Dummy Gate Scan Signals for Display Panel Artifact Mitigation
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Solution Overview
Problem
Display updating in user interface devices causes interference with proximity sensing, leading to undesired brightness unevenness or artifacts due to charge leakage during long horizontal blank periods in display panels.
Innovation Solution
Incorporating dummy gate scan signals to control the initialization of display lines during long horizontal blank periods, reducing the time duration between initialization and programming and thereby minimizing charge leakage and brightness unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a long horizontal blank period is used to suppress interference between display updating and proximity sensing, then proximity sensing accuracy is improved, but charge leakage occurs causing brightness unevenness and artifacts
Solution Approach 1:
The display panel divides the gate driving function into multiple independent scan driving circuits (first, second, third scan driving circuits) that operate on different display lines. This segmentation allows different lines to be initialized at different times, with some lines initialized during the LHB period while others are programmed, thereby preventing uniform charge leakage across all lines and eliminating brightness artifacts.
Solution Approach 2:
The patent applies preliminary initialization action by using the second scan driving circuit to initialize the second display line during the LHB period before the third scan driving circuit programs it in the subsequent horizontal sync period. This preliminary initialization ensures that pixel circuits are ready and stable before programming, preventing charge leakage-induced brightness unevenness while maintaining proximity sensing accuracy during the LHB period.
2Measurement precision
If initialization and programming are performed in separate horizontal sync periods, then proximity sensing during LHB is enabled, but display line update speed decreases
Solution Approach 1:
The gate driving function is segmented across multiple independent scan driving circuits that operate simultaneously on different display lines. While the second scan driving circuit initializes the second display line during the LHB period, the first and third scan driving circuits program their respective lines in parallel, maintaining high overall update speed while enabling proximity sensing.
Solution Approach 2:
The patent transitions from a sequential single-circuit gate driving approach to a parallel multi-circuit approach, adding the dimension of spatial parallelism. Multiple scan driving circuits operate simultaneously on different display lines, allowing initialization and programming to occur in different temporal dimensions without compromising overall productivity.
Data Source
AI summary
A display panel includes a first scan driving circuit, a second scan driving circuit, and a third scan driving circuit. The first scan driving circuit is configured to generate a first gate scan signal to control programming of a first display line in a first horizontal sync period that includes a long horizontal blank (LHB) period. The second scan driving circuit is configured to generate a first dummy gate scan signal to control initialization of a second display line in the LHB period of the first horizontal sync period. The third scan driving circuit is configured to generate a second gate scan signal to control programming of the second display line in a second horizontal sync period that follows the first horizontal sync period.