Liquid Crystal Display Drive Chip Adaptive Gamma and Vcom Compensation
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Solution Overview
Problem
The electrical properties of thin film transistors in liquid crystal display devices drift over time due to charge accumulation at the amorphous silicon and silicon nitride interface, causing the gamma curve and common voltage to deviate from target values, leading to a degradation in display quality.
Innovation Solution
A drive method for liquid crystal display devices that involves burning multiple sets of OTP data corresponding to different use durations into a drive chip, each set containing gamma and Vcom data, allowing the chip to select the appropriate data based on the device's usage duration to maintain target gamma and best Vcom values, ensuring consistent display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If Gamma adjustment and Flicker adjustment are performed before the TFT-LCD leaves the factory, then the gamma value is adjusted to the target gamma value (2.2) and the common voltage is adjusted to the best Vcom, but the electrical property of the thin film transistor drifts as time goes by, causing the gamma curve to deviate from gamma 2.2 and the Vcom value to deviate from the best Vcom
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing multiple sets of gamma data and Vcom data corresponding to different usage durations (e.g., 0.5 year, 1 year, 1.5 years, 2 years, 2.5 years, 3 years) in the drive chip before the device is put into use. This allows the system to proactively compensate for the anticipated drift in thin film transistor electrical properties over time, rather than relying solely on factory adjustments.
Solution Approach 2:
The patent implements dynamics by enabling the drive chip to dynamically select different sets of gamma data and Vcom data based on the actual usage duration of the display device. The system transitions from a static factory-adjusted state to a dynamic adaptive state where compensation parameters are automatically updated according to the device's age, thereby maintaining display quality throughout the product lifecycle.
2Reliability
If multiple sets of OTP data corresponding to different use durations are burned in the drive chip, then the device can select appropriate data based on usage duration to maintain target gamma and best Vcom values, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the compensation data into multiple discrete sets, each corresponding to a specific usage duration range. Instead of implementing a complex continuous adjustment model, the system segments the time domain into distinct intervals (e.g., 0.5 year, 1 year, 1.5 years, etc.), with each segment having pre-calibrated gamma and Vcom data. This simplifies the overall system architecture while maintaining effectiveness.
Solution Approach 2:
The patent utilizes parameter changes by storing multiple sets of compensation parameters (gamma data and Vcom data) with different numerical values corresponding to different usage durations. The drive chip selects the appropriate parameter set based on the current usage time, effectively changing the compensation parameters to match the device's aging state without requiring complex real-time calculation algorithms.
Data Source
AI summary
The present provides a drive method of a liquid crystal display device and a liquid crystal display device. By burning sets of OTP data corresponding to the use durations which are different in a drive chip, and each set of OTP data comprises a gamma datum and a Vcom datum, and the liquid crystal display device selects the OTP data corresponding to the use duration according to the present use duration, and uses the gamma datum and the Vcom datum in the set of OTP data to drive a display panel to perform image display for avoiding that the gamma value deviates from the target gamma value, and the Vcom deviates from the best Vcom to ensure that the liquid crystal display device always uses the target gamma value and the best Vcom for driving, and always guarantee the display result and quality of the panel.