Display Driver IC EMI Reduction via Output Enable Toggling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High-resolution and high-frequency display driver integrated circuits face challenges in maintaining electro-magnetic susceptibility (EMI) characteristics due to the current components used for controlling output switches.
Innovation Solution
The display driver integrated circuit selectively performs high-rate driving and improves EMI characteristics by toggling an output enable signal based on change values in image data, allowing for efficient power management and reduced electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-rate driving techniques are used to achieve high-resolution and high-frequency display, then display performance is improved, but electro-magnetic susceptibility (EMI) characteristics are degraded
Solution Approach 1:
The patent implements dynamic switching between high-rate driving mode and normal driving mode based on image data characteristics. The timing controller dynamically adjusts the output enable signal toggling according to the change values calculated from sequential image data, enabling the system to adapt its driving rate to actual display needs rather than operating continuously at maximum rate.
Solution Approach 2:
The patent changes the driving parameters (output enable signal toggling) based on calculated change values from image data. By monitoring the magnitude of changes in sequential image frames and adjusting the output enable signal accordingly, the system modifies its operational parameters to balance performance and EMI characteristics.
2Speed
If output switch control method is used for high-rate operations, then driving rate is improved, but current component for controlling output switch degrades EMI characteristic
Solution Approach 1:
The patent implements periodic toggling of the output enable signal based on calculated change values from sequential image data. Instead of continuous high-rate switching, the system periodically activates high-rate driving only when image data changes warrant it, creating a pulsed rather than continuous switching pattern that reduces EMI while maintaining necessary display performance.
Solution Approach 2:
The patent applies high-rate driving partially rather than continuously. By calculating change values between sequential image frames and only toggling the output enable signal when changes exceed certain thresholds, the system uses high-rate driving only when necessary (partial action) rather than maintaining it constantly (excessive action), thereby reducing overall EMI exposure.
Data Source
AI summary
The present disclosure relates to a display driver integrated circuit and a display device. An example of the display driver integrated circuit includes a source driver and a timing controller. The source driver is configured to output a data voltage based on an image data to a first source line and a second source line. The timing controller is configured to receive first data and second data sequentially input to a first source channel that corresponds to the first source line, receive third data and fourth data sequentially input to a second source channel that corresponds to the second source line, perform an operation on the first data and the second data to generate a first change value, perform an operation on the third data and the fourth data to generate a second change value, and based on the first change value and the second change value, determine whether to toggle an output enable signal on an output of the second data in the first source line and an output of the fourth data in the second source line.