Embedded Touch Panel Fault Detection via Luminance Contrast
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Solution Overview
Problem
In in-cell touch screen technology, touch electrodes are prone to open-circuit or short-circuit issues, making it difficult to detect faults quickly and effectively, which hampers touch-control operations.
Innovation Solution
A detecting method where touch electrodes are alternately arranged and supplied with different voltage levels via touch-control wires to differentiate between normal and faulty states, allowing for quick identification of short-circuits and open-circuits by observing luminance changes on the touch panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If touch electrodes are used in in-cell touch screen technology, then the panel becomes lighter and thinner, but the touch electrodes are prone to open-circuit or short-circuit issues
Solution Approach 1:
The patent applies preliminary action by conducting detection of touch electrodes before the panel is shipped or installed. The detection method involves applying voltage to touch electrodes through touch-control wires and observing the response to identify open-circuit or short-circuit faults early, preventing defective panels from reaching users.
Solution Approach 2:
The patent implements feedback by establishing a detection mechanism that provides real-time information about the electrical state of touch electrodes. The system applies voltage and monitors the response (light emission or lack thereof) to feedback the status of each electrode, enabling identification of faulty electrodes without requiring physical inspection.
2Ease of operation
If traditional capacitance change detection is used for touch electrodes, then touch-control operation is realized, but it is difficult to quickly and effectively detect short-circuit faults
Solution Approach 1:
The patent utilizes optical response (analogous to color changes) by applying voltage to touch electrodes and observing the light emission from the display area. When voltage is applied to a healthy electrode, the corresponding display area emits light; when an electrode is short-circuited or open-circuited, the light emission pattern changes, providing visual feedback about the electrode's status.
Solution Approach 2:
The patent replaces complex electrical measurement systems with a simpler optical observation system. Instead of using sophisticated capacitance measurement equipment to detect short-circuits, the method uses the human eye or simple optical sensors to detect light emission patterns, significantly simplifying the detection process and making it more accessible for quality control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method enables simple and effective detection of touch electrode faults by creating an alternate light and shade pattern, allowing for quick identification of short-circuits and open-circuits, thereby ensuring reliable touch-control operations.
Implementation Method 1
supplying a low voltage level to first touch electrodes via corresponding touch-control wires to make display areas where the first touch electrodes are located be in dark states; supplying a high voltage level to second touch electrodes via corresponding touch-control wires to make display areas where the second touch electrodes are located be in bright states
Data Source
AI summary
A detecting method and a manufacturing method of an embedded type touch panel are provided. The detecting method includes steps of: supplying first touch electrodes and second touch electrodes alternately arranged at least on a first direction with different voltages via corresponding touch-control wires to make display areas where the first touch electrodes are located and display areas where the second touch electrodes are located have different luminances, and at least determining neighboring first touch electrode and second touch electrode on the first direction whether are short-circuited or not according to the luminances of the display areas where the first touch electrodes are located and the luminances of the display areas where the second touch electrodes are located. By the above solution, the invention can simply and effectively realize a detection of touch panel.