and the transmitted light amount / reflected light amount adjustment device includes a pair of substrates and a liquid crystal sandwiched between the pair of substrates. It is also a liquid crystal display, wherein the observation surface side substrate of the pair of substrates has a color filter only in the reflection region, and the back side substrate of the pair of substrates has the reflector only in the reflection region.
  • the transmissive region and the reflective region of the liquid crystal display correspond to the transmissive region and the reflective region in the display device of the present invention, respectively. In other words, when the display surface is viewed in plan, it overlaps with the transmissive region and the reflective region in the display device of the present invention.
  • the back side substrate of the pair of substrates in the liquid crystal display is an active matrix substrate.
  • the said light-emitting body is a self-light-emitting display provided in the back side of the said liquid crystal display.
  • the display device further includes an illuminance sensor.
  • the illuminance sensor measures the illuminance of outside light, and an optimal mode (for example, a self-light-emitting mode or a shutter mode) can be selected according to the illuminance.
  • the configuration of the display device of the present invention is not particularly limited by other components as long as the above-described components are essential, and other configurations (for example, electric resistance) that are usually used in display devices. Layer, etc.) can be applied as appropriate.
  • the display device of the present invention by suitably realizing reflective display in the self-luminous display device, it is possible to achieve both wide viewing angle characteristics due to self-luminance and outdoor visibility due to reflective display.
  • FIG. 3 is a schematic cross-sectional view showing the display device of Embodiment 1.
  • FIG. 3 is a schematic plan view illustrating a picture element of the display device according to the first embodiment.
  • 3 is a schematic cross-sectional view showing the display device of Embodiment 1.
  • FIG. 6 is a schematic cross-sectional view showing a display device of Embodiment 2.
  • FIG. 6 is an explanatory diagram showing a light amount adjustment method for a MEMS shutter according to a second embodiment.
  • 10 is a schematic cross-sectional view showing a display device in a self-luminous mode (all MEMS shutters are on) according to Embodiment 2.
  • FIG. 6 is a schematic cross-sectional view illustrating a display device in a shutter mode (illuminator is off) of Embodiment 2.
  • FIG. 6 is a schematic perspective view illustrating a display device according to Embodiment 3.
  • FIG. It is a graph which shows the visibility with respect to the illumination intensity of each external light of the self-light-emitting mode and shutter mode in the display apparatus of Embodiment 3.
  • It is a cross-sectional schematic diagram which shows notionally the conventional self-luminous type display apparatus in the outdoors at the time of fine weather. It is a figure which shows notionally the effect of the display apparatus of patent document 1.
  • the pixel may be a picture element (sub-pixel) unless otherwise specified.
  • R represents a red pixel
  • G represents a green pixel
  • B represents a blue pixel.
  • the RGB layer refers to a color filter layer (colored layer).
  • FIG. 1 is a schematic cross-sectional view conceptually showing a display device of the present invention outdoors in fine weather.
  • a reflective plate (reflector) 16 is further provided in the self-luminous display device (including at least the lower substrate (for example, TFT substrate 12) and the light emitter 14) shown in FIG. It is possible to improve visibility in an environment where the illuminance of outside light such as outdoors is large. A specific configuration will be described in detail below.
  • FIG. 2 is a schematic cross-sectional view illustrating the display device according to the first embodiment.
  • FIG. 3 is a schematic plan view illustrating a picture element of the display device according to the first embodiment.
  • a liquid crystal display liquid crystal panel
  • the structure of the liquid crystal display is the same as that of a general reflective color display liquid crystal display in the reflection region.
  • the liquid crystal mode is normally white (light is transmitted when no voltage is applied).
  • the pixel is composed of a transmissive region and a reflective region.
  • “reflection R”, “reflection G”, and “reflection B” indicate a red pixel in the reflection region, a green pixel in the reflection region, and a blue pixel in the reflection region, respectively.
  • “Transmission” indicates a transmission region.
  • the pixel structure of the reflection region is the same as a general pixel structure.
  • the transmissive region no structure is placed on either the TFT substrate or the CF substrate (the pixel electrode is not disposed in the first embodiment). That is, in the transmissive region, between the self-luminous display 50 and the surface on the viewing side of the display device is a region of only the raw glass of the TFT substrate 10 / a region of only the raw glass of the color filter (CF) substrate 22. , Liquid crystal 30 / polarizing plate 24. Note that the polarizing plate 24 is not essential in the transmissive region, and a polarizing plate in which the transmissive region is cut out can be used. In that case, the polarizing plate does not exist in the transmissive region.
  • the display color of the self-luminous display 50 and the display color of the reflective electrode are set to be the same.
  • FIG. 4 is a schematic cross-sectional view illustrating the display device according to the first embodiment.
  • the display light (light emitted from the self-luminous display) 44b passes through the liquid crystal display without any obstruction, so that the display color of the self-luminous display is displayed as it is.
  • the reflective region external light is reflected by the reflective electrode, and an arbitrary display color can be displayed by passing through the CF colored layer 26.
  • the reflective (RGB) region of the liquid crystal display is set to the same display (on or off for each pixel [sub-pixel unit]) so as to correspond to the self-luminous display. This contributes to display.
  • the self-luminous display in a bright place, is turned off and display is performed in the reflective (RGB) region of the liquid crystal display, and in a dark place, the reflective (RGB) region of the liquid crystal display is turned off. Displaying on a self-luminous display can be mentioned. It is also possible to simultaneously perform reflection display by the reflection (RGB) region of the liquid crystal display and display of the self-luminous display.
  • the transmission (W) region of the liquid crystal display is made of raw glass. As shown in FIG.
  • the self-luminous display is preferably an organic EL display, but instead of the organic EL display, another self-luminous display that can emit display light (for example, a liquid crystal display device equipped with a backlight) is appropriately used. Can be used. In addition, a shutter such as a MEMS shutter can be used instead of the liquid crystal display.
  • FIG. 5 is a schematic cross-sectional view illustrating the display device according to the second embodiment.
  • the display device according to the second embodiment includes a rear substrate 110 and an observation surface substrate (color filter substrate) 120.
  • the back substrate 110 is provided with a white light emitter 114 w and a MEMS shutter 118 on the TFT substrate 112. Further, a TFT circuit for moving them in sub-pixel units is mounted on the TFT substrate 112.
  • the white light emitter 114w controls the light emission amount in sub-pixel units. Further, the white light emitter 114w is transparent when light is not emitted.
  • a reflector 116 is located under the white light emitter 114w.
  • the reflector 116 may also be used as an electrode mounted on the TFT substrate 112 in order to cause the white light emitter 114w to emit light.
  • the reflector 116 is preferably a reflective electrode.
  • a reflector used for reflective display may be used instead of the reflective electrode.
  • the MEMS shutter 118 which is a transmitted light amount / reflected light amount adjustment device according to the second embodiment, physically controls the amount of light transmitted through the region in units of subpixels.
  • the surface of the MEMS shutter 118 on the CF side normally absorbs light.
  • the TFT side (back side) surface reflects light.
  • the CF side surface of the MEMS shutter normally absorbs light because it is necessary to perform light color adjustment with the MEMS shutter when displaying using external light.
  • the surface of the MEMS shutter on the CF side This is because the light cannot be adjusted if it is reflected.
  • it is desirable that the surface on the TFT side reflects light because light is not wasted by absorption.
  • the MEMS shutter 118 can be manufactured by laminating a plurality of films, as in a general TFT manufacturing process. At this time, it is preferable to laminate a reflective metal such as aluminum on the surface on the TFT side and an absorbing material such as resin BM on the surface on the CF side, thereby realizing desired characteristics.
  • the CF of the observation surface side substrate (CF substrate) 120 is composed of RGB colored layers as in the case of general CF. CF is commonly used for transmissive display and reflective display. In addition, it is preferable that CF is provided over substantially the entire light-transmitting region when all the MEMS shutters are opened when the display surface is viewed in plan.
  • the display device (display) of the second embodiment can switch between two modes: a display mode using the white light emitter 114w (shutter fully on) and a reflection mode using the MEMS shutter (white light emitter off). Note that in this specification, “on” means a state where light can be transmitted, “off” means a state where light is blocked (non-transmissive), and “shutter is on” means that the shutter is in an open state. .
  • FIG. 6 is an explanatory diagram illustrating a light amount adjustment method of the MEMS shutter according to the second embodiment.
  • the light quantity adjustment in the second embodiment includes two methods of space division and time division.
  • the space division the light amount is adjusted by setting the opening amount of the MEMS shutter 118a to a desired size.
  • the time division is realized by adjusting the average light quantity per unit time by switching the MEMS shutter 118b of only two types, on / off, at high speed.
  • the ratio (transmitted light amount) of external light that first passes through the shutter varies depending on how the shutter is opened.
  • Various light emitters in the technical field of the present invention can be used as the light emitter in the second embodiment.
  • phosphors such as iridium complexes are used to form red, blue, and green light emitters.
  • white light emission can be suitably realized.
  • FIG. 7 is a schematic cross-sectional view illustrating the display device in the self-luminous mode (all MEMS shutters are on) according to the second embodiment.
  • FIG. 8 is a schematic cross-sectional view illustrating the display device in the shutter mode (illuminator is off) of the second embodiment.
  • the self-light-emitting mode all the MEMS shutters are in an open state, and can be displayed as a normal self-light-emitting display.
  • the shutter mode since the light emitter is turned off and becomes transparent, reflection display is realized by adjusting the light color of the light reflected by the reflective electrode with the shutter.
  • the effect of the second embodiment is the same as that of the first embodiment, but the performance is very high compared to the first embodiment in which both modes coexist.
  • One of the features of the second embodiment is to use a self-luminous display device (display) including a color filter, which is realized by effectively utilizing the color filter during reflection.
  • the following (1) to (4) can be cited as merits over the first embodiment (method using a liquid crystal display).
  • Two pairs of substrates of “self-luminous display” and “liquid crystal display” are not required, and a MEMS shutter can be formed in the self-luminous display (in Embodiment 1, the self-luminous display) It is impossible in principle to put liquid crystal in the inside or it is difficult to realize in terms of reliability.)
  • a polarizing plate that is indispensable in principle is not necessary for a MEMS shutter, so that it consumes less power.
  • the MEMS shutter has better viewing angle characteristics than liquid crystal and has good compatibility with a self-luminous display having a wide viewing angle characteristic.
  • the MEMS shutter has a higher response speed than liquid crystal (in particular, it has an overwhelming advantage at low temperatures).
  • (5) the opening of the organic EL display is wide, so the life is long. There is a merit.
  • the display device (Embodiment 2) combined with the MEMS shutter is one of particularly preferable forms.
  • the MEMS shutter 118 is placed on the TFT substrate 112 (the back side substrate 110 includes the MEMS shutter 118), and this is placed on the CF substrate side (the observation surface side substrate 120 has the MEMS shutter 118). There is also a method. However, when the MEMS shutter 118 is placed on the CF substrate side, the MEMS shutter 118 is formed below the RGB layer of the CF (TFT side or back side).
  • a MEMS shutter is used as the transmitted light amount / reflected light amount adjustment device, and such a form is preferable.
  • a shutter that can adjust the transmitted light amount / reflected light amount in units of subpixels is used instead of the MEMS shutter. It can be used as appropriate.
  • FIG. 9 is a schematic perspective view illustrating the display device according to the third embodiment.
  • the illuminance sensor 260 is externally attached to the outside of the display device (display) 200 or built in the display device 200.
  • the position of the illuminance sensor 260 is not particularly limited and may be any location, but is preferably provided outside the display area (for example, the peripheral area).
  • Other structures of the display device 200 are the same as the structure of the display device of the second embodiment.
  • the illuminance sensor 260 senses the illuminance of external light and switches to the self-light-emitting mode or the shutter mode accordingly.
  • FIG. 10 is a graph showing the visibility with respect to the illuminance of external light in each of the self-light-emitting mode and the shutter mode in the display device of the third embodiment.
  • the shutter mode has high visibility under external light
  • the self-luminous mode has high visibility in a dark place. Therefore, the illuminance sensor 260 measures the illuminance of external light and can set the optimum mode according to the illuminance. The effect is that the mode is automatically switched to the optimum mode according to the external light. Other effects are the same as those of the second embodiment.
  • the display device of Embodiment 3 can ensure high visibility without depending on ambient illuminance by automatically switching between a self-luminous mode having high visibility in a dark place and a reflection mode having high visibility in a bright place.
  • a self-luminous mode having high visibility in a dark place
  • a reflection mode having high visibility in a bright place.
  • the material of the reflective electrode in the display devices of Embodiments 1 to 3 include metals such as tantalum (Ta), aluminum (Al), tungsten (W), copper (Cu), and nitrides of these metals. Etc.
  • the TFT substrate of Embodiments 1 to 3 is an active matrix substrate, and the application of voltage is controlled for each pixel by the switching function of the TFT, so that precise active matrix driving can be performed.
  • the display device has a color filter at least in the reflective region
  • a system that does not use a color filter can also be employed as a color display during reflective display (for example, , Mirasol display, etc.).
  • Such a method is also included in the present invention.
  • the same constituent members as those in the first to third embodiments can be appropriately applied to the constituent members other than those described above as long as the effects of the present invention are exhibited.
  • TFT substrate back side substrate 12
  • 116 Reflector (reflective electrode) 20
  • Observation surface side substrate 22 Color filter substrate 24: Polarizing plate 26: Color filter (CF colored layer)
  • Color filter (CF colored layer) 30 Liquid crystal 42, 342, 442: External light 44a: Display light (reflected light) 44b, 144b, 344b: Display light (light emitted from the light emitter) 50: Self-luminous display 110: Back substrate 114c: White light emitter 114w in shutter mode (off): White light emitter 118: MEMS shutter 118a: MEMS shutter 118b in space division: MEMS shutter 118c in time division: MEMS shutter 118o in shutter mode: MEMS shutter in open state 200: Display device 260: Illuminance sensor 310: Display device

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  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

L'invention fournit un dispositif d'affichage dans lequel un affichage réfléchissant est développé de manière adéquate au niveau d'un dispositif d'affichage de type auto-luminescent, et qui concilie ainsi des caractéristiques de grand angle de vision du fait de son auto-luminescence, et une visibilité en extérieur du fait de son affichage réfléchissant. Plus précisément, ce dispositif d'affichage est équipé d'un dispositif d'ajustement de quantité de lumière transmise / quantité de lumière réfléchie (118), et d'un corps luminescent (114w). Ledit dispositif d'affichage présente le dispositif d'ajustement de quantité de lumière transmise / quantité de lumière réfléchie et le corps luminescent disposés dans cet ordre depuis un côté face d'observation, et possède, sur au moins une partie selon une vue en plan d'une face d'affichage, un corps réfléchissant (116) mis en œuvre dans l'affichage réfléchissant. Le dispositif d'ajustement de quantité de lumière transmise / quantité de lumière réfléchie ajuste la quantité de lumière émise en sortie depuis le corps luminescent dans une région de transmission vers le côté face d'observation du dispositif d'affichage, et la quantité de lumière extérieure réfléchie par le corps réfléchissant dans une région de réflexion.
PCT/JP2013/051374 2012-01-31 2013-01-24 Dispositif d'affichage WO2013115043A1 (fr)

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EP2963505A1 (fr) * 2014-07-04 2016-01-06 The Swatch Group Research and Development Ltd. Ensemble d'affichage comprenant deux dispositifs d'affichage superposés
EP2963506A1 (fr) * 2014-07-04 2016-01-06 The Swatch Group Research and Development Ltd. Ensemble d'affichage comprenant deux dispositifs d'affichage superposés
WO2017221815A1 (fr) * 2016-06-23 2017-12-28 シャープ株式会社 Substrat de matrice active, substrat d'obturateur optique, dispositif d'affichage et procédé de fabrication d'un substrat de matrice active
WO2018020331A1 (fr) * 2016-07-29 2018-02-01 Semiconductor Energy Laboratory Co., Ltd. Dispositif d'affichage, dispositif d'entrée/de sortie et dispositif à semi-conducteur

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US10942392B2 (en) 2016-07-29 2021-03-09 Semiconductor Energy Laboratory Co., Ltd. Display device, input/output device, and semiconductor device

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