In-Cell Touch Screen Electrical Testing via Visual Field Observation
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Solution Overview
Problem
Current electrical testing methods for in-cell touch screens, such as waveform judgment and capacitance direct measuring, are costly, require specialized equipment, and have low detection efficiency and accuracy due to complex judgment rules and the need for professional training, as well as lengthy measurement times.
Innovation Solution
A method involving floating the display electrode and applying predetermined voltages to columns or rows of driving and detecting lines, observing display pictures to determine if lines are shorted or opened, and using a simple, integrated testing device to improve efficiency and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If waveform judgment method is used with special electrical device, then detection accuracy can be improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent replaces the complex electrical measurement system (waveform judgment method requiring special electrical devices, computers, and software) with a visual observation system. By applying voltages to driving and detecting lines and observing display pictures directly, the system substitutes electrical measurement with optical observation, thereby reducing device complexity while maintaining detection capability.
Solution Approach 2:
The patent creates a visual copy of the electrical line status through display pictures. Instead of directly measuring electrical waveforms with complex equipment, the system generates visual representations (display pictures) that copy the state of driving and detecting lines, allowing simple visual inspection to replace complex electrical measurement.
2Device complexity
If capacitance direct measuring method is used, then device complexity is reduced, but detection efficiency decreases due to sequential measurement requirement
Solution Approach 1:
The patent merges the measurement of multiple driving lines and detecting lines into a single integrated testing process. By applying voltages to groups of lines simultaneously and observing the combined display picture, the system measures multiple lines in parallel rather than sequentially, thereby improving detection efficiency while using simple equipment.
Solution Approach 2:
The patent transitions from one-dimensional sequential electrical measurement to two-dimensional parallel visual observation. By displaying the status of multiple lines simultaneously on a display screen, the system adds a spatial dimension to the measurement process, allowing multiple lines to be inspected at once rather than one after another.
3Measurement precision
If waveform judgment method is used with artificial comparison, then detection accuracy can be maintained, but loss of time increases due to manual operation
Solution Approach 1:
The patent enables the testing system to self-display its results through the display picture. The driving and detecting lines themselves provide the test information by generating visible display patterns when voltages are applied, eliminating the need for external waveform measurement equipment and manual analysis. The system serves its own testing function through visual self-display.
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 allows for simultaneous examination of multiple lines, reduces testing time and cost, and enhances detection accuracy by visual observation of electric field distribution without complex waveform comparisons or direct capacitance measurements.
Implementation Method 1
applying a first predetermined voltage to one column of adjacent columns of the driving line or one row of adjacent rows of the driving line... applying a second predetermined voltage to one column of adjacent columns of the detecting line or one row of adjacent rows of the detecting line
Implementation Method 2
a liquid crystal display includes a color film substrate and an array substrate... observing a display picture of the in-cell touch screen
Data Source
AI summary
A method of electrically testing an in-cell touch screen is disclosed. The in-cell touch screen includes a display electrode, a driving line, and a detecting line. The detecting line intersects the driving line. The method includes floating the display electrode and performing at least one of: A) applying a first predetermined voltage to one column of adjacent columns of the driving line or one row of adjacent rows of the driving line, and grounding the other column of the adjacent columns or the other row of the adjacent rows, and B) applying a second predetermined voltage to one column of adjacent columns of the detecting line or one row of adjacent rows of the detecting line, and grounding the other column of the adjacent columns or the other row of the adjacent rows. The method also includes determining whether the driving line or the detecting line is shorted or opened.