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Display device having optical sensors

A technology of light sensor and display device, which is applied in the input/output process of instruments, static indicators, data processing, etc., can solve the problems of difficulty in distinguishing images and backgrounds, unable to detect the touch position correctly, and achieves a reduction in the number of circuits. Effect

Inactive Publication Date: 2011-02-09
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Image detection method 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 optical sensor, and the touch position may not be detected correctly

Method used

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  • Display device having optical sensors
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  • Display device having optical sensors

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no. 1 Embodiment approach

[0076] 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 sensor built-in liquid crystal panel 11 , a display data processing unit 12 , an A / D converter 13 , a sensor data processing unit 14 , and a backlight 15 . The sensor-embedded liquid crystal panel 11 (hereinafter referred to as liquid crystal panel 11 ) includes a panel drive circuit 16 and a pixel array 17 including a plurality of pixels 1 and a plurality of photosensors 2 arranged two-dimensionally. Each pixel 1 includes three pixel circuits corresponding to red, green, and blue. Hereinafter, m is described as an even number of 2 or more, n is described as an integer of 2 or more, and m / 2 is described as s.

[0077] The display data D1 is externally input to the liquid crystal display device 10 . The display data processing unit 12 performs col...

no. 2 Embodiment approach

[0108] The liquid crystal display device according to the second embodiment of the present invention has the same configuration as the liquid crystal display device 10 according to the first embodiment, and performs the same operation. In the liquid crystal display device of this embodiment, the arrangement position of the optical sensor 2 is different from that of the liquid crystal display device 10 , and the sensor readout line and the sensor reset line corresponding to the arrangement position of the optical sensor 2 are provided on the liquid crystal panel. Next, first to sixth examples of the arrangement positions of the photosensors 2 in the liquid crystal panel included in the liquid crystal display device according to the present embodiment will be described.

[0109] Figure 10 It is a figure which shows the 1st example of the arrangement|positioning position of the optical sensor 2. exist Figure 10 In the illustrated example, the photosensors 2 are provided corre...

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Abstract

A liquid crystal panel (11) incorporating sensors includes a plurality of pixels (1) arranged in rows and columns and a plurality of optical sensors (2), in a pixel array (17). The optical sensors (2) are provided corresponding to the pixels (1) in every other row (for example, corresponding to the pixels (1) in the even-numbered rows). A panel driving circuit (16) performs one-line inversion driving and reads out a signal according to an amount of light received from the optical sensors (2). Since the output of the optical sensors (2) changes in the same direction under the influence of display data, stripe noise, which is caused by switching between the polarities of write voltage of a pixel circuit (3), can be prevented from being generated in an image which is formed based on the output of the optical sensors (2).

Description

technical field [0001] The present invention relates to a display device, in particular to a display device provided with a plurality of photosensors in 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 are popularized. 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 sense an image that appears when a finger or the like approaches the screen is known. In the method of image detection, 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 may not be detected correctly. Therefore, for a display device including a backlight, there is also known a method of using an optical sensor to sense a reflected image ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/20G06F3/041G09G3/36
CPCG09G3/3648G06F3/041G06F3/0421G09G3/3688G09G2320/0233G09G3/3614G09G2360/148G06F3/04184
Inventor 植畑正树久保田章敬藤冈章纯后藤利充
Owner SHARP KK