Driving Device Code Mapping Circuit Instantaneous Current Reduction
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Solution Overview
Problem
Traditional panel driving chips experience issues with large instantaneous currents during signal transitions, leading to temperature rises and reliability concerns due to simultaneous switching of level shifters across all source driving channels.
Innovation Solution
The implementation of a driving device with separate code mapping circuits and source driving channels, each using distinct code-to-code and code-to-voltage mapping relations to reduce the number of transitional bits in digital data, thereby minimizing instantaneous currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If all source driving channels transmit input signals faithfully to level shifters using the same mapping relation, then signal transmission accuracy is maintained, but large instantaneous currents occur simultaneously on all level shifters causing temperature rise and voltage disturbance
Solution Approach 1:
The patent divides the source driving channels into multiple groups, where each group uses a different code-to-code mapping relation. This segmentation prevents all level shifters from switching simultaneously, as different groups transition at different times. The segmentation maintains signal accuracy within each group while distributing the current load across time, thereby preventing large instantaneous currents and improving chip reliability.
Solution Approach 2:
The patent implements periodic switching of code mapping relations across different source driving channel groups. By cycling through different mapping relations in a periodic manner, the system ensures that level shifters in different groups switch at staggered intervals. This periodic action distributes the switching current over time, preventing simultaneous current surges while maintaining overall signal transmission accuracy.
2Reliability
If different code-to-code mapping relations are used in different source driving channels, then simultaneous instantaneous currents are reduced, but device complexity increases due to multiple mapping circuits
Solution Approach 1:
The patent designs the code mapping circuits to be functionally identical in structure, with each circuit capable of implementing different code-to-code mapping relations. This universal design allows the same circuit architecture to serve multiple groups of source driving channels, reducing overall device complexity. The circuits can be configured with different mapping relations through programming or configuration, rather than requiring physically different circuit designs for each group.
Data Source
AI summary
A driving device is provided. The driving device includes a first code mapping circuit, a first source driving channel, a second code mapping circuit and a second source driving channel. The first code mapping circuit converts a first input code in input data into a first intermediate code according to a first code-to-code mapping relation. The first source driving channel converts the first intermediate code into a first analog voltage according to a first code-to-voltage mapping relation. The second code mapping circuit converts a second input code in the input data into a second intennediate code according to a second code-to-code mapping relation which is different from the first code-to-code mapping relation. The second source driving channel converts the second intermediate code into a second analog voltage according to a second code-to-voltage mapping relation which is different from the first code-to-voltage mapping relation.