Black Matrix Patterns for Polarization-Free Display Panels
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Solution Overview
Problem
Current liquid crystal display panels require polarization sheets on both the light incident and emitting sides, increasing costs and causing significant light efficiency loss, with up to 50% or more loss in efficiency.
Innovation Solution
A display panel design that uses sub-pixels with a liquid crystal layer between electrodes, where black matrix patterns and openings allow collimated light to be refracted and bypass shielding when an electric field is applied, enabling gray-scale display without polarization sheets, reducing costs and light loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If polarization sheets are attached to both light incident and emitting sides, then display quality is maintained, but light efficiency loss increases up to 50% or more
Solution Approach 1:
The patent extracts and removes the polarization sheets from the display structure, replacing their function with a different mechanism. The black matrix pattern with opening and liquid crystal layer combination takes over the light modulation function previously performed by polarization sheets, eliminating the 50% or more light efficiency loss they caused.
Solution Approach 2:
The patent changes the optical parameters of the display system by using the liquid crystal layer's refractive properties instead of polarization filtering. By controlling the liquid crystal's orientation through electric fields, the system modulates light transmission through refraction rather than polarization absorption, significantly improving light efficiency while maintaining display quality.
2Reliability
If polarization sheets are attached to both light incident and emitting sides, then display quality is maintained, but production cost increases
Solution Approach 1:
The patent removes the expensive polarization sheets from the display structure and replaces their function with the black matrix pattern and liquid crystal layer combination. This extraction eliminates the need to purchase, handle, and align polarization sheets during manufacturing, thereby reducing production costs while maintaining display quality through the alternative light modulation mechanism.
Solution Approach 2:
The patent merges the light modulation function previously performed by separate polarization sheets into the existing liquid crystal display structure. The black matrix pattern with opening and liquid crystal layer work together as an integrated system to achieve gray scale display, eliminating the need for separate polarization sheet components and their associated manufacturing costs.
3Illumination intensity
If black matrix pattern with opening is used instead of polarization sheet, then light efficiency is improved, but device complexity increases
Solution Approach 1:
The patent makes the liquid crystal layer and black matrix pattern perform multiple functions: they simultaneously provide the light modulation function previously handled by polarization sheets and maintain the structural integrity of the display. This multi-functionality reduces the need for additional components, thereby limiting the increase in device complexity despite the improvement in light efficiency.
Solution Approach 2:
The patent uses a black matrix pattern with an opening (porous structure) that allows controlled light passage. This porous design enables the structure to both shield light (when needed) and transmit light (when the liquid crystal modulates it), achieving light efficiency improvement without requiring complex additional components to manage light paths.
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 allows for effective gray-scale display without polarization sheets, reducing production costs and light efficiency loss, while maintaining high display quality by adjusting the electric field to control light refraction and emission.
Implementation Method 1
the collimated light incoming from the opening is refracted by the liquid crystal layer between the first electrode and the second electrode such that at least a part of the refracted collimated light bypasses the first black matrix pattern and exits from the display panel
Implementation Method 2
in a state where an electric field is generated between the first electrode and the second electrode
Data Source
AI summary
Embodiments of the present disclosure provide a display panel and a display device. The display panel includes a plurality of sub-pixels each comprising a display unit. The display unit includes a first electrode, a second electrode and a liquid crystal layer. A first black matrix pattern is disposed at a side of the liquid crystal layer facing the first electrode and a second black matrix pattern is disposed at a side of the liquid crystal layer facing the second electrode, the second black matrix pattern having an opening therein, the first black matrix pattern being disposed at a position corresponding to the opening.