7T1C Pixel Circuit Layout for High-Resolution AMOLED Displays
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Solution Overview
Problem
High-resolution display panels, such as AMOLEDs, face challenges in circuit layout and process complexity due to limited space, requiring efficient use of pixel circuit components.
Innovation Solution
A pixel circuit design incorporating specific transistors and lighting elements, along with a storage capacitor, optimized for reduced area occupation, utilizing seven transistors and one capacitor to drive red, green, and blue subpixels, and a driving method that adjusts current flow and monitors transistor states to achieve efficient lighting and threshold voltage acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high resolution is implemented in display panels, then display quality is improved, but the space for disposing pixel circuits is reduced
Solution Approach 1:
The patent merges the functions of multiple transistors into a shared configuration. Specifically, the third transistor T3 is shared among the first transistor T1, fifth transistor T5, sixth transistor T6, and seventh transistor T7, all of which have their sources connected to the sensing line Sense through T3. This sharing of the sensing path and transistor functions reduces the total component count and occupies less area while maintaining the ability to drive multiple lighting elements (red, green, blue subpixels) with proper sensing capability.
2Adaptability or versatility
If more transistors and capacitors are added to drive multiple lighting elements, then lighting control capability is improved, but device complexity increases
Solution Approach 1:
The patent implements multi-functionality through the fourth transistor T4, which serves multiple purposes: it acts as a sensing transistor when connected to the sensing line Sense, and simultaneously functions as a reset transistor when connected to the resetting line Reset. This dual functionality allows the same transistor structure to perform both sensing and resetting operations, reducing the need for separate dedicated transistors for each function while maintaining full control capability over the lighting elements.
Solution Approach 2:
The sensing functionality is merged into the existing transistor structure rather than being a separate component. The third transistor T3 and fourth transistor T4 are integrated into the circuit in such a way that they serve both as part of the driving path and as sensing elements. This integration eliminates the need for additional dedicated sensing transistors, reducing overall device complexity while maintaining adaptability for driving multiple lighting elements.
Data Source
AI summary
A pixel circuit, a related driving method and a display panel are provided. The pixel circuit, which is a 7T1C type circuit includes a storage capacitor (Cst), a first transistor (T1), a second transistor (T2), a third transistor (T3), a fifth transistor (T5), and a first lighting element (R).