Display Gate Driver Interlaced Scanning for Touch Sensing
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Solution Overview
Problem
Existing display devices face challenges in sensing touch inputs without degrading display quality, particularly when the sensing period of the sensor unit is shorter than the image refresh period of the display unit.
Innovation Solution
A display device is designed with a gate driver that operates in two modes: progressive scanning in the first mode and interlaced scanning in the second mode. In the second mode, the sensor unit operates during allocated periods between interlaced scanning operations, allowing for touch input sensing without interfering with the display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the sensing period of the sensor unit is shortened to enable real-time touch input sensing, then touch input response speed is improved, but interference occurs in the image and display quality is degraded
Solution Approach 1:
The gate lines are divided into first gate lines and second gate lines, which are alternately arranged. The gate driver sequentially provides gate signals to the first gate lines during a first period and to the second gate lines during a second period after the first period. This temporal segmentation allows the sensor unit to operate during the period when gate signals are being provided to the second gate lines, enabling touch sensing without interfering with image display.
2Measurement precision
If the sensor unit operates continuously to sense touch inputs at high frequency, then touch input detection accuracy is improved, but display quality is degraded due to sensing interference
Solution Approach 1:
The gate driver operates in a periodic manner, sequentially providing gate signals to first gate lines during a first period and to second gate lines during a second period. The sensor unit is configured to sense touch inputs during the second period when gate signals are being provided to the second gate lines. This periodic operation enables continuous touch sensing at high frequency while maintaining display quality by avoiding simultaneous operation conflicts.
3Adaptability or versatility
If interlaced scanning is used to allocate sensing periods, then touch sensing capability is improved, but device complexity increases
Solution Approach 1:
The gate lines are segmented into first gate lines and second gate lines with alternating arrangement. The gate driver is divided into a first gate driver for providing gate signals to first gate lines and a second gate driver for providing gate signals to second gate lines. This segmentation enables interlaced scanning operation where the sensor unit can operate during allocated periods without requiring complete redesign of the gate driver architecture.
Solution Approach 2:
The gate driver is designed with multi-functionality to operate in both progressive scanning mode (for normal display operation) and interlaced scanning mode (for touch sensing). The same gate driver circuitry can sequentially provide gate signals to different gate line sets based on control signals, enabling the system to adapt between different operating modes without requiring separate dedicated circuits for each function.
Data Source
AI summary
A display device includes a display panel. The display panel includes pixels connected to gate lines and data lines. A sensor overlaps the display panel. A gate driver is configured to provide a gate signal to the gate lines. In a first mode, the gate driver provides the gate signal to the gate lines using progressive scanning. In a second mode, the gate driver provides the gate signal using interlaced scanning, and the sensor operates in a period allocated between periods in which a first interlaced scanning operation and a second interlaced scanning operation are performed within one frame period.