Backlight Driving Method for Display Panel Black Frame Insertion
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Solution Overview
Problem
Virtual reality applications using liquid crystal displays suffer from image smear and vertigo due to visual persistence, which is not adequately addressed by existing methods that keep the backlight constantly on during line scan and liquid crystal response, leading to blurred motion images and eye discomfort.
Innovation Solution
A backlight driving method and device that generate a synchronous drive frame with a PWM light-adjusting signal not output during line scan time and active during liquid crystal stabilization time, implementing black frame insertion control to mitigate the inverting state of liquid crystals and improve image clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the backlight is kept constantly on during line scan and liquid crystal response, then the display maintains continuous illumination, but the image becomes blurred and causes eye discomfort due to visual persistence
Solution Approach 1:
The patent applies periodic action by controlling the backlight to turn off during line scan periods and turn on during display periods. This periodic switching creates black frames that interrupt the continuous illumination, allowing the liquid crystal molecules to complete their response cycle without causing image smear or eye discomfort from visual persistence.
Solution Approach 2:
The patent segments the display frame into two distinct time periods: a line scan period where the backlight is off, and a display period where the backlight is on. This temporal segmentation allows the liquid crystal driver chip to perform line scanning without backlight interference while maintaining image display during the active period.
2Manufacturing precision
If black frame insertion is implemented during line scan, then image clarity improves, but synchronization between backlight control and liquid crystal response must be precisely maintained
Solution Approach 1:
The patent merges the backlight control function with the liquid crystal driver chip by integrating the synchronous drive frame generation within the same device. This consolidation ensures that the backlight control signals are automatically synchronized with the liquid crystal response timing, eliminating the need for separate synchronization mechanisms while maintaining precise black frame insertion.
3Illumination intensity
If PWM light-adjusting signal is output continuously, then brightness control is maintained, but the inverting state of liquid crystals becomes visible causing discomfort
Solution Approach 1:
The patent applies periodic action by controlling the PWM light-adjusting signal to be output only during the display period and suppressed during the line scan period. This periodic modulation of the PWM signal ensures that brightness control is maintained when needed while preventing the liquid crystal inverting state from becoming visible during line scan transitions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces eye discomfort and enhances the realism and clarity of motion images by controlling the backlight to be off during line scan and response times, synchronizing with the liquid crystal driver chip to ensure effective black frame insertion and brightness adjustment.
Implementation Method 1
a PWM light-adjusting signal is not output in the first time region and the PWM light-adjusting signal is output in the second time region
Data Source
AI summary
A backlight driving method and device of a display panel, and a display panel are provided. The backlight driving method of a display panel includes generating a synchronous drive frame and performing black frame insertion control according to a synchronous drive frame, the synchronous drive frame includes a first time region and a second time region, in the synchronous drive frame, a PWM light-adjusting signal is not output in the first time region and the PWM light-adjusting signal is output in the second time region, the first time region corresponds to line scan time, and the second time region corresponds to liquid crystal stabilization time.