Transparent Display Lighting via Side-Mounted LED Segmentation
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Solution Overview
Problem
Existing transparent display devices suffer from poor brightness uniformity and low contrast ratios due to light attenuation and reflective issues caused by the manufacturing process of the TFT metal wire, leading to non-uniform display screens and high brightness in non-display regions.
Innovation Solution
A transparent display device with a polymer liquid crystal mixed layer between substrates and strategically positioned LED line light sources emitting light in a time division manner, along with a shading member to control light distribution and uniformity, ensuring consistent brightness across the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional light source is placed at the back of the transparent display panel, then the display can be illuminated, but the light distribution becomes non-uniform and brightness uniformity deteriorates
Solution Approach 1:
The conventional single back light source is segmented into multiple LED line light sources arranged at the sides of the display panel. This segmentation allows each light source to illuminate a specific region, and through coordinated control, achieves uniform overall illumination while simplifying the positioning structure compared to complex backlight units.
Solution Approach 2:
The light source arrangement transitions from a single back-positioned source (one-dimensional illumination) to side-positioned LED line sources (two-dimensional illumination distribution). This dimensional change enables more uniform light distribution across the display panel by illuminating from multiple sides simultaneously.
2Ease of manufacture
If TFT metal wire manufacturing process is used, then the display can be constructed, but reflective issues occur leading to low contrast ratio
Solution Approach 1:
A polymer liquid crystal mixed layer is introduced as an intermediary between the TFT metal wire layer and the light source/display regions. This layer reduces the reflective impact of the metal wires on light transmission and display quality, thereby improving contrast ratio while maintaining the existing TFT manufacturing process.
Solution Approach 2:
The optical parameters of the display system are changed by introducing the polymer liquid crystal mixed layer, which modifies the interaction between light and the TFT metal wire structure. This parameter change reduces unwanted reflections and improves contrast without requiring changes to the TFT fabrication process.
3Illumination intensity
If LED line light sources are positioned at the sides with orthographic projections outside the substrate, then brightness uniformity is improved, but the device structure becomes more complex
Solution Approach 1:
The LED line light sources are merged with the side edges of the display panel structure, with their orthographic projections positioned outside but aligned with the panel boundaries. This merging approach achieves uniform illumination while minimizing the increase in overall device dimensions by efficiently utilizing the side space.
4Illumination intensity
If a shading member is added to control light distribution, then brightness uniformity improves, but the device complexity increases
Solution Approach 1:
The shading member is designed with locally varied properties to control light distribution in different regions of the display panel. By adjusting the shading characteristics in specific areas rather than using a uniform structure, the patent achieves improved brightness uniformity while keeping the overall structure relatively simple.
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 brightness uniformity and contrast ratio by directing light uniformly across the display panel, maintaining transparency and allowing users to see both the display and the background clearly, while the drive control circuit synchronizes refresh frequencies for optimal field sequential color display.
Implementation Method 1
a polymer liquid crystal mixed layer, located between the first substrate and the second substrate
Implementation Method 2
at least one full color light source, located at a side of the first substrate distal to the second substrate... configured to emit light of at least two colors toward the transparent display panel in a time division manner
Data Source
AI summary
The present disclosure provides a transparent display device, including a transparent display panel and at least one full color light source. The transparent display panel includes a first substrate and a second substrate provided opposite to each other, and a polymer liquid crystal mixed layer located therebetween. The light source is located at a side of the first substrate distal to the second substrate, and an orthographic projection of the light source on a plane where the first substrate is located is outside the first substrate. The light source is configured to emit light of at least two colors toward the transparent display panel in a time division manner.