Dual-Gate Pixel Drive Circuit for Small-Pitch Hybrid Modulation
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Solution Overview
Problem
The challenge of simplifying the pixel drive circuit for Micro LED displays to accommodate smaller pitches while maintaining compatibility with existing drive modes, particularly in high-end products like large TVs and virtual reality devices, is unresolved due to space constraints and high costs.
Innovation Solution
A pixel drive circuit utilizing a dual-gate transistor and a timing control method that integrates pulse width modulation (PWM) and pulse amplitude modulation (PAM) functions, enabling efficient control of drive current and luminance through a simplified circuit structure, supporting smaller pitches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional PHM drive circuit is used, then hybrid drive modulation is achieved, but the circuit occupies excessive layout space and cannot accommodate smaller pitches
Solution Approach 1:
The patent merges the PWM drive transistor and PAM drive transistor into a single integrated structure where one transistor performs both pulse width modulation and pulse amplitude modulation functions. This consolidation eliminates the need for separate transistor circuits for each drive mode, significantly reducing the overall circuit area while maintaining hybrid drive modulation capability.
Solution Approach 2:
The drive transistor is designed with multi-functionality to operate in both PWM and PAM modes. By configuring the transistor with multiple gates and appropriate control signals, a single transistor can achieve the functions previously requiring separate dedicated transistors, thereby reducing layout space and supporting smaller pitch requirements.
2Adaptability or versatility
If more transistors are added to achieve PHM drive, then drive functionality is improved, but the circuit complexity and space occupation increase
Solution Approach 1:
The patent combines multiple drive functions into a single transistor structure. Instead of using separate PWM and PAM transistors that would increase device complexity, the invention integrates both functionalities into one transistor by appropriately configuring its gates and control mechanisms, thereby simplifying the overall circuit structure.
Solution Approach 2:
The drive transistor is designed as a universal component capable of operating in multiple drive modes (PWM and PAM). This multi-functional design eliminates the need for additional specialized transistors, reducing device complexity while maintaining comprehensive drive functionality for hybrid modulation.
Data Source
AI summary
Disclosed are a pixel drive circuit and a timing control method therefor, and a display panel. The pixel drive circuit includes: a drive module; a pulse modulation module configured to be enabled based on any one of a first scanning signal and a second scanning signal, convert a data drive signal into a modulation signal of a drive current, and provide the modulation signal to the drive module; and a light-emitting device. The drive module is connected to the pulse modulation module and the light-emitting device, to control on-off of the drive current based on the modulation signal to control the light-emitting device to emit light. The pulse modulation module includes a dual-gate transistor.