Video Signal Processing Apparatus Reducing Data Access Load
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Solution Overview
Problem
The increasing data rate for accessing frame memories in video signal processing devices complicates signal processing, leading to heat generation and increased costs, while existing technologies struggle to simplify this process without adversely affecting the overdrive operation of liquid crystal display devices.
Innovation Solution
A video signal processing apparatus and method that includes a frame rate converter to write and read video signals with different bit depths, an RGB converter to form composite data, and an overdrive processing unit to correct signal amplitudes, simplifying signal processing and ensuring adequate overdriving of liquid crystal display devices without interfering with the overdrive operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the data rate for accessing frame memories is increased to support higher bit depth video signals, then image quality is improved, but signal processing complexity increases leading to heat generation and cost increase
Solution Approach 1:
The patent changes the bit depth parameter of video signals from high (10-bit) to low (8-bit) when writing to frame memory, then reconstructs the high bit depth by combining multiple low bit depth signals. This parameter transformation reduces the data rate and simplifies signal processing while maintaining image quality through computational reconstruction.
2Device complexity
If signal processing is simplified to reduce heat generation and cost, then device complexity is reduced, but the overdrive operation of liquid crystal display devices may be adversely affected
Solution Approach 1:
The patent performs preliminary processing by writing video signals to frame memory at reduced bit depth, then reconstructs the full-resolution high bit depth signal by combining multiple frames. This preliminary low-bit-depth storage followed by reconstruction ensures that the overdrive operation receives proper high-quality signals while the intermediate processing stages remain simple and low-power.
Data Source
AI summary
A first RGB converter is configured to convert a luminance signal and a color difference signal of a first frame signal to a first RGB signal. The first frame signal is a current frame having a first number of bits. A second RGB converter is configured to place at least one lower bit of the first frame signal on the least significant bit side of a second frame signal to form composite data having the first number of bits and to convert the composite data to a second RGB signal. The second frame signal is a previous frame having a second number of bits composed of upper bits of the first number of bits other than at least one lower bit. An overdrive processing unit is configured to correct an amplitude of the first RGB signal corresponding to the difference between the first and second RGB signals.