Liquid Crystal Display Panel Array Test Circuit Voltage Stabilization
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Solution Overview
Problem
In liquid crystal display panels, nonuniform node voltage levels during array testing lead to inconsistent data line leakages, resulting in nonuniform image display and reduced product quality.
Innovation Solution
The liquid crystal display panel incorporates an array test circuit with a test control unit comprising both N-type and P-type thin film transistors, where one transistor acts as an output transistor and the other as a voltage stabilization transistor, ensuring consistent voltage levels during normal display by activating the voltage stabilization transistor when the test control signal is low.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If array test circuit is used to test data lines, then manufacturing quality control is improved, but node voltage becomes unstable causing nonuniform image display
Solution Approach 1:
The patent applies preliminary action by adding a voltage stabilization transistor that is activated before normal display operation to preset the node voltage to a stable level. The test control signal enables the voltage stabilization transistor to perform preliminary voltage stabilization, preventing the floating voltage state that causes nonuniform leakage and image display issues.
2Adaptability or versatility
If test control signal is applied to activate transistors, then array testing function is improved, but voltage leakage consistency deteriorates during normal display
Solution Approach 1:
The patent applies dynamics by making the transistor configuration adaptable through the test control signal. The voltage stabilization transistor is dynamically activated or deactivated based on the test control signal state. During normal display, the voltage stabilization transistor is activated to ensure consistent voltage leakage, while during array testing, the testing function takes precedence.
3Device complexity
If simple test circuit configuration is used, then device complexity is reduced, but image display uniformity deteriorates due to voltage instability
Solution Approach 1:
The patent applies local quality by adding voltage stabilization specifically at the critical node where voltage instability causes image display nonuniformity. The voltage stabilization transistor is strategically placed to stabilize the node voltage without requiring complete redesign of the entire test circuit, thus maintaining relatively simple overall structure while improving image display uniformity at the critical location.
Data Source
AI summary
The present invention provides a liquid crystal display panel. The array test circuit (200) comprises a test control unit including a N type thin film transistor and a P type thin film transistor, wherein one thin film transistor is employed to be the output thin film transistor, and the other thin film transistor is employed to be the voltage stabilization thin film transistor. When the liquid crystal display panel is in the normal display state, the test control signal (ATEN) controls the output thin film transistor to be deactivated and controls the voltage stabilization thin film transistor to be activated so that the voltage difference of the gate and the source of the output thin film transistor is zero. Thus, the leakages on the data lines in the active display area (100) are consistent.