Array Substrate Signal Line Layout for Accurate PWM Dimming
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Solution Overview
Problem
The luminous efficiency of light-emitting devices in display apparatuses decreases under low current density conditions, and existing PWM dimming methods suffer from low accuracy and signal interference in pixel circuits.
Innovation Solution
The array substrate includes independently controlled first and second light-emitting control signal lines for the transistors, located in different conductive layers and insulated from each other, allowing for flexible control of PWM signals with different phases and reduced signal interference, enhancing dimming accuracy and pixel density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single light-emitting control signal line is used for both light-emitting control transistors, then the device complexity is reduced, but signal interference occurs and dimming accuracy deteriorates
Solution Approach 1:
The single light-emitting control signal line is segmented into two independent signal lines (first light-emitting control signal line and second light-emitting control signal line), each dedicated to controlling a specific light-emitting control transistor. This segmentation eliminates signal interference between the two transistors and improves dimming accuracy while maintaining reasonable device complexity through systematic wiring design.
2Area of stationary object
If the orthographic projection of the first light-emitting control signal line overlaps with the second light-emitting control signal line, then the area is reduced, but signal interference increases
Solution Approach 1:
The two light-emitting control signal lines are arranged in different conductive layers (first conductive layer and second conductive layer) rather than being planarly separated. This vertical dimensional separation eliminates signal interference by providing electrical insulation between layers while minimizing the horizontal area occupied by the signal lines, thus resolving the contradiction between area reduction and signal interference prevention.
3Use of energy by moving object
If PWM dimming is implemented to improve luminous efficiency, then luminous efficiency increases, but signal interference and control complexity increase
Solution Approach 1:
The PWM dimming control is segmented into two independent control paths, with each light-emitting control transistor receiving dedicated PWM signals through its own signal line. This segmentation enables precise independent control of each transistor's switching timing and duty cycle, improving luminous efficiency through optimized PWM modulation while keeping the control circuit complexity manageable through modular signal line design.
Solution Approach 2:
The control signal lines are positioned in different conductive layers to provide vertical separation, reducing signal interference and allowing for more flexible PWM signal routing. This spatial arrangement in multiple layers simplifies the control circuit design by eliminating the need for complex shielding and routing arrangements that would be required in a planar configuration.
Data Source
AI summary
An array substrate includes a substrate and pixel circuits disposed on the first substrate. A pixel circuit includes a first light-emitting control transistor and a second light-emitting control transistor. The array substrate further includes a first light-emitting control signal line and a second light-emitting control signal line. The first light-emmitting control signal line is electrically connected to a gate of the first light-emitting control transistor. The second light-emitting control signal line is electrically connected to a gate of the second light-emitting control transistor. The array substrate further includes conductive layers. The first light-emitting control signal line and the second light-emitting control signal line are electrically insulated. The first light-emitting control signal line and the second light-emitting control signed line are located in different conductive layers. Orthographic projections on the substrate, of the first light-emitting control signal line and the second light-emitting control signal line do not overlap.