Backlight Driving Circuit Black Frame Insertion
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Solution Overview
Problem
Active matrix mini LED liquid crystal displays face the challenge of trailing images due to the inability to insert black frames effectively, as the backlight is turned on line by line, leading to suboptimal image quality.
Innovation Solution
A backlight driving circuit is designed with a light emitting control module that controls the light emitting loop to turn on or off based on an enable signal, allowing for black frame insertion during the display process, thereby improving image quality and reducing trailing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the backlight is turned on line by line by scanning, then the backlight can be controlled to turn on, but the backlight cannot insert black frames, causing trailing problem
Solution Approach 1:
The patent divides the backlight control into two independent parts: a scanning control mechanism (for line-by-line turning on) and a black frame insertion control mechanism (using enable signal and light emitting control transistor). This segmentation allows the backlight to simultaneously support both scanning operation and black frame insertion, resolving the contradiction between operational capability and image quality.
2Speed
If the backlight turns on before liquid crystals reach steady state, then the backlight can illuminate early, but human eyes perceive trailing problem
Solution Approach 1:
The patent implements preliminary action by controlling the liquid crystal deflection to reach steady state before activating the backlight through the enable signal. The black frame insertion mechanism ensures the backlight remains off during the scan period, and only turns on during the display period after liquid crystals have stabilized, thereby eliminating trailing perception while maintaining appropriate illumination timing.
3Reliability
If black frame insertion is implemented, then trailing problem is reduced, but the circuit complexity increases with additional control modules
Solution Approach 1:
The patent achieves multi-functionality by designing the light emitting control transistor to serve dual purposes: controlling the backlight during scanning operations and enabling black frame insertion. The enable signal and display period configuration allow the same circuit components to manage both normal display mode and black frame insertion mode, reducing circuit complexity while maintaining image quality.
Data Source
AI summary
The present disclosure provides a backlight driving circuit and a liquid crystal display device. The backlight driving circuit of the present disclosure adds a light emitting control module to control a light emitting device to turn on or off, thereby controlling a backlight to turn on or off, realizing a function of black insertion frame by frame of the backlight of the liquid crystal display device, satisfying a BFI function requirement. In addition, it improves product quality. In addition, the liquid crystal display device of the present disclosure lights up the backlight after a deflection of a liquid crystal layer is stabilized and displays normally, and therefore, a problem of trailing when displaying images can be decreased.