Transflective LCD Metal Layer Protrusion Geometry
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Solution Overview
Problem
Conventional reflection-type and transflective-type liquid crystal display devices have a reflective surface with deep dents and large tilt angles, leading to inefficient use of reflected light, as light is unlikely to reach and be reflected from these areas, resulting in poor display quality.
Innovation Solution
A liquid crystal display device with a reflection region featuring a metal layer, insulating layer, and reflective layer, where recesses and protrusions are formed in the metal layer, with the width of the protrusion's bottom surface and tilt angle optimized to ensure effective light reflection, specifically where the width satisfies the condition a ≤ 2(x+y)/tan θ, and the tilt angle is between 10° and 20°, enhancing the reflection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the reflection surface has deep dents formed by conventional manufacturing, then the manufacturing process is simple, but the reflected light is not effectively utilized and display quality deteriorates
Solution Approach 1:
The patent changes the geometric parameters of the reflection surface by controlling the width of the metal layer protrusions to satisfy a≤2(x+y)/tanθ, where this transforms the deep dents into shallow dents with tilt angles of 20 degrees or less, enabling effective light reflection while maintaining the conventional manufacturing process
Solution Approach 2:
The patent applies preliminary anti-action by pre-configuring the metal layer protrusion width before the etching process, which prevents the formation of deep dents with large tilt angles that would harm light reflection, thereby counteracting the potential harmful effect of the etching process on reflection surface quality
2Ease of manufacture
If the reflection surface has large tilt angles to match the island-like multilayer structure, then the manufacturing process is simplified, but the reflected light does not effectively reach the liquid crystal panel
Solution Approach 1:
The patent changes the physical parameter of the metal layer protrusion width to satisfy a≤2(x+y)/tanθ, which transforms the reflection surface geometry from having large tilt angles to having tilt angles of 20 degrees or less, thereby improving light reflection efficiency while maintaining compatibility with the island-like multilayer structure manufacturing process
3Productivity
If the reflective layer completely covers the metal layer including gap portions, then the manufacturing process is simple, but light cannot reach the bottoms of deep dents for effective reflection
Solution Approach 1:
The patent changes the geometric parameter of the metal layer protrusion width to satisfy a≤2(x+y)/tanθ, which transforms deep dents into shallow dents, enabling light to reach the reflection surface and be effectively reflected, thereby improving illumination intensity while maintaining the simple manufacturing process of complete reflective layer coverage
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 configuration improves the reflectivity and image quality of the liquid crystal display devices by ensuring that a greater portion of the reflective surface has a tilt of 20 degrees or less, effectively utilizing reflected light and reducing manufacturing complexity.
Implementation Method 1
a liquid crystal display device including a reflection region for reflecting incident light toward a display surface
Data Source
AI summary
A transflective-type and a reflection-type liquid crystal display device having a high reflection efficiency and a high image quality are provided. A liquid crystal display device of the present invention is a liquid crystal display device including a reflection region, wherein the reflection region includes an insulating layer, a semiconductor layer and a reflective layer formed on a metal layer having a plurality of recesses therein; a plurality of protrusions of the metal layer, each having a bottom surface, an upper surface and a slope, are formed between the plurality of recesses of the metal layer; and a width a of a bottom surface of at least one of the plurality of protrusions in the metal layer satisfies a≦2(x+y)/tan θ, where a denotes the width of the bottom surface of each of the plurality of protrusions, x a thickness between the bottom surface and the upper surface, θ a tilt angle of the slope with respect to the bottom surface, and y a total thickness of the insulating layer, the semiconductor layer and the reflective layer.