Gate Line Shielding for Display Light Leakage Reduction
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Solution Overview
Problem
Display devices, such as LCDs, face issues with light leakage and low aperture ratio, which affect efficiency and image quality due to the design of field generation electrodes and signal lines.
Innovation Solution
The proposed display device incorporates a conductive shield portion on the gate line, overlapping one edge, and a reference voltage line with extensions, along with transistors and data lines, to manage voltage distribution and reduce capacitive coupling between data lines and sub-pixel electrodes, thereby preventing light leakage and enhancing aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the gate line and data line are arranged in a conventional configuration without additional shielding structures, then the device complexity is low, but light leakage occurs due to electric field interference between the gate line and sub-pixel electrodes
Solution Approach 1:
A conductive shield portion is introduced as an intermediary element between the gate line and the sub-pixel electrodes. This shield portion, connected to the gate line at a specific position, acts as a mediator to redirect electric field lines and prevent direct interference with the pixel electrodes, thereby eliminating light leakage without requiring complete restructuring of the display device
Solution Approach 2:
The gate line is extended in the second direction (perpendicular to the first direction of the display panel) to form a shield portion that protrudes beyond the pixel region. This dimensional extension creates a three-dimensional shielding structure that blocks electric field interference in the vertical dimension, preventing light leakage without increasing the horizontal footprint of the device
2Use of energy by moving object
If the aperture ratio is increased by reducing the area of field generation electrodes and signal lines, then the light transmission efficiency improves, but electric field interference and light leakage worsen
Solution Approach 1:
The gate line is designed with non-uniform dimensions: in the pixel region, it maintains minimal width to reduce interference and maximize aperture ratio, while in the shield region, it extends beyond the pixel boundaries to provide electromagnetic shielding. This local variation in geometry allows the same structure to serve dual purposes: minimizing interference in the display area while providing protection at the boundaries
Solution Approach 2:
The extended shield portion of the gate line serves as an intermediary that captures and redirects electric field lines away from the pixel electrodes. By providing this intermediate shielding structure, the design allows for minimal electrode and signal line dimensions in the pixel region (maximizing aperture ratio) while still protecting against electric field interference through the extended shield
3Object-affected harmful factors
If the gate line is extended beyond the pixel region to provide shielding, then light leakage is prevented, but the area occupied by the gate line increases
Solution Approach 1:
The gate line extension utilizes the second direction (vertical dimension perpendicular to the display panel surface) rather than expanding in the first direction (horizontal plane). By extending the gate line to protrude above or below the pixel region in the vertical dimension, the design provides shielding without increasing the horizontal footprint, thus preventing light leakage while minimizing the area occupied on the display surface
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 reduces light leakage and increases the aperture ratio, improving the efficiency and optical characteristics of the display device by shielding electric fields and optimizing voltage distribution across the display panel.
Implementation Method 1
a conductive shield portion disposed on the gate line, wherein the gate line includes two parallel edges, an edge closer to the reference voltage line among the two parallel edges including a first edge, and wherein the conductive shield portion overlaps the first edge
Implementation Method 2
When a voltage is applied to the field generation electrode, an electric field is generated in the liquid crystal layer and thus liquid crystals are realigned, and accordingly, a desired image can be displayed by adjusting the amount of transmitted light
Implementation Method 3
a capacitor having: a first electrode connected to the pixel electrode; and a second electrode connected to the common electrode
Data Source
AI summary
A display device includes: a substrate; a gate line disposed on the substrate and configured to transmit a gate signal; a reference voltage line disposed apart from the gate line and configured to transmit a reference voltage; an insulation layer disposed on the gate line and the reference voltage line; a pixel electrode layer including: a first sub-pixel electrode disposed on the insulation layer and located at a first side with reference to the gate line; and a second sub-pixel electrode disposed on the insulation layer and located at a second side opposite to the first side with reference to the gate line; and a conductive shield portion disposed on the gate line, wherein the gate line includes two parallel edges, an edge closer to the reference voltage line among the two parallel edges including a first edge, and wherein the conductive shield portion overlaps the first edge.