Display Device Off Voltage Line Stabilizes Gate-Off Potential
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Solution Overview
Problem
Display devices face issues with luminance variations and kick-back voltage due to vertical gate lines, leading to potential stains and reduced performance.
Innovation Solution
The implementation of an off voltage line adjacent to the pixel electrode, forming constant capacitance between the pixel electrode and the off voltage line, which prevents the influence of kick-back voltage and luminance variations by ensuring stable gate-off voltage across pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vertical gate lines are used to control pixel rows, then gate signal distribution is achieved, but kick-back voltage causes luminance variations and pixel stains
Solution Approach 1:
An off-voltage line is introduced as an intermediary element between the vertical gate line and the pixel electrode. This off-voltage line serves as a mediator that provides a stable reference potential, isolating the pixel electrode from the kick-back voltage generated by the vertical gate line during signal distribution.
Solution Approach 2:
The harmful kick-back voltage effect is extracted and isolated from the pixel electrode by introducing a separate off-voltage line. The off-voltage line carries the unstable voltage away from the pixel electrode, preventing it from causing luminance variations and stains while the pixel electrode maintains its stable potential through the capacitor connection.
2Stability of the object's composition
If capacitance between pixel electrode and reference is increased to stabilize voltage, then voltage stability improves, but device complexity increases
Solution Approach 1:
The off-voltage line serves multiple functions: it provides a stable reference potential for the pixel electrode, acts as a return path for displacement currents, and maintains constant capacitance throughout the display panel. By making this single structure multi-functional, the need for additional complex voltage stabilization circuits is eliminated.
Solution Approach 2:
The capacitance value between the pixel electrode and the off-voltage line is carefully controlled and maintained constant across all pixels. By optimizing this capacitance parameter, stable voltage holding is achieved without requiring excessive capacitance that would demand overly complex structures. The capacitance is tuned to provide sufficient stabilization while maintaining practical device complexity.
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 solution effectively prevents luminance reduction and pixel stains by maintaining consistent capacitance and voltage stability, enhancing the overall performance and reliability of the display device.
Implementation Method 1
forming constant capacitance between the pixel electrode and the off voltage line
Data Source
AI summary
Provided is a display device. The display device comprises: a substrate including a display area having a plurality of pixels and a non-display area, a plurality of data lines connected to each of the plurality of pixels and extending in a first direction, a plurality of first gate lines connected to each of the plurality of pixels and extending in a second direction crossing the first direction, a plurality of second gate lines extending along the first direction from one end of the display area to a line contact portion contacting each of the plurality of first gate lines, and a plurality of off voltage lines extending in a direction opposite to the first direction from the other end of the display area opposite to one end of the display area to a periphery of the line contact portion and insulated from the plurality of second gate lines.