Display Backlight Driving Frequency Control for Image Sharpness
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Solution Overview
Problem
Image display apparatuses with liquid crystal display panels face challenges in improving image sharpness and reducing dual image display due to limitations in backlight driving techniques, particularly when using switching control signals with variable amplitude.
Innovation Solution
An image display apparatus that includes a display panel, multiple light sources, switching elements, and a processor that outputs a switching control signal with variable amplitude, controlling the driving frequency of the light sources to be higher than the vertical synchronization frequency and adjusting the switching control signal levels to improve image sharpness and reduce dual image display by matching the light output to the liquid crystal response speed and luminance levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the light source is driven at the vertical synchronization frequency, then the control is simple and synchronized with the panel, but the image sharpness is insufficient and dual image display occurs
Solution Approach 1:
The patent applies dynamics by making the light source driving frequency variable rather than fixed. The processor dynamically adjusts the driving frequency of the light source to be higher than the vertical synchronization frequency of the display panel, allowing the system to optimize for image sharpness while maintaining synchronization control. This dynamic frequency adjustment resolves the contradiction by enabling higher precision image display without permanently increasing system complexity.
2Illumination intensity
If the switching control signal has variable amplitude, then the light output can be adjusted to match image content, but dual image display and reduced sharpness occur
Solution Approach 1:
The patent applies parameter changes by modifying both the frequency and amplitude parameters of the switching control signal. The processor changes the driving frequency to be higher than the vertical synchronization frequency and simultaneously adjusts the amplitude of the switching control signal. This coordinated parameter adjustment allows the system to maintain sharp image display while enabling flexible light output adjustment to match different image content requirements.
Data Source
AI summary
The present disclosure relates to an image display apparatus. The image display apparatus according to an embodiment of the present disclosure includes a display panel; a plurality of light sources configured to output light to the display panel; a plurality of switching elements configured to switch the light sources, respectively; and a processor configured to output a switching control signal having variable amplitude to the switching element, wherein the processor controls a driving frequency of the light source to be a second frequency higher than a first frequency corresponding to a vertical synchronization signal of the panel. Thus, the sharpness of the image can be improved.