Pixel Drive Circuit With Pre-Charging for Fast Micro-LED Response
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Solution Overview
Problem
The existing display panels, particularly those using micro-LEDs, suffer from short service life and insensitive display response due to the light-emitting devices remaining connected to the power supply when turned off, leading to damage and reduced display effectiveness.
Innovation Solution
A drive circuit for pixel units is designed with a main control module, switch module, triggering module, pre-charging module, power supply unit, and pre-charging power supply unit, which ensures complete disconnection from the power supply when turned off and utilizes pre-charging to facilitate quick response upon reactivation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the light-emitting device maintains connection with the power supply when turned off, then the device can quickly resume operation, but the display panel service life is reduced due to damage accumulation
Solution Approach 1:
The patent applies preliminary action by pre-charging the light-emitting device before actual operation through a pre-charging module. This allows the device to be quickly ready for operation without maintaining continuous power connection, thus improving response speed while protecting the device during off periods by completely disconnecting it from the power supply to extend service life.
2Reliability
If the light-emitting device is completely disconnected from the power supply when turned off, then the service life is extended, but the response sensitivity when turning on again is reduced
Solution Approach 1:
The patent implements preliminary action by introducing a pre-charging module that charges the light-emitting device in advance during off periods. This ensures that when the device needs to be activated, it can do so quickly with pre-stored energy, thus maintaining high response sensitivity while still achieving complete disconnection from the main power supply to extend service life.
Solution Approach 2:
The patent uses an intermediary approach by introducing a pre-charging module as a mediator between the power supply and the light-emitting device. This module can connect the device to a pre-charging power supply for quick reactivation without requiring continuous connection to the main power supply, thus resolving the contradiction between complete disconnection for longevity and quick reactivation for responsiveness.
3Reliability
If additional power supplies such as negative power supply are prepared to apply reverse bias, then the light-emitting device life can be increased, but the power consumption and cost increase
Solution Approach 1:
The patent applies universality by designing a pre-charging module that can serve multiple functions: it can charge the light-emitting device, apply reverse bias protection, and work with the existing power supply system. This eliminates the need for additional dedicated negative power supplies while still achieving the protective effect, thus extending device life without increasing power supply complexity.
Solution Approach 2:
The pre-charging module acts as an intermediary that can provide reverse bias protection without requiring a separate negative power supply. It mediates between the existing power supply system and the light-emitting device, achieving protective functions using the available power sources, thus avoiding increased device complexity and cost.
Data Source
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AI summary
The present application relates to a drive circuit of a pixel unit, and a display panel. A switch module (300) of the drive circuit controls connection and disconnection between a light-emitting unit (100) and a pre-charging module (500) according to a line scanning signal transmitted by a main control module (200); a triggering module (400) controls connection and disconnection between a power supply unit (600) and the pre-charging module (500), as well as connection and disconnection between a pre-charging power supply unit (700) and the pre-charging module (500) according to the line scanning signal transmitted by the main control module (200) when the light-emitting unit (100) and the pre-charging module (500) are disconnected; and the light-emitting unit (100) performs, when the light-emitting unit (100) and the pre-charging module (500) are connected, luminescence display under control of a power supply voltage transmitted by the power supply unit (600) through the pre-charging module (500) and a pre-charging voltage generated when the pre-charging module (500) is connected to the pre-charging power supply unit (700).