Liquid Crystal Display Driving Method Synchronizing Pixel Response
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Solution Overview
Problem
Color sequence liquid crystal displays face issues with non-uniform luminance and shifting gamma curves due to varying response times of liquid crystal molecules across different rows of pixels, leading to incomplete response before the backlight is turned on, resulting in suboptimal display performance.
Innovation Solution
A driving method that adjusts the time points for outputting pixel voltages and adjusting electrode voltages to synchronize the transmittance of pixels across different rows, ensuring that the integrated light intensity values are within 20% of each other, thereby equalizing light intensity and reducing gamma curve shifting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the driving frequency is increased to 180 Hz to display color sequences, then the color display capability is improved, but the liquid crystal molecule response time becomes insufficient causing non-uniform luminance
Solution Approach 1:
The patent applies preliminary action by outputting pixel voltages to different rows of pixels at different time points before the backlight is turned on. Specifically, voltages are output to first row pixels, then to second row pixels, ensuring that liquid crystal molecules in each row have sufficient time to respond completely before the backlight activates, thereby maintaining uniform luminance across the display at high driving frequencies
2Reliability
If pixel voltages are outputted sequentially to different rows, then the liquid crystal molecules have sufficient response time, but the light intensity across different rows becomes non-uniform
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the timing parameters of voltage output and backlight activation. The control circuit outputs pixel voltages to different rows at specifically controlled time points and activates the backlight at a predetermined time point after all voltages are outputted, ensuring both complete liquid crystal response and uniform light intensity across all pixel rows
3Loss of time
If the backlight is turned on immediately after voltage output, then the response time requirement is met, but gamma curve shifting occurs due to incomplete response
Solution Approach 1:
The patent applies preliminary action by completing the voltage output to all pixel rows before activating the backlight. The control circuit sequentially outputs voltages to first row pixels, then second row pixels, and only after all voltages are fully outputted does it activate the backlight, ensuring liquid crystal molecules have sufficient time to respond completely and maintain consistent gamma curves across the display
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method effectively addresses non-uniform luminance and gamma curve shifting by synchronizing light intensity across pixels, enhancing display uniformity and luminance, and extending the response time of liquid crystal molecules.
Implementation Method 1
the liquid crystal molecule has to finish the response before the backlight module lights up
Data Source
AI summary
A driving method applied to a liquid crystal display. First, a first pixel voltage is outputted to a first pixel in a first row of pixels to change a transmittance of the first pixel. Next, a second pixel voltage is outputted to a second pixel in a second row of pixels to change a transmittance of the second pixel. Then, a backlight module is turned on. Next, at a first predetermined time point after the first pixel voltage is outputted, a pixel electrode voltage of the first pixel is adjusted. Finally, at a second predetermined time point after the second pixel voltage is outputted, a pixel electrode voltage of the second pixel is adjusted. The second predetermined time point follows the first predetermined time point.