Field-Sequential LCD Color Distortion Compensation
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Solution Overview
Problem
Field-sequential driving methods in liquid crystal display devices cause color distortion, particularly when displaying yellow, due to the cumulative response characteristic of liquid crystals, which results in incorrect light transmittance and brightness contributions from red and green lights.
Innovation Solution
The method involves dividing a frame into green, red, and blue sub-frames and sequentially applying data signals and corresponding light sources to the liquid crystal cells, ensuring that a green light is transmitted first, followed by a red light, to adjust the light transmittance and prevent color distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a field-sequential driving method is used to increase brightness, then the backlight intensity loss is reduced, but color distortion occurs due to cumulative response characteristics of liquid crystal
Solution Approach 1:
The patent applies preliminary action by pre-compensating the data signals before they are applied to the liquid crystal cells. The compensation is based on predicted cumulative response characteristics, adjusting the green and red data signals in advance to counteract the expected transmittance distortion. This allows the system to maintain color accuracy while using field-sequential driving with colored backlight sources.
Solution Approach 2:
The patent changes the parameters of the data signals dynamically based on the current display content and cumulative response state. By adjusting the intensity and timing parameters of green and red data signals according to the displayed color (e.g., reducing green signal when yellow is displayed), the system compensates for cumulative response effects and maintains accurate color reproduction throughout the field-sequential driving cycle.
2Illumination intensity
If green light is displayed first followed by red light, then brightness contribution is improved, but color distortion occurs due to incorrect light transmittance
Solution Approach 1:
The patent implements feedback by continuously monitoring the cumulative response state of the liquid crystal and adjusting subsequent data signals accordingly. The system uses the transmittance characteristics from previous frames to inform compensation adjustments in the current frame, creating a closed-loop control system that maintains accurate light transmittance and color accuracy throughout the field-sequential driving sequence.
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
This approach prevents or reduces color distortion by ensuring the green light contributes more to the brightness, thereby correcting the light transmittance and maintaining accurate color representation, especially for yellow colors.
Implementation Method 1
a liquid crystal 8 is provided between the upper substrate 2 and the lower substrate 12
Data Source
AI summary
A liquid crystal display device and a driving method thereof for preventing a color distortion phenomenon in a field-sequential driving system are disclosed. In the liquid crystal display device, a data driver sequentially supplies a green data signal, a red data signal and a blue data signal to the data lines. A gate driver applies a scanning pulse to gate lines. A light source irradiates a green light onto a liquid crystal cell during a time interval when the green data signal is maintained at the liquid crystal cell, irradiates a red light onto the liquid crystal cell during a time interval when the red data signal is maintained at the liquid crystal cell, and irradiates a blue light to the liquid crystal cell during a time interval when the blue data signal is maintained at the liquid crystal cell.