Display Scan Circuit Timing for Uniform Row Luminance
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Solution Overview
Problem
Existing display technologies face challenges in efficiently controlling image display due to variations in threshold voltages of driving transistors across adjacent rows of subpixels, leading to inconsistent luminance and display quality.
Innovation Solution
The implementation of a display apparatus with alternating scan circuits, including first and second scan units providing out-of-phase control signals to adjacent rows of subpixels, and a third scan unit providing in-phase signals to both rows, along with varying effective voltage durations, to compensate for threshold voltage differences and enhance luminance uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single scan circuit is used to control all rows of subpixels, then the device complexity is reduced, but luminance uniformity deteriorates due to threshold voltage variations across different rows
Solution Approach 1:
The scan circuit is divided into multiple independent scan units (first scan units and second scan units) that are alternately arranged. Each scan unit controls specific rows of subpixels, allowing independent adjustment of control signals for each unit. This segmentation enables compensation for threshold voltage variations in different rows while maintaining manageable circuit complexity.
Solution Approach 2:
Different scan units are configured to provide different control signal characteristics to different rows. The first scan units provide control signals with one effective voltage duration while the second scan units provide control signals with a different effective voltage duration. This local differentiation allows each row to receive optimally tuned control signals that compensate for row-specific threshold voltage variations, achieving uniform luminance across the display.
2Ease of manufacture
If control signals with equal effective voltage duration are provided to all rows, then the circuit design is simplified, but display quality deteriorates due to inconsistent luminance compensation
Solution Approach 1:
The patent implements different effective voltage durations for control signals provided by different scan units. Specifically, first scan units provide control signals with a first effective voltage duration while second scan units provide control signals with a second effective voltage duration. This local customization of signal parameters enables precise compensation for threshold voltage variations across different rows, ensuring high display quality and luminance uniformity.
Solution Approach 2:
The patent changes the parameter of effective voltage duration in control signals based on the row being controlled. By adjusting this temporal parameter differently for different scan units, the system compensates for threshold voltage variations without requiring complex circuit redesign. This parameter-based differentiation achieves high display quality while maintaining relatively simple circuit architecture.
3Manufacturing precision
If alternating scan units provide out-of-phase control signals to adjacent rows, then luminance uniformity is improved through threshold voltage compensation, but the device complexity increases
Solution Approach 1:
The scan circuit is segmented into alternating first scan units and second scan units, where each unit is responsible for controlling specific rows. This segmentation allows the implementation of out-of-phase control signals to adjacent rows through a structured, modular architecture that manages complexity while achieving luminance uniformity compensation.
Solution Approach 2:
The patent implements periodic alternation between first scan units and second scan units that provide out-of-phase control signals. This periodic structure creates a regular, predictable pattern of signal phases that simplifies the overall circuit design while effectively compensating for threshold voltage variations. The alternating pattern ensures that adjacent rows receive appropriately phased control signals for uniform luminance compensation.
Data Source
AI summary
A display apparatus includes a plurality of rows of subpixels, a first scan circuit, and a second scan circuit. The first scan circuit includes a plurality of first scan units and a plurality of second scan units alternately arranged. The second scan circuit includes a plurality of third scan units. A respective first scan unit and a respective second scan unit are configured to provide control signals to two adjacent rows of subpixels, respectively. A respective third scan unit is configured to provide control signals to the first adjacent row of subpixels and the second adjacent row of subpixels. Control signals output from the respective first scan unit are out of phase with respect to control signals output from the respective second scan unit. A first duration of an effective voltage of a first control signal output from the respective first scan unit is greater than a second duration of an effective voltage of a second control signal output from the respective second scan unit.