Variable Display Periods Disperse Voltage Noise
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Solution Overview
Problem
Existing display devices face issues with noise production due to periodic changes in power source voltage, leading to audible acoustic noise, which is not effectively mitigated by current technologies.
Innovation Solution
The display device employs a variable display period and blanking period structure, dispersing the frequency of voltage changes to reduce periodicity and noise production, and incorporates a touch detection system using a mutual detection method with a common electrode and detection electrode to detect touch proximity and position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a fixed display period and blanking period structure is used, then the display operation is simple and stable, but periodic voltage changes produce audible acoustic noise
Solution Approach 1:
The patent applies dynamics by making the display period and blanking period variable rather than fixed. The controller dynamically adjusts the lengths of display periods and blanking periods to disperse voltage change frequencies, preventing concentrated periodic noise while maintaining display functionality.
Solution Approach 2:
The patent changes the temporal parameters of the display operation by varying the lengths of display periods and blanking periods. This parameter variation disperses the frequency of voltage changes occurring in signal lines, thereby reducing the intensity of noise frequencies and eliminating audible acoustic noise.
2Object-affected harmful factors
If variable display periods and blanking periods are used, then acoustic noise is reduced, but the control complexity increases
Solution Approach 1:
The patent segments the display operation into multiple display periods and blanking periods with different length combinations. By dividing the overall display timeframe into distinct segments with varied durations, the controller disperses voltage change frequencies across different time intervals, reducing noise frequency intensity.
Data Source
AI summary
According to one embodiment, a display device includes a plurality of display elements arranged in a matrix, a plurality of scanning lines, a plurality of signal lines, and a controller configured to control display by sequentially supplying an image signal and a control signal to the plurality of signal lines and the plurality of scanning lines, respectively, wherein the controller repeats a display period in which the display is controlled and a display blanking period in which the display is paused to display a frame image, and at least two types of display periods with different lengths are used when a frame image is displayed.