Interlaced Scan Signal Transmission for Display Power Reduction
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Solution Overview
Problem
Current display devices face challenges in reducing power consumption, particularly in the transmission of scan and light emission signals to pixels, which leads to inefficiencies in energy usage.
Innovation Solution
The proposed display device employs a configuration where scan signals are transmitted in an interlace manner with a turn-on level, and light emission signals are maintained in a turn-off level for extended periods, with specific timing controls for red, blue, and green pixels to minimize signal swings and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If scan signals are transmitted continuously to all pixel rows in progressive manner, then all pixels can be updated uniformly, but power consumption increases due to frequent signal swings
Solution Approach 1:
The pixel array is divided into multiple scan lines (first scan line, second scan line, etc.) that are scanned alternately in an interlaced manner. Instead of updating all pixels in sequence on a single scan line, the patent segments the scanning process across multiple lines, updating odd-numbered lines first then even-numbered lines, which reduces the frequency of signal swings on individual lines and thereby reduces power consumption.
Solution Approach 2:
The patent implements periodic scanning by alternately updating different scan lines in a cyclic pattern. The scan driver periodically switches between updating the first scan line and the second scan line, creating a rhythmic, periodic action that reduces the continuous signal swings required in progressive scanning, thus lowering power consumption while maintaining uniform pixel updates over time.
2Use of energy by moving object
If light emission signals are maintained at turn-off level for extended periods, then power consumption is reduced, but pixel brightness control becomes less responsive
Solution Approach 1:
The pixel circuit includes a storage capacitor that is charged in advance during the scan period to store the required light emission voltage. This preliminary charging action allows the pixel to maintain its brightness state without requiring continuous signal swings, enabling the light emission signal to be held at a stable level (reducing power consumption) while still responding quickly when update is needed.
Solution Approach 2:
The patent dynamically adjusts the scanning pattern and signal timing based on the display refresh requirements. The scan driver dynamically switches between different scan lines in an interlaced pattern, and the light emission driver dynamically controls the timing of light emission signals, allowing the system to optimize between power savings and response speed depending on the specific display content and refresh rate requirements.
Data Source
AI summary
A display device includes: a plurality of pixels arranged in a row direction and a column direction; a data driver configured to transmit a data signal to the plurality of pixels through a plurality of data lines; a scan driver configured to transmit a scan signal to the plurality of pixels through a plurality of scan lines; and a light emission driver configured to transmit a light emission signal to the plurality of pixels through a plurality of light emission lines, wherein each of the scan lines and the light emission lines is connected to the pixels arranged in the row direction among the plurality of pixels, the data lines are connected to the pixels arranged in the column direction among the plurality of pixels, and the scan driver is configured to transmit the scan signal of a turn-on level to the pixels in an interlace manner.