Liquid Crystal Display Driving Method for Color Shift Elimination
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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 costly due to high calculation requirements and storage needs.
Innovation Solution
A method that converts primary color gray-scale data into multiple color gray-scale data, including a color different from the primary colors, and presents these in sequence, using pre-stored gray-scale data to drive sub-pixels according to the backlight color, thereby eliminating color shift while reducing storage and calculation demands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional FSC liquid crystal display devices are used, then the structure is simple and manufacturing is easy, but color shift phenomena occur due to long liquid crystal response times
Solution Approach 1:
The patent divides the display frame into multiple color fields (red, green, blue, and yellow color fields) that are displayed sequentially. Each color field is further divided into multiple sub-frames with different gray-scale data. This segmentation allows different sub-pixels to have equal response times by adjusting their respective gray-scale levels, thereby eliminating color shift while maintaining manufacturing simplicity.
Solution Approach 2:
The patent changes the gray-scale parameters of liquid crystal molecules in different sub-frames and color fields. By carefully controlling the gray-scale data for each sub-pixel group (transparent, red, green, blue sub-pixels) in different color fields, the liquid crystal response times are equalized across all sub-pixels, eliminating color shift without requiring complex hardware modifications.
2Manufacturing precision
If existing solutions to eliminate color shift are implemented, then color accuracy improves, but calculation amount increases and execution speed decreases
Solution Approach 1:
The patent pre-calculates and stores the gray-scale data for all color fields and sub-frames before actual display. The processing unit prepares the multi-color gray-scale data in advance, organizing it into first and second color fields with specific gray-scale configurations. This preliminary action eliminates the need for complex real-time calculations during display, maintaining high execution speed while achieving color shift elimination.
3Manufacturing precision
If existing solutions to eliminate color shift are implemented, then color accuracy improves, but storage capacity requirements increase and device cost increases
Solution Approach 1:
The patent extracts and utilizes the yellow color field (comprising green and red sub-pixels) as a separate component in the color field sequence. By incorporating this additional color field with specific gray-scale data, the system achieves better color balance and eliminates color shift while managing storage requirements efficiently through the structured organization of gray-scale data across multiple color fields.
4Manufacturing precision
If liquid crystal response time is increased to improve color accuracy, then color shift is reduced, but image refresh rate decreases and fluency is affected
Solution Approach 1:
The patent employs periodic display of multiple color fields (red, green, blue, yellow) in a cyclic sequence. Each color field is displayed for a specific duration with optimized gray-scale data, creating a periodic pattern that achieves equal liquid crystal response times across all sub-pixels. This periodic action maintains high image refresh rates while eliminating color shift through precise timing and gray-scale control.
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 effectively eliminates color shift, enhances image refresh rate to at least 120 Hz, reduces storage and calculation costs, and maintains image fluency by ensuring equal gray-scale response times across sub-pixels.
Implementation Method 1
liquid crystal molecules of each sub pixel are rotated accordingly under a voltage
Implementation Method 2
Due to the color filters arranged at the green sub pixels and the blue sub pixels respectively, green light transmits through the green sub pixels, and blue light transmits through the blue sub pixels
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 presenting a first color field and a second color field of the frame image in sequence, wherein when each color field is presented, different sub pixels are driven according to a color of the backlight of the color field, the multiple color gray-scale data of the frame image, and pre-stored gray-scale data. According to the method, the color shift phenomena of the traditional liquid crystal display device can be eliminated.