Pixel Circuit Sub-Pixel Segmentation for AMOLED Resolution
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Solution Overview
Problem
Conventional pixel circuit designs for AMOLED displays are limited by the large area occupied by drive transistors and storage capacitors, which restricts the resolution of display panels and necessitates a new pixel circuit design to improve resolution without increasing panel size.
Innovation Solution
The proposed solution involves a dual sub-pixel circuit design where the first sub-pixel circuit emits light in the first half of the frame period and the second sub-pixel circuit emits light in the second half, sharing components like the storage capacitor and transistors to minimize crosstalk and reduce overall circuit size, while using PMOS transistors and specific signal control to manage light emission phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional 6T1C pixel circuit is used with a large drive transistor for threshold voltage compensation, then the compensation effect is achieved, but the pixel circuit area increases significantly
Solution Approach 1:
The pixel circuit is divided into two separate sub-pixel circuits (first sub-pixel circuit and second sub-pixel circuit) that operate in different time periods. Each sub-pixel circuit contains its own drive transistor and shares a storage capacitor. This segmentation allows for reduced transistor sizes while maintaining compensation functionality through time-sequential operation.
Solution Approach 2:
The circuit employs periodic time-sequential control where the first sub-pixel circuit operates during the first half of the frame period and the second sub-pixel circuit operates during the second half. This periodic action enables threshold voltage compensation to be achieved through time-multiplexed operation rather than requiring large transistors for simultaneous compensation.
2Reliability
If the drive transistor size is increased to improve threshold voltage compensation, then the compensation effect is enhanced, but the overall display panel resolution is limited
Solution Approach 1:
By segmenting the pixel circuit into two smaller sub-pixel circuits that operate sequentially in time, each drive transistor can be smaller in size. This allows for higher pixel density and improved display resolution while still achieving effective threshold voltage compensation through the time-sequential operation mode.
Solution Approach 2:
The time-sequential periodic operation allows the circuit to achieve compensation effects that would normally require larger transistors. By alternating operation between the first and second sub-pixel circuits, the system maintains compensation performance while using smaller transistors that enable higher resolution displays.
3Area of stationary object
If the display panel size is kept constant to maintain portability, then the pixel circuit area must be reduced, but this limits the ability to improve resolution
Solution Approach 1:
The pixel circuit is segmented into two sub-pixel circuits that share common components (storage capacitor Cs, transistors M1-M8). This segmentation reduces the total area required per pixel while maintaining functionality, enabling higher resolution displays within the same panel area.
Solution Approach 2:
The first and second sub-pixel circuits share common components including the storage capacitor Cs and multiple transistors (M1-M8). This merging of components reduces the overall pixel circuit area, allowing for higher resolution displays without increasing panel size.
4Area of stationary object
If two separate pixel circuits are used to reduce area through sharing, then component sharing reduces area, but crosstalk between circuits may occur
Solution Approach 1:
The circuit uses time-sequential periodic operation where the first sub-pixel circuit operates during the first half of the frame period and the second sub-pixel circuit operates during the second half. This temporal separation prevents crosstalk between the two circuits while allowing them to share common components, thus reducing area without introducing interference.
Solution Approach 2:
By segmenting the operation into distinct time periods for each sub-pixel circuit, the patent isolates the electrical activity of each circuit. This segmentation in the time domain prevents signal crosstalk while enabling spatial sharing of components, achieving area reduction without harmful interference.
Data Source
AI summary
The present invention relates to a pixel circuit comprising a first sub-pixel circuit and a second sub-pixel circuit, and the first sub-pixel circuit comprises a first light-emitting element which emits light in the first half of a frame period, and the second sub-pixel circuit comprises a second light-emitting element which emits light in the second half of the frame period.