Scan Stage Masking Circuit for Display Crosstalk Reduction
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Solution Overview
Problem
Display devices face challenges in reducing power consumption and minimizing brightness differences between pixels, especially when displaying multiple images simultaneously, which can lead to increased power usage and decreased image quality due to crosstalk phenomena.
Innovation Solution
The electronic device incorporates a display panel with multiple scan stages, masking circuits, and transmission circuits, where the masking signal overlaps the scan signal to prevent carry signal output and maintain a low level, ensuring uniform brightness across pixel rows and reducing power consumption by adjusting driving frequencies between display areas based on image type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple images are displayed simultaneously on a single display device, then the versatility and functionality of the display device are improved, but the power consumption increases and brightness uniformity deteriorates due to crosstalk phenomena
Solution Approach 1:
The display panel is divided into multiple independent scan stages (first scan stage, second scan stage, etc.), each capable of displaying different images simultaneously. The masking circuits are also segmented and selectively activated for specific scan stages based on the image type being displayed, allowing independent control of power consumption for each segment.
Solution Approach 2:
The driving frequency of each scan stage is dynamically adjusted based on the image type. For still images, the frequency is reduced to minimize power consumption while maintaining image quality. For moving images, the frequency is increased to ensure proper display performance. This dynamic frequency adjustment resolves the contradiction between versatility and power consumption.
2Adaptability or versatility
If multiple images are displayed simultaneously on a single display device, then the versatility and functionality of the display device are improved, but brightness uniformity deteriorates due to crosstalk phenomena
Solution Approach 1:
Masking circuits are introduced to extract and eliminate the crosstalk signals that cause brightness non-uniformity. These masking circuits selectively mask the carry signals between scan stages, preventing the propagation of unwanted signals that would otherwise cause brightness differences between pixel rows displaying different image types.
3Device complexity
If scan stages are connected in sequence without masking circuits, then the device complexity is reduced, but brightness uniformity deteriorates due to crosstalk between stages
Solution Approach 1:
Masking circuits are introduced as intermediary components between scan stages to mediate the signal transmission. These masking circuits selectively block or allow carry signals based on the image type, preventing crosstalk while maintaining the overall simplicity of the sequential scan stage structure. The masking circuits act as mediators that resolve the conflict between simplicity and brightness uniformity.
4Reliability
If the driving frequency is increased for all scan stages, then the image quality for moving images is improved, but the power consumption increases
Solution Approach 1:
Different driving frequencies are applied to different scan stages based on the local requirements of the images being displayed. Scan stages displaying still images operate at lower frequencies to minimize power consumption, while scan stages displaying moving images operate at higher frequencies to maintain image quality. This localized frequency adjustment resolves the contradiction between reliability and energy consumption.
Data Source
AI summary
An electronic device includes a display panel including pixels respectively connected to scan lines, scan stages corresponding to the scan lines, where each of the scan stages receives a carry signal, and outputs a scan signal, masking circuits electrically connected to some of the scan stages, respectively, where each of the masking circuits outputs a masking carry signal in response to a masking signal and the scan signal, and transmission circuits electrically connected to others of the scan stages, respectively, where each of the transmission circuits outputs the scan signal output from a corresponding scan stage among the scan stages. A j-th (j is an integer greater than 1) scan stage among the scan stages receives one of the scan signal output from a (j−1)-th scan stage and the masking carry signal as the carry signal.