Display Pixel Sensing Layout for Faster Luminance Compensation
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Solution Overview
Problem
Display devices experience luminance deviations and screen abnormalities due to variations in the characteristic values of circuit elements within sub-pixels, leading to reduced luminance accuracy and expressiveness.
Innovation Solution
Incorporation of a sensing transistor to accurately sense the characteristic values of sub-pixels, such as threshold voltage and mobility, allowing for faster and more precise compensation of data voltage to maintain consistent luminance across sub-pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional sensing methods are used without a dedicated sensing transistor, then device complexity is reduced, but sensing precision and sensing speed deteriorate
Solution Approach 1:
A dedicated sensing transistor is introduced as an intermediary component between the sub-pixel circuit elements and the sensing node. This transistor acts as a mediator that enables precise sensing of characteristic values (such as threshold voltage and mobility) by controlling the flow of sensing signals, thereby achieving high measurement precision while maintaining a manageable device structure through modular integration.
2Speed
If traditional sensing methods are used without a dedicated sensing transistor, then device complexity is reduced, but sensing speed deteriorates
Solution Approach 1:
The sensing transistor serves as a dedicated intermediary that accelerates the sensing process by providing a direct and controlled signal path for measuring characteristic values. This mediator enables faster charge transfer and signal acquisition, thereby improving sensing speed without requiring complex parallel sensing architectures.
3Measurement precision
If sensing time for all sub-pixels is extended to ensure accurate sensing, then sensing precision is improved, but productivity deteriorates
Solution Approach 1:
The sensing transistor enables preliminary sensing actions to be performed during idle periods or in parallel with other display operations. By preparing and acquiring characteristic value data in advance through the dedicated sensing transistor, the system achieves accurate sensing results without extending the overall processing time, thereby maintaining high productivity.
4Manufacturing precision
If characteristic values are not accurately sensed and compensated, then device complexity is reduced, but luminance accuracy deteriorates
Solution Approach 1:
The sensing transistor enables a feedback mechanism where characteristic values (such as threshold voltage and mobility) are accurately sensed and used to adjust and compensate the data voltage supplied to sub-pixels. This feedback loop ensures that luminance accuracy is maintained despite variations in circuit element characteristics, achieving high manufacturing precision through intelligent compensation rather than complex hardware.
Data Source
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AI summary
According to an aspect of the present disclosure, a display device includes a display panel in which a plurality of pixels including a first sub pixel, a second sub pixel, and a third sub pixel each having a different color is disposed; a data driver configured to supply a data voltage to the plurality of pixels via a plurality of data lines using a sensing result of the plurality of pixels via a first reference voltage line, a second reference voltage line, and a third reference line; and a gate driver configured to supply a gate signal to the plurality of pixels via a plurality of gate lines, in which the plurality of first sub pixels is disposed in a 9k-8th column, a 9k-5th column, and a 9k-2th column, in which the plurality of second sub pixels is disposed in a 9k-7th column, a 9k-4th column, and a 9k-lst column, the plurality of third sub pixels is disposed in a 9k-6th column, a 9k-3rd column, and a 9k-th column, each of the plurality of data lines is branched into a plurality of sub data lines and each of the plurality of sub data lines is connected to a plurality of sub pixels having the same color, the first reference voltage line is connected to the plurality of first sub pixels disposed in the 9k-8th column, the plurality of second sub pixels disposed in the 9k-7th column, and the plurality of third sub pixels disposed in the 9k-6th column, the second reference voltage line is connected to the plurality of first sub pixels disposed in the 9k-5th column, the plurality of second sub pixels disposed in the 9k-4th column, and the plurality of third sub pixels disposed in the 9k-3th column, and the third reference voltage line is connected to the plurality of first sub pixels disposed in the 9k-2nd column, the plurality of second sub pixels disposed in the 9-lst column, and the plurality of third sub pixels disposed in the 9k-th column to improve a sensing speed of the sub pixel.