Liquid Crystal Display Switch Unit for Mura Detection
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Solution Overview
Problem
The existing methods for detecting the source of Mura in liquid crystal displays are time-consuming and require additional processes, such as drilling holes for soldering and measuring input and output voltages, making it difficult to determine the cause of uneven display brightness efficiently.
Innovation Solution
A liquid crystal display with a switch unit that connects the drive power line to all scan lines under control signal control, allowing simultaneous driving of scan lines to differentiate between Mura caused by array and cell processes without the need for additional processes or detection devices, and optionally includes an electrical fuse to prevent unintended activation and enhance anti-static discharging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the existing testing method is used to detect the source of Mura, then the detection can be performed, but the detection time is relatively long and additional processes (drilling holes for soldering) are required
Solution Approach 1:
The patent applies preliminary action by pre-establishing a switch unit connection between the drive power line and scan lines during manufacturing. This allows the detection process to directly utilize existing connections without requiring additional drilling or soldering operations, thereby reducing detection time while avoiding increased manufacturing complexity
Solution Approach 2:
The switch unit serves as an intermediary component that enables direct electrical connection between the drive power line and scan lines. This intermediary structure eliminates the need for complex drilling and soldering processes, allowing rapid detection without adding manufacturing steps
2Measurement precision
If all scan lines are driven simultaneously to eliminate Mura caused by TFT features, then the detection accuracy is improved, but the control complexity increases
Solution Approach 1:
The patent merges the control of all scan lines into a single unified switch unit that responds to one control signal. This allows simultaneous driving of all scan lines for accurate detection while avoiding the complexity of individually controlling each scan line, as the switch unit consolidates the control function
Solution Approach 2:
The switch unit is designed with multi-functionality, serving both as a connection element during manufacturing and as a control element for simultaneous scan line driving. This universal component handles both the electrical connection and the synchronized control, reducing overall system complexity while maintaining detection accuracy
Data Source
AI summary
A liquid crystal display and a method for testing the liquid crystal display are disclosed. The liquid crystal display includes a TFT substrate including M scan lines and N data lines, a drive power line, and a switch unit adapted to connect the drive power line to the M scan lines under control of a control signal during a detection of a source of Mura of the liquid crystal display. The testing method includes: applying the control signal to the switch unit; applying a data signal to the N data lines; determining the source of the Mura of the liquid crystal display according to a current brightness of the liquid crystal display; and stopping applying the control signal to the switch unit.