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Voltage supply circuit, method, touch display device and voltage supply method thereof

A voltage and circuit technology, applied in the field of touch display, can solve the problems of aggravating touch (touch) stripes and sub-pixel display effects, etc.

Active Publication Date: 2020-06-05
BOE TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main purpose of the present invention is to provide a voltage supply circuit, a method, a touch display device and a voltage supply method thereof, which solve the problem that the voltage on the common electrode block cannot drop rapidly when switching from the touch stage to the display period in the prior art. To the standard common electrode voltage, which will affect the display of the first few rows of sub-pixels after the touch scan is completed, thus aggravating the phenomenon of fixed-position Touch (touch) stripes in the LHB touch scan mode

Method used

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  • Voltage supply circuit, method, touch display device and voltage supply method thereof

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Embodiment approach

[0073] According to a specific implementation manner, the touch scanning voltage is greater than the standard common electrode voltage, the initial common electrode voltage is less than the standard common electrode voltage, and the predetermined voltage difference range is less than 0; or,

[0074] According to another specific implementation manner, the touch scanning voltage is less than the standard common electrode voltage, the initial common electrode voltage is greater than the standard common electrode voltage, and the predetermined voltage difference range is greater than 0.

[0075] In the embodiment of the present invention, the common electrode block is multiplexed as a touch electrode block, and in the touch stage, the voltage supply sub-circuit 11 performs touch scan.

[0076] In actual operation, when the touch scanning voltage is greater than the standard common electrode voltage, it is necessary to set the initial common electrode voltage to be smaller than the...

specific Embodiment approach

[0110] According to a specific implementation manner, the comparison subcircuit may include a comparator;

[0111] When the touch scanning voltage is greater than the standard common electrode voltage, the initial common electrode voltage is less than the standard common electrode voltage, and the predetermined voltage difference range is less than 0, the first input terminal of the comparator (The first input terminal may be a non-inverting input terminal) is connected to the feedback voltage line, and the second input terminal of the comparator (the second input terminal may be an inverting input terminal) is connected to the second power supply voltage The output terminal D2 is connected, the output terminal of the comparator is connected to the feedback control signal providing module, and the comparator is used to provide feedback control signal to the feedback control signal when the feedback voltage VCOM_FB is less than the standard common electrode voltage VCOM. The si...

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Abstract

The invention provides a voltage supply circuit, a method, a touch display device and a voltage supply method thereof. The voltage supply circuit includes a voltage supply subcircuit, a voltage feedback subcircuit, a comparison subcircuit and a plurality of signal lines; the voltage supply subcircuit provides an initial common electrode voltage for the common electrode block through the signal line during the initial stage included in the display period; The voltage feedback sub-circuit collects the feedback voltage output by the signal line in the initial stage; the comparison sub-circuit compares the feedback voltage and the standard common electrode voltage; after the voltage supply sub-circuit receives the normal output control signal, in the normal output phase included in the display time period, The control provides standard common electrode voltage to the common electrode block through the signal line. The present invention can reduce the time for the voltage provided for the common electrode block to reach the standard common electrode voltage after entering the display time period, and can improve the phenomenon of Touch (touch) stripes.

Description

technical field [0001] The present invention relates to the technical field of touch display, in particular to a voltage supply circuit, a method, a touch display device and a voltage supply method thereof. Background technique [0002] In the prior art, a method for improving the touch (touch) reporting rate is to insert the touch scan voltage in segments during the display of one frame (that is, the LHB touch scan mode). However, in the current design, the common electrode block is reused as the touch electrode block, and the common electrode voltage needs to be applied to the common electrode block during the non-touch scanning period, and the touch signal on the common electrode block is converted into the common electrode voltage Due to the effect of capacitance during the signal, there will be RC (resistance-capacitance) delay phenomenon, so that when switching from the touch stage to the display period, the voltage on the common electrode block cannot quickly drop to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/041
CPCG06F3/0412G06F3/0416G06F3/0446G06F3/0443G06F3/04164G06F3/04166
Inventor 田振国胡双陈帅梁雪波陈宏唐秀珠李川赵雅楠
Owner BOE TECH GRP CO LTD