Display Interface Bit Depth Detection via CDR Training
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Solution Overview
Problem
Existing interfaces like LVDS struggle with increased data transmission requirements in high-resolution displays, leading to electromagnetic interference and excessive power consumption, and require additional option pins for data bit depth detection.
Innovation Solution
A method and interface device that automatically detect data bit depth using a clock data recovery (CDR) training pattern signal and alignment training pattern signal, eliminating the need for separate option pins by counting bits of pixel data or clock cycles to determine the data bit depth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If LVDS interface is used for high resolution displays with increased data transmission, then data transmission capability is improved, but electromagnetic interference increases
Solution Approach 1:
The patent replaces the traditional LVDS mechanical/electrical interface system with an optical communication system. Optical signals transmit data through light rather than electrical signals, eliminating electromagnetic interference while maintaining high data transmission capability for high resolution displays
2Reliability
If LVDS interface transmits clock signals along with data, then synchronization is achieved, but electromagnetic interference increases
Solution Approach 1:
The patent substitutes electrical clock signal transmission with optical signal transmission. The optical interface transmits both data and synchronization information through light signals, achieving reliable synchronization without generating electromagnetic interference from clock signals
Solution Approach 2:
The optical interface integrates multiple functions into a single transmission channel, combining data transmission and clock synchronization in one optical link, eliminating the need for separate clock signal lines that would generate electromagnetic interference
3Measurement precision
If separate option terminals are added for data bit depth detection, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent extracts the data bit depth detection function from the physical connection layer and implements it at the signal processing layer. By analyzing the characteristics of received optical signals, the system determines data bit depth without requiring separate physical detection terminals, reducing device complexity while maintaining detection accuracy
Solution Approach 2:
The optical interface serves multiple functions simultaneously: data transmission, synchronization, and data bit depth detection. The receiving end analyzes the incoming optical signal characteristics to automatically determine the data bit depth, eliminating the need for separate option terminals while maintaining accurate detection
Data Source
AI summary
A method of detecting a data bit depth and an interface device for a display device using the same are disclosed. The method includes confirming a physical connection between a transmitting terminal and a receiving terminal and then transmitting a clock data recovery (CDR) training pattern signal from the transmitting terminal to the receiving terminal, outputting clocks from a CDR circuit of the receiving terminal using the CDR training pattern signal, receiving an alignment training pattern signal subsequent to the CDR training pattern signal from the transmitting terminal to the receiving terminal, and counting bits of pixel data included in the alignment training pattern signal or the clocks and determining a data bit depth of input data based on a count result, in the interface receiving terminal.