Display Panel Light Control via Substrate Regions
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Solution Overview
Problem
Existing LCD panels have a large number of optical film layers, leading to thickness and cost issues, and are unable to display pure black due to backlight bleeding, which affects contrast.
Innovation Solution
A display panel design featuring a color-film substrate, an array substrate, and a liquid-crystal layer with a backlight module that provides collimated lights, where pixel units have specific transmission and non-transmission regions to control light passage, allowing for improved contrast without the need for upper and lower polarizers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If traditional LCD panel uses two polarizers with liquid-crystal layer to control light, then pixel units can display different brightness and colors, but the panel has relatively large number of optical film layers, is relatively thick, and cannot display pure black due to backlight bleeding
Solution Approach 1:
The patent removes one or more polarizers from the traditional LCD structure, extracting the light control function to the array substrate side only. This extraction reduces the number of optical film layers while maintaining the light modulation capability, directly addressing the contradiction between contrast improvement and device complexity reduction.
Solution Approach 2:
The patent introduces a new dimensional approach by creating transmission and non-transmission regions directly on the array substrate plane, rather than using multiple stacked polarizer layers. This dimensional reorganization allows for simpler structure while achieving the same light control function, resolving the contradiction between fewer optical layers and maintaining display performance.
2Illumination intensity
If LCD panel uses laminated structure to improve contrast, then contrast is improved, but the panel has low light transmittance, is thick, has poor reliability, high cost, and high requirement for backlight brightness
Solution Approach 1:
The patent extracts the light control function from multiple stacked polarizer layers and consolidates it into the array substrate structure. This extraction eliminates the need for laminated structures, directly reducing panel thickness while maintaining contrast improvement through the transmission/non-transmission region design.
Solution Approach 2:
The patent merges the light control function that was previously distributed across multiple polarizer layers into a single integrated structure on the array substrate. This consolidation reduces the overall panel thickness by eliminating redundant layers while achieving the same contrast enhancement effect.
3Illumination intensity
If LCD panel uses Mini LED backlight to improve contrast, then contrast is improved, but the cost of Mini LED is relatively high, and without fine partitioning, pure black display is still impossible
Solution Approach 1:
The patent segments the array substrate into multiple transmission and non-transmission regions corresponding to different pixel units. This segmentation allows each pixel to independently control light passage, enabling pure black display without requiring complex Mini LED backlight partitioning, thus reducing overall device complexity while maintaining high contrast.
Solution Approach 2:
The patent introduces transmission and non-transmission regions on the array substrate as an intermediary mechanism between the backlight and the liquid crystal layer. This intermediary structure enables precise light control at the pixel level, achieving pure black display without the need for expensive and complex Mini LED backlight systems.
4Illumination intensity
If LCD panel uses transmission and non-transmission regions on color-film and array substrates, then light leakage is prevented and contrast is improved, but the structure becomes more complex
Solution Approach 1:
The patent combines the light control function into the existing substrate structures (color-film substrate and array substrate) by creating transmission and non-transmission regions directly on them. This merging approach integrates light control into the substrate fabrication process rather than adding separate components, thus minimizing the increase in device complexity while achieving improved contrast.
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 enhances contrast by preventing light leakage during non-transmission modes and simplifies the panel structure, while using a Mini Light Emitting Diode backlight module for efficient light management.
Implementation Method 1
the liquid-crystal layer corresponding to the pixel unit is configured to transmit the collimated lights
Implementation Method 2
the liquid-crystal layer corresponding to the pixel unit is configured to scatter the collimated lights
Implementation Method 3
the first non-transmission region is configured to prevent collimated lights passing through the second transmission region and the liquid-crystal layer from exiting from the color-film substrate
Implementation Method 4
The backlight module includes a Mini Light Emitting Diode (LDE) light-source plate
Data Source
AI summary
A display panel and a display device are provided. The display panel includes a color-film substrate, an array substrate, a liquid-crystal layer, and a backlight module configured to provide collimated lights. The display panel includes multiple pixel units. The color-film substrate corresponding to each pixel unit has a first transmission region which transmits lights and a first non-transmission region which does not transmit lights. The array substrate corresponding to each pixel unit has a second transmission region which transmits lights and a second non-transmission region which does not transmit lights. An orthographic projection of the first non-transmission region on the array substrate completely covers the second transmission region. When the pixel unit works in a non-transmission mode, the liquid-crystal layer corresponding to the pixel unit is configured to transmit the collimated lights, and the first non-transmission region is configured to prevent the collimated lights from exiting from the color-film substrate.