LTPO Pixel Circuit Transistor Reduction Narrow Bezel
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Solution Overview
Problem
Low-temperature polycrystalline oxide (LTPO) pixel circuits have a large number of transistors, making it difficult to achieve a narrow bezel in display technology.
Innovation Solution
A pixel circuit is designed with a resetting circuit, a first light-emitting control circuit, a compensation control circuit, and a driving circuit, which reduces the number of transistors required by using a specific configuration of transistors and control signals to reset and drive the light-emitting element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a low-temperature polycrystalline oxide (LTPO) pixel circuit is used, then the light emission control is improved, but the number of transistors increases making it difficult to provide a narrow bezel
Solution Approach 1:
The patent combines multiple functions into shared circuits: the compensation control circuit shares the emission control line with the light-emitting control circuit, and the resetting circuit shares the initial voltage terminal. This merging reduces the total transistor count while maintaining the light emission control capabilities of LTPO pixel circuits.
Solution Approach 2:
The emission control line serves dual purposes: it controls both the light-emitting control circuit and the compensation control circuit. Similarly, the initial voltage terminal is shared between the resetting circuit and other circuit components, making these elements multi-functional and reducing overall circuit complexity.
2Length of moving object
If the number of transistors is reduced, then the bezel width is narrowed, but the power efficiency and display quality must be maintained
Solution Approach 1:
The resetting circuit writes an initial voltage into the first electrode of the light-emitting element in advance during the resetting phase. This preliminary action ensures that the light-emitting element is properly initialized before the light emission phase, maintaining display quality and power efficiency despite the reduced transistor count.
Solution Approach 2:
The compensation control circuit controls the control terminal of the driving circuit to be electrically connected to the first terminal under the control of a scanning signal. This feedback mechanism ensures proper voltage levels and timing, maintaining power efficiency and display quality while using fewer transistors.
Data Source
AI summary
A pixel circuit includes a light-emitting element, a driving circuit, a first light-emitting control circuit, a compensation control circuit and a resetting circuit. The resetting circuit is configured to write an initial voltage into the first electrode of the light-emitting element under the control of a first light-emitting control signal, the first light-emitting control circuit is configured to control the first electrode of the light-emitting element to be electrically connected to the first terminal of the driving circuit under the control of a second light-emitting control signal, and the compensation control circuit is configured to control the control terminal of the driving circuit to be electrically connected to the first terminal of the driving circuit under the control of a first scanning signal.