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Display unit with touch detection function and electronic unit

a display unit and touch detection technology, applied in the field of display units having touch detection functions, can solve the problems of degradation in the s/n ratio of degradation of the accuracy of touch position or the like, etc., and achieve the effect of suppressing the change in the touch detection signal, suppressing the influence of display operation on touch detection, and suppressing the influence of display operation

Inactive Publication Date: 2012-03-29
JAPAN DISPLAY INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013]In the display unit with touch detection function and the electronic unit according to the embodiments of the disclosure, since the voltage of the pixel signal line is maintained at a certain level in the touch detection period, touch detection may be performed while suppressing influence of display operation.
[0014]It is to be understood that both the foregoing general description and the following detailed description are exemplary, and are intended to provide further explanation of the technology as claimed.

Problems solved by technology

This may cause degradation in S / N ratio of the touch detection signal, leading to degradation in accuracy of touch position or the like.

Method used

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  • Display unit with touch detection function and electronic unit
  • Display unit with touch detection function and electronic unit
  • Display unit with touch detection function and electronic unit

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

2. First Embodiment

[Configuration Example]

(General Configuration Example)

[0054]FIG. 4 illustrates a configuration example of a display unit with a touch detection function according to a first embodiment of the disclosure. The display unit uses a liquid crystal display element as a display element, and is a so-called in-cell type unit, in which a liquid crystal display device configured by the liquid crystal display element is integrated with a capacitance-type touch detection device.

[0055]The display unit with a touch detection function 1 includes a control section 11, a gate driver 12, a source driver 13, a selection switch section 14, a drive signal generation section 15, a drive electrode driver 16, a display device with a touch detection function 10, and a touch detection section 40.

[0056]The control section 11 is a circuit supplying a control signal to each of the gate driver 12, the source driver 13, the drive signal generation section 15, the drive electrode driver 16, and t...

modification 1

[Modification 1]

[0121]While the source driver 13 applies the pixel signals Vpix to the pixel signal lines SGL via the selection switch section 14 in the embodiment, this is not limitative. Instead, for example, the source driver 13 may directly apply the pixel signals Vpix to the pixel signal lines SGL after generating the signals. In other words, while each pixel signal line SGL is made to be in a floating state to maintain the voltage of the pixel signal line SGL during the touch detection period in the embodiment, this is not limitative. Instead, for example, a voltage may be directly applied to each pixel signal line SGL to maintain the voltage of the pixel signal line SGL during the touch detection period.

second embodiment

3. Second Embodiment

[0122]Next, a display unit with a touch detection function 7 according to a second embodiment of the disclosure is described. In the embodiment, a predetermined voltage is applied to each pixel signal line SGL during a touch detection period Pt. It is to be noted that substantially the same components as those of the display unit with a touch detection function 1 according to the above-described first embodiment are designated by the same numerals, and description of them is appropriately omitted.

[0123]The display unit with a touch detection function 7 includes a source driver 13A and a detection timing control section 46A as illustrated in FIG. 4.

[0124]The source driver 13A generates a pixel signal Vsig including a predetermined voltage Vp (described later), and generates a switch control signal Vsel necessary for demultiplexing pixel signals Vpix multiplexed into the pixel signal Vsig and separating the predetermined voltage Vp, and supplies the switch control ...

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PUM

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Abstract

A display unit with touch detection function includes a plurality of pixel signal lines each transmitting a pixel signal for display; a pixel signal line drive section applying the pixel signal to each of the pixel signal lines; display elements each performing display based on the pixel signal; touch detection electrodes each outputting a detection signal based on a change in capacitance occurring due to an external proximity object; and a touch detection section detecting, in a touch detection period, a touch event based on the detection signal, the touch detection period being different from a display period for the display elements to perform display operation. The pixel signal line drive section maintains a voltage of each of the pixel signal lines at a certain level during the touch detection period.

Description

BACKGROUND[0001]The present disclosure relates to a display unit having touch detection function, and particularly relates to a display unit with touch detection function of detecting a touch event based on a change in capacitance due to an external proximity object, and an electronic unit having such the display unit with a touch detection function.[0002]Recently, a display unit has been notified, where a touch detection device, a so-called touch panel, is mounted on a display device such as liquid crystal display device, or the touch panel is integrated with the display device, and various button images or the like are displayed on the display device instead of common mechanical buttons, enabling information input. Such a display unit having the touch panel needs no input device such as a keyboard, a mouse, and a keypad and therefore tends to be expansively used not only for computers but also for handheld information terminals such as a mobile phone.[0003]A type of the touch dete...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G06F3/044
CPCG06F3/044G02F1/13338G06F3/0445G06F3/0446G06F3/0354G06F3/0416G09G3/36G09G3/3611G09G3/3648G09G3/3674G09G2310/0278G09G2310/065G09G2320/0219G09G3/3685
Inventor KIDA, YOSHITOSHIAZUMI, KOHEINOGUCHI, KOJIISHIZAKI, KOJI
Owner JAPAN DISPLAY INC
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