Display Pixel Wiring Layout for Lower Readout Coupling Capacitance
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Solution Overview
Problem
Existing display devices face challenges in maintaining reliability due to coupling capacitance issues between data lines and readout lines, which can affect the performance and functionality of the display and light-sensing pixels.
Innovation Solution
The display device is designed with data lines and readout lines in different layers, incorporating a dummy pattern in the same layer as the data lines and a reset voltage wiring, which is electrically connected to the light-sensing pixel, to reduce coupling capacitance by maintaining a separation distance and providing a bi-layer structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data lines and readout lines are disposed in the same layer, then the device structure is simpler, but coupling capacitance increases affecting reliability
Solution Approach 1:
The patent applies dimensional separation by disposing the readout line and data lines in different layers (first conductive layer vs. second conductive layer). This vertical separation in the layer dimension reduces coupling capacitance between the readout line and data lines while maintaining electrical connectivity functions, thereby improving reliability without excessive complexity increase.
Solution Approach 2:
The patent introduces a dummy pattern as an intermediary element disposed between the data lines and readout line. This dummy pattern acts as a shielding structure that reduces coupling capacitance by redistributing electric field lines, serving as a mediator that allows both lines to coexist in close proximity while minimizing harmful electromagnetic coupling.
2Area of stationary object
If data lines and readout lines are placed close together, then area is reduced, but coupling capacitance affects performance
Solution Approach 1:
By separating data lines and readout lines into different vertical layers, the patent enables closer horizontal spacing without increasing coupling capacitance. This dimensional reorganization allows compact area utilization while maintaining signal integrity and pixel performance through reduced electromagnetic coupling.
Solution Approach 2:
The dummy pattern serves as a shielding intermediary that enables close proximity placement of data lines and readout lines. By positioning the dummy pattern between these lines, the patent reduces coupling capacitance effects, allowing area optimization without compromising pixel performance.
3Reliability
If dummy pattern is electrically connected to readout line, then coupling capacitance is reduced, but device complexity increases
Solution Approach 1:
The patent merges the dummy pattern with existing conductive structures by electrically connecting it to the readout line through the second conductive layer. This integration approach reduces coupling capacitance while minimizing additional complexity, as the dummy pattern shares the same conductive material and processing steps as the readout line.
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 the reliability of the display device by minimizing coupling capacitance, thereby improving the performance and functionality of both light-emitting and light-sensing pixels.
Implementation Method 1
a light-receiving element; a first sensor transistor for controlling current flowing to the readout line in response to a voltage of one electrode of the light-receiving element
Data Source
AI summary
A display device includes: a first subpixel, a second subpixel, and a third subpixel arranged in a first direction; a light-sensing pixel including a sensor circuit, and disposed between the second subpixel and the third subpixel; a readout line extending along a second direction, and electrically connected to the light-sensing pixel; a first data line extending along the second direction, and electrically connected to the second subpixel; a second data line extending along the second direction, and electrically connected to the third subpixel; a dummy pattern disposed between the first data line and the second data line; and a reset voltage wiring electrically connected to the light-sensing pixel and supplied with a reset voltage. The readout line may be disposed in a different layer from the first and second data lines. The readout line may be disposed in a same layer as the reset voltage wiring.