AMOLED Array Substrate Voltage Compensation Circuit
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Solution Overview
Problem
AMOLED displays experience image sticking phenomena due to degradation of organic light-emitting elements over time, leading to reduced usage life and display quality.
Innovation Solution
An array substrate with a voltage driving circuit, current sensing circuit, test pixels, current comparison circuit, and voltage compensation circuit that compares current values through test pixels with set thresholds and compensates driving voltage to prevent pixel degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If voltage driving is used to drive display pixels, then brightness and response speed are improved, but pixel degradation occurs over time leading to image sticking
Solution Approach 1:
The patent applies preliminary action by detecting current values of display pixels before significant degradation occurs and proactively adjusting driving voltages to compensate for potential degradation. The system performs initial current detection and establishes baseline values, then uses these to predict and prevent future image sticking issues by pre-adjusting driving parameters.
Solution Approach 2:
The patent implements feedback mechanisms where current sensing circuits continuously monitor the actual current values of display pixels, and this feedback information is used by the compensation circuit to dynamically adjust driving voltages. The system compares detected current values with reference values and automatically compensates by adjusting driving voltages to maintain consistent pixel performance over time.
2Reliability
If current compensation is implemented to prevent pixel degradation, then image sticking is avoided, but device complexity increases
Solution Approach 1:
The patent merges multiple functions into integrated circuits to reduce overall device complexity. The current sensing circuit is integrated with the pixel array, and the compensation circuit is combined with the driving circuitry. Test pixels are merged with the display pixel array structure, allowing shared circuit resources and reducing the number of separate components needed for compensation functionality.
Solution Approach 2:
The patent applies self-service by using a portion of the display pixel array itself (test pixels) as the sensing element for detection. The system uses its own existing structures rather than requiring entirely separate external sensing circuits. The compensation mechanism serves itself by using the pixel array's own current characteristics to generate compensation signals.
3Measurement precision
If test pixels are added to every pixel unit for current detection, then detection precision is improved, but manufacturing complexity increases
Solution Approach 1:
The patent segments the pixel array into display pixels and test pixels with distinct functional roles. Test pixels are strategically positioned within the array structure, allowing separate detection functionality while maintaining overall array integrity. This segmentation enables precise current measurement without requiring every single pixel to have full detection capabilities.
Solution Approach 2:
The patent applies universality by designing test pixels that share the same basic structure and fabrication process as display pixels, allowing the same manufacturing line to produce both types. The test pixels serve multiple purposes: current detection, characterization of pixel performance, and validation of manufacturing quality, reducing the need for separate specialized components.
Data Source
AI summary
There are provided an array substrate and a display apparatus. The array substrate comprises a voltage driving circuit (1) for driving display pixels to display images, a current sensing circuit (2), and further comprises test pixels (3), a current comparison circuit (4), and a voltage compensation circuit (5), wherein the current sensing circuit (2) is connected to the test pixels (3) and the current comparison circuit (4), and the current comparison circuit (4) is connected to the voltage compensation circuit (5); the current comparison circuit (4) compares the current value of the current sensed by the current sensing circuit and flowing through the test pixels (3) with a set threshold, and outputs the comparison result to the voltage compensation circuit (5); and the voltage compensation circuit (5) compensates for the driving voltage of the voltage driving circuit (1) when the current value is smaller than the set threshold. The array substrate can compensate for the current of the display pixels to avoid occurrence of the pixel degradation.