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Systems and methods for using tft-based LCD panels as capacitive touch sensors

A technology for screens and conductive areas, applied in static indicators, data processing input/output processes, instruments, etc., can solve problems such as pixel darkening

Inactive Publication Date: 2011-01-12
NUVOTON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with this scheme is that all pixels in the same row will see a portion of the applied voltage, as will all pixels in the same column, so the pixels tend to go dark even though they are not fully switched

Method used

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  • Systems and methods for using tft-based LCD panels as capacitive touch sensors
  • Systems and methods for using tft-based LCD panels as capacitive touch sensors
  • Systems and methods for using tft-based LCD panels as capacitive touch sensors

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Embodiment Construction

[0124] According to the embodiments of the present invention, the thin film transistor panel of the liquid crystal display can be used as a capacitive touch sensor. The thin film transistor panel of a general liquid crystal display and its manufacturing method are common knowledge in the field. The advantage of the embodiment of the present invention is that: use the existing liquid crystal display panel or such as Figure 1A , figure 2 The improved structure shown can not only display images but also serve as an input device at the same time, so as to reduce the cost. In application, it can be used as a touch screen for portable computers, desktop computers, information kiosks, vending machines and handheld devices, such as personal digital assistants, smart phones, portable phones, etc. Or widely used in related technical links. So far, these devices are nothing more than adding at least one touch screen on the top or bottom of the liquid crystal display, resulting in high...

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Abstract

A display screen system operative in the presence of backlight, which may be provided by a rear light source or by a mirror according to reflective LCD technologies, to identify presence of a conductive member such as a finger, the system comprising a structural, transparent planar element including an array of structural, planar conductive areas independently electrically addressable by a sourceof electric power, each conductive area having a plurality of transparency states controlled by said source of electric power; and capacitance sensing circuitry operative to sense capacitance of at least one of said conductive areas.

Description

technical field [0001] The present invention relates to a capacitive touch sensor, and in particular to a capacitive touch sensor for a thin film transistor liquid crystal display panel. Background technique [0002] According to Wikipedia, a touch screen is a display device capable of detecting the presence and position of a touch falling on the display area. Generally, the term refers to touching or contacting the display of a device, such as with a finger. A capacitive touch panel is a sensor made of glass coated with a transparent conductive material such as indium tin oxide (ITO). This type of sensor is usually a capacitor in which the plates are the vertical areas between the horizontal and vertical axes in a grid pattern. Since the human body is conductive, touching the surface of the sensor affects its electric field, thereby causing a detectable change in the capacitance of the device. These sensors sense changes in capacitance in the vicinity and can be triggere...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/044G02F1/133
CPCG06F3/0418G06F3/0416G06F3/044G06F3/04166
Inventor 尼尔·泰沙尔
Owner NUVOTON