Display Pixel Threshold Sensing for High-Resolution Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display quality is deteriorated due to threshold voltage variations of driving switching elements in display panels, and existing solutions with compensation transistors complicate the pixel structure, hindering high resolution support.
Innovation Solution
A display apparatus that compensates for threshold voltage by sensing the on-state of driving switching elements using a gradually decreasing sensing data voltage, without requiring a compensation transistor, thereby simplifying the pixel structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a compensation transistor is added to compensate for threshold voltage variations, then display quality is improved, but pixel structure becomes complex and high resolution support is hindered
Solution Approach 1:
The patent extracts the threshold voltage compensation function from the traditional compensation transistor and implements it through a sensing circuit that measures the actual threshold voltage of the driving transistor. By separating the compensation function from the pixel structure itself and implementing it through external sensing and calculation, the pixel structure is simplified while maintaining compensation capability, thus resolving the contradiction between display quality and pixel structure complexity
Solution Approach 2:
The patent introduces a sensing circuit and control circuit as intermediaries to measure the threshold voltage of the driving transistor and calculate compensation values. These intermediary circuits external to the pixel structure enable threshold voltage compensation without requiring additional transistors within the pixel, thereby maintaining display quality while reducing pixel structure complexity
2Productivity
If pixel structure is simplified to support high resolution, then device density is improved, but threshold voltage compensation capability is reduced
Solution Approach 1:
The patent implements a feedback mechanism where the sensing circuit continuously measures the threshold voltage of the driving transistor, and the control circuit uses this feedback information to calculate and apply appropriate compensation values to the data signal. This feedback loop ensures that threshold voltage compensation is maintained even with simplified pixel structures, resolving the contradiction between device density and compensation capability
Solution Approach 2:
The patent replaces the traditional mechanical/electrical compensation transistor structure with an electronic sensing and calculation system. By using voltage sensing and digital/analog calculation circuits to determine compensation values, the system achieves threshold voltage compensation through electronic means rather than additional transistor structures, thereby maintaining compensation capability while enabling higher device density
Data Source
AI summary
A display apparatus includes a display panel, a data driver and a memory, wherein the display panel includes a first pixel. The data driver is configured to output a grayscale data voltage corresponding to input image data provided to the first pixel in a driving mode and an output of a sensing data voltage, which is gradually decreased, to the first pixel in a sensing mode. Additionally, the memory is configured to store a turned-on voltage at a turned-on time point of a first switching element of the first pixel as the sensing data voltage gradually decreases in the sensing mode.