JP2006091857A - Display device and electronic appliance using the display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device and an electronic appliance using the display device which solves the problem that visibility is extremely decreased under strong outside light when outside light is stronger than light emitted from the light emitting element. <P>SOLUTION: According to the present invention, an optical sensor is incorporated to detect an intensity of outside light by monitoring outside light. In the case where strong outside light is detected, a background image of the display device is displayed in black so as to improve visibility of a display image. Besides, luminance of the display image is heightened to improve the visibility further. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a display device, and more particularly to a display device having a light emitting element. Further, the present invention relates to an electronic device including a display device having a light emitting element.

  In recent years, with the advance of communication technology, mobile phones have become widespread. In the future, transmission of moving pictures and more information using a mobile phone are expected. On the other hand, personal computers (PCs) are also being produced as mobile-friendly products due to their light weight. A large number of information terminals called PDAs that have begun in electronic notebooks are also being produced and spread. Also, with the development of display devices, most of these portable information devices are equipped with flat panel displays.

  Among active matrix display devices, in recent years, display devices using low-temperature polysilicon thin film transistors (hereinafter referred to as thin film transistors) are being commercialized. When a low-temperature polysilicon TFT is used, a signal line driver circuit can be formed around the pixel portion on the same substrate as the pixel portion, so that the display device can be reduced in size and high definition. In the future, further spread is expected.

In mobile phones, the shape has changed from a bar type to a folding type. Such a folding portable device is as shown in FIG. The foldable mobile phone includes a first housing 201, a second housing 202, a display unit 203, a speaker 204, an antenna 205, a hinge 206, an operation key 207, and a microphone 208 (for example, Patent Document 1). reference.).
JP 2001-326710 A

  In a conventional mobile phone using a light emitting element, when strong external light such as sunlight is received, the light emitted from the light emitting element is lost to the external light and the display cannot be seen. As shown in FIG. 2B, in strong external light, the display screen is almost recognized by the user as black. In a display device using liquid crystal, this problem is solved by using a reflective liquid crystal display device. However, a display device using a light emitting element is problematic because a similar solution cannot be applied in principle.

  In view of the above problems, it is an object of the present invention to provide a display device that uses a light-emitting element and can recognize the display even under strong external light, and an electronic device using the display device.

  The gist of the present invention is to improve the visibility by switching the brightness of the background image of the display screen of the display device having a light emitting element according to the intensity of external light, that is, the brightness of the surroundings. That is, according to the present invention, the contrast between the sensor for detecting the intensity of outside light, that is, the brightness of the surroundings, the background image of the display screen, and the display image (characters, figures, symbols, etc.) to be displayed is determined. A display device including a controller for switching as appropriate and an electronic device using the display device.

  According to the present invention, the intensity of external light is detected by the sensor, and when a certain intensity or more is detected, the background image of the display screen is darkened from the white background to the black background by the controller. Then, the display image is white or brightly displayed close to white by the controller. By switching the state of the display screen according to the ambient brightness, the display image can be clearly displayed. In addition, by making the display darker than the black background and making the displayed characters, figures, symbols, etc. white or bright display close to white, the number of brightly emitting pixels decreases, so the power required for display Can be concentrated on the pixel. Thereby, the visibility of the display screen can be further improved.

  A display screen configured to display a display image and a background image formed by a plurality of light emitting elements on a substrate, a light sensor for detecting external light, and a controller for controlling the brightness of the background image according to the output of the light sensor. It is characterized by having.

  A display screen configured to display a display image and a background image formed of a plurality of light emitting elements on a substrate, a light sensor for detecting external light, and a brightness of the background image and a brightness of the display image according to the output of the light sensor. It has a controller which controls together.

  A display screen configured to display a display image and a background image formed of a plurality of light emitting elements on a substrate, a light sensor for detecting external light, and a first image for controlling the brightness of the background image according to the output of the light sensor. It has a controller and a second controller for controlling the brightness of the display image.

  The screen brightness of the background image when the illuminance of outside light is high is smaller than the screen brightness of the background image when the illuminance of outside light is low.

  The brightness of the display image when the illuminance of outside light is high is higher than the brightness of the display image when the illuminance of outside light is low.

  The optical sensor is formed on a substrate.

  A display screen configured to display a display image and a background image formed by a plurality of light emitting elements on a substrate, a light sensor that detects external light, and a controller that controls the brightness of the background image according to the output of the light sensor It is characterized by that.

  A display screen configured to display a display image and a background image formed of a plurality of light emitting elements on a substrate, a light sensor for detecting external light, and a brightness of the background image and a brightness of the display image according to the output of the light sensor. It is characterized by having a controller to control together.

  A display screen configured to display a display image and a background image configured by a plurality of light emitting elements on a substrate, an optical sensor for detecting external light, and a first image for controlling the luminance of the background image according to the output of the optical sensor. A controller and a second controller for controlling the brightness of the display image are provided.

  The screen brightness of the background image when the illuminance of outside light is high is smaller than the screen brightness of the background image when the illuminance of outside light is low.

  The light emitting elements are formed in a matrix.

  In the above, it is preferable that the luminance of the background image when the illuminance of the external light is 3000 lux or more is smaller than the luminance of the background image when the illuminance of the external light is smaller than 3000 lux. That is, it is preferable that the background image of the display screen when the surroundings are bright is provided with a controller that performs control such that the luminance is lower than the background image of the display screen when the surroundings are dark.

  In the above, it is preferable that the luminance of the display image when the illuminance of external light is 3000 lux or more is larger than the luminance of the display image when the illuminance of external light is smaller than 3000 lux. That is, it is preferable to include a controller that performs control such that the characters, graphics, symbols, and the like on the display screen when the surroundings are bright are larger than the characters, graphics, symbols, etc. on the display screen when the surroundings are dark.

  In the above, the photosensor is preferably formed on the same substrate as the light emitting element.

  As described above, in an environment with strong external light, a display device that allows the user to easily recognize the display can be achieved by displaying the display image in white on a black background, and a highly visible electronic device under strong external light. Equipment can be realized. In addition, when the background of the screen is a black background and the display image is displayed in white, power can be concentrated on the light emitting element for displaying the display image, and further visibility can be obtained.

  FIG. 3 shows an embodiment of the present invention. FIG. 3 is a block diagram of a display device using the present invention. A display device 300 according to this embodiment includes a controller 301, a memory 302, an optical sensor 303, an amplifier 304, a power supply 305, and a panel 306. The controller 301 generates signals necessary for the panel 306 based on control signals and video signals input from the outside. The memory 302 is mainly used for temporarily storing a video signal, but may be used for other purposes. The optical sensor 303 detects external light (light outside the display device 300). The amplifier 304 amplifies the output signal of the optical sensor 303 and sends it to the controller 301. However, the amplifier 304 does not have to be sufficient if the output signal of the optical sensor 303 is sufficiently large. A power source 305 supplies a necessary voltage or current to the panel 306. The panel 306 uses a light emitting element, and may use an electroluminescent (EL) element or an FED (field emission display).

When the optical sensor 303 receives strong external light, the output signal is sent to the controller 301 via the amplifier 304. The controller 301 sends a signal to the panel 306 according to the signal strength, and changes the luminance or color of the background image of the panel 306.
Specifically, when the external light is weak, the background image is white or a light color close to it, and the display image is black or a dark color close to it. When the outside light becomes strong, the background image is black or a dark color close to it, and the display image is white or a light color close to it.

In addition, when the outside light is strong, the background image is black, and the light emission power for displaying the background image is reduced. The reduced power can be used for display image display to increase the brightness of the display image. In this way, it is possible to further improve the visibility during strong external light.
In such a case, the luminance can be increased by sending a control signal for increasing the luminance from the controller 301 to the power source 305. The controller 301 may be a combination of at least one control circuit.

  FIG. 1 shows an embodiment of a mobile phone using the display device of the present invention. A cellular phone illustrated in FIG. 1A includes a first housing 101, a second housing 102, a display screen 103, a speaker 104, an antenna 105, a hinge 106, operation keys 107, a microphone 108, an optical sensor 109, and a substrate 110. It is made up of. The display device of the present invention is mounted in the first housing 101. In FIG. 1, the display screen 103 and the optical sensor 109 are formed on the substrate 110, but they may not be formed on the same substrate.

  FIG. 1A shows a display when the outside light is weak. On the display screen 103, black characters are displayed on a white background image. When the outside light is weak, the sensitivity of the eyes is matched with the light emission luminance of the display screen. When the outside light is strong, the white background image is lost to the outside light. Therefore, the optical sensor 109 detects the intensity of the outside light and changes the background image to the black background as shown in FIG. By making the background image black in this way, the area of the light emitting portion can be reduced. Then, by concentrating the power on the few white display portions, the white portions can be displayed more clearly. Note that strong external light in this specification means light of 3000 lux or more (preferably 5000 lux or more).

  In this embodiment, a mobile phone has been described. However, the present invention is not limited to this, and a PDA (Personal Digital Assistant), a video camera, a digital camera, a portable DVD (Digital Versatile Disc), a portable television, a game It can be used for electronic devices using various display devices such as devices and computers.

  FIG. 4 shows an example of a pixel of a time gray scale light emitting device. FIG. 4A illustrates a pixel for driving the light-emitting element 403 with time gradation. This pixel includes a light emitting element 403, a driving TFT 402, a storage capacitor 404, a counter electrode 405, and a switching TFT 401. The gate of the switching TFT 401 is connected to the gate signal line G1, and when the gate signal line G1 becomes high, the switching TFT 401 is turned on, and the data of the source signal line S1 is written to the storage capacitor 404 and the gate of the driving TFT 402. When the driving TFT 402 is turned on, a current flows from the power supply line V 1 to the light emitting element 403 through the driving TFT 402. This state is maintained until the next writing is performed. The light emitting element 403 is connected to the counter electrode 405.

  In this specification, the connection means an electrical connection.

  FIG. 4B shows a timing chart of time gradation. In this example, description will be made by taking 4 bits as an example, but it is not limited to 4 bits. One frame is composed of four subframes SF1 to SF4. Each subframe includes an address period (writing period) Ta1 to Ta4 and a sustain period (lighting period) Ts1 to Ts4. By setting the sustain period Ts1: Ts2: Ts3: Ts4 = 8: 4: 2: 1, each bit corresponds to the sustain period, and time gradation is possible. At this time, lighting is not performed during the address period, and only addressing is performed.

  In order to perform such time gray scale driving, a control circuit and a memory circuit for generating subframes are required. FIG. 6 shows a control circuit and a memory circuit. In this example, a 4-bit digital video signal is subjected to subframe conversion, but it is not particularly limited to 4 bits. The operation will be described below. First, the control circuit 602 inputs a digital video signal to the memory A 604 via the switch 603. When all the data of the first frame is input to the memory A 604, the switch 603 is switched to the memory B 605, and the digital video signal of the second frame is written.

  On the other hand, the switch 606 is sequentially connected to the memories 604_1 to 604_4 while writing the digital video signal of the second frame, and inputs the signal stored in the memory A 604 to the display 601. When all the data of the second frame is input to the memory B 605, the switch 603 is switched to the memory A 604, and the digital video signal of the third frame is written. The switch 606 is sequentially connected to the memories 605_1 to 605_4 while writing the digital video signal of the third frame, and inputs the signal stored in the memory B 605 to the display 601. By repeating the above, a subframe can be formed.

FIG. 7 shows an example of means for creating an image in which light and dark are reversed by inverting a signal. By this means, it is possible to display a black background display image on a white background image or a white background display image on a black background image. The signal output from the video signal selection switch 706 is input to the switch 707, and it is possible to select whether the signal from the video signal selection switch 706 is input to the display 701 as it is or inverted. If light-dark reversal is required, it may be reversed before input. This selection is made by the display controller. Note that the switch 703, the memory A 704, and the memory B 705 function in the same manner as the switch 603, the memory A 604, and the memory B 605 in FIG. The memories 704_1 to 704_4 and the memories 705_1 to 705_4 function similarly to the memories 604_1 to 604_4 and 605_1 to 605_4 in FIG.
In the present invention, the means for switching the luminance of the background image or the display image is not limited to this embodiment, and there is no problem even if the luminance is switched using other means.

  Embodiments of the present invention will be described with reference to the drawings. In this embodiment, a configuration of a display panel having a display screen and further having an optical sensor formed on a substrate will be described in detail.

  In FIG. 8A, a driving transistor 801, a first electrode (pixel electrode) 802, a light-emitting layer 803, and a second electrode (counter electrode) 804 formed using a light-transmitting material are provided over a substrate 800. ing. The light emitting element 825 emits light upward. Then, a photoelectric conversion element 838 including a stacked body of a P-type layer 831, an I-type (intrinsic) layer 832, and an N-type layer 833 is formed over the insulating film 812 formed over the second electrode 804, and the P-type layer 831. And an electrode 834 connected to the N-type layer 833 are provided.

  In this embodiment, a photoelectric conversion element 838 is used as an optical sensor. The light-emitting element 825 and the photoelectric conversion element 838 are formed over the same substrate 800, and light emitted from the light-emitting element 825 forms an image and is visually recognized by the user. On the other hand, the photoelectric conversion element 838 has a role of detecting external light and sending a detection signal to the controller. In this way, the light emitting element and the optical sensor (photoelectric conversion element) can be integrated on the same substrate, which can contribute to downsizing of the apparatus.

  FIG. 10 shows an example in which an optical sensor and a light emitting element are formed on the same substrate. In this embodiment, a source signal line driver circuit 1002, gate signal line driver circuits 1003 and 1004, a pixel portion 1005, and an optical sensor 1006 are integrally formed on the same substrate 1001, and an FPC (flexible printed circuit) 1007 is attached. Is. Although this cross-sectional view is shown in FIG. 8, the cross-sectional shape is not limited to this shape, and other shapes may be used.

In addition, the source signal line driver circuit 1002, the gate signal line driver circuits 1003 and 1004, and the optical sensor 1006 are attached by COG (chip on glass) without being limited to the method of integrally forming the optical sensor and the light emitting element on the same substrate. It is also possible.
This embodiment can be freely combined with the above-described embodiment and Embodiments 1 and 2.

  FIG. 5 shows an embodiment of a cellular phone using the display device of the present invention. A mobile phone illustrated in FIG. 5 includes a first housing 501, a second housing 502, a first display screen 503, a second display screen 504, a third display screen 505, a speaker 506, an antenna 507, and a hinge 508. , An operation key 509, a microphone 510, a battery 511, an optical sensor 512, and a substrate 520. FIG. 5 shows a state in which the external light is strong and the background image is black. FIG. 5A shows the inside of the mobile phone, FIG. 5B shows the outside, and FIG. 5C shows the side. The display device of the present invention is mounted in the first housing 501. Note that although the optical sensor 512 and the first display screen 503 are formed over the substrate 520, they may not be formed over the same substrate.

  In FIG. 5, two sub-display display screens (second display screen 504 and third display screen 505) are arranged, but the number is not limited to two. One may be sufficient and three or more may be sufficient.

  FIG. 9 shows the concept of the double-sided light emitting device used in this example. In FIG. 9, transparent electrodes or equivalent electrodes 903 to 905 and 909 exist between two transparent substrates 901 and 902, and light emitters 906 to 908 are sandwiched between these electrodes. Color filters 910 to 912 are arranged on the transparent substrate 901. When the light emitters 906 to 908 emit white light, full color display can be performed on the first light emitting surface and white display can be performed on the second light emitting surface. . The light emitters may be color-coded without using a color filter. In that case, the colors that can be displayed on the first light-emitting surface and the second light-emitting surface are the same. A light emitting element typified by an EL element is used as the light emitter. By adopting such a structure, the above double-sided light emitting display device is realized.

  Note that with respect to the double-sided light emitting device, it is possible to horizontally flip the image using the control circuit and the memory circuit of FIG. In this case, when calling the memory A 604 or the memory B 605 in FIG. 6, the video signal can be reversed left and right by calling the signal for each column of the display in reverse. Thus, in the light emitting device that performs subframe conversion, the above-described double-sided light emission can be handled by changing the memory calling order.

  The display device manufactured as described above can be used as a display portion of various electronic devices. Hereinafter, an electronic device in which a display device formed using the present invention is incorporated as a display medium will be described.

  Examples of such an electronic device include a camera (video camera, digital camera, etc.) game machine, car navigation, computer, portable information terminal (mobile computer, mobile phone, electronic book, etc.), and the like. An example of them is shown in FIG.

  FIG. 11A illustrates a digital camera, which includes a main body 3101, a display portion 3102, an image receiving portion 3103, operation keys 3104, an external connection port 3105, a shutter 3106, an audio output portion 3107, and the like. The display portion 3102 can be formed using the present invention to complete a digital camera. According to the present invention, a display portion with high visibility can be configured even under strong external light, and a digital camera easy to use for a user can be provided.

  FIG. 11B shows a personal computer, which includes a main body 3201, a housing 3202, a display portion 3203, a keyboard 3204, an external connection port 3205, a pointing mouse 3206, an audio output portion 3207, and the like. The display portion 3203 can be formed using the present invention to complete a personal computer. According to the present invention, a display portion with high visibility can be configured even under strong external light, and a personal computer that is easy for the user to use and has little eye fatigue can be provided.

  FIG. 11C illustrates a portable information terminal, which includes a main body 3301, a display portion 3302, a switch 3303, operation keys 3304, an infrared port 3305, an audio output portion 3306, and the like. A portable information terminal can be completed by forming the display portion 3302 in the present invention. According to the present invention, a display portion with high visibility can be configured even under strong external light, and a portable information terminal that is easy for a user to use can be provided.

  FIG. 11D illustrates an image reproduction device (specifically, a DVD reproduction device) provided with a recording medium, which includes a main body 3401, a housing 3402, a recording medium (CD, LD, or DVD) reading unit 3405, and operation keys 3406. , Voice output unit 3407 display unit A3403, display unit B3404, and the like. The display unit A mainly displays image information, and the display unit B mainly displays character information. By using the present invention, the display portion A 3403 and the display portion B 3404 can be configured to complete the image reproduction device. According to the present invention, a display portion with high visibility can be configured even under strong external light, and an image playback device that is easy for the user to use can be provided. Note that the present invention can be applied to a CD playback device, a game machine, or the like as an image playback device provided with a recording medium.

  FIG. 11E illustrates a foldable portable display device in which a main body 3501 is provided with a display portion 3502 and an audio output portion 3503. The display portion 3502 can be formed using the present invention to complete a foldable portable display device. According to the present invention, a display portion with high visibility can be configured even under strong external light, and a foldable portable display device that is easy for a user to use can be provided.

  FIG. 11F illustrates a portable information terminal that can be worn on a human arm by a belt 3601 and includes a display portion 3602, an audio output portion 3604, and an operation switch 3603. According to this portable information terminal, a television broadcast can be received and viewed. In addition, the date and time can be displayed on the display portion 3602. A portable information terminal can be completed by forming the display portion 3602 using the present invention. According to the present invention, a display portion with high visibility can be configured even under strong external light, and a portable information terminal that is easy to use for a user can be provided.

  FIG. 11G illustrates a cellular phone, which includes a main body 3701, a housing 3702, a display portion 3703, an audio input portion 3704, an antenna 3705, operation keys 3706, an external connection port 3707, an audio output portion 3708, and the like. The display portion 3703 can be formed using the present invention to complete a mobile phone. According to the present invention, a display portion with high visibility can be configured even under strong external light, and a mobile phone that is easy to use for a user can be provided.

  As described above, the application range of the present invention is extremely wide and can be applied to electronic devices in various fields. Moreover, the electronic device of a present Example is realizable even if it uses the structure which consists of what combination of Examples 1-4.

(A) A diagram showing a cellular phone using the present invention. FIG. 5B is a diagram showing a mobile phone using the present invention. (External light intensity) (A) A diagram showing a conventional mobile phone. (B) A diagram showing a conventional mobile phone. (External light intensity) The figure which shows embodiment of this invention. FIG. 5A illustrates a pixel of an active matrix light-emitting device. (B) Timing chart (A) The figure which shows the inner side of the double-sided light emission mobile telephone using this invention. (B) The figure which shows the outer side of the double-sided light emission mobile telephone using this invention. (C) Side view of a double-sided light emitting cellular phone using the present invention. The block diagram of a controller. The block diagram of a controller. The figure which shows the Example which integrated the sensor. The figure which shows the Example of double-sided light emission. The figure which shows the Example which integrated the sensor. FIG. 11 is a diagram showing an example of an electronic device using the present invention.

Explanation of symbols

101 first housing 102 second housing 103 display screen 104 speaker 105 antenna 106 hinge 107 operation key 108 microphone 109 optical sensor 110 substrate 201 first housing 202 second housing 203 display unit 204 speaker 205 antenna 206 Hinge 207 Operation key 208 Microphone 300 Display device 301 Controller 302 Memory 303 Optical sensor 304 Amplifier 305 Power supply 306 Panel 401 Switching TFT
402 Drive TFT
403 Light-emitting element 404 Holding capacitor 405 Counter electrode 501 First casing 502 Second casing 503 First display screen 504 Second display screen 505 Third display screen 506 Speaker 507 Antenna 508 Hinge 509 Operation key 510 Microphone 511 Battery 512 Photosensor 520 Substrate 601 Display 602 Control circuit 603 Switch 604 Memory A
604_1 Memory 604_2 Memory 604_3 Memory 604_4 Memory 605 Memory B
605_1 Memory 605_2 Memory 605_3 Memory 605_4 Memory 606 Switch 701 Display 702 Control circuit 703 Switch 704 Memory A
704_1 Memory 704_2 Memory 704_3 Memory 704_4 Memory 705 Memory B
705_1 Memory 705_2 Memory 705_3 Memory 705_4 Memory 706 Video signal selection switch 707 Switch 800 Substrate 801 Driving transistor 802 First electrode 803 Light emitting layer 804 Second electrode 812 Insulating film 825 Light emitting element 830 Electrode 831 P-type layer 832 I-type layer 833 N-type layer 834 Electrode 838 Photoelectric conversion element 901 Transparent substrate 902 Transparent substrate 903 Electrode 904 Electrode 905 Electrode 906 Light emitter 907 Light emitter 908 Light emitter 909 Electrode 910 Color filter 911 Color filter 912 Color filter 912 Color filter 1001 Substrate 1002 Source signal line driver circuit 1003 Gate signal line driver circuit 1004 Gate signal line driver circuit 1005 Pixel portion 1006 Optical sensor 1007 FPC
3101 Main unit 3102 Display unit 3103 Image receiving unit 3104 Operation key 3105 External connection port 3106 Shutter 3107 Audio output unit 3201 Main unit 3202 Case 3203 Display unit 3204 Keyboard 3205 External connection port 3206 Pointing mouse 3207 Audio output unit 3301 Main unit 3302 Display unit 3303 Switch 3304 Operation key 3305 Infrared port 3306 Audio output unit 3401 Main body 3402 Case 3403 Display unit A
3404 Display B
3405 Recording medium reading unit 3406 Operation key 3407 Audio output unit 3501 Main unit 3502 Display unit 3503 Audio output unit 3601 Belt 3602 Display unit 3603 Operation switch 3604 Audio output unit 3701 Main unit 3702 Display unit 3703 Audio input unit 3705 Antenna 3706 Operation key 3707 External connection port 3708 Audio output unit

Claims (14)

A display screen for displaying a display image and a background image constituted by a plurality of light emitting elements on a substrate;
An optical sensor for detecting outside light;
A display device comprising a controller for controlling luminance of the background image in accordance with an output of the photosensor. A display screen for displaying a display image and a background image constituted by a plurality of light emitting elements on a substrate;
An optical sensor for detecting outside light;
A display device comprising: a controller that controls the luminance of the background image and the luminance of the display image together according to the output of the photosensor. A display screen for displaying a display image and a background image constituted by a plurality of light emitting elements on a substrate;
An optical sensor for detecting outside light;
A display device comprising: a first controller that controls the luminance of the background image and a second controller that controls the luminance of the display image in accordance with the output of the photosensor.   4. The display according to claim 1, wherein the screen luminance of the background image when the illuminance of external light is high is lower than the screen luminance of the background image when the illuminance of external light is low. apparatus.   4. The display device according to claim 2, wherein the luminance of the display image when the illuminance of external light is high is larger than the luminance of the display image when the illuminance of external light is low.   The display device according to claim 1, wherein the optical sensor is formed on the substrate.   The display device according to claim 1, wherein the light emitting elements are formed in a matrix. A display screen for displaying a display image and a background image constituted by a plurality of light emitting elements on a substrate;
An optical sensor for detecting outside light;
An electronic apparatus comprising: a controller that controls luminance of the background image in accordance with an output of the photosensor. A display screen for displaying a display image and a background image constituted by a plurality of light emitting elements on a substrate;
An optical sensor for detecting outside light;
An electronic apparatus comprising a controller that controls the luminance of the background image and the luminance of the display image together according to the output of the photosensor. A display screen for displaying a display image and a background image constituted by a plurality of light emitting elements on a substrate;
An optical sensor for detecting outside light;
An electronic apparatus comprising: a first controller that controls the brightness of the background image and a second controller that controls the brightness of the display image in accordance with the output of the photosensor.   10. The electronic device according to claim 7, wherein the screen luminance of the background image when the illuminance of the external light is high is smaller than the screen luminance of the background image when the illuminance of the external light is low. machine.   11. The electronic device according to claim 9, wherein the luminance of the display image when the illuminance of external light is high is larger than the luminance of the display image when the illuminance of external light is low.   13. The electronic device according to claim 8, wherein the optical sensor is formed on the substrate. The electronic device according to claim 8, wherein the light emitting elements are formed in a matrix.

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