Pixel Driving Circuit With Fewer Driving Lines for Narrow Bezels
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Solution Overview
Problem
Conventional internal compensation circuits for display panels require multiple groups of driving timings, leading to larger panel boundaries that cannot accommodate narrow bezel designs.
Innovation Solution
A pixel driving circuit with a simplified structure including a data input circuit, reset circuit, energy storage circuit, light-emitting control circuit, compensation circuit, and switch-circuits, utilizing reduced scanning signals to control the on/off states of these components, thereby reducing the number of driving lines and facilitating narrow bezel designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional internal compensation circuit (6T1C) is used to improve image display accuracy and uniformity, then the image quality is improved, but the panel boundary becomes larger, making it incompatible with narrow bezel requirements
Solution Approach 1:
The patent combines the compensation circuit function with the existing pixel driving circuit by sharing the light-emitting control circuit and integrating compensation transistors (T5, T6) and compensation capacitor (Ccomp) into the pixel circuit. This merging approach enables compensation functionality without adding separate dedicated compensation circuitry, thus avoiding increased panel boundary.
Solution Approach 2:
The light-emitting control circuit serves dual purposes: it controls the light-emitting device during the light-emitting phase and simultaneously functions as part of the compensation circuit during the data-writing phase. The same transistor and capacitor components are utilized for both driving and compensation operations, eliminating the need for additional dedicated compensation components.
2Reliability
If multiple groups of driving timings (two groups of scanning signals and two groups of enable signals) are used in conventional compensation circuits, then compensation functionality is achieved, but the number of driving lines increases, preventing narrow bezel design
Solution Approach 1:
The scanning signal line and enable signal line serve multiple functions across different phases. The same scanning signal line controls both data writing and compensation operations at different times, and the enable signal line controls both the light-emitting device and compensation circuitry, reducing the total number of required signal lines.
Solution Approach 2:
The circuit operates in periodic phases where the same physical components are activated at different times for different functions. During the data-writing phase, transistors T5 and T6 and capacitor Ccomp perform compensation functions, while during the light-emitting phase, the same components control light emission, achieving multiple functions through time-division multiplexing.
Data Source
AI summary
A pixel driving circuit and a display device are provided. The pixel driving circuit includes a data input circuit, a reset circuit, an energy storage circuit, a light-emitting control circuit, a compensation circuit, a first switch-circuit, a second switch-circuit, and a third switch-circuit. The data input circuit is electrically connected to a first end of the light-emitting control circuit and a first control end of the light-emitting control circuit. An output end of the reset circuit is electrically connected to a second control end of the light-emitting control circuit. A second end of the light-emitting control circuit is electrically connected to the first switch-circuit. The first end of the light-emitting control circuit is configured to be electrically connected to an anode of a light-emitting device through the second switch-circuit. An output end of the compensation circuit is configured to be electrically connected to the anode of the light-emitting device.