Pixel Circuit Layout Using a Shared Data Reset Switch
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Solution Overview
Problem
The size of the pixel circuit in current display panels is increased due to the need for multiple transistors, capacitors, and signal lines, limiting the number of pixel circuits that can be laid out and hindering the improvement of display resolution.
Innovation Solution
A pixel circuit design that includes a driving transistor, switches, and capacitors, where the data writing and voltage resetting operations are performed by the same switch, allowing for a reduced layout area and improved display resolution by sharing switches between pixel circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple transistors, capacitors, and signal lines are equipped in the pixel circuit to improve display quality, then the display quality is improved, but the size of the pixel circuit is increased
Solution Approach 1:
The patent merges multiple functions into a single first switch element. The first switch element performs both data writing operation and voltage resetting operation on the control end of the driving transistor, eliminating the need for separate switch elements for each function. This consolidation reduces the overall pixel circuit size while maintaining display quality through shared functional pathways.
Solution Approach 2:
The first switch element is designed with multi-functionality, serving as a universal switch that handles both data writing and voltage resetting operations. By making the switch element universal rather than specialized for single functions, the patent reduces the total number of switch elements required in the pixel circuit, thereby reducing pixel circuit size without compromising display quality.
2Adaptability or versatility
If the pixel circuit size is increased to accommodate multiple transistors, capacitors, and signal lines, then more functions can be implemented, but the number of pixel circuits that can be laid out on a fixed area display panel is limited
Solution Approach 1:
By merging data writing and voltage resetting operations into a single first switch element, the patent reduces the component count in each pixel circuit. This consolidation frees up layout space on the display panel, enabling a higher density of pixel circuits to be arranged within the same area, thus increasing productivity without sacrificing circuit functionality.
Solution Approach 2:
The universal first switch element that performs multiple functions reduces the overall circuit complexity and space requirements. This multi-functional design allows more pixel circuits to be packed into the display panel area while maintaining full functionality for data writing and voltage resetting operations in each pixel circuit.
3Reliability
If more switch elements are used to perform data writing and voltage resetting operations separately, then operational reliability is improved, but the layout area of the pixel circuit is increased
Solution Approach 1:
The patent combines data writing and voltage resetting operations into a single first switch element, reducing the number of switch elements from two to one. This merging maintains operational reliability by ensuring both critical operations can still be performed, while significantly reducing the layout area required for the pixel circuit.
Solution Approach 2:
The first switch element is designed as a universal switch capable of performing both data writing and voltage resetting operations. This multi-functional approach maintains the reliability needed for both operations while reducing the total switch element count and corresponding layout area, as the same physical switch element serves multiple operational purposes.
Data Source
AI summary
A display panel and a pixel circuit are provided. The pixel includes a driving transistor, a first switch, a second switch, and a third switch. The driving transistor and a light emitting device are coupled in series, and controlled by a driving voltage to drive the light emitting device. The first switch is coupled between a control end of the driving transistor and a source line, and controlled by a first gate signal. The second switch, the driving transistor, and the light emitting device are serially coupled between a power voltage and a reference ground voltage, and controlled by a second gate signal. The third switch is coupled between the light emitting device and a setting/sensing voltage transmission wire, and controlled by a third gate signal. A data writing operation and a voltage resetting operation of the control end of the driving transistor are performed by the same first switch.