Micro-LED Pixel Circuit for HDR Brightness and Color Control
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Solution Overview
Problem
Current display technologies face challenges in efficiently controlling the brightness and color gamut of micro light-emitting diode (micro LED) displays, particularly in achieving high-dynamic range (HDR) image technology, due to limitations in pixel circuit design and driving methods.
Innovation Solution
A pixel circuit is designed with a driving circuit, control circuit, and gating circuit, incorporating transistors and capacitors to control the transmission of voltage signals and driving current, allowing for precise grayscale control and intermittent light emission, enhancing brightness and color gamut performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional pixel circuit design is used, then the circuit structure is simple, but the brightness and color gamut control precision is insufficient for HDR display requirements
Solution Approach 1:
The pixel circuit is divided into multiple functional modules: driving circuit (including data writing sub-circuit and driving signal generation sub-circuit), control circuit (including first enable sub-circuit, second enable sub-circuit, first enable control sub-circuit, and second enable control sub-circuit), and gating circuit (including first output sub-circuit and second output sub-circuit). Each module performs a specific function in controlling the light-emitting device, allowing for precise brightness and color gamut control while maintaining modular design benefits.
2Illumination intensity
If continuous light emission is used, then the display brightness is maintained, but the energy consumption increases
Solution Approach 1:
The control circuit generates enable signals with different duty cycles to control the light-emitting device. By periodically switching the light emission on and off at high frequency, the circuit maintains average brightness while reducing peak power consumption and enabling pulse-width modulation (PWM) based grayscale control for HDR displays.
3Measurement precision
If a single enable signal is used, then the control circuit is simple, but the grayscale control precision is insufficient
Solution Approach 1:
The patent transitions from single-dimensional control (single enable signal) to multi-dimensional control by introducing multiple enable signals (first enable signal and second enable signal) with different duty cycles. This allows grayscale control through combination of multiple signal dimensions, achieving precise HDR grayscale representation while maintaining a systematic control architecture.
Data Source
AI summary
A pixel circuit includes a driving circuit, a control circuit and a gating circuit. The driving circuit is configured to control, under control of a scan signal and a signal received at an enable signal control terminal, on and off of a current path for transmitting a driving current signal. The control circuit is configured to transmit, under control of a control signal received at a control signal terminal, a first enable signal received at a first enable signal terminal or a second enable signal received at a second enable signal terminal to a first node. The gating circuit is configured to transmit, in response to an enable signal received at the first node, a first constant voltage signal received at the first constant voltage signal terminal or a second constant voltage signal received at the second constant voltage signal terminal to the enable signal control terminal.