Display Panel Data Line Voltage Delay Compensation
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Solution Overview
Problem
In TFT-LCD display panels, the inconsistent resistance and voltage change delays of data lines in the fan-out area lead to color shift issues due to unequal effective charging times of pixels on the same scan line, with traditional solutions increasing costs either by using copper materials or reducing output channels of driver ICs.
Innovation Solution
A driving method and apparatus that detect voltage change delay times of data lines, adjust data output signals, and synchronize scan line driving voltage signals to ensure consistent effective charging times across different data lines, without altering the process or increasing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If data lines in the fan-out area are made with copper material, then voltage change delay consistency is improved, but manufacturing cost increases
Solution Approach 1:
The patent changes the timing parameters of data output signals by adjusting the failing edge time based on the length of data lines in the fan-out area. This parameter adjustment compensates for the voltage change delay differences caused by varying wire lengths, achieving consistent effective charging times without changing the physical material properties or increasing manufacturing cost.
2Manufacturing precision
If the number of output channels of each driver IC is decreased, then voltage change delay consistency is improved, but the number of driver ICs increases and cost increases
Solution Approach 1:
The patent adjusts the failing edge time parameter of data output signals based on the position and wire length of each data line. This allows all output channels of each driver IC to be utilized effectively while compensating for RC delays through timing adjustments, maintaining the original driver IC configuration without increasing device complexity or cost.
3Adaptability or versatility
If data lines in the fan-out area have different wire lengths, then layout flexibility is improved, but effective charging time consistency deteriorates
Solution Approach 1:
The patent performs preliminary calculation of the failing edge time for each data line based on its length and resistance characteristics before actual operation. By pre-determining the appropriate failing edge time for each data line according to its specific geometry, the system compensates for RC delays in advance, ensuring consistent effective charging times while maintaining layout flexibility.
Solution Approach 2:
The patent dynamically adjusts the failing edge time parameter of data output signals according to the specific length and resistance of each data line. This parameter customization for each data line compensates for the varying RC delays caused by different wire lengths, achieving effective charging time consistency without compromising layout adaptability.
Data Source
AI summary
A driving method and a driving apparatus of a display panel are provided. The driving method includes: detecting voltage change delay times of data lines in a fan-out area; controlling data output signals of the data lines according to the voltage change delay times; and adjusting a scan line driving voltage signal according to the data output signal and thereby making effective charging times of pixels driven by different data lines be consistent.