Display Apparatus Backlight Control for High Frame Rate Memory Reduction
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Solution Overview
Problem
Display apparatuses using liquid crystal panels face challenges in increasing frame frequency without increasing memory requirements or power consumption, particularly when combining frame interpolation with local illumination, which leads to increased circuit size, manufacturing costs, and delayed image display.
Innovation Solution
A display apparatus comprising a backlight unit, image signal receiver, local illumination calculation unit, frame interpolator, and pixel adjuster, which calculates and adjusts light amounts and transmittance to generate sub-frames, allowing for increased frame frequency without additional memory or power consumption, by controlling light sources based on frame brightness and interpolating sub-frames using motion vectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If frame interpolation method is used to increase frame frequency, then after-images are removed and moving images become focused, but the amount of information to be maintained increases, leading to increased memory requirements
Solution Approach 1:
The patent segments the frame information into two types: full frame data stored in frame memory and sub-frame data generated through interpolation. The frame memory only stores complete frames while sub-frames are generated on-demand from stored frame data, reducing the total memory burden while maintaining high frame frequency through the combination of stored frames and interpolated sub-frames
2Use of energy by stationary object
If local illumination scheme is implemented by dividing backlight into multiple areas, then power consumption is reduced, but the amount of information to be maintained increases, leading to increased memory requirements
Solution Approach 1:
The patent performs preliminary calculation of light amounts for each backlight section based on frame brightness data before the actual display. The light amount calculation unit pre-computes the required illumination levels for each section, allowing the backlight controller to efficiently adjust illumination without requiring additional memory for real-time storage of illumination parameters during frame display
3Productivity
If both frame interpolation and local illumination are combined, then frame frequency increases and power consumption reduces, but the amount of information to be maintained increases significantly, leading to increased memory requirements
Solution Approach 1:
The patent merges the frame interpolation process with the local illumination calculation by using the same frame brightness data for both purposes. The light amount calculation unit utilizes the frame data already available for interpolation to simultaneously compute illumination parameters, eliminating the need for separate data storage and reducing overall memory requirements while achieving both frame frequency enhancement and power savings
4Productivity
If frame frequency is increased to remove after-images, then image quality improves, but display time is delayed, causing synchronization issues with sound output
Solution Approach 1:
The patent implements dynamic frame generation where sub-frames are interpolated and generated in real-time based on motion vectors between consecutive frames. This dynamic approach allows the system to maintain high frame frequency for improved image quality while minimizing display delay by generating sub-frames on-demand rather than pre-storing them, thus maintaining synchronization with audio output
Data Source
AI summary
Disclosed are a display apparatus and a method of driving the same. An image signal receiver sequentially outputs frames for image display. A local illumination calculation unit displays an image on a display unit based on the frames and calculates light emission amount of a light source provided for each section of a backlight unit. A frame interpolator generates sub-frames based on the frames and outputs the sub-frames and the frames. A pixel adjuster adjusts light transmittance of each pixel according to the brightness of each pixel and the amount of the light emitted from each section which is calculated by the local illumination calculation unit when the image is displayed based on the frames and the sub-frames sequentially output from a frame interpolator. Local illumination is realized without increasing the number of memory devices while a frame frequency is increased.