Integrated Touch Sensor Inspection for LCD Manufacturing Yield
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Solution Overview
Problem
The manufacturing costs of LCDs with integrated touch screen panels are high, and the process of attaching these panels reduces yield, luminance, and increases thickness, with no effective inspection method for defects in the sensing signal generator during the manufacturing process.
Innovation Solution
A display device with a network of signal lines, sensor signal lines, inspection switching elements, and test signal lines that allow for a method to test and inspect the functionality of sensing units integrated into the LCD, enabling detection of defects and improving manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch screen panels are attached to LCDs, then writing or drawing functionality is enabled, but manufacturing costs increase and yield decreases
Solution Approach 1:
The patent merges the touch screen sensing units with the LCD pixel structure by integrating sensing units into the pixel electrodes, allowing both display and touch functionality to coexist in a single structure, thereby eliminating the need for separate touch panel attachment and improving manufacturing yield
Solution Approach 2:
The pixel electrodes are designed to serve dual purposes: as display elements for image output and as sensing units for touch detection, enabling the LCD to perform both visual display and touch input functions without requiring additional components
2Adaptability or versatility
If touch screen panels are attached to LCDs, then writing or drawing functionality is enabled, but luminance is reduced
Solution Approach 1:
The patent merges the touch screen sensing units with the LCD pixel structure by integrating sensing units into the pixel electrodes, allowing both display and touch functionality to coexist in a single structure, thereby eliminating the need for separate touch panel attachment and improving manufacturing yield
3Adaptability or versatility
If touch screen panels are attached to LCDs, then writing or drawing functionality is enabled, but thickness increases
Solution Approach 1:
The patent merges the touch screen sensing units with the LCD pixel structure by integrating sensing units into the pixel electrodes, allowing both display and touch functionality to coexist in a single structure, thereby eliminating the need for separate touch panel attachment and improving manufacturing yield
4Adaptability or versatility
If sensing units are integrated into pixels, then touch detection capability is enabled, but inspection of sensing signal generator defects becomes difficult
Solution Approach 1:
The patent implements preliminary inspection actions by providing inspection signal lines and inspection switching elements that allow the sensing signal generator to be tested before final assembly, enabling defect detection at an early stage when repairs are more feasible
Solution Approach 2:
The patent introduces intermediary inspection components (inspection signal lines and inspection switching elements) that facilitate the detection of defects in the sensing signal generator by providing a dedicated testing pathway separate from the normal operating signals
5Measurement precision
If inspection methods are added for sensing units, then defect detection capability is improved, but device complexity increases
Solution Approach 1:
The patent introduces intermediary inspection components (inspection signal lines and inspection switching elements) that facilitate the detection of defects in the sensing signal generator by providing a dedicated testing pathway separate from the normal operating signals
Data Source
AI summary
A method of economically manufacturing display devices having a matrix of drivable pixels arranged in rows and columns arranged to be driven by IC drivers, including the steps of including a plurality of sensor signal lines in the display device that are selectively connectable to certain of the pixel rows, a plurality of sensor signal lines selectively connectable to certain of the pixel columns, transmitting test signals to test predetermined ones of the rows and columns of pixels, and connecting pixel driving circuits to those display devices exhibiting uniform pixel brightness in response to the test signals.