Display Device RF Noise Dispersion via Clock Signal Alternation
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Solution Overview
Problem
Display devices face challenges in reducing radio frequency (RF) noise levels and power consumption due to the lack of effective methods for dispersing frequency components and preventing unnecessary data transmission.
Innovation Solution
The use of a timing controller that generates and transmits multiple clock signals with different frequencies, which are alternated periodically to the scan and data drivers, allowing for the dispersion of RF noise and reduction in power consumption by preventing unnecessary data transmission during vertical blank sections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If multiple clock signals with different frequencies are transmitted continuously to disperse RF noise, then RF noise dispersion is improved, but power consumption increases due to unnecessary data transmission
Solution Approach 1:
The timing controller alternates between transmitting multiple clock signals with different frequencies during active periods and halts transmission during vertical blank sections. This periodic action disperses RF noise frequency components during active transmission while preventing unnecessary data transmission during blank sections, thereby reducing power consumption.
Solution Approach 2:
The frame period is divided into active periods and vertical blank sections. During active periods, multiple clock signals are transmitted to disperse RF noise. During vertical blank sections, transmission is halted. This segmentation allows the system to achieve RF noise dispersion only when necessary, avoiding continuous transmission and reducing power consumption.
2Object-generated harmful factors
If multiple clock signals are used to disperse frequency components, then RF noise characteristics are improved, but device complexity increases
Solution Approach 1:
The timing controller dynamically switches between different clock signals with different frequencies during active periods and halts transmission during vertical blank sections. This dynamic operation allows the system to adaptively manage RF noise dispersion while simplifying the overall system architecture by using a single timing controller that performs multiple functions.
Data Source
AI summary
A display device includes a timing controller configured to receive an image data signal and a plurality of clock signals and to generate a scan clock signal and a plurality of data clock signals, a scan driver configured to receive the scan clock signal, and a data driver configured to receive the data clock signals. The clock signals include first to nth clock signals, and the data clock signals include first to nth data clock signals generated from the first to nth clock signals (n≥2), the first to nth clock signals having differing frequencies and the first to nth data clock signals having differing frequencies. Whenever a predetermined number of frame periods has elapsed, the timing controller halts transmission of one of the first to nth data clock signals to the data driver, and begins transmission of another one of the first to nth data clock signals thereto.