Shared Pixel Circuit for High-Definition Display Capacitance
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Solution Overview
Problem
In organic EL display apparatuses, the reduction in pixel size and enhancement of definition lead to challenges in ensuring sufficient capacitance values for holding and sub capacitors, resulting in short optimum correction times for mobility correction, which affects the uniformity and quality of the display image.
Innovation Solution
A display apparatus configuration where multiple pixels in the same row share a common pixel circuit, including a driving transistor, writing transistor, and holding capacitor, allowing for increased layout area and capacitance values, thereby extending the correction time for mobility correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pixel size is reduced to enhance definition, then display resolution is improved, but capacitance value of holding capacitor becomes insufficient
Solution Approach 1:
The patent merges the pixel circuit of multiple pixels into a shared common circuit. Specifically, multiple pixels share a common holding capacitor and common driving transistor, allowing the capacitance value to be sufficiently large for mobility correction while maintaining high definition display. This merging approach resolves the contradiction by pooling resources across multiple pixels.
2Measurement precision
If pixel size is reduced to enhance definition, then display resolution is improved, but correction time for mobility correction becomes insufficient
Solution Approach 1:
By merging multiple pixel circuits into a shared common circuit, the patent extends the available correction time. The common holding capacitor with sufficient capacitance value allows the mobility correction operation to complete properly, even when pixel size is reduced for high definition display.
3Duration of action of moving object
If capacitance value is increased to ensure sufficient correction time, then mobility correction effectiveness is improved, but pixel area becomes too large
Solution Approach 1:
The patent combines multiple pixels into a single pixel circuit unit that shares common capacitors and transistors. This merging allows the holding capacitor to have a sufficiently large capacitance value for effective mobility correction without each individual pixel requiring large area, thus maintaining high definition while ensuring adequate correction time.
4Adaptability or versatility
If separate pixel circuits are provided for each pixel, then pixel independence is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple pixel circuits into shared common circuits for holding capacitors and driving transistors. This reduces device complexity by eliminating redundant components while maintaining pixel functionality through the shared architecture. Each pixel can still be independently controlled through the common circuit structure.
Data Source
AI summary
Disclosed here in is a display apparatus, including, a pixel array section including a plurality of pixels arrayed in rows and columns and each including an electro-optical device, a pixel circuit provided commonly to each plural ones of the pixels in the same pixel row in the pixel array section and including a writing transistor for writing an image signal, a holding capacitor for holding the image signal written by the writing transistor and a driving transistor for driving the electro-optical devices of the plural pixels, and a plurality of scanning circuits configured to time-divisionally and selectively place the electro-optical devices included in the pixels into a forwardly biased state.