Dual-Panel Display Module Transmittance Contradiction
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Solution Overview
Problem
Conventional dual-panel display modules have relatively low transmittance, which limits their energy efficiency and image quality despite providing high contrast through local dimming technology.
Innovation Solution
A display module comprising a first horizontal-electric-field-type liquid crystal display sub-panel with a color filter for normal color display and a second vertical-electric-field-type liquid crystal display sub-panel for grayscale images, where the second sub-panel has a Twisted Nematic (TN) mode with Pixels Per Inch (PPI) less than or equal to 150, and polarizers are arranged to optimize transmittance and viewing angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional dual-panel display module is used to achieve high contrast through local dimming, then contrast ratio is improved, but transmittance deteriorates
Solution Approach 1:
The display module is divided into two separate display sub-panels: a first display sub-panel with a color filter layer for color display, and a second display sub-panel without a color filter layer for grayscale display and local dimming control. This segmentation allows each sub-panel to be optimized for its specific function, with the second sub-panel achieving high transmittance for energy efficiency while the first sub-panel provides color filtering, thereby resolving the contradiction between high contrast and high transmittance
Solution Approach 2:
The second display sub-panel is specifically designed without a color filter layer to achieve high transmittance characteristics, while the first display sub-panel includes the color filter layer for color display. This local quality differentiation allows the grayscale sub-panel to maximize light transmission for energy efficiency while the color sub-panel handles color rendering, simultaneously achieving both high transmittance and high contrast ratio
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 solution significantly increases transmittance while maintaining high contrast, enhancing energy efficiency and image quality by leveraging the higher transmittance of vertical-electric-field-type liquid crystal display panels and optimizing polarizer configurations.
Implementation Method 1
the second display sub-panel is a vertical-electric-field-type liquid crystal display panel
Implementation Method 2
polarizers are arranged to optimize transmittance and viewing angle
Data Source
AI summary
The present disclosure relates to the field of display technology, and provides a display module and a display device. The display module includes a first display sub-panel, where the first display sub-panel includes: a first display sub-panel including a plurality of first pixel units; and a second display sub-panel arranged at a light-entering side of the first display sub-panel and including a plurality of second pixel units. Each second pixel unit corresponds to at least one first pixel unit, an orthogonal projection of each second pixel unit onto the first display sub-panel coincides with the corresponding first pixel unit, and the second display sub-panel is a vertical-electric-field-type liquid crystal display panel.