Transflective Display Panel Viewing Angle Expansion
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Solution Overview
Problem
Conventional transflective liquid crystal display panels have a narrow viewing angle, limiting their usability under varying ambient light conditions, as they provide clear content viewing only within ±30° from the normal display direction due to low transmissivity beyond this range.
Innovation Solution
A transflective display panel design featuring a reflective region with a specular reflection layer on the array substrate and a diffuse reflection layer on the color film substrate, both with smooth surfaces and oppositely disposed, along with nano-titanium dioxide particles in the diffuse reflection layer to enhance light reflection and maintain even liquid crystal alignment, increasing the viewing angle to ±60°.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional reflection plate with specular reflection is used, then the display brightness is maintained, but the viewing angle is limited to ±30°
Solution Approach 1:
The reflection function is segmented into two distinct layers: a first reflection layer (specular reflection) and a second reflection layer (diffuse reflection). This segmentation allows each layer to perform its specific function - the first layer maintains brightness while the second layer expands the viewing angle, resolving the contradiction between brightness maintenance and viewing angle expansion.
Solution Approach 2:
The invention uses a composite reflection structure combining specular reflection material (first reflection layer) and diffuse reflection material (second reflection layer with nano-particles). This composite approach integrates the advantages of both reflection types - the specular layer provides high brightness and the diffuse layer provides wide viewing angle - thereby resolving the technical contradiction.
2Adaptability or versatility
If the viewing angle is expanded beyond ±30°, then the adaptability improves, but the equivalent transmissivity decreases below 30%
Solution Approach 1:
The reflection function is segmented into two distinct layers: a first reflection layer (specular reflection) and a second reflection layer (diffuse reflection). This segmentation allows each layer to perform its specific function - the first layer maintains brightness while the second layer expands the viewing angle, resolving the contradiction between brightness maintenance and viewing angle expansion.
Solution Approach 2:
The invention uses a composite reflection structure combining specular reflection material (first reflection layer) and diffuse reflection material (second reflection layer with nano-particles). This composite approach integrates the advantages of both reflection types - the specular layer provides high brightness and the diffuse layer provides wide viewing angle - thereby resolving the technical contradiction.
3Adaptability or versatility
If a diffuse reflection layer with nano-particles is added, then the viewing angle expands to ±60°, but the device complexity increases
Solution Approach 1:
The diffuse reflection layer is applied locally only in the reflective region of the pixel unit, not across the entire display surface. This localized application minimizes the added complexity while achieving the viewing angle expansion where needed most - in the reflective region where ambient light utilization is required.
Solution Approach 2:
The invention uses a composite reflection structure combining specular reflection material (first reflection layer) and diffuse reflection material (second reflection layer with nano-particles). This composite approach integrates the advantages of both reflection types - the specular layer provides high brightness and the diffuse layer provides wide viewing angle - thereby resolving the technical contradiction.
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 design significantly expands the viewing angle to ±60°, ensuring clear content visibility and improved display effectiveness across a wider range of angles, while maintaining high brightness and even liquid crystal alignment.
Implementation Method 1
A reflection plate and a pad layer are disposed under the liquid crystal layer of the reflection region. As shown in FIG. 1, specular reflection as indicated by the arrows in the reflective region will occur as the surface of the reflection plate is a reflection layer made of a layer of aluminum.
Implementation Method 2
a diffuse reflection layer disposed on a side of the color film substrate that is close to the liquid crystal layer, the diffuse reflection layer and the first reflection layer disposed to be opposite to each other
Implementation Method 3
the diffuse reflection layer comprises a base and nano-particles dispersed in the base. In an example, the nano-particles are nano titanium dioxide particles.
Data Source
AI summary
A transflective display panel, a method for fabricating the same and a display device are provided. The transflective display panel comprises an array substrate and a color film substrate cell-assembled with each other and a liquid crystal layer sandwiched between the array substrate and the color film substrate. A plurality of pixel units correspondingly formed on the array substrate and the color film substrate. Each pixel unit comprises a reflective region and a transmissive region. Disposed inside the reflective region are a first reflection layer disposed on the side of the array substrate that is close to the liquid crystal layer and a diffuse reflection layer disposed on the side of the color film substrate that is close to the liquid crystal layer. The diffuse reflection layer and the first reflection layer are disposed opposite each other.