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Display device fitted with position input function

A display device and functional technology, applied in the input/output process of data processing, static indicators, optics, etc., can solve the problems of reduced sensitivity of position detection, susceptibility to interference, low degree of freedom of touch detection time, etc., to provide position The effect of detection sensitivity

Inactive Publication Date: 2017-08-01
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, its touch detection timing has a low degree of freedom and is easily disturbed, thereby leading to a risk of decreased position detection sensitivity
Especially when the unit drive period is shortened with the promotion of high-definition, the position detection sensitivity may be further reduced because the touch detection period is also shortened.
In addition, if the size of the display panel is increased, the period required for the touch detection will become longer, so the countermeasures have been troubled.

Method used

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no. 1 approach

[0043] according to Figure 1 to Figure 14 The first embodiment of the present invention will be described. In this embodiment, a liquid crystal display device having a position input function (display device having a position input function) 10 will be described as an example. In addition, X-axis, Y-axis, and Z-axis are shown in the partial drawings, and the directions of the respective axes are drawn to coincide with the directions shown in the respective drawings. In addition, regarding the up and down direction is figure 2 etc., and the upper side in the figure is taken as the surface, and the lower side in the figure is taken as the reverse side.

[0044] Such as figure 1 and figure 2 As shown, the liquid crystal display device 10 has: a liquid crystal panel (display panel with a position input function) 11, the liquid crystal panel shown displays an image, and based on the displayed image, the position information input by the user can be detected; a backlight devi...

no. 2 approach

[0086] according to Figure 15 A second embodiment of the present invention will be described. In this second embodiment, the time of the position detection period is changed. In addition, the description of the same structure, operation, and effect as those of the above-mentioned first embodiment will not be repeated.

[0087] like Figure 15 As shown, the main control unit according to the present embodiment controls the touch controller so that the drive electrode is driven by supplying the drive signal Vdri across the scan writing period and the stop period included in the display period, and detects During the stop period, the position detection signal Vdet output by the detection electrode is detected. That is, the position detection period (time pt5 to time pt6, time pt7 to time pt8) is performed so as to straddle the scan writing period and the stop period. During the stop period included in the display period, since the TFT drive is stopped, noise is less likely t...

no. 3 approach

[0091] according to Figure 16 A third embodiment of the present invention will be described. In this third embodiment, the number of position detection periods corresponding to one scan writing period in the first embodiment is changed. In addition, the description of the same structure, operation, and effect as those of the above-mentioned first embodiment will not be repeated.

[0092] like Figure 16 As shown, the main control unit according to this embodiment controls the touch controller so that the drive electrodes are driven by supplying the drive signal Vdri to the drive electrodes twice in the scan writing period included in the display period. That is, the position detection periods (time pt9 to time pt10, time pt11 to time pt12, time pt13 to time pt14, time pt115 to time pt16) are included twice in each scanning write period. Thereby, the position detection result can be statistically analyzed, and the deterioration of the position detection sensitivity due to t...

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Abstract

A liquid crystal display device 10 is provided with a TFT 19, a pixel electrode 20, a common electrode 23, an array substrate 11b, a CF substrate 11a, a detection electrode 38 provided on the CF substrate 11a, a drive electrode 39 provided on the CF substrate 11a, a driver 16 and a row control circuit unit 37b which are display drive units for supplying a scan signal Vscan and a data signal Vpix to the TFT 19 and driving the display, and a touch controller 48 for performing position detection control by supplying a drive signal Vdri to the drive electrode 39 and detecting a position detection signal Vdet outputted from the detection electrode 38, the touch controller 48 supplying the drive signal Vdri to the drive electrode 39 and driving the drive electrode 39 in at least a scanning write period in which the scan signal Vscan is supplied to the TFT 19 by the row control circuit unit 37b that is the display drive unit and the TFT 19 is driven.

Description

technical field [0001] The invention relates to a display device with position input function. Background technique [0002] In recent years, electronic devices such as tablet-type notebook computers and portable information terminals have been increasingly equipped with touch panels in order to improve operability and practicality. The touch panel can input positional information on the display surface of the display panel by, for example, touching with a finger or a stylus. Thereby, the user can perform an intuitive operation such as directly touching an image displayed on the display panel. The following patent document 1 is known as an example of a display panel equipped with such a touch panel position input function. [0003] Patent Document 1 describes a display device that includes a display element and a touch detection element, and drives the display element to sequentially display M parallel lines in a plurality of unit drive periods each constituting one frame ...

Claims

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Application Information

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IPC IPC(8): G06F3/041G02F1/133G02F1/1333G02F1/1368G06F3/044
CPCG09G3/20G02F1/133707G06F3/0412G02F1/13338G09G2300/0426G09G2310/08G06F3/0446G06F3/04164G06F3/0445G06F3/04184G02F1/1368G02F1/134336G02F2201/121G02F2201/123G09G3/3677G09G3/3688
Inventor 木田和寿多田宪史杉田靖博小川裕之丸山武纪
Owner SHARP KK
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