Scanning Backlight Controller for LCD Motion Blur Reduction
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Solution Overview
Problem
Liquid crystal display (LCD) devices experience motion blur when displaying moving images due to the retention characteristics of liquid crystals, and existing scanning backlight driving technologies reduce brightness to mitigate this issue, which is not optimal.
Innovation Solution
A liquid crystal display device with a scanning backlight controller that generates a pulse width modulation (PWM) signal to control the turn-on and turn-off times of backlight sources and adjusts the driving current in inverse proportion to the duty ratio of the PWM signal, minimizing brightness reduction while reducing motion blur.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If scanning backlight driving is used to reduce motion blur, then motion blur is reduced, but brightness is reduced
Solution Approach 1:
The patent changes the parameter of backlight driving mode from continuous to scanning (sequential) activation. By controlling the turn-on and turn-off timing of backlight sources corresponding to different scan lines, the patent achieves impulsive driving effect that reduces motion blur while maintaining perceived brightness through temporal and spatial parameter optimization
Solution Approach 2:
The patent implements periodic scanning backlight driving where backlight sources are activated in sequential periods corresponding to different scan lines. Each backlight source is turned on only during its corresponding scan period and turned off during other periods, creating a periodic activation pattern that reduces motion blur while maintaining overall brightness through the scanning effect
Data Source
AI summary
A liquid crystal display (LCD) device and method of the driving the same is disclosed. According to an embodiment of the present invention, an LCD device includes a liquid crystal display panel; a plurality of backlight sources configured to provide light to the liquid crystal display panel; a scanning backlight controller configured to generate a pulse width modulation (PWM) signal for controlling a turn-on time and a turn-off time of the light sources and a current control signal for controlling a driving current of the backlight light sources; and a plurality of light source drivers configured to turn on and off the backlight sources in response to the PWM signal and control the driving current of the backlight sources in response to the current control signal.