AMOLED Pixel Circuit Alternation for Block Crosstalk Reduction
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Solution Overview
Problem
As display pixels per inch increase and row time decreases, AMOLED pixel circuits face block crosstalk issues due to reduced data writing and threshold voltage compensation times, affecting the potential of each node in the pixel circuit.
Innovation Solution
The pixel structure incorporates alternating rows of first and second type pixel circuits, where the display brightness of the first type increases with data voltage and decreases for the second type, with reference voltage writing operations occurring before and after data voltage writing respectively, and data voltages alternating between high and low values to reduce block crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data writing time and threshold voltage compensation time are reduced due to increased refresh rate requirements, then productivity is improved, but block crosstalk problems worsen
Solution Approach 1:
The pixel circuits are divided into first type and second type circuits with different operational characteristics. The first type pixel circuit performs threshold voltage compensation before data voltage writing, while the second type performs it after. This segmentation allows each type to handle crosstalk differently, with the alternating arrangement creating a balancing effect that reduces overall block crosstalk while maintaining high refresh rates.
Solution Approach 2:
Different regions of the display panel are assigned different pixel circuit types with locally optimized characteristics. The alternating arrangement of first and second type pixel circuits creates local variations in electrical characteristics, which helps compensate for crosstalk effects in each specific region while maintaining overall display performance at high refresh rates.
2Productivity
If row time is reduced to meet resolution requirements, then productivity is improved, but data writing time and threshold voltage compensation time are reduced, worsening block crosstalk
Solution Approach 1:
The first type pixel circuit performs threshold voltage compensation before data voltage writing, proactively preparing the pixel circuit state to reduce subsequent crosstalk effects. This preliminary action allows the circuit to be more resistant to crosstalk during the data writing phase, enabling faster writing times without sacrificing signal integrity.
3Object-affected harmful factors
If alternating first and second type pixel circuits are used, then block crosstalk is reduced, but device complexity increases
Solution Approach 1:
Both first and second type pixel circuits use the same basic transistor structure and operational principles, with the main difference being the timing of threshold voltage compensation relative to data voltage writing. This universality allows the complex alternating arrangement to be implemented using standardized circuit designs, reducing the actual complexity increase while still achieving crosstalk reduction.
Data Source
AI summary
A pixel structure, a display panel and a display device are provided. The pixel structure includes: pixel circuits arranged in rows and columns, the pixel circuits including a first type and a second type of pixel circuits; a data line electrically connected to the pixel circuits, and used for providing a data voltage to the pixel circuit; the pixel circuits in two adjacent rows electrically connected to at least one data line are the first and second types of pixel circuits; light-emitting elements, including a first and a second light-emitting elements electrically connected to the first type and the second type of pixel circuits respectively; a display brightness of the first light-emitting element increases as the data voltage provided to the first type of pixel circuit increases; a display brightness of the second light-emitting element decreases as data voltage provided to the second type of pixel circuit increases.