Display Device Low-Frequency Driving Power Reduction
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Solution Overview
Problem
Existing display devices performing low-frequency driving struggle to further reduce power consumption, as current methods only stop scanning line driving during pause periods without optimizing the frequency of light-emission control lines.
Innovation Solution
A display device configuration that includes scanning lines, data lines, and light-emission control lines, driven by separate circuits, with a display control circuit that classifies the frame period into scanning and pause periods, stopping the first clock signal during the pause period and reducing the frequency of the second clock signal, thereby minimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If low-frequency driving is implemented by stopping scanning line driving during pause period, then power consumption is reduced, but light-emission control lines continue to operate at normal frequency causing unnecessary power consumption
Solution Approach 1:
The patent applies periodic action by making the light-emission control lines operate at a lower frequency during the pause period compared to the scanning period. The second clock signal that controls light-emission control lines has its frequency reduced during pause periods, creating a periodic operation pattern that matches the scanning period/pause period structure, thereby reducing power consumption while maintaining necessary display functions.
Solution Approach 2:
The patent changes the frequency parameter of the second clock signal based on the operating period. During scanning periods, the second clock signal operates at a higher frequency to enable normal light emission control, while during pause periods, its frequency is reduced to minimize power consumption. This dynamic parameter adjustment resolves the contradiction between maintaining productivity and reducing energy loss.
2Loss of energy
If the frequency of the second clock signal is reduced during pause period, then power consumption decreases, but display refresh capability is reduced
Solution Approach 1:
The patent implements periodic action by alternating between high-frequency operation during scanning periods (maintaining display refresh capability) and low-frequency operation during pause periods (reducing power consumption). The second clock signal's frequency is dynamically adjusted to match the periodic structure of scanning and pause periods, allowing the system to achieve both fast refresh rates when needed and low power consumption during static display periods.
Solution Approach 2:
The patent applies dynamics by making the frequency of the second clock signal variable rather than fixed. The frequency adapts dynamically based on whether the system is in a scanning period or pause period, allowing optimal performance characteristics for each operational phase. This dynamic adjustment enables the system to balance between refresh capability and power consumption efficiently.
Data Source
AI summary
A display device includes: a plurality of scanning lines; a plurality of data lines; a plurality of light-emission control lines; a plurality of pixel circuits each including a light-emitting element; a scanning line drive circuit that drives the scanning lines based on a first clock signal; a data line drive circuit that drives the data lines; a light-emission control line drive circuit that drives the light-emission control lines based on a second clock signal; and a display control circuit that outputs at least the first and second clock signals. The display control circuit classifies a frame period into a scanning period and a pause period, and during the pause period, the display control circuit stops the first clock signal and makes a frequency of the second clock signal lower than that during the scanning period. This further reduces the power consumption of the display device that performs low-frequency driving.