Micro LED Pixel Circuit With Time-Shared Full-Color Emission
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Solution Overview
Problem
Micro LED pixel circuits require numerous transistors and signal lines, which hinder aperture ratio and light transmittance in display panels.
Innovation Solution
A pixel circuit design that includes a driving transistor, emission control transistor, and multiple light-emitting elements, sharing an emission control signal and system voltage terminals to reduce transistor and signal line count, allowing time-sharing light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the pixel circuit includes numerous transistors and signal lines to control multiple micro LEDs, then the emission control and light output are achieved, but the aperture ratio and light transmittance deteriorate
Solution Approach 1:
The patent merges the control of multiple light-emitting elements by sharing the emission control transistor and system voltage terminals among multiple LEDs (red, green, blue micro LEDs). This consolidation reduces the total number of transistors and signal lines required, directly addressing the contradiction by lowering device complexity while maintaining full-color display capability through time-sharing emission control
Solution Approach 2:
The emission control transistor and system voltage terminals serve multiple functions by controlling different light-emitting elements at different time intervals. A single emission control transistor manages multiple micro LEDs through sequential activation, making the circuit components universal rather than dedicated to individual LEDs, thereby reducing overall circuit complexity while preserving aperture ratio
2Area of stationary object
If the pixel circuit uses time-sharing emission control for multiple light-emitting elements, then the aperture ratio is improved, but the control complexity increases
Solution Approach 1:
The patent implements periodic action through time-sharing emission control, where different light-emitting elements are activated in sequential time intervals. The emission control signal operates periodically to switch between red, green, and blue micro LEDs, allowing each element to emit light during its designated time slot. This periodic control scheme reduces the need for simultaneous control lines while maintaining full-color capability, thus improving aperture ratio without excessive control complexity
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 the number of transistors and signal lines 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.