Touch Panel Timing Shift for Less Visible Horizontal Stripes
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Solution Overview
Problem
In-cell touch panels experience horizontal stripes due to brightness differences when switching between display and touch stages, affecting user experience, especially in low to medium grayscales.
Innovation Solution
The method involves altering the switching positions between display and touch stages by changing the timing sequences for different image frames, utilizing the exchange of time and space to disrupt the occurrence of horizontal stripes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the touch panel uses horizontal synchronous scanning mode with fixed switching positions between display and touch stages, then the touch reporting rate and display refresh rate requirements are met, but horizontal stripes appear due to brightness differences at switching positions
Solution Approach 1:
The patent applies dynamics by making the switching positions between display and touch stages variable rather than fixed. The timing controller dynamically adjusts the switching positions in different image frames, causing the horizontal stripes to appear at different locations and reducing their overall identifiability. This resolves the contradiction by maintaining high touch reporting rates while mitigating the visual impact of brightness differences through dynamic position variation.
Solution Approach 2:
The patent implements periodic action by alternating between different timing sequences for different image frames. The timing controller periodically switches between multiple timing sequences, each with different switching positions, creating a periodic pattern that distributes the horizontal stripe artifacts across different spatial locations over time. This periodic variation reduces the perceived severity of the horizontal stripes while maintaining consistent touch reporting performance.
2Object-affected harmful factors
If the switching positions between display and touch stages are changed to reduce horizontal stripe identifiability, then user experience improves, but the timing sequence complexity increases
Solution Approach 1:
The patent applies asymmetry by using different timing sequences with asymmetric switching positions relative to each other. Instead of using symmetric or identical timing sequences, the system employs asymmetric variations in switching positions that effectively distribute horizontal stripe artifacts. This asymmetric approach reduces horizontal stripe identifiability while the timing controller manages the complexity through systematic selection from a limited set of predefined timing sequences.
Data Source
AI summary
The disclosure provides a driving method for a touch panel, a driving device, and a display device. The method includes: controlling the touch panel to scan and display a first image frame according to a first timing sequence including first display stages and first touch stages alternately performed in time-sharing, in which a first switching position is defined between each of the first display stages and each of the first touch stages; determining a second timing sequence according to the first timing sequence, in which the second timing sequence includes second display stages and second touch stages alternately performed in time-sharing, and a second switching position different from the first switching position is defined between each of the second display stages and each of the second touch stages; controlling the touch panel to scan and display a second image frame according to the second timing sequence.