Dual-Panel LCD Light Leakage Reduction via Pixel Area Segmentation
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Solution Overview
Problem
In liquid crystal display devices with overlapping display panels, monochrome image color reproducibility is degraded due to light leakage from off-state pixels, particularly in low-luminance images, as the existing technologies fail to effectively manage light transmission and leakage between color and black-and-white image panels.
Innovation Solution
The liquid crystal display device configuration includes a first display panel for color images and a second display panel for black-and-white images, with specific pixel arrangements and overlapping areas to minimize light leakage, where the second panel's pixels overlap corresponding pixels on the first panel, allowing independent control of on and off states to reduce color contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a monochrome image is displayed on a color image display panel, then the device structure is simplified, but color reproducibility is degraded due to light leakage from off-state pixels
Solution Approach 1:
The invention divides the display device into two separate display panels: a color image display panel and a monochrome image display panel. This segmentation allows each panel to be optimized for its specific function, preventing light leakage from off-state pixels on the color panel when displaying monochrome images.
Solution Approach 2:
The invention introduces a monochrome image display panel as an intermediary layer between the backlight and the color image display panel. This intermediary panel selectively transmits or blocks light to prevent unwanted light leakage from the color panel's off-state pixels, thereby improving color reproducibility.
2Illumination intensity
If two display panels overlap each other to improve contrast, then contrast is improved, but light leakage from off-state pixels still degrades color reproducibility of monochrome images
Solution Approach 1:
The invention applies different optical properties to different regions of the display system. The monochrome image display panel has specific light transmission characteristics that allow it to selectively control light passage, creating local quality differences that prevent light leakage while maintaining contrast enhancement.
Solution Approach 2:
The invention enables dynamic control of light transmission by independently controlling the display content on each panel. The monochrome panel can dynamically adjust its light transmission properties based on the displayed image, allowing it to block light from off-state color pixels only when necessary while maintaining contrast improvement.
3Ease of manufacture
If one pixel of monochrome panel corresponds to three pixels of color panel, then the number of source drivers is reduced for cost reduction, but light leakage from adjacent color pixels affects monochrome image quality
Solution Approach 1:
The invention merges multiple color pixels (red, green, blue) under a single monochrome pixel region, allowing them to be controlled by a single source driver. This merging reduces the number of source drivers needed while the overlapping panel structure prevents light leakage from affecting image quality.
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 enhances color reproducibility by reducing light leakage and allows for a decrease in the number of source drivers, thereby reducing costs and improving image quality, especially for low-luminance monochrome images.
Implementation Method 1
a color filter layer that transmits light having a specific color
Implementation Method 2
a liquid crystal layer that is disposed between the two substrates and includes a plurality of liquid crystal drops
Data Source
AI summary
A liquid crystal display device includes: a first display panel displaying a color image, and a second display panel displaying a black-and-white image. The first display panel includes a first pixel corresponding to a first transmission area transmitting light having first color, a second pixel corresponding to a second transmission area transmitting light having second color, and a third pixel corresponding to a third transmission area transmitting light having third color. The second display panel includes a fourth pixel overlapping the first pixel, and a fifth pixel overlapping the second pixel and the third pixel. An area of the fourth pixel is different from an area of the fifth pixel.