Display device and electronic apparatus equipped with display device

Abstract

A display device 1 according to the present disclosure comprises: a display 10 that has a main surface 10a on which an image is displayed; and a transmittance control layer 20 that is disposed on the main surface 10a side of the display 10 and that controls the amount of ambient light incident on the display 10 by changing the transmittance within a prescribed range.

Description

Display device and electronic device equipped with a display device. 【0001】 This disclosure relates to a display device and an electronic device equipped with a display device. 【0002】 To improve the visibility of display devices such as liquid crystal displays, controlling the amount of light incident on the display device is being considered. 【0003】 For example, Patent Document 1 discloses a transparent glass equipped with a transparent display having a dimming sheet covering the back of the transparent display. In the transparent glass of Patent Document 1, the brightness of the dimming sheet is controlled by the magnitude of the voltage applied to the dimming sheet while an image is displayed on the transparent display. 【0004】 International Publication No. 2020 / 121779 【0005】 The transparent glass described in Patent Document 1 still has room for improvement in terms of improving visibility both outdoors and indoors in display devices. 【0006】 This disclosure provides a display device that improves visibility both outdoors and indoors, and an electronic device equipped with the display device. 【0007】 A display device according to one aspect of the present disclosure comprises a display having a main surface for displaying an image, and a transmittance control layer disposed on the main surface side of the display, which controls the amount of light incident on the display by changing its transmittance within a predetermined range. 【0008】 An electronic device according to one aspect of this disclosure includes the display device described above. 【0009】 According to this disclosure, it is possible to provide a display device with improved visibility, and an electronic device equipped with such a display device. 【0010】Schematic diagram showing an electronic device equipped with a display device according to Embodiment 1 of the present disclosure Partial cross-sectional diagram of the display device according to Embodiment 1 of the present disclosure Partial cross-sectional diagram showing a state in which the transmittance of the transient control layer 20 of the display device in Figure 2 is changed Partial cross-sectional diagram schematically showing a display device according to Modification 1 of Embodiment 1 Partial cross-sectional diagram schematically showing a display device according to Modification 2 of Embodiment 1 Partial cross-sectional diagram schematically showing a display device according to Modification 3 of Embodiment 1 Block diagram schematically showing the configuration of the display device according to Embodiment 2 Block diagram schematically showing the configuration of the display device according to Modification 1 of Embodiment 2 【0011】 (Background to this disclosure) Electronic devices such as laptop PCs or tablets equipped with display devices such as liquid crystal displays or organic EL displays are portable and are therefore sometimes used outdoors. Outdoors, the intensity of ambient light such as sunlight is high, and there is a problem that the visibility of the display device is reduced due to the reflection of ambient light. 【0012】 To address the aforementioned issues, for example, Patent Document 1 discloses a transparent glass that suppresses the reduction in image contrast by adjusting the amount of incident light from behind the transparent display. However, with the transparent glass of Patent Document 1, it is difficult to control the amount of incident light from the front of the liquid crystal display, and it is considered difficult to ensure sufficient visibility outdoors. 【0013】 Furthermore, to improve outdoor visibility, for example, applying an anti-reflective coating to the display surface is being considered. However, in this case, the coating on the display surface may conversely reduce visibility indoors. 【0014】 The inventors of this invention have investigated a display device that improves visibility both outdoors and indoors, and have arrived at the following invention. 【0015】 The embodiments of this disclosure will be described below with reference to the attached drawings. In addition, in each drawing, the elements are exaggerated to facilitate the explanation. 【0016】In this specification, terms such as “First,” “Second,” etc., are used for illustrative purposes only and should not be understood as expressing or implying relative importance or ranking of technical features. Features designated as “First” and “Second” express or imply that they include one or more such features. 【0017】 (Embodiment 1) [Overall Configuration] Figure 1 is a schematic diagram showing an electronic device 100 equipped with a display device 1 according to Embodiment 1 of the present disclosure. Figure 2 is a partial cross-sectional view of the display device 1 according to Embodiment 1 of the present disclosure. Figure 3 is a partial cross-sectional view showing a state in which the transmittance of the transmittance control layer 20 of the display device 1 in Figure 2 is changed. 【0018】 The electronic device 100 is, for example, an electronic device having a display device 1 such as a laptop PC, tablet, or smartphone. In this embodiment, an example in which the electronic device 100 is a laptop PC will be described, as shown in Figure 1. 【0019】 In addition to the display device 1, the electronic device 100 may also include, for example, input devices such as a keyboard 2 and a touchpad 3, and a processor (not shown). 【0020】 As shown in Figures 2 and 3, the display device 1 mounted on the electronic device 100 comprises a display 10 and a transmittance control layer 20. 【0021】 The display 10 is composed of, for example, a liquid crystal display or an organic EL display. The display 10 has a main surface 10a for displaying images. As shown in Figures 2 and 3, the user directs their line of sight e1 toward the main surface 10a of the display 10. 【0022】As shown in Figure 2, the transmittance control layer 20 is positioned on the main surface 10a side of the display 10. The transmittance control layer 20 can control the amount of light incident on the display 10 from the main surface 10a side by controlling the transmittance within a predetermined range. Light incident on the display 10 is reflected by internal components of the display 10, such as glass or film. The transmittance control layer 20 can also control the amount of reflected light reflected by the internal components of the display 10. The transmittance control layer 20 can be controlled to reduce the amount of light incident on the display 10 and reflected light from the display 10 by lowering the transmittance, and to increase the amount of light incident on the display 10 by increasing the transmittance. 【0023】 The light incident on the display 10 is, for example, ambient light in the location where the electronic device 100 is being used. Ambient light includes, for example, light from lighting fixtures indoors or light coming in through windows, and light from sunlight or streetlights outdoors. 【0024】 The transmittance control layer 20 can control the transmittance in a range of, for example, 50% or more and less than 100%. It is also possible to set the transmittance to 50% or less, but in order to ensure visibility, it is preferable that the transmittance of the transmittance control layer 20 be 50% or more. When the transmittance of the transmittance control layer 20 is 100%, ambient light reaches the display 10 without being reflected or absorbed by the transmittance control layer 20. On the other hand, if the transmittance of the transmittance control layer 20 is reduced, a portion of the ambient light reaches the display 10 depending on the magnitude of the transmittance. 【0025】 The transmittance control layer 20 can be fixed to the main surface 10a of the display 10 by means of, for example, a transparent adhesive (Optical Clear Adhesive: OCA). 【0026】The thickness of the transmittance control layer 20 can be, for example, 100 μm or more and 1 mm or less. As described above, the transmittance of the transmittance control layer 20 varies between 50% and less than 100%. When the transmittance is 50% or more, the thickness of the transmittance control layer 20 can be reduced compared to when the transmittance is lower than 50%. In this embodiment, the thickness of the transmittance control layer 20 can be 1 mm or less. Furthermore, by setting the thickness of the transmittance control layer 20 to 100 μm or more, the transmittance can be controlled to an appropriate value of 50% or more. Because the thickness of the transmittance control layer 20 is 1 mm or less, the amount of ambient light incident on the display 10 and reflected light from the display 10 can be controlled without reducing the visibility of the image displayed on the display 10. 【0027】 The ambient contrast ratio (ACR) can be controlled by controlling the amount of light incident on the display 10 using the transmittance control layer 20. For example, if the transmittance of the transmittance control layer 20 is reduced, thereby reducing the amount of light incident on the display 10 and the amount of light reflected from the display 10, the ACR value will increase. Conversely, if the transmittance of the transmittance control layer 20 is increased, thereby increasing the amount of light incident on the display 10, the ACR value will decrease. 【0028】 For example, when using the electronic device 100 in a place with strong ambient light, such as outdoors on a sunny day, the ACR value can be increased by lowering the transmittance of the transmittance control layer 20. A higher ACR value improves visibility without increasing the brightness of the display, even in places with strong ambient light. 【0029】 Furthermore, in places with weaker ambient light than outdoors, such as indoors, visibility can be improved by increasing the transmittance of the transmittance control layer 20 to prevent a decrease in the brightness of the display 10. 【0030】 Referring to Figures 2 and 3, the relationship between the transmittance of the transmittance control layer 20 and the ACR will be explained. 【0031】When the transmittance of the transmittance control layer 20 shown in FIG. 2 is 100%, the value obtained by converting the environmental light L1 incident on the display 10 into luminance is L ａｍｂ Assuming this, the value obtained by converting the environmental light L2 reflected by the display 10 into luminance is L ａｍｂ multiplied by the reflectance R of the display 10. Also, the luminance of the light L3 emitted from the display 10 during white display is L ｗ and the luminance during black display is L ｋ Assuming this, the luminance including the environmental light during white display is L ｗ plus L[[ID=1)) ａｍｂ R, and the luminance including the environmental light during black display is L ｋ plus L ａｍｂ R. Since the contrast ratio of the display 10 is the ratio of the luminance between white display and black display, the magnitude of the contrast ratio ACR1 under environmental light is calculated by Equation (1). 【0032】 【0033】 When the transmittance of the transmittance control layer 20 shown in FIG. 3 is less than 100%, the environmental light L12 reflected by the display 10 passes through the transmittance control layer 20 twice, and the light L13 emitted from the display 10 passes through the transmittance control layer 20 once. Therefore, the luminance of the light L13 emitted from the display 10 during white display and black display is the luminance L ｗ during white display and the luminance L ｋ during black display multiplied by the transmittance T of the transmittance control layer 20, which is L ｗ T and L ｋ T. Also, the luminance of the environmental light L12 reflected by the display 10 is the luminance L ａｍｂ of the environmental light multiplied by the reflectance R of the display 10 and the square of the transmittance T of the transmittance control layer 20, which is L ａｍｂ RT<9000015>Therefore, the contrast ratio ACR2 of the display 10 when the transmittance of the transmittance control layer 20 is T is calculated by Equation (2). 【0034】 【0035】When comparing Formula (1) and Formula (2), ACR2 becomes a larger value than ACR1. This is because, as shown in Formula (3), T < 1 and L ｗ > L ｋ Under the conditions of, that is, the transmittance of the transmittance control layer 20 is less than 1 and the luminance during white display is greater than the luminance during black display, the value obtained by subtracting Formula (1) from Formula (2) is always a positive value. 【0036】 【0037】 Therefore, reducing the transmittance T of the transmittance control layer 20 increases the value of ACR. If the value of the transmittance T is too small, the luminance of the display 10 decreases, and conversely, the visibility deteriorates. For this reason, it is preferable to set a minimum value for the transmittance T. The minimum value of the transmittance T can be, for example, 50%. 【0038】 The transmittance control layer 20 can be constituted by, for example, a photochromic material. A photochromic material is a material whose color changes when light hits it. By using the property that the color changes when light hits it, the transmittance can be changed according to the intensity of ambient light in the transmittance control layer 20. By constituting the transmittance control layer 20 with a photochromic material, the transmittance of the transmittance control layer 20 decreases when the ambient light is strong, and the transmittance of the transmittance control layer 20 increases when the ambient light is weak. Therefore, the transmittance of the transmittance control layer 20 can be changed according to the intensity of ambient light. 【0039】 For example, when the electronic device 100 is taken out of the room to the outside and the display device 1 receives ambient light stronger than the ambient light in the room, the photochromic material of the transmittance control layer 20 reacts to the ambient light and gradually decreases the transmittance. The transmittance of the transmittance control layer 20 may gradually change, for example, during a predetermined period. The predetermined period can be, for example, a period of 1 second or more and 10 seconds or less. 【0040】 [Effect] According to the above-described embodiment, the following effects can be achieved. 【0041】The display device 1 comprises a display 10 and a transmittance control layer 20. The display 10 has a main surface 10a for displaying images. The transmittance control layer 20 is positioned on the main surface 10a side of the display 10 and controls the amount of light incident on the display 10 by changing its transmittance within a predetermined range. 【0042】 This configuration makes it possible to provide a display device 1 with improved visibility both outdoors and indoors. 【0043】 The specified range may be 50% or more but less than 100%. 【0044】 This configuration allows the contrast ratio of the display 10 in a bright room to be maintained at an appropriate value, thereby improving the visibility of the display device 1. 【0045】 The transmittance of the transmittance control layer 20 may change depending on the intensity of ambient light. 【0046】 This configuration allows for moderate transmission of light from the display 10 while controlling the amount of ambient light incident on the display 10, thereby further improving the visibility of the display device 1. 【0047】 The transmittance control layer 20 may decrease its transmittance when the ambient light intensity increases, and increase its transmittance when the ambient light intensity decreases. 【0048】 With this configuration, the ambient light incident on the display 10, the reflected light from the display 10, and the light emitted from the display 10 can be maintained at appropriate levels, further improving the visibility of the display device 1. 【0049】 The transmittance of the transmittance control layer 20 may change gradually over a predetermined period of time. 【0050】 This configuration allows the transmittance of the transmittance control layer 20 to be changed without causing any discomfort to the user. 【0051】 The transmittance control layer 20 may be made of a photochromic material. 【0052】With this configuration, the transmittance of the transmittance control layer 20 can be automatically changed according to the intensity of ambient light. 【0053】 The thickness of the transmittance control layer 20 may be 100 μm or more and 1 mm or less. 【0054】 With this configuration, the transmittance of the transmittance control layer 20 can be controlled to an appropriate value. 【0055】 In the above-described embodiment, the example in which the electronic device 100 is a laptop PC was explained, but it is not limited to this. The electronic device 100 may be any device having a display device such as a tablet, smartphone, or in-vehicle electronic device. 【0056】 Furthermore, although the above-described embodiment described an example in which the transmittance of the transmittance control layer 20 gradually changes over a predetermined period, the embodiment is not limited to this. The transmittance of the transmittance control layer 20 may change instantaneously or over time. 【0057】 It is preferable to select a material for the transmittance control layer 20 that exhibits minimal change in transmitted color (transmission spectrum) so that the display color of the display 10 does not change even when the transmittance changes. The material constituting the transmittance control layer 20 should, for example, have a white chromaticity (W) in the CIE 1931 color space of the display 10 within the range in which the transmittance is changed. ｘ , W ｙ It is desirable that the changes in the x and y values ​​of ) fall within ±0.01. 【0058】 [Modification] Figure 4 is a schematic partial cross-sectional view showing a display device 1A according to modification 1 of Embodiment 1. As shown in Figure 4, the display device 1A may include optical bonding 31 and an anti-reflective coating layer 32. 【0059】The optical bonding 31 is composed of an optically clear adhesive (OCA) or optically clear resin (OCR) for bonding the transmittance control layer 20 to the main surface 10a of the display 10. By laminating the transmittance control layer 20 to the main surface 10a of the display 10 via the optical bonding 31, it is possible to prevent the formation of an air layer between the transmittance control layer 20 and the display 10. The optical bonding 31 is formed to a thickness of, for example, 50 μm to 200 μm. 【0060】 The anti-reflective coating layer 32 is positioned on the main surface 10a side of the display 10. The anti-reflective coating layer 32 can be formed, for example, by an AR (Anti-Reflection) coating or an AG (Anti-Glare) coating. By providing the anti-reflective coating layer 32 on the main surface 10a side of the display 10, surface reflection or glare can be suppressed. The anti-reflective coating layer 32 is formed to a thickness of, for example, 0.1 μm or more and 10 μm or less. 【0061】 Figure 5 is a schematic partial cross-sectional view showing a display device 1B according to a modified example 2 of Embodiment 1. As shown in Figure 5, the display device 1B may include a touch panel 33. 【0062】 The touch panel 33 is an input device that receives input from the user. Various types of touch panels can be used as the touch panel 33, such as capacitive, resistive, surface acoustic wave, infrared, or electromagnetic induction touch panels. 【0063】The touch panel 33 is laminated onto the transmittance control layer 20 via, for example, optical bonding 34. The optical bonding 34 adheres the touch panel 33 to the transmittance control layer 20 and can be made of the same material as the optical bonding 31. As shown in Figure 5, in the display device 1B, the transmittance control layer 20 is laminated onto the main surface 10a of the display 10 via optical bonding 31, and the touch panel 33 is laminated onto the transmittance control layer 20 via optical bonding 34. The optical bonding 34 is formed to a thickness of, for example, 100 μm or more and 300 μm or less. Furthermore, an anti-reflective coating layer 32 may be laminated on the surface of the touch panel 33. 【0064】 By laminating the touch panel 33 onto the surface of the transmittance control layer 20, damage to the transmittance control layer 20 can be suppressed. 【0065】 Figure 6 is a schematic partial cross-sectional view showing a display device 1C according to a modified example 3 of Embodiment 1. As shown in Figure 6, a touch panel 33 may be laminated on the main surface 10a of the display 10, and a transmittance control layer 20 may be laminated on the touch panel 33. 【0066】 As shown in Figure 6, in the display device 1C, a touch panel 33 is placed on the main surface 10a of the display 10 via optical bonding 34. Furthermore, a transmittance control layer 20 is laminated on the surface of the touch panel 33 via optical bonding 31. An anti-reflective coating layer 32 may also be laminated on the surface of the transmittance control layer 20. 【0067】 With this configuration, a transmittance control layer 20 is provided on the front surface of the touch panel 33, allowing for the control of light reflected from ambient light by the sensor film of the touch panel 33, and also making it possible to retrofit the transmittance control layer 20 to existing display devices. 【0068】(Embodiment 2) Embodiment 2 will be described with reference to Figure 7. In Embodiment 2, components that are the same as or equivalent to those in Embodiment 1 will be denoted by the same reference numerals. Also, in Embodiment 2, descriptions that overlap with those in Embodiment 1 will be omitted. 【0069】 Figure 7 is a schematic block diagram showing the configuration of the display device 1D according to Embodiment 2. As shown in Figure 7, the display device 1D differs from Embodiment 1 in that it includes a control unit 40. It also differs from Embodiment 1 in that the transmittance control layer 21 is made of an electrochromic material or a guest-host type liquid crystal. 【0070】 In this embodiment, the transmittance control layer 21 is composed of an electrochromic material or a guest-host type liquid crystal dimming element. 【0071】 Electrochromic materials are materials that undergo chemical changes such as oxidation-reduction reactions when a voltage is applied, resulting in a reversible change in color. Because electrochromic materials have a so-called memory property, meaning they can maintain their color even without applying voltage once the color has changed, power consumption in the transmittance control layer 21 can be reduced. Examples of electrochromic materials include tungsten oxide and Prussian blue. As for the electrochromic material, it is preferable to select a material with minimal change in transmitted color (transmission spectrum) so that the display color of the display 10 does not change even when the transmittance changes. Within the range where the transmittance is changed, for example, the white chromaticity (W) of the display 10 in the CIE 1931 color space... ｘ , W ｙ It is desirable that the changes in the x and y values ​​of ) fall within ±0.01. 【0072】A guest-host liquid crystal is composed of a dichroic dye (guest) dissolved in a liquid crystal (host). In a guest-host liquid crystal, the orientation direction of the liquid crystal molecules changes when a voltage is applied. The dichroic dye changes its orientation direction in accordance with the orientation of the liquid crystal molecules. Because the dichroic dye has different light absorption rates depending on the axial direction, the transmittance of the transmittance control layer 21 can be changed by applying a voltage. Even when using a guest-host liquid crystal, it is preferable to select a material that minimizes the change in display color when changing the transmittance. 【0073】 The control unit 40 controls the display 10 and the transmittance control layer 21. The control unit 40 includes, for example, a memory that stores a program and a processing circuit corresponding to a processor such as a CPU (Central Processing Unit). The functions of the control unit 40 may be composed solely of hardware, or they may be realized by a combination of hardware and software. The control unit 40 realizes predetermined functions by reading data and programs stored in memory and performing various arithmetic operations. 【0074】 The control unit 40 can change the transmittance of the transmittance control layer 21 by applying a voltage to the transmittance control layer 21, for example, in response to user instructions. Alternatively, for example, the user may select a transmittance of the transmittance control layer 21 within a predetermined range, and the control unit 40 may set the transmittance of the transmittance control layer 21 to the value selected by the user. 【0075】 Furthermore, the control unit 40 may output information to notify the user that the transmittance of the transmittance control layer 21 is changing. Based on the information notifying the user that the transmittance is changing, the control unit 40 can output it as a message or indicator to the display device 1D, or as audio information to the speaker. 【0076】 [Effects] According to the above-described embodiment, the following effects can be achieved. 【0077】 The transmittance control layer 21 is composed of an electrochromic material or a guest-host type liquid crystal. 【0078】With this configuration, the transmittance of the transmittance control layer 21 can be freely changed. 【0079】 The display device 1D may further include a control unit 40 that controls the display 10 and the transmittance control layer 21. The control unit 40 may output information to notify the user that the transmittance of the transmittance control layer 21 is changing. 【0080】 This configuration allows the user to be notified when the transmittance of the transmittance control layer 21 changes, thereby improving user convenience. 【0081】 Furthermore, the transmittance control layer 21 may control the amount of light incident on a portion of the display 10. For example, by patterning electrodes for applying voltage to the transmittance control layer 21, the transmittance of a predetermined region of the transmittance control layer 21 can be changed while the transmittance of other regions remains unchanged. In this case, the transmittance of the region of the transmittance control layer 21 corresponding to the region of the display 10 where particularly improved visibility is desired can be changed. 【0082】 [Modified Example] Figure 8 is a schematic block diagram showing the configuration of the display device 1E according to Modified Example 1 of Embodiment 2. As shown in Figure 8, the display device 1E may also include an illuminance sensor 50. 【0083】 The illuminance sensor 50 is a sensor that detects the intensity of ambient light. The illuminance sensor 50 detects the intensity of ambient light around the display device 1E and outputs the detected ambient light intensity to the control unit 40. The control unit 40 can change the transmittance of the transmittance control layer 21 based on the ambient light intensity detected by the illuminance sensor 50. For example, the control unit 40 can lower the transmittance of the transmittance control layer 21 when the ambient light intensity around the display device 1E is high, and raise the transmittance of the transmittance control layer 21 when the ambient light intensity is low. By equipping the display device 1E with the illuminance sensor 50, the transmittance of the transmittance control layer 21 can be automatically changed according to the ambient light intensity, without user instruction. 【0084】The display device 1E does not necessarily have to be equipped with an illuminance sensor 50. In this case, the display device 1E can obtain information regarding the intensity of ambient light from an external device such as a server. 【0085】 (Note) The above description of embodiments discloses the following technology. 【0086】 (Technology 1) A display device comprising a display having a main surface for displaying an image, and a transmittance control layer disposed on the main surface side of the display, which controls the amount of ambient light incident on the display by changing its transmittance within a predetermined range. 【0087】 This configuration makes it possible to provide a display device with improved visibility both outdoors and indoors. 【0088】 (Technology 2) The display device according to Technology 1, wherein the predetermined range is 50% or more and less than 100%. 【0089】 This configuration allows the display's light-room contrast ratio to be maintained at an appropriate value, thereby improving the visibility of the display device. 【0090】 (Technology 3) The display device according to Technology 1 or 2, wherein the transmittance of the transmittance control layer changes according to the intensity of ambient light. 【0091】 This configuration allows for moderate light transmission from the display while controlling the amount of ambient light incident on the display, thereby further improving the visibility of the display device. 【0092】 (Technology 4) A display device according to any one of Technologies 1 to 3, wherein the transmittance control layer decreases when the intensity of ambient light increases and increases when the intensity of ambient light decreases. 【0093】 This configuration allows the ambient light entering the display to be maintained at an appropriate level, thereby further improving the visibility of the display device. 【0094】 (Technology 5) A display device according to any one of Technologies 1 to 4, wherein the change in transmittance of the transmittance control layer changes gradually over a predetermined period of time. 【0095】This configuration allows the transmittance of the transmittance control layer to be changed without causing any discomfort to the user. 【0096】 (Technology 6) The display device according to any one of Technologies 1 to 5, wherein the transmittance control layer is made of a photochromic material. 【0097】 This configuration allows the transmittance of the transmittance control layer to be automatically changed according to the intensity of ambient light. 【0098】 (Technology 7) The display device according to any one of Technologies 1 to 5, wherein the transmittance control layer is composed of an electrochromic material or a guest-host type liquid crystal. 【0099】 This configuration allows the transmittance of the transmittance control layer to be freely changed. 【0100】 (Technical 8) The display device according to Technical 7, further comprising a control unit for controlling the display and the transmittance control layer, wherein the control unit outputs information to notify the user that the transmittance is changing when the transmittance of the transmittance control layer is changing. 【0101】 This configuration allows the user to be notified when the transmittance of the transmittance control layer changes, thereby improving user convenience. 【0102】 (Technical 9) The display device according to Technical 7, further comprising a control unit for controlling the display and the transmittance control layer, and an illuminance sensor for detecting the intensity of ambient light, wherein the control unit changes the transmittance of the transmittance control layer based on the intensity of ambient light detected by the illuminance sensor. 【0103】 This configuration allows the transmittance of the transmittance control layer to be automatically changed according to the intensity of ambient light. 【0104】 (Technology 10) A display device according to any one of Technologies 1 to 9, wherein the transmittance control layer controls the amount of light incident on a portion of the display. 【0105】 This configuration makes it possible to change the transmittance of the transmittance control layer region corresponding to the area of ​​the display where you particularly want to improve visibility. 【0106】 (Technical 11) A display device according to any one of Technical 1 to 10, wherein the thickness of the transmittance control layer is 100 μm or more and 1 mm or less. 【0107】 This configuration allows the transmittance of the transmittance control layer to be controlled to an appropriate value. 【0108】 (Technology 12) A display device according to any one of Technologies 1 to 11, wherein the transmittance control layer is laminated on the main surface of the display via optical bonding. 【0109】 This configuration prevents the formation of an air layer between the transmittance control layer and the display. 【0110】 (Technical 13) The display device according to Technical 12, further comprising a touch panel which is laminated on the transmittance control layer via optical bonding and accepts input from a user. 【0111】 With this configuration, the touch panel functions as a protective layer for the transmittance control layer, thereby suppressing damage to the transmittance control layer. 【0112】 (Technical 14) The display device according to any one of Technical 1 to 11, further comprising a touch panel which is laminated on the main surface of the display via optical bonding and receives input from a user, wherein the transmittance control layer is laminated on the touch panel via optical bonding. 【0113】 This configuration makes it possible to retrofit a transmittance control layer to existing display devices. 【0114】 (Technical 15) The display device according to any one of Technical 1 to 14, further comprising an anti-reflective layer disposed on the main surface side of the display. 【0115】 This configuration makes it possible to suppress surface reflections or glare. 【0116】(Technology 16) A display device according to any one of Technologies 1 to 15, wherein the transmittance control layer is made of a material in which the change in the x and y values ​​of white chromaticity in the CIE 1931 color space is within 0.01 within the range of transmittance change. 【0117】 This configuration can further improve the visibility of the display device. 【0118】 (Technology 17) An electronic device comprising one of the display devices described in Technology 1 to 16. 【0119】 This configuration makes it possible to provide electronic devices with improved visibility in both areas with strong and weak ambient light. 【0120】 This disclosure is useful for display devices such as liquid crystal displays or organic EL displays. 【0121】 1, 1A-1E Display device 2 Keyboard 3 Touchpad 10 Display 10a Main surface 20, 21 Transmittance control layer 31, 34 Optical bonding 32 Anti-reflective coating layer 33 Touch panel 34 Optical bonding 40 Control unit 50 Illuminance sensor 100 Electronic device

Claims

1. A display device comprising: a display having a main surface for displaying an image; and a transmittance control layer disposed on the main surface side of the display, which controls the amount of ambient light incident on the display by changing its transmittance within a predetermined range.

2. The display device according to claim 1, wherein the predetermined range is 50% or more and less than 100%.

3. The display device according to claim 1 or 2, wherein the transmittance of the transmittance control layer changes according to the intensity of ambient light.

4. The display device according to any one of claims 1 to 3, wherein the transmittance control layer reduces the transmittance when the intensity of the ambient light increases and increases the transmittance when the intensity of the ambient light decreases.

5. The display device according to any one of claims 1 to 4, wherein the change in the transmittance of the transmittance control layer changes gradually over a predetermined period of time.

6. The display device according to any one of claims 1 to 5, wherein the transmittance control layer is made of a photochromic material.

7. The display device according to any one of claims 1 to 5, wherein the transmittance control layer is composed of an electrochromic material or a guest-host type liquid crystal.

8. The display device according to claim 7, further comprising: a display and a control unit for controlling the transmittance control layer, wherein the control unit outputs information to notify the user that the transmittance is changing when the transmittance of the transmittance control layer is changing.

9. The display device according to claim 7, further comprising: a control unit for controlling the display and the transmittance control layer; and an illuminance sensor for detecting the intensity of ambient light, wherein the control unit changes the transmittance of the transmittance control layer based on the intensity of ambient light detected by the illuminance sensor.

10. The display device according to any one of claims 1 to 9, wherein the transmittance control layer controls the amount of light incident on a portion of the display.

11. The display device according to any one of claims 1 to 10, wherein the thickness of the transmittance control layer is 100 μm or more and 1 mm or less.

12. The display device according to any one of claims 1 to 11, wherein the transmittance control layer is laminated on the main surface of the display via optical bonding.

13. The display device according to claim 12, further comprising a touch panel laminated on the transmittance control layer via optical bonding for receiving user input.

14. The display device according to any one of claims 1 to 11, further comprising: a touch panel laminated on the main surface of the display via optical bonding for receiving input from a user, wherein the transmittance control layer is laminated on the touch panel via optical bonding.

15. The display device according to any one of claims 1 to 14, further comprising an anti-reflective layer disposed on the main surface side of the display.

16. The display device according to any one of claims 1 to 15, wherein the transmittance control layer is made of a material in which the change in the x and y values ​​of white chromaticity in the CIE 1931 color space is within 0.01 within the range of transmittance change.

17. An electronic device comprising a display device according to any one of claims 1 to 16.

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