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Touch detection device, display device having touch detection function, electronic unit, and touch detection circuit

A touch detection and detection electrode technology, applied in electrical digital data processing, data processing input/output process, instruments, etc., can solve the problems of signal-to-noise ratio drop, detection sensitivity drop, influence, etc. Effects of noise components

Inactive Publication Date: 2011-11-09
JAPAN DISPLAY INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in principle, electrostatic capacitive touch panels are susceptible to noise (hereinafter, referred to as "external noise") caused by inverter fluorescent lamps, AM (amplitude modulation) waves, AC (alternating current) power sources, or other noise sources Impact
Specifically, since the signal-to-noise ratio (S / R) decreases compared to the case of detecting the contact state of an external proximate object, the detection sensitivity may decrease when detecting the proximate state or "approach" of an external proximate object

Method used

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  • Touch detection device, display device having touch detection function, electronic unit, and touch detection circuit
  • Touch detection device, display device having touch detection function, electronic unit, and touch detection circuit
  • Touch detection device, display device having touch detection function, electronic unit, and touch detection circuit

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no. 2 approach

[0046] 4. Application example

[0047] [1. Basic principle of capacitive touch detection]

[0048] First, refer to Figure 1 to Figure 3 The basic principle of touch detection in the display device with a touch detection function according to the embodiment will be described. This touch detection method is embodied by an electrostatic capacitive touch sensor. For example, if figure 1 As shown in (A), a pair of electrodes (a drive electrode E1 and a touch detection electrode E2 ) are used to constitute a capacitor element C1 , and the pair of electrodes are provided facing each other with a dielectric D interposed therebetween. This construct can be expressed as figure 1 Equivalent circuit shown in (B). The capacitor element C1 is composed of a drive electrode E1, a detection electrode E2, and a dielectric D. The capacitor element C1 has a first terminal S connected to an AC signal source (drive signal source) and a second terminal P grounded through a resistor R and conn...

Embodiment approach

[0113] According to the first embodiment, reference data is acquired from one of the plurality of touch detection electrodes. Therefore, electrodes for detecting external noise are eliminated, so that the configuration of the touch detection unit 30 can be simplified. Furthermore, it is desirable to simply subtract the reference data DR from the touch detection data DT when subtracting the external noise component. Thus, the configuration of the touch detection circuit 40 can be simplified.

[0114] Furthermore, according to this embodiment, a touch detection electrode used for acquiring reference data is selected from a plurality of touch detection electrodes. Therefore, it is possible to accurately reduce the external noise component regardless of the position of the external approaching object.

[0115] Furthermore, according to this embodiment, the average value calculation section obtains the average value of the touch detection data DT of the respective touch detection...

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Abstract

The invention discloses a touch detection device, a display device having the touch detection function, an electronic unit, and a touch detection circuit. The touch detection device includes: a plurality of drive electrodes; a plurality of detection electrodes intersecting the plurality of drive electrodes, and each outputting, in response to driving of each of the drive electrodes, a series of detection signals; a signal correction section determining a reference based on the detection signals, and subtracting the determined reference from each of the detection signals; and a detecting section detecting an external proximity object based on corrected detection signals provided from the signal correction section.

Description

technical field [0001] The present invention relates to a touch detection device for detecting an external approaching object such as a finger, a display device with a touch detection function, an electronic unit, and a touch detection circuit for these devices. Background technique [0002] In recent years, attention has been paid to a display device in which a touch detection device (generally called a touch panel) is mounted on a display such as a liquid crystal display or a touch panel and a display are integrated, and the display device can make the display Various button images and the like are displayed, thereby making it possible to input information instead of setting commonly used mechanical buttons. A display device provided with a touch panel eliminates the necessity of providing an input device such as a keyboard, a mouse, and a keypad, so it is increasingly used not only for computers but also for portable handheld terminals such as cellular phones . [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/041
CPCG06F3/044G06F3/0412G06F3/0418G06F3/0445G06F3/04184G06F2203/04111
Inventor 野口幸治木田芳利
Owner JAPAN DISPLAY INC
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