Touch Screen Driver Timing Adjustment for Burn-In Prevention
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Solution Overview
Problem
Touch screens, particularly those with amorphous silicon technology, suffer from burn-in or image sticking issues due to fixed timing synchronization between touch drivers and active styluses, leading to potential permanent damage and reduced reliability.
Innovation Solution
A position input system where the touch screen driver transmits an uplink signal with timing information to the active stylus, allowing it to adjust the timing of subsequent touch periods, thereby avoiding consistent synchronization and reducing burn-in risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed timing synchronization is used between touch driver and active stylus, then communication reliability is improved, but burn-in damage occurs due to consistent pixel activation patterns
Solution Approach 1:
The patent applies dynamics by making the touch period timing variable rather than fixed. The touch driver dynamically adjusts the timing of touch periods based on received timing information from the active stylus, changing the activation patterns of pixel columns over time. This dynamic timing adjustment maintains communication reliability while preventing burn-in damage by avoiding consistent pixel activation patterns.
Solution Approach 2:
The patent changes the timing parameter of touch periods. The driver receives timing information indicating when next touch periods will occur, and adjusts subsequent touch period timings accordingly. This parameter change transforms the fixed timing pattern into a variable timing pattern, resolving the contradiction between maintaining reliable communication and preventing burn-in damage.
2Reliability
If timing of touch periods is varied to prevent burn-in, then reliability is improved, but synchronization complexity increases
Solution Approach 1:
The patent implements feedback mechanisms where the active stylus transmits timing information to the touch driver about when next touch periods will occur. The driver uses this feedback to adjust subsequent touch period timings. This feedback loop enables automatic synchronization adaptation, improving reliability while managing complexity through automated timing adjustment rather than manual configuration.
Solution Approach 2:
The system performs self-service by automatically adjusting its own timing based on information exchanged with the active stylus. The touch driver autonomously modifies touch period timings to prevent burn-in while maintaining synchronization, without requiring external intervention or complex control systems. This self-adjusting capability improves reliability while keeping the system relatively simple.
Data Source
AI summary
A position input system includes a touch screen, an active stylus and a driver. The driver transmits an uplink signal to the active stylus via the touch screen in a current touch period, the uplink signal containing timing information that informs the active stylus of timing of a next touch period in which the active stylus transmits a downlink signal to the driver via the touch screen. In another embodiment, the driver transmits an uplink signal to the active stylus via the touch screen in a current touch period of a current frame at a time different from a corresponding touch period of a previous frame.