Ridge Pattern Conductive Bar for LCD Transmittance
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Solution Overview
Problem
Liquid crystal display (LCD) devices, particularly in the vertically aligned (VA) mode, face challenges in achieving high transmittance and lateral visibility due to the formation of dark portions between conductive bars and pixel electrodes, which affect the display's overall performance.
Innovation Solution
The implementation of a display device structure that includes a pixel electrode with adjacent conductive bars featuring ridge patterns protruding towards the pixel electrode, reducing the space between them and enhancing transmittance, along with a manufacturing mask for producing such a structure to improve the display's transmittance and lateral visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conductive bars are disposed adjacent to pixel electrodes in VA mode LCDs, then domain formation is achieved, but dark portions are formed between them reducing transmittance
Solution Approach 1:
The conductive bar includes a ridge pattern that protrudes toward the pixel electrode, creating a curved or elevated surface profile. This curvature reduces the gap distance between the conductive bar and pixel electrode, minimizing the formation of dark portions while preserving domain structure. The ridge pattern effectively transforms a flat surface into a three-dimensional profile that improves light transmission.
Solution Approach 2:
The invention changes the geometric parameters of the conductive bar by adding a ridge pattern with specific dimensions. The ridge pattern has a predetermined height and width that optimizes the balance between maintaining domain formation and reducing dark portions. By adjusting these parameters, the transmittance is improved without compromising the domain structure necessary for VA mode operation.
2Ease of manufacture
If conventional conductive bar structures are used, then manufacturing is simplified, but lateral visibility and color accuracy deteriorate due to color distortion
Solution Approach 1:
The ridge pattern on the conductive bar creates a curved surface that improves lateral visibility by reducing color distortion. The three-dimensional profile of the ridge pattern helps to minimize the formation of dark portions and improves light transmission uniformity across different viewing angles, thereby enhancing color accuracy without complicating the manufacturing process.
Solution Approach 2:
The ridge pattern is disposed at specific locations on the conductive bar, creating local variations in surface properties. This local quality enhancement targets the areas where dark portions form most significantly, improving lateral visibility and color accuracy in critical regions while maintaining manufacturing simplicity through a relatively straightforward structural modification.
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 enhances transmittance by minimizing dark portions and improves lateral visibility by reducing color distortion, resulting in a more effective and visually appealing display.
Implementation Method 1
controlling fringe fields formed at edges of a pixel electrode
Implementation Method 2
voltages are applied to field generating electrodes to generate an electric field in an optical medium layer such as a liquid crystal layer. Accordingly, directions of liquid crystal molecules of the liquid crystal layer are determined, and polarization of incident light is controlled by the directions of the liquid crystal molecules
Data Source
AI summary
A display device includes a base substrate; a pixel electrode on the base substrate; a first conductive bar which is adjacent to and separated from a first edge of the pixel electrode in a top plan view, the first conductive bar disposed in a same layer as the pixel electrode; and a common electrode which overlaps the pixel electrode. In the top plan view, the first conductive bar includes: a first body which lengthwise extends along the first edge of the pixel electrode and includes an edge which faces the first edge of the pixel electrode, and a first ridge pattern and a second ridge pattern each protruding from the edge of the first body and toward the pixel electrode, the first and second ridge patterns consecutively disposed along a lengthwise direction of the first body.