Micro LED Pixel Circuit With Shared Emission Control
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Solution Overview
Problem
Micro LED pixel circuits require numerous transistors and signal lines for emission control, which hinders aperture ratio and light transmittance.
Innovation Solution
A pixel circuit design that includes a driving transistor, emission control transistor, and multiple light-emitting elements, sharing a common emission control signal and voltage terminals to reduce the number of transistors and signal lines, allowing for time-sharing light emission among elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the pixel circuit includes more transistors and signal lines to control multiple micro LEDs, then the emission control capability is improved, but the aperture ratio and light transmittance deteriorate
Solution Approach 1:
The patent merges the control of multiple light-emitting elements (first and second light-emitting elements) into a single pixel circuit structure. The emission control transistor and voltage terminals are shared between multiple light-emitting elements, allowing simultaneous control of R, G, and B micro LEDs without requiring separate control circuits for each element. This consolidation reduces the overall number of transistors and signal lines while maintaining full-color display capability.
Solution Approach 2:
The voltage terminals (first, second, and third system voltage terminals) are designed to serve multiple functions by providing different voltage levels to different light-emitting elements. The same terminal structure can emit different colors (R, G, B) by adjusting voltage levels, making the circuit universally applicable for full-color display without requiring dedicated control paths for each color channel.
2Ease of operation
If the pixel circuit includes more transistors and signal lines for each micro LED, then the individual emission control is improved, but the light transmittance deteriorates
Solution Approach 1:
The patent combines the control mechanisms for multiple light-emitting elements into a shared circuit structure. The emission control transistor and voltage terminal system are共用 by multiple micro LEDs, allowing individual emission control through voltage level differentiation rather than through separate control transistors for each element. This merging approach maintains individual controllability while reducing the total transistor count.
Solution Approach 2:
The patent controls individual light-emitting element emission by changing voltage parameters (voltage levels at different system voltage terminals) rather than by adding more control transistors. By adjusting the voltage levels at the first, second, and third system voltage terminals, the circuit can selectively activate different light-emitting elements (R, G, or B) without requiring separate control paths for each element.
3Measurement precision
If the pixel circuit uses separate control circuits for each light-emitting element, then the emission precision is improved, but the device complexity increases
Solution Approach 1:
The patent merges multiple control functions into a unified circuit structure where the emission control transistor and voltage terminal system serve multiple light-emitting elements simultaneously. This consolidation maintains emission precision through voltage level differentiation while significantly reducing circuit complexity compared to having separate control circuits for each micro LED.
Solution Approach 2:
The voltage terminal system is designed with multi-functionality to provide precise control for different light-emitting elements. The same terminal structure can selectively activate R, G, or B emission by adjusting voltage levels, achieving precise emission control without requiring dedicated control circuits for each color channel.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances aperture ratio and light transmittance by reducing transistor and signal line count while achieving full-color display through multi-pulse time-sharing light emission.
Implementation Method 1
The first light-emitting element is coupled between a second terminal of the driving transistor and a second system voltage terminal to emit light with a first color. The second light-emitting element is coupled between the second terminal of the driving transistor and a third system voltage terminal to emit light with a second color different from the first color.
Data Source
AI summary
A pixel circuit includes a driving transistor, an emission control transistor, a first light-emitting element and a second light-emitting element. The emission control transistor is between a first terminal of the driving transistor and a first system voltage terminal. The first light-emitting element is between a second terminal of the driving transistor and a second system voltage terminal. The second light-emitting element is between the second terminal of the driving transistor and a third system voltage terminal. The first light-emitting element is controlled by an emission control signal of a gate terminal of the emission control transistor and a voltage level of the second system voltage terminal. The second light-emitting element is controlled by the emission control signal and a voltage level of the third system voltage terminal. When the first or second light-emitting element emits light, the second and third system voltage terminals have different voltage levels.