Display Panel Touch Electrode Voltage Control Against Electrostatic Breakdown
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Solution Overview
Problem
Current OLED display panels face issues with electrostatic breakdown between scanned and non-scanned touch electrodes due to significant voltage differences, leading to touch recognition failures.
Innovation Solution
The display panel design includes a touch unit structure where adjacent touch units are provided with different voltages, with the currently scanned unit receiving a touch driving voltage and its neighbors receiving a first voltage less than the driving voltage, reducing the voltage difference and stabilizing the environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a touch driving voltage is applied to the currently scanned touch unit, then touch recognition sensitivity is improved, but the voltage difference between scanned and non-scanned touch electrodes increases, causing electrostatic breakdown
Solution Approach 1:
The patent applies different voltage levels to different spatial regions of touch electrodes. Specifically, the currently scanned touch unit receives the full touch driving voltage (first voltage level) for optimal touch recognition, while adjacent touch units receive a reduced voltage (second voltage level) and non-adjacent units receive an even lower voltage (third voltage level). This local quality differentiation maintains high touch sensitivity at the scanned position while progressively reducing electrostatic stress in surrounding areas, preventing electrostatic breakdown.
Solution Approach 2:
The patent dynamically changes the voltage parameter applied to touch electrodes based on their spatial relationship to the currently scanned touch unit. The driving circuit adjusts voltage levels in three distinct stages: full driving voltage for the active scanned unit, reduced voltage for adjacent units, and minimal voltage for non-adjacent units. This parameter modification allows the system to optimize touch recognition performance while controlling electrostatic stress through voltage level adaptation.
2Stress or pressure
If a high touch driving voltage is applied to all touch units, then touch electrode signal strength is improved, but the voltage difference between adjacent touch units increases, leading to touch recognition failures
Solution Approach 1:
The patent implements spatially differentiated voltage control where only the currently scanned touch unit receives the full touch driving voltage, while adjacent and non-adjacent units receive progressively reduced voltages. This local quality approach ensures that strong signal strength is concentrated at the active scanning position where it is most needed for touch detection, while reducing voltage in other areas prevents interference and recognition failures caused by excessive voltage differences between adjacent electrodes.
Data Source
AI summary
The present application discloses a display panel, a method for driving a display panel, a driving time sequence, and a display apparatus. The display panel includes: a plurality of touch units each including a plurality of touch electrodes arranged along a first direction, here, the plurality of touch units are arranged along a second direction, and the first direction intersects the second direction; and a light-emitting device including a first electrode reused as the touch electrode; here, under a condition that an i-th touch unit is provided with a touch driving voltage, at least one touch unit adjacent to the i-th touch unit is provided with a first voltage, and i is a positive integer; and the first voltage is less than the touch driving voltage. According to the embodiments of the present application, the performance of the display product can be improved.