LCD Array Substrate Dual Switching Element Defect Repair
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Solution Overview
Problem
In liquid crystal displays (LCDs), dot defects often occur due to TFT failures or shorting, leading to incomplete pixel failure, which cannot be fully repaired, affecting the yield and display quality.
Innovation Solution
The array substrate design includes a crosswise arrangement of scan and data lines with first and second sub-pixel electrodes, where the second switching element can control the first sub-pixel electrode in place of the first when the first fails, allowing for partial or full repair of dot defects by electrical connections through drain electrode extensions and auxiliary metal layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a pixel is divided into two sub-pixels with separate switching elements, then the viewing angle is improved, but the reliability deteriorates because dot defects cannot be fully repaired
Solution Approach 1:
The patent makes the second switching element capable of controlling both the second sub-pixel electrode and the first sub-pixel electrode. When the first switching element fails, the second switching element can take over and control the first sub-pixel electrode through the shared data line, enabling full repair of dot defects while maintaining the two sub-pixel structure for wide viewing angle
Solution Approach 2:
The patent changes the electrical connection parameters by extending the data line to connect both sub-pixel electrodes to the second switching element. This parameter change allows the second switching element to control both sub-pixels, transforming the system from one where each switching element controls only its dedicated sub-pixel to one where the second switching element has universal control capability
2Manufacturing precision
If two switching elements control two sub-pixel electrodes respectively, then the display quality is improved, but the manufacturing cost increases
Solution Approach 1:
The patent makes the second switching element universal by enabling it to control both sub-pixel electrodes. This reduces manufacturing complexity because the second switching element serves dual purposes: normal operation control of the second sub-pixel and backup control of the first sub-pixel when the first switching element fails, eliminating the need for additional repair structures
Solution Approach 2:
The patent merges the control function of the first and second switching elements by allowing the second switching element to control both sub-pixel electrodes. The data line is extended to combine the control paths, reducing the number of independent control circuits needed and simplifying the overall structure
Data Source
AI summary
The present invention provides a liquid crystal display and an array substrate thereof. The array substrate comprises scan lines, data lines and a plurality of pixel defined by a crosswise arrangement of the scan lines and the data lines. The pixel comprises a first sub-pixel electrode; a second sub-pixel electrode electrically isolated from the first sub-pixel electrode; a first switching element for controlling the first sub-pixel electrode; and a second switching element for controlling the second sub-pixel electrode. When the control of the first sub-pixel electrode by the first switching element cannot be carried out normally, the second switching element can control at least a part of the first sub-pixel electrode in place of the first switching element.