Micro LED Display Device Stabilizing Light Emission via Dynamic Period Control
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Solution Overview
Problem
Micro LED display devices face challenges in stabilizing light emission for low gradation images due to the difficulty in controlling current and light emitting periods, leading to unstable light emitting operations.
Innovation Solution
The display device incorporates a configuration with a gate driver and an erase driver that control the light emitting period of micro LEDs by switching between different control signals, allowing for the combination of current control and light emitting period management to stabilize light emission across varying gradations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If current control is used to adjust light emission for low gradation images, then light emission can be adjusted, but light emitting operation becomes unstable
Solution Approach 1:
The patent applies dynamics by making the light emitting period adjustable rather than fixed. The control circuit dynamically changes the light emitting period based on the gradation level, using longer periods for low gradation and shorter periods for high gradation. This dynamic adjustment stabilizes the light emitting operation while maintaining appropriate brightness levels across different gradations.
Solution Approach 2:
The patent changes the time parameter (light emitting period) instead of relying solely on current control. By adjusting the duration of light emission within each frame period, the system achieves stable brightness control for low gradation images without the instability associated with minute current settings.
2Illumination intensity
If minute current settings are used to achieve low gradation, then light emission can be reduced, but control precision and stability deteriorate
Solution Approach 1:
The system dynamically adjusts the light emitting period based on the required gradation level. For low gradation images, the light emitting period is extended, providing a larger time window for light emission that improves control precision. This eliminates the need for imprecise minute current settings while achieving the desired low brightness levels.
Solution Approach 2:
The patent uses periodic light emission within each frame period, where the light emitting element is driven to emit light for a controlled duration. By varying the period of light emission rather than the current magnitude, the system achieves precise control over illumination intensity without the precision limitations of current control.
3Illumination intensity
If light emitting period is extended for low gradation, then brightness can be reduced, but frame rate and refresh speed decrease
Solution Approach 1:
The patent implements periodic light emission where the light emitting element is activated for a controlled period within each frame. By adjusting the light emitting period rather than extending it indefinitely, the system reduces brightness for low gradation while maintaining the overall frame rate and refresh speed through efficient use of the available time window.
Solution Approach 2:
The system dynamically adjusts the light emitting period based on the gradation level, using longer periods for low gradation and shorter periods for high gradation. This dynamic adjustment optimizes the balance between brightness control and frame refresh speed, ensuring that the display maintains high refresh rates while achieving the desired brightness levels.
4Reliability
If control circuit complexity is increased to manage light emitting periods, then light emission stability improves, but device complexity increases
Solution Approach 1:
The control circuit is designed with multi-functionality, serving both to control the light emitting period and to manage the overall pixel operation. By integrating these functions into a single control circuit rather than adding separate dedicated circuits, the patent achieves stable light emitting control while minimizing the increase in device complexity.
Solution Approach 2:
The patent merges the light emitting period control function with the existing pixel control circuitry. Rather than adding a completely separate control system, the light emitting period adjustment is integrated into the existing control architecture, reducing the overall complexity increase while maintaining the stability benefits of periodic control.
Data Source
AI summary
According to one embodiment, a display device includes a first power supply line, a second power supply line, a reset line, pixels, gate lines, control wiring lines, source lines, a first driver and a second driver. Each of the pixels includes a drive transistor, a light emitting element, a pixel switch, a storage capacitor and a reset switch. The reset switch is connected between the reset line and a gate electrode of the drive transistor, and switched between an ON state and an OFF state by a second control signal provided via a corresponding control wiring line among the control wiring lines.