Transparent Display Panel Blue Phase Liquid Crystal Light Extraction
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Solution Overview
Problem
Existing liquid crystal display panels have low overall light efficiency due to the use of upper and lower polarizer sheets, which restrict light extraction and result in poor display effects, as they can only modulate one type of polarized light.
Innovation Solution
A transparent display panel design featuring a color filter substrate, a blue phase liquid crystal layer, and a light guide plate, where the blue phase liquid crystal layer is modulated by an electrode layer to diffract collimated natural light through a liquid crystal grating, allowing for the modulation of two types of polarized light without polarizer sheets, thereby increasing light extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If upper and lower polarizer sheets are used in the liquid crystal display panel, then the liquid crystal layer can modulate polarized light, but the overall light transmissivity decreases and light extraction efficiency is limited
Solution Approach 1:
The patent removes the upper and lower polarizer sheets from the traditional liquid crystal display structure. By extracting these light-blocking components, the invention achieves high light transmissivity while maintaining display functionality through an alternative mechanism (blue phase liquid crystal with light shielding parts and opening regions) that does not require polarized light modulation.
2Ease of manufacture
If polarizer sheets are used to modulate light, then light modulation is achieved, but the display effect deteriorates due to low light extraction efficiency
Solution Approach 1:
The invention extracts and removes the polarizer sheets that limit light extraction efficiency. The display effect is maintained through a different approach: using blue phase liquid crystal combined with strategically positioned light shielding parts and opening regions that allow direct light transmission without the need for polarized light modulation.
Solution Approach 2:
The patent applies local quality by creating opening regions in the light shielding parts at specific pixel locations. These opening regions allow light to pass through selectively, creating the display image. The light shielding parts block light in other areas, providing local control over light transmission to achieve the desired display effect without polarizers.
3Ease of manufacture
If traditional liquid crystal display structure with polarizer sheets is used, then light modulation is possible, but the overall light efficiency remains low
Solution Approach 1:
The invention extracts and eliminates the polarizer sheets that cause light loss. By removing these components, the system achieves significantly higher overall light efficiency while maintaining the ability to modulate light for display purposes through the blue phase liquid crystal and opening region structure.
Solution Approach 2:
The blue phase liquid crystal layer, when subjected to an electric field, self-organizes into a grating structure that automatically provides the necessary light modulation function. This self-organizing capability eliminates the need for external polarizer sheets, thereby improving overall light efficiency while maintaining display functionality.
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 design enhances overall light transmissivity and display effect by modulating both polarized light components, eliminating the need for polarizer sheets and improving light extraction efficiency compared to traditional liquid crystal display panels.
Implementation Method 1
the blue phase liquid crystal receives different driving voltages at different positions in one of grating periods of the liquid crystal grating, so that the collimated natural light is diffracted by the liquid crystal grating and exits through the opening region
Data Source
AI summary
A transparent display panel and a transparent display device are disclosed. The transparent display panel comprises a color filter substrate, an electrode layer, a blue phase liquid crystal layer configured to modulate an incident collimated natural light, and a light guide plate. The color filter substrate comprises a black matrix and pixel regions which are surrounded by the black matrix and arranged in a matrix, and each of the pixel regions on the color filter substrate is provided with a light shielding part at a central position, and an opening region surrounded by the light shielding part and the black matrix. The light guide plate is provided with a light exit region on a side close to the blue phase liquid crystal layer, the light exit region is arranged to correspond to the light shielding part in position, and in case the electrode layer does not apply a driving voltage to the blue phase liquid crystal layer, the collimated natural light which passes through the light exit region is incident on the light shielding part and is blocked by the light shielding part. The electrode layer is configured to apply the driving voltage to the blue phase liquid crystal layer to form a liquid crystal grating, and the blue phase liquid crystal receives different driving voltages at different positions in one of grating periods of the liquid crystal grating, so that the collimated natural light is diffracted by the liquid crystal grating and exits through the opening region.