Liquid Crystal Display Driving Method for Color Shift Reduction
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Solution Overview
Problem
Liquid crystal display devices using Field Sequential Color (FSC) technology suffer from color shift phenomena due to long liquid crystal response times, with existing solutions being inefficient and increasing the cost and complexity of the display device.
Innovation Solution
A method that partitions the backlight and converts primary color gray-scale data into multiple colors, including a color different from the primary colors, to present color fields in sequence, using an overdrive table to obtain gray-scale values for driving sub-pixels, thereby reducing color shift and improving display efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the response time of liquid crystals is reduced to eliminate color shift, then color accuracy is improved, but the calculation amount increases and execution speed decreases
Solution Approach 1:
The patent pre-calculates and stores overdrive lookup tables (LUTs) for different gray-scale transitions before actual display operation. During display, the system only needs to query these pre-computed tables rather than performing complex calculations in real-time, thus achieving both color accuracy through overdrive compensation and high execution speed through table lookup operations.
Solution Approach 2:
The patent prepares multiple overdrive LUTs in advance for different liquid crystal material characteristics and display conditions. These pre-prepared tables act as a buffer that compensates for liquid crystal response time variations without requiring real-time computation, thereby maintaining both color precision and processing efficiency.
2Manufacturing precision
If storage equipment with large capacity is used for calculation and storage, then color shift is eliminated, but the cost of the liquid crystal display device increases
Solution Approach 1:
The patent pre-computes overdrive compensation values and stores them in compact lookup tables during the manufacturing or initialization phase. This approach converts complex real-time calculations into simple table queries, significantly reducing the storage capacity and computational resources needed during actual display operation, thereby lowering overall device cost while maintaining color accuracy.
Solution Approach 2:
The patent uses lightweight overdrive lookup tables that can be stored in small, inexpensive memory components rather than requiring large-capacity storage equipment. These compact tables provide sufficient color correction with minimal storage requirements, making the overall system more cost-effective.
3Stability of the object's composition
If the response time of liquid crystals is extended to maintain image stability, then display stability is improved, but color shift phenomenon increases
Solution Approach 1:
The patent applies overdrive compensation through pre-computed lookup tables that anticipate and counteract the color shift that would occur due to extended liquid crystal response times. By applying compensatory gray-scale adjustments from the lookup tables, the system maintains both display stability (through adequate response time) and color accuracy (through overdrive compensation).
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 alleviates color shift, reduces storage and calculation requirements, and lowers costs while maintaining high image fluency and contrast, enhancing the overall display performance.
Implementation Method 1
liquid crystal molecules of each sub pixel are rotated accordingly under a voltage
Data Source
AI summary
A liquid crystal display device and a driving method thereof are disclosed. The method for driving the liquid crystal display device comprises the following steps: converting three primary color gray-scale data of a frame image to be displayed into multiple color gray-scale data; and driving different sub pixels according to the overdrive gray-scale values that are obtained through inquiring the overdrive table based on the multiple color gray-scale data of the frame image to be displayed according to a certain time sequence in two color fields. According to the method, the color shift phenomena of the traditional liquid crystal display device can be alleviated effectively.