Sub-Frame Luminance Driving for Low-Power LED Displays
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Solution Overview
Problem
Existing display devices face challenges in reducing power consumption, achieving high luminance, and preventing transistor deterioration when implementing high luminance, particularly in light emitting diode-based displays.
Innovation Solution
A display device design that includes a light emitting device with a first and second electrode, connected to column and row lines, and driven by a driver to control emission in sub-frame periods with varying luminance, using voltage control and emission control transistors to manage luminance levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If voltage is directly supplied to the light emitting device to achieve high luminance, then luminance is improved, but power consumption increases and transistor deterioration occurs
Solution Approach 1:
The frame period is divided into multiple sub-frame periods, with each sub-frame period displaying a different luminance level. This segmentation allows the display to achieve high luminance in specific sub-frames while using lower luminance in others, thereby reducing overall power consumption while still providing high luminance capability when needed.
Solution Approach 2:
The light emitting device operates in periodic sub-frame periods with varying luminance levels rather than continuous high luminance. This periodic variation in luminance output reduces the average power consumption while maintaining the capability to display high luminance content when required.
2Illumination intensity
If voltage is directly supplied to the light emitting device to achieve high luminance, then luminance is improved, but transistor deterioration occurs
Solution Approach 1:
By segmenting the display into multiple sub-frame periods with different luminance levels, the invention reduces the cumulative stress on transistors. Transistors are activated only during specific sub-frames when high luminance is needed, rather than continuously, which reduces deterioration and improves reliability.
Solution Approach 2:
The periodic activation of light emitting devices in specific sub-frame periods rather than continuous operation reduces the cumulative stress and heat generation in transistors, thereby reducing deterioration and improving device reliability and lifespan.
3Use of energy by moving object
If multiple sub-frame periods with different luminances are used, then power consumption is reduced, but device complexity increases
Solution Approach 1:
The driver is designed with segmentation capability to independently control multiple sub-frame periods. This segmentation approach, while adding some complexity, is implemented through systematic addressing schemes and control logic that manage the complexity in an organized manner, enabling power savings through temporal multiplexing.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design reduces power consumption, enables high luminance, and prevents transistor deterioration by directly supplying voltage to the light emitting device, enhancing display performance.
Implementation Method 1
a light emitting device including a first electrode and a second electrode
Implementation Method 2
the light emitting device emits light with a first luminance in a first sub-frame period
Data Source
AI summary
A display device and a driving method of the same are disclosed, and more specifically, may provide a display device including a light emitting device including a first electrode and a second electrode, a column line electrically connected to the first electrode, a row line electrically connected to the second electrode, and a driver electrically connected to the column line and the row line, and configured to control an emission of the light emitting device in each of a plurality of sub-frame periods, wherein the light emitting device emits light with a first luminance in a first sub-frame period, wherein the light emitting device emits light with a second luminance different from the first luminance in a second sub-frame period different from the first sub-frame period, and wherein the first luminance is brighter than the second luminance, thereby providing a display device capable of low power consumption.