Liquid Crystal Display Panel Distributed Bragg Reflective Film
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Solution Overview
Problem
Conventional total reflective liquid crystal display panels have lower ambient light utilization and fail to display normally under darker conditions due to their limited reflectivity, which restricts their applications and requires a solution to enhance light reflectivity and protect the metal reflective layer.
Innovation Solution
The implementation of a distributed Bragg reflective film with multiple reflective film groups, each comprising sub-layers with varying refractive indices and thicknesses, is used in conjunction with a reflective pixel electrode to improve light reflectivity and ambient light utilization, while also protecting the metal reflective layer from corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If a total reflective liquid crystal display panel is used to reduce power consumption, then power consumption is reduced, but reflectivity is limited to around 10% and cannot display normally under darker ambient light
Solution Approach 1:
The patent applies composite materials by combining multiple reflective film groups with different refractive indices (silicon nitride and silicon oxide layers) to create a distributed Bragg reflective film. This composite structure achieves high reflectivity while maintaining the backlight-free design, resolving the contradiction between low power consumption and limited reflectivity.
Solution Approach 2:
The patent transitions from a single-layer reflective structure to a multi-layer distributed Bragg reflective film structure with alternating high and low refractive index layers. This dimensional change in the film structure enables significantly enhanced reflectivity without requiring backlight, thus resolving the power consumption versus reflectivity contradiction.
2Illumination intensity
If a metal reflective layer is used to improve reflectivity, then reflectivity is improved, but the metal reflective layer is prone to corrosion
Solution Approach 1:
The patent introduces an intermediary protective layer (such as ITO or ZnO) between the metal reflective layer and the external environment. This intermediary layer protects the metal from corrosion while allowing the reflective function to be maintained, thus resolving the contradiction between improved reflectivity and corrosion resistance.
Solution Approach 2:
The patent creates a composite structure combining metal reflective layer with protective transparent conductive oxide layers. This composite material approach maintains high reflectivity while providing corrosion protection, resolving the reliability issue of pure metal reflective layers.
3Illumination intensity
If a distributed Bragg reflective film with multiple reflective film groups is used to enhance reflectivity, then reflectivity is enhanced, but device complexity increases
Solution Approach 1:
The patent segments the reflective film into multiple reflective film groups, each consisting of alternating high and low refractive index sub-layers. This segmentation enables enhanced reflectivity through constructive interference while maintaining a systematic and manufacturable structure, balancing reflectivity enhancement with acceptable device complexity.
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 solution enhances the light reflectivity of total reflective liquid crystal display panels, enabling them to function under darker ambient light conditions and prevents color shift, allowing for full-color display without the need for a backlight.
Implementation Method 1
a distributed Bragg reflective film disposed on the pixel electrode. In the liquid crystal display panel of the present disclosure, the distributed Bragg reflective film includes M reflective film groups in a stack
Implementation Method 2
refractive indexes of different sub reflective layers in a same reflective film group are different. the refractive indexes of the sub reflective layers in the same reflective film group are reduced layer by layer
Implementation Method 3
a liquid crystal layer disposed between the color filter substrate and the array substrate
Data Source
AI summary
A liquid crystal display panel is provided, which includes a color filter substrate, an array substrate disposed opposite to the color filter substrate, and a liquid crystal layer disposed between the color filter substrate and the array substrate. The array substrate includes: a substrate; an array driving layer disposed on the substrate; an insulating layer disposed on the array driving layer; a pixel electrode disposed on the insulating layer and electrically connected to a thin film transistor in the array driving layer by a via hole on the insulating layer; and a distributed Bragg reflective film disposed on the pixel electrode.