Input device and liquid crystal display device

An input device and touch detection technology, applied in the input/output process of data processing, static indicators, cathode ray tube indicators, etc., can solve the problems of resistance film degradation or damage, reduce power consumption, and improve detection accuracy , The effect of improving the input accuracy

Inactive Publication Date: 2015-02-25
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in the resistive film method, the touch position is detected by mechanical contact of the resistive film, so the resistive film may be degraded or damaged. In contrast, in the capacitive coupling method, the detection electrode does not come into contact with other electrodes, etc. Such mechanical contact is also advantageous in terms of durability

Method used

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  • Input device and liquid crystal display device
  • Input device and liquid crystal display device
  • Input device and liquid crystal display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0034]Hereinafter, as an example of an input device according to an embodiment of the present technology, a touch sensor used in a liquid crystal display device including a liquid crystal panel as a display panel will be described with reference to the drawings. In addition, this embodiment is only an example, and this technology is not limited to the structure shown in this embodiment.

[0035] figure 1 It is a block diagram for explaining the overall configuration of a liquid crystal display device having a touch sensor function according to an embodiment of the present technology.

[0036] Such as figure 1 As shown, the liquid crystal display device includes a liquid crystal panel 1, a backlight (backlight) unit 2, a scanning line driving circuit 3, an image line driving circuit 4, a backlight driving circuit 5, a sensor driving circuit 6, a signal detection circuit 7 and a control device 8 .

[0037] The liquid crystal panel 1 is in the shape of a rectangular flat plate...

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PUM

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Abstract

An object of the present technology is to improve the detection accuracy of a capacitance coupling type input device at a time of touch operation. An input device includes: a plurality of driving electrodes and a plurality of detection electrodes crossing each other; and capacitive elements formed in respective crossed portions between the driving electrodes and the detection electrodes. During a touch detection period, a driving signal is applied to the driving electrodes on a line block basis of the scanning signal lines, and touch is detected based on a detection signal output from each of the detection electrodes, the touch detection period is provided in a display update period in a horizontal scanning period of the display apparatus, and during a horizontal scanning period following a certain horizontal scanning period during which touch detection has been performed, a driving signal whose potential is has been changed to a direction opposite to that of the previous horizontal scanning period is applied to the driving electrodes to start touch detection.

Description

technical field [0001] The present invention relates to a capacitive coupling type input device for inputting coordinates on a screen, and a liquid crystal display device including the input device and a liquid crystal panel as a display element. Background technique [0002] A display device equipped with an input device with a screen input function for inputting information by touching the display screen with the user's finger or the like is used in mobile electronic devices such as PDAs and portable terminals, various home appliances, unmanned reception Machines and other placement type customer guidance terminals, etc. As such an input device based on a touch operation, various methods such as the following are known: a resistive film method that detects a change in the resistance value of a touched part, or an electrostatic capacitive coupling method that detects a change in capacitance, On the other hand, it is a light sensor method that detects changes in the amount ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/041G06F3/044
CPCG09G3/3685G09G5/18G06F3/044G06F3/0412G09G3/3648G09G2354/00G06F3/0446
Inventor 高木一树井上学小杉直贵中山贵仁渡海章笠原滋雄加道博行
Owner PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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