Optical sensor, semiconductor device, and liquid crystal panel

A light sensor and semiconductor technology, applied in the field of light sensors, can solve the problems of not being able to detect changes in light

Inactive Publication Date: 2012-05-23
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, there is a problem that the useful light sensor cannot detect the change of the light

Method used

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  • Optical sensor, semiconductor device, and liquid crystal panel
  • Optical sensor, semiconductor device, and liquid crystal panel
  • Optical sensor, semiconductor device, and liquid crystal panel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0044] figure 1 is a cross-sectional view showing a schematic configuration of the semiconductor device 100 according to Embodiment 1 of the present invention. The semiconductor device 100 includes: a substrate 101, a thin film diode 130 formed on the substrate 101 with a base layer 103 as an insulating layer interposed therebetween, a light sensor 132 having a light shielding layer 160 provided between the substrate 101 and the thin film diode 130, and a thin film Transistor 150. The substrate 101 is preferably light-transmitting. exist figure 1 In order to simplify the drawing, only a single photosensor 132 and a single thin film transistor 150 are shown, but a plurality of photosensors 132 and a plurality of thin film transistors 150 can be formed on a common substrate 101 . In addition, in figure 1 In the figure, for easy understanding, a cross-sectional view of the photosensor 132 and a cross-sectional view of the thin film transistor 150 are shown in the same draw...

Embodiment approach 2

[0081] In Embodiment 2, a liquid crystal panel including a semiconductor device having the photodetection function described in Embodiment 1 will be described.

[0082] Figure 4 It is a cross-sectional view showing a schematic configuration of a liquid crystal display device 500 including a liquid crystal panel 501 according to the second embodiment.

[0083] The liquid crystal display device 500 includes: a liquid crystal panel 501 ; an illuminating device 502 for illuminating the backside of the liquid crystal panel 501 ;

[0084] The liquid crystal panel 501 includes: a TFT array substrate 510 and an opposing substrate 520 , both of which are light-transmitting plate-like members; and a liquid crystal layer 519 sealed between the TFT array substrate 510 and the opposing substrate 520 . Materials for forming the TFT array substrate 510 and the counter substrate 520 are not particularly limited. For example, the same materials as those used in conventional liquid crystal p...

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Abstract

Disclosed are an optical sensor, a semiconductor device, and a liquid crystal panel wherein a thin-film diode has improved optical detection sensitivity and a semiconductor layer thereof has improved light-use efficiency, even if the semiconductor layer is thin. One side of a substrate (101) is provided with a thin-film diode (130) having a first semiconductor layer (131) containing an n-type region (131n) and a p-type region (131p), at least. A light-blocking layer (160) is provided between the substrate and the first semiconductor layer. Surface asperities are formed on the side of the light-blocking layer that faces the first semiconductor layer, and the first semiconductor layer has a texture that matches the surface asperities of the light-blocking layer. Light incident on the light-blocking layer is diffusely reflected into the first semiconductor layer. Since the first semiconductor layer has a texture that matches the surface asperities of the light-blocking layer, the distance the diffusely-reflected light travels in the first semiconductor layer is increased. As a result, the amount of light absorbed by the first semiconductor layer increases and the optical detection sensitivity improves.

Description

technical field [0001] The present invention relates to an optical sensor including a thin film diode (TFD) having a semiconductor layer including at least an n-type region and a p-type region. In addition, the present invention also relates to a semiconductor device including a thin film diode and a thin film transistor (Thin Film Transistor: TFT). Furthermore, the present invention also relates to a liquid crystal panel including the semiconductor device. Background technique [0002] A touch sensor function can be realized by installing a light sensor including a thin film diode in a display device. In such a display device, touching the observer-side surface (that is, the display surface) of the display device with a finger or a stylus changes the incident light from the display surface side, and the incident light is detected by an optical sensor. Changes to enable information input. [0003] In such a display device, there is little change in light caused by touchin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/10G02F1/1333G02F1/1335G02F1/136G09F9/30H01L27/14H01L29/786
CPCG02F1/13338G06F2203/04103G06F3/0421H01L27/14678H01L31/0236H01L31/105H01L31/02164H01L27/1214Y02E10/50H01L27/14692G06F3/0412H01L31/02363
Inventor 织田明博中泽淳
Owner SHARP KK
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