Rollable Display Panel with Integrated Light Guide and Source
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Solution Overview
Problem
Reflective display panels face issues with insufficient brightness, reduced contrast, and color saturation variations under inadequate ambient light or uncoordinated hues, leading to suboptimal display performance.
Innovation Solution
Incorporating a built-in light source and a light guide layer with phase difference delay characteristics into the display panel, which includes a polarizing layer and microstructure layer, to enhance light emission and adjust polarization for improved viewing conditions, while also serving as a package cover for a thinner and lighter design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a reflective display panel is used to achieve paper-like reading experience and avoid visual fatigue, then user comfort is improved, but display brightness and contrast deteriorate under inadequate ambient light
Solution Approach 1:
The patent combines a reflective display structure with a light guide layer and light source structure into an integrated display panel. The light guide layer is embedded within the substrate structure, merging the functions of substrate support and light guidance, while the light source is positioned to work in conjunction with the reflective surface, creating a hybrid display system that maintains the reflective display's eye-comfort benefits while adding active illumination capability to overcome insufficient ambient light conditions
Solution Approach 2:
The light guide layer acts as an intermediary component between the light source and the display surface. It receives light from the light source and distributes it uniformly across the display area, mediating the interaction between the added light source and the reflective display structure to achieve improved brightness without compromising the reflective display's fundamental characteristics
2Illumination intensity
If a built-in light source and light guide layer are added to improve display brightness, then illumination intensity is improved, but device complexity increases
Solution Approach 1:
The light guide layer is integrated within the substrate structure rather than being added as a separate external component. The substrate serves dual functions as both the structural support and the light guide medium, merging these two functions into a single component to reduce overall device complexity while still achieving improved brightness
Solution Approach 2:
The substrate is designed to serve multiple functions simultaneously: it provides structural support for the display panel, acts as the light guide layer for light distribution, and serves as part of the overall display structure. This multi-functionality reduces the number of separate components needed, thereby reducing device complexity while achieving the brightness improvement goal
3Ease of manufacture
If the second substrate serves as both package cover and light guide layer to simplify manufacturing, then ease of manufacture is improved, but functional precision may deteriorate
Solution Approach 1:
The patent specifies precise parameter ranges for the light guide layer's optical properties, including out-plane optical phase delay value (Rth) and in-plane optical phase delay value (Ro) both being more than 0 and less than or equal to 1/2 wavelength. By defining these parameter ranges, the patent ensures that even though the substrate serves dual functions, the optical precision requirements are met through controlled material selection and manufacturing parameters
Solution Approach 2:
The patent applies different optical property requirements to different aspects of the substrate. The substrate needs to provide adequate mechanical protection as a package cover while simultaneously achieving specific optical phase delay characteristics for light guidance. By specifying local optical properties (Rth and Ro values) for the light guide function while maintaining overall structural integrity, the patent balances manufacturing simplicity with functional precision
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 ensures consistent display quality by supplementing ambient light, adjusting polarization for better viewing, and simplifying manufacturing with a dual-function substrate, resulting in enhanced brightness, contrast, and color saturation.
Implementation Method 1
The light guide layer includes a phase difference delay characteristic, wherein an out-plane optical phase delay value (Rth) and an in-plane optical phase delay value (Ro) of the light guide layer are more than 0 and less than or equal to 1⁄2 wavelength
Implementation Method 2
after the light passes through the display material layer, the light passes through the polarizing layer to become a linearly polarized light
Implementation Method 3
The light source is disposed on one side of the second substrate, and the light source is configured to emit light
Implementation Method 4
The light passes through the second substrate and the color filter layer and arrives at the first substrate, and is reflected by the first substrate and enters the color filter layer
Data Source
AI summary
The present disclosure relates to a display panel. The display panel includes a first substrate, a second substrate, a display material layer, an active component layer, a color filter layer and a light source. The display material layer is disposed between the first substrate and the second substrate. The active component layer and the color filter layer are disposed between the first substrate and the display material layer. The light source is disposed on one side of the second substrate, and emits light. The light passes through the second substrate and the color filter layer and arrives at the first substrate, and is reflected by the first substrate and then enters the color filter layer. The light further passes through the color filter layer, enters the display material layer, passes through the display material layer, and is outputted to the exterior.