Counter Electrode Shielding for Lateral Electric Field LCD Leakage
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Solution Overview
Problem
In liquid crystal displays of the lateral electric field type, uneven displaying occurs in the vicinity of the connection between a wire layer for an inspection circuit or protection circuit and a gate wire due to leakage electric fields, which existing technologies fail to adequately address, especially around high-density connection conversion parts.
Innovation Solution
A counter electrode is provided on the counter substrate, overlapping with the inspection circuit or protection circuit in the frame area and connected to the common electrode on the array substrate, ensuring the counter substrate is shielded from leakage electric fields, thus preventing uneven displaying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a shield electrode is provided on gate lead-out wires of an array substrate, then electric field shielding is improved, but the connection conversion part cannot be shielded and uneven displaying occurs in high-density areas
Solution Approach 1:
A counter electrode is introduced as an intermediary shielding element on the counter substrate, positioned to overlap with the connection conversion part. This counter electrode acts as a mediator to block electric field leakage from reaching the liquid crystal layer, thereby preventing display non-uniformity in high-density connection areas without interfering with the normal operation of inspection or protection circuits
Solution Approach 2:
The shielding approach transitions from a two-dimensional planar shield electrode on the array substrate to a three-dimensional overlapping configuration where the counter electrode on the counter substrate vertically overlaps with the connection conversion part. This dimensional change enables effective shielding of previously inaccessible connection areas
2Device complexity
If the counter substrate is provided with no counter electrode to simplify structure, then device complexity is reduced, but static electricity induces electric fields causing abnormal displaying
Solution Approach 1:
Rather than providing a complete counter electrode structure across the entire counter substrate, the invention applies a localized counter electrode only in the frame area where connection conversion parts are located. This local quality approach provides targeted shielding against static electricity interference while maintaining the simplified structure and avoiding unnecessary complexity in other areas
3Adaptability or versatility
If inspection circuits or protection circuits are disposed in the frame area, then circuit functionality is improved, but electric potential fluctuation of the second substrate causes uneven displaying
Solution Approach 1:
The invention converts the potentially harmful electric field leakage from inspection or protection circuits into a controlled situation by using the counter electrode as a shield. The counter electrode, being at a fixed potential, transforms the harmful electric field interference into a contained electric field between the wire layer and counter electrode, preventing it from affecting the liquid crystal layer and thus converting a harmful effect into a manageable condition
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 effectively suppresses uneven displaying in the display area by shielding the counter substrate from leakage electric fields, improving the display's uniformity and reducing the impact of static electricity and electric potential fluctuations.
Implementation Method 1
a counter electrode disposed in the frame area of the counter substrate and overlapped with entirety of the inspection circuit or the protection circuit in a planar view. The counter electrode is equal in electric potential to a common electrode on the array substrate
Data Source
AI summary
A liquid crystal display according to the present invention is of the lateral electric field type and includes an array substrate having a plurality of pixels arranged in a matrix state, a counter substrate disposed opposite to the array substrate, and liquid crystal enclosed between the array substrate and the counter substrate by a sealing material. The liquid crystal display has a display area for an image and a frame area surrounding the display area. The liquid crystal display further includes an inspection circuit or a protection circuit disposed in the frame area of the array substrate, and a counter electrode disposed in the frame area of the counter substrate and overlapped with entirety of the inspection circuit or the protection circuit in a planar view. The counter electrode is equal in electric potential to a common electrode of the array substrate.