Display Driving Circuit Using Source Amplifier Comparison for Pixel Testing
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Solution Overview
Problem
The increased resolution of display devices, particularly those using OLED panels, necessitates extensive and costly time for testing to identify errors in pixels, which is inefficient.
Innovation Solution
A display driving circuit where a source amplifier operates as a comparator to compare a sample voltage with a comparison voltage, reducing the time and cost of identifying pixel errors by integrating switching elements to control this comparison process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate comparator is added to perform test operations on pixels, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The source amplifier is designed to perform dual functions: amplifying pixel voltages during normal display operation and comparing sample voltages with comparison voltages during test operations. By integrating the comparison function into the existing source amplifier circuit through switching elements, the patent eliminates the need for separate comparator circuits while maintaining pixel error detection capability.
2Measurement precision
If extensive test operations are performed on a large number of pixels, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The patent combines the test operation function with the existing source amplifier circuit by adding switching elements that enable the amplifier to operate in comparison mode. This integration allows test operations to be performed using the same hardware infrastructure as normal display operations, significantly reducing test time while maintaining detection accuracy across large numbers of pixels.
Data Source
AI summary
A display driving circuit includes a control logic, a source amplifier, and first and second switching elements. The source amplifier includes a first input terminal, a second input terminal, and an output terminal, and amplifies a pixel voltage for displaying an image on a display panel and provides the amplified pixel voltage to a pixel through a data line. The first switching element is connected between the first input terminal and the output terminal, and the second switching element is connected between the first input terminal and the sensing line. The control logic controls the first switching element and the second switching element such that the source amplifier compares a sample voltage that is input to the first input terminal through a sensing line with a comparison voltage input to the second input terminal and outputs comparison data based on the comparison.