In-Cell Touch Panel Fault Detection via Segmented Common Electrodes
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Solution Overview
Problem
Conventional touch panels integrated with liquid crystal panels face challenges in efficiently detecting faulty TestPoints (TPs) that can result in open circuits, hindering the realization of thinner and lighter designs.
Innovation Solution
A display panel design where common electrodes are divided into a matrix and connected to a touch chip via detection circuits, with switch control circuits controlling voltage settings to detect malfunctions by comparing display states against a standard pattern, allowing for efficient detection of TP circuit faults.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If touch functions are incorporated into liquid crystal panels (in-cell technology), then the panel thickness and weight are reduced, but TestPoints connecting to pixels may become faulty resulting in open circuits
Solution Approach 1:
The common electrode is divided into multiple areas, with each area's detection circuit controlled by different switch control circuits. This segmentation allows independent control and detection of different regions, enabling faulty TestPoints to be identified without affecting the entire panel structure, thus maintaining the thin design while improving reliability.
Solution Approach 2:
The patent implements preliminary detection capabilities by incorporating detection circuits that can identify TestPoint faults before they result in complete panel failure. The switch control circuits enable pre-active detection and isolation of faulty areas, preventing open circuits from propagating and maintaining panel functionality.
2Measurement precision
If detection circuits are added to detect TestPoint faults, then fault detection capability is improved, but the device structure becomes more complex
Solution Approach 1:
The detection circuits serve multiple functions: they detect TestPoint faults, control common electrode voltage segments, and enable region-specific operations. By making the detection circuits multi-functional, the patent reduces the need for separate dedicated fault detection components, thereby improving measurement precision while limiting the increase in device complexity.
Solution Approach 2:
The patent merges the detection circuit functionality with the existing common electrode control structure. The switch control circuits are integrated into the display panel's existing architecture, combining fault detection with voltage control functions in a unified system, which improves detection capability without proportionally increasing overall structural complexity.
3Productivity
If common electrodes are divided into multiple areas with different switch control circuits, then fault detection efficiency is improved, but the control system complexity increases
Solution Approach 1:
The common electrode is segmented into multiple areas, each controlled by dedicated switch control circuits. This segmentation enables parallel detection of multiple regions simultaneously, significantly improving fault detection efficiency. The modular nature of segmented control allows systematic fault isolation without requiring complex centralized control logic.
Solution Approach 2:
The switch control circuits enable dynamic control of different common electrode areas, allowing the system to adaptively activate detection in specific regions based on operational needs. This dynamic control capability improves detection efficiency by focusing resources on areas requiring monitoring while simplifying the active control configuration at any given time.
Data Source
AI summary
A display panel with touch function and a fault detection method are disclosed. The display panel includes a display component and a touch component sharing common electrodes. The common electrodes are divided into a plurality of areas arranged in a matrix. The common electrode within each area connects to a touch chip via detection circuits. The display panel further comprises at least two switch control circuits for controlling the detection circuits corresponding to a plurality of areas in a predetermined manner such that the common electrode within each area and the common electrode within an adjacent area are controlled by different switch control circuits. When the display component is in a display state, at least two switch control circuits are configured to set up a common voltage for the common electrode in the plurality of areas. The display states of the display component in the plurality of areas are detected to determine a malfunction of the detection circuit. In this way, the TP circuit detection may be performed in an easier and more efficient way.