Display Panel Ageing Circuit for Brightness Stability
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Solution Overview
Problem
Display panels, particularly TFT-LCDs, experience brightness attenuation due to manufacturing processes and materials, leading to unqualified products that are difficult to identify and reject before shipment, as traditional ageing methods are time-consuming and inconvenient.
Innovation Solution
A circuit for ageing display panels is introduced, comprising an ageing signal input circuit, a power input circuit, and a power output circuit, which independently connect to a load, allowing for controlled voltage adjustments to accelerate the ageing process by adding an ageing signal to the power output, thereby increasing the voltage difference between on and off states, thus identifying defective panels more efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional ageing methods are used for display panels, then the brightness attenuation can be detected, but the process takes a long period of time and reduces productivity
Solution Approach 1:
The patent applies parameter changes by modifying the voltage parameters during the ageing process. Specifically, it uses different voltage levels (first voltage and second voltage) applied through the ageing circuit to accelerate the ageing effect. By changing voltage parameters, the system achieves faster ageing detection without compromising brightness stability assessment
Solution Approach 2:
The patent implements periodic action through the switching mechanism that alternates between different voltage states. The ageing circuit switches between first voltage and second voltage in a periodic manner, creating accelerated ageing conditions that reveal brightness attenuation faster than continuous static ageing methods
2Reliability
If traditional ageing methods are used for display panels, then the brightness attenuation can be detected, but the process requires certain environment and is inconvenient for operation
Solution Approach 1:
The patent applies self-service by designing the ageing circuit to automatically control the ageing process. The circuit includes switching elements and control logic that autonomously manage voltage application without requiring complex external environment control. This makes the ageing process more convenient and easier to operate while maintaining reliability assessment
Solution Approach 2:
The patent uses an intermediary approach by introducing an ageing circuit as a mediator between the power supply and the display panel. This intermediary circuit simplifies the operation by handling voltage control and switching internally, eliminating the need for complex external environment setup and making the ageing process more convenient
Data Source
AI summary
Provided herein is a circuit for ageing display panel, including an ageing signal input circuit, a power input circuit and a power output circuit, in which the ageing signal input circuit and the power input circuit are independently connected to the power output circuit, and the power output circuit is connected to a load; the ageing signal input circuit is configured to receive an ageing signal and output the ageing signal to the power output circuit; the power input circuit is configured to provide a supply voltage for the power output circuit; and the power output circuit is configured to output the received supply voltage to the load.