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Display device provided with optical sensor

A display device and optical sensor technology, applied in the direction of identification devices, instruments, optics, etc., can solve the problems of difficult to distinguish between images and backgrounds, and cannot correctly detect the touch position, so as to achieve uniform state and eliminate the influence of displayed images

Inactive Publication Date: 2011-01-19
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a method of image detection, when the illuminance of external light is low (dark surroundings), it is difficult to distinguish the image from the background in the image obtained by the light sensor, and the touch position cannot be accurately detected.

Method used

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  • Display device provided with optical sensor
  • Display device provided with optical sensor
  • Display device provided with optical sensor

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Experimental program
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Effect test

no. 1 approach

[0092] figure 1 It is a block diagram showing the configuration of the liquid crystal display device according to the first embodiment of the present invention. figure 1 The illustrated liquid crystal display device 10 includes a liquid crystal panel 11 with a built-in sensor, an image processing unit 12 , an A / D conversion unit 13 , a backlight power supply circuit 14 , and a backlight 15 . The image processing unit 12 includes a frame memory 16 . The sensor-built-in liquid crystal panel 11 (hereinafter referred to as liquid crystal panel 11 ) includes a panel drive circuit 17 and a pixel array 18 including a plurality of pixel circuits and a plurality of photosensors arranged two-dimensionally (details will be described later). The liquid crystal display device 10 has a touch position detection function and an image input function in addition to the image display function.

[0093] Display data D1 and an output control signal OC are input to the liquid crystal display de...

no. 2 approach

[0142] Figure 10 It is a block diagram showing the configuration of a liquid crystal display device according to a second embodiment of the present invention. Figure 10 The illustrated liquid crystal display device 20 includes a liquid crystal panel 21 with a built-in sensor, an image processing unit 22 , an A / D converter 13 , a backlight power supply circuit 14 , and a backlight 15 . The sensor-built-in liquid crystal panel 21 (hereinafter referred to as liquid crystal panel 21 ) includes a panel drive circuit 27 and a pixel array 18 . In each of the following embodiments, the same reference numerals are given to the same components as those in the above-described embodiments among the components of the respective embodiments, and description thereof will be omitted.

[0143] The image processing unit 22 performs frame rate conversion processing, operation mode selection processing, backlight control processing, scanned image generation processing, and image recognition proc...

no. 3 approach

[0147] Regarding the third embodiment, an example of the usage of the liquid crystal display devices of the first and second embodiments will be described. Figure 11 It is a block diagram showing the configuration of a business card reading device according to a third embodiment of the present invention. Figure 11 The shown business card reading device 60 includes the liquid crystal display device 10 of the first embodiment and a display control unit 61 .

[0148] The display control unit 61 is a control unit of the liquid crystal display device 10 and includes a CPU 62 and a main memory 63 . The main memory 63 stores a business card reading program 64 , and the CPU 62 executes the business card reading program 64 on the main memory 63 . The display control unit 61 configured in this way outputs the display data D1 and the output control signal OC to the liquid crystal display device 10 , and performs predetermined processing on the coordinate data Co and the imaging data S...

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Abstract

Provided is a display device having a plurality of optical sensors on a display panel. A liquid crystal panel (11) having a built-in sensor includes a plurality of pixel circuits and a plurality of optical sensors which are two-dimensionally arranged in a pixel array (18). A panel driving circuit (17) writes a signal on the pixel circuit corresponding to display data (D3), and reads out signals from the optical sensors corresponding to a receiving light quantity. An image processing section (12) switches display data to be used prior to reading out the signals by the panel driving circuit (17) to fixed data suitable for image input. As the fixed data, white image data and blue image data are used. Image input and touch position detection can be performed at a high accuracy, irrespective of the display image, by eliminating influence of the display image by inputting the image after displaying the image suitable for image input by using the fixed data. The display device can be used for a liquid crystal display device.

Description

technical field [0001] The present invention relates to a display device, especially a display device with a plurality of light sensors arranged on a display panel. Background technique [0002] In recent years, electronic devices that can be operated by touching a screen with a finger, a pen, or the like have become widespread. Also, as a method of detecting a touch position on a display screen, a method of providing a plurality of photosensors on a display panel and using the photosensors to detect an image formed when a finger or the like approaches the screen is known. As a method for detecting images, when the illuminance of external light is low (the surrounding is dark), it is difficult to distinguish the image from the background in the image obtained by the optical sensor, and the touch position cannot be accurately detected. Therefore, there is also known a method in which a display device including a backlight detects a reflected image when the backlight reaches ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/133G02F1/1335G02F1/13357G02F1/1345G02F1/1368G09F9/00G09G3/20G09G3/34G09G3/36G06F3/041H04N25/00
CPCG06F3/0412G09G3/2092G06F3/042G09G3/3648G09G2300/0809G09G2320/0257G09G3/3688G02F2001/13312G09G2360/148G02F1/13338G02F1/13312
Inventor 藤冈章纯久保田章敬植畑正树
Owner SHARP KK
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