Gate Pulse Extension for Inducing Signal Stability
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Solution Overview
Problem
Embedded input panels with inducing circuits experience non-uniform induction sensitivity due to current leakage during the blanking time, affecting the identification accuracy of touch inputs, especially at the top portion of the display panel.
Innovation Solution
Extending the driving duration of the gate pulse to the blanking time between frames for the last gate line or introducing a dummy gate line driven during this time to maintain a stable inducing signal level, ensuring consistent induction sensitivity across the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gate pulse driving duration is limited to the active frame period, then the display refresh rate is maintained, but the inducing signal level becomes unstable during blanking time causing non-uniform induction sensitivity
Solution Approach 1:
The gate pulse for the last gate line is extended into the blanking time period in advance, before the next frame begins. This preliminary action maintains the inducing signal level stability during the transition between frames, preventing the non-uniform induction sensitivity that would otherwise occur at the top portion of the display panel.
Solution Approach 2:
The gate pulse duration is extended to ensure continuous driving of the inducing circuits throughout the frame period including the blanking time. This continuity maintains stable inducing signal levels and ensures uniform induction sensitivity across all portions of the display panel, eliminating the degradation that occurs when gating is interrupted.
2Reliability
If a dummy gate line is added to drive during blanking time, then the inducing signal level is stabilized, but the gate line count and circuit complexity increase
Solution Approach 1:
The last gate line is given dual functionality: it serves both as a regular gate line for pixel driving during the active frame period and as a blanking-time driving line for maintaining inducing signal stability. This eliminates the need for a separate dummy gate line while achieving the same stabilizing effect.
Solution Approach 2:
The existing gate driver circuitry is utilized to extend the gate pulse into the blanking period, allowing the system to self-maintain inducing signal stability without requiring additional dedicated circuits or components. The last gate line effectively serves itself as the blanking-time driving element.
Data Source
AI summary
A display apparatus and a method for driving a display panel thereof are provided. The display panel includes an inducing signal readout line and N gate lines, in which N is a natural number. The inducing signal readout line is coupled to a plurality of inducing circuits. Each inducing circuit is coupled to one of the gate lines, and the Nth gate line is coupled to one of the inducing circuits. In the method, several gate pulses are provided to drive the gate lines sequentially to turn on the corresponding inducing circuits, wherein at least a portion of the driving duration of a gate pulse provided to the Nth gate line is in a blanking time between two frames.