Liquid crystal display device

Abstract

A liquid crystal panel (20) provided in a liquid crystal display device of the present invention includes a plurality of optical sensor elements (30) each for detecting an intensity of light received, and has an area sensor function to detect an external input position by causing each of the optical sensor elements (30) to detect an image on the panel surface. The liquid crystal panel (20) includes the optical sensor elements (30) constituting an area sensor and a temperature compensating sensor (50) for carrying out temperature compensation of each of these optical sensor elements (30). The temperature compensating sensor (50) includes a lower-layer light blocking film, optical sensor elements (30A) each for detecting a temperature of an environment where the liquid crystal display device is placed which optical sensor elements (30A) are provided on the lower-layer light blocking film, and an upper-layer light blocking film which is provided so as to cover the optical sensor elements for detecting a temperature which upper-layer light blocking film blocks ultraviolet light, visible light, and infrared light. This makes it possible to attain a liquid crystal display device including an area sensor that does not receive an influence of a temperature of an environment where the liquid crystal display device is used and accordingly has a high detection precision.

Description

technical field [0001] The present invention relates to a liquid crystal display device with a built-in light sensor element and an area sensing function for detecting a position input from the outside. Background technique [0002] Among display devices such as liquid crystal display devices, touch-panel-integrated display devices having a touch-panel (area sensor) function capable of detecting the touched position when the surface of the panel is touched with an input pen or a human finger have been developed. . [0003] In the existing touch panel integrated display device, the resistive film method (the method of detecting the input position by contacting the upper conductive substrate and the lower conductive substrate when pressing), the electrostatic capacitance method (the method of detecting the capacitance of the touched part Changes to detect the input position) become mainstream. [0004] However, in recent years, the development of liquid crystal display devic...

AI Technical Summary

Problems solved by technology

In this way, as the ambient temperature rises, the current value flowing to the above-mentioned light sensing element also increases, so it becomes difficult to purely derive the current value corresponding to the light-receiving amount only.

Images