Liquid Crystal Display Transparent Region Luminance Control
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Solution Overview
Problem
Liquid crystal display devices face challenges in improving luminance without adding a white pixel, as existing solutions result in reduced luminance due to light absorption by color filters and require additional driving circuits for white pixels.
Innovation Solution
The implementation of a liquid crystal display device with a first, second, and third color pixel area, each featuring a color filter, and a transparent region within the first color pixel area that allows all wavelengths of light to pass through, enhancing luminance without the need for a white pixel, and utilizing different data voltages for subpixel electrodes to control light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a white pixel is added to compensate for luminance loss, then luminance is improved, but device complexity increases due to additional driving circuits
Solution Approach 1:
The pixel area is segmented into a color pixel region with a color filter and a transparent region without a color filter. This segmentation allows the transparent region to function as a white pixel for luminance compensation while sharing the same substrate and pixel electrode infrastructure, thereby avoiding the need for separate driving circuits.
Solution Approach 2:
The transparent region within the color pixel area serves multiple functions: it acts as a white pixel for luminance compensation while being integrated into the existing pixel structure. This multi-functionality eliminates the need for a completely separate white pixel with its own driving circuit, thus reducing device complexity.
2Ease of manufacture
If color filters are used in all pixel areas, then color display is achieved, but luminance is reduced due to light absorption
Solution Approach 1:
Different regions of the pixel area have different properties: the color pixel region contains a color filter for color display, while the transparent region lacks a color filter to allow maximum light transmission. This local differentiation enables both color display capability and luminance compensation within the same pixel structure.
Solution Approach 2:
Instead of applying color filters to the entire pixel area, color filters are applied only to the necessary color pixel regions. The transparent region is deliberately left without a color filter to provide excessive light transmission for luminance compensation, accepting that not all regions need color filtering.
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 improves luminance by allowing white light to pass through the transparent region, simplifies the driving circuit, and enables precise color display by adjusting color filters in each pixel area, thereby enhancing both brightness and color accuracy.
Implementation Method 1
generating an electric field on a liquid crystal layer by applying a voltage to the field generating electrodes, determining alignment directions of liquid crystal molecules of the liquid crystal layer using the generated field
Implementation Method 2
While the light supplied from the light source passes through a color filter, some wavelengths of light are absorbed into the color filter, generating loss of a light amount
Implementation Method 3
controlling polarization of incident light
Data Source
AI summary
A liquid crystal display device that allows efficient luminance control is presented. The device includes: first, second, and third color pixel areas; a first substrate and a second substrate; a first color filter disposed in the first color pixel area on the first substrate or the second substrate; a second color filter disposed in the second color pixel area on the first substrate or the second substrate; a third color filter disposed in the third color pixel area on the first substrate or the second substrate; and a liquid crystal layer disposed between the first substrate and the second substrate, wherein the first color pixel area includes a first transparent region at which the first color filter is not disposed, and a ratio of the first transparent region of the first color pixel area to the first color pixel area is in a range of 1/1000 to 1/2, inclusive.