Active matrix display apparatus with touch sensing function

Abstract

An active matrix display apparatus with touch sensing function having high aperture ratio includes a plurality of pixels, having respective pixels arrayed as a matrix, positioned at intersections of source lines of respective columns and gate lines of respective rows, each pixel having a thin film transistor and a liquid crystal element, which is positioned between a drain of thin film transistors and a common line; and a touch switch unit having touch sensing transistors and a mechanical switch, which is positioned between two adjacent pixels in an identical column. The gates of the touch sensing transistors are coupled to the gate lines of the two adjacent pixels wherein the touch sensing transistors coupled in series and the mechanical switch shared by the adjacent pixels, are coupled between the source line of the identical column and the common line.

Description

technical field [0001] The invention relates to an active matrix display device, in particular to a display device with a touch function. Background technique [0002] In the current liquid crystal display device, etc., the necessary information is given by various methods such as touching the screen with a finger or a thin rod called a stylus to detect changes in capacitance or resistance, or by detecting infrared reflections, etc. Enter and operate instructions. [0003] Among them, the pressure-sensitive (mechanical) touch, which uses resistance that changes with pressure, will paste a pressure-sensitive film on the glass substrate on the surface of the display device, but the optical properties such as transparency of the film must be poor, so there is a risk of degrading the display. The problem of fineness and narrowing of viewing angle. [0004] The capacitive sensing method is weaker than noise, while the optical sensing method has the problem of misoperation cause...

AI Technical Summary

Problems solved by technology

[0013] In addition, if the switch is defective, not only the touch cannot be touched, but also the display will cause problems

[0014] In addition, it is necessary to install a mechanical switch in each pixel. Since the switch needs to occupy a certain area, the effective display area is reduced and the aperture ratio is low.

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