Transflective Display White Balance via Filter Area Proportion
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Solution Overview
Problem
Transflective liquid crystal display devices face challenges in maintaining consistent white balance between transmissive and reflective displays due to limited color reproduction range and differences in light sources, particularly when using four or more filters with different colors, which affects the display's ability to accurately represent colors across various environments.
Innovation Solution
The solution involves arranging four or more filters with different colors in a pixel, where at least two filters have varying proportions of the reflective region, allowing for adjustment of the white balance in the reflective display by modifying the area proportion of the reflective region, and optimizing the backlight's color temperature for the transmissive display to minimize differences in white balance between the two modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If four or more filters with different colors are used to extend color reproduction range, then color reproduction range is improved, but white balance consistency between transmissive and reflective displays deteriorates
Solution Approach 1:
The patent applies local quality by assigning different reflective region proportions to different color filters (sub-pixels) within the same pixel. Specifically, the red, green, blue, and yellow filters have different reflective region area proportions, allowing each color channel to be independently optimized for both transmissive and reflective display modes, thereby maintaining white balance consistency while using four or more color filters
Solution Approach 2:
The patent changes the parameter of reflective region area proportion for each color filter to resolve the white balance inconsistency. By adjusting the reflective region area proportion differently for red, green, blue, and yellow filters, the patent optimizes the reflective display white balance while maintaining transmissive display performance, thus resolving the contradiction between extended color reproduction and white balance consistency
2Reliability
If the reflective region area proportion is adjusted for white balance optimization, then white balance consistency is improved, but device complexity increases
Solution Approach 1:
The patent implements local quality by differentiating the reflective region proportions only at the sub-pixel level within existing color filter arrays. This approach integrates seamlessly into conventional display manufacturing processes without requiring complex additional components or structures, thus minimizing the increase in device complexity while achieving white balance optimization
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 configuration extends the color reproduction range and reduces the difference in white balance between transmissive and reflective displays, resulting in improved display quality with consistent color representation across different lighting conditions.
Implementation Method 1
In the transmissive region, light from the backlight passes through a liquid crystal layer and a color filter only one time and then the light is emitted to the outside. In the reflective region, surrounding light passes through the color filter and the liquid crystal layer, and the light is reflected by a reflective member
Implementation Method 2
the liquid crystal panel has two different display regions: a reflective region; and a transmissive region
Data Source
AI summary
The present invention provides a transflective display device capable of extending a color reproduction range and reducing a difference in white balance between transmissive display and reflective display. The display device of the present invention is a transflective display device including four or more filters having different colors in a pixel, each of the four or more filters having different colors including: a transmissive region for displaying an image by transmitting light from a backlight; and a reflective region for displaying an image by reflecting surrounding light, wherein at least two of the four or more filters having different colors are different in a proportion of an area of the reflective region, and the proportion of the area is represented by the following formula (1):Proportion of area of reflective region=Area of reflective region/Effective area of filter (1).