Display Substrate Clock Synchronization for EMI Reduction
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Solution Overview
Problem
High-resolution display panels using parallel processing and spread spectrum processing face challenges in synchronizing image processing blocks, leading to difficulties in reducing unnecessary radiation and maintaining waveform quality due to differences in clock numbers and synchronization issues.
Innovation Solution
A substrate for a display apparatus that includes a clock signal generator producing spread spectrum clocks, which are divided and transmitted to multiple image processing circuits to ensure synchronization, using a signal divider and transmitter to synchronize the clocks and adjust wiring lengths to equalize transmission times, thereby reducing unnecessary radiation and maintaining waveform quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If spread spectrum processing is applied to operation clocks to reduce unnecessary radiation, then electromagnetic interference is reduced, but synchronization among image processing blocks becomes very difficult
Solution Approach 1:
The patent segments the spread spectrum clock signal generation into two parts: a master clock signal generator that produces the base spread spectrum clock, and individual image processing blocks that each generate their own spread spectrum modulation based on this master clock. This segmentation allows each block to have synchronized modulation characteristics while maintaining the EMI reduction benefits of spread spectrum processing.
Solution Approach 2:
The patent introduces a master clock signal as an intermediary that mediates between the need for EMI reduction and synchronization. The master spread spectrum clock signal serves as a common reference that all image processing blocks use to synchronize their operations, enabling both EMI reduction and reliable synchronization.
2Object-affected harmful factors
If spread spectrum processing is applied to operation clocks of image processing circuits, then electromagnetic interference is reduced, but differences of clock numbers occur between circuits
Solution Approach 1:
The patent changes the parameter control approach by having all image processing blocks derive their spread spectrum modulation parameters from a common master clock signal. This ensures that while each block independently processes data, their clock characteristics remain consistent, eliminating clock number differences between circuits.
3Reliability
If demodulation of spread spectrum clocks is performed in each image processing block, then synchronization among blocks is achieved, but the effect of countermeasures against unnecessary radiation drastically reduces
Solution Approach 1:
The patent inverts the conventional approach by not demodulating the spread spectrum clock in each block. Instead, it uses the spread spectrum clock directly as a synchronization reference, allowing blocks to maintain synchronization through shared clock characteristics while preserving the EMI reduction effect of the un-demodulated spread spectrum signal.
Data Source
AI summary
A substrate includes first and second image processing circuits performing image processing of an image displayed by a display apparatus, a clock signal generator generating a plurality of spread spectrum clocks, which area plurality of clock signals subjected to spread spectrum processing, and a transmitter transmitting a first spread spectrum clock, which is one of the plurality of spread spectrum clocks, to the first image processing circuit and a second spread spectrum clock, which is one of the plurality of spread spectrum clocks to the second image processing circuit. The clock signal generator includes a signal generator that generates a clock signal subjected to the spread spectrum processing and a signal divider that divides the clock signal into the plurality of spread spectrum clocks. The first and second image processing circuits synchronize with each other in accordance with the first and second spread spectrum clocks.