OLED Frame Memory and Scan Driver for Power Management
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Solution Overview
Problem
Organic light emitting displays face high power consumption and image quality issues due to the significant current required for high luminance, which puts a heavy load on the power supply unit and can lead to inefficient energy use and reduced contrast ratios.
Innovation Solution
The implementation of a frame memory system that stores image signals from previous and current frames, a luminance controller to generate frame data by summing unchanged and changed signal portions, and a scan driver that controls pulse widths of light emitting control signals based on the frame data to manage current flow and luminance levels, thereby reducing power consumption and enhancing image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a large amount of current flows in the display unit to display an image with high luminance, then the luminance is improved, but the power consumption increases and a significant load is applied to the power supply unit
Solution Approach 1:
The patent applies periodic action by controlling the light emitting control signal to be activated only during specific time periods when image signals are actually displayed, rather than continuously. The scan driver activates the light emitting control signal in synchronization with the scan signals only when corresponding image signals are present, thereby reducing overall power consumption while maintaining required luminance during active display periods
Solution Approach 2:
The patent implements dynamics by making the light emitting control signal width variable based on the presence and characteristics of image signals. The scan driver dynamically adjusts the pulse width of the light emitting control signal according to the frame data from the luminance controller, optimizing the balance between luminance output and power consumption in real-time
2Illumination intensity
If a large amount of current flows in the display unit to display an image with high luminance, then the luminance is improved, but the contrast ratio deteriorates
Solution Approach 1:
The patent implements feedback through the luminance controller that receives frame data information and uses it to regulate the light emitting control signal width. The system monitors the image signal characteristics and adjusts the light emitting duration accordingly, ensuring optimal contrast ratio is maintained while achieving the required luminance levels through precise timing control
3Illumination intensity
If the power supply unit is designed with high output current capability to support high luminance display, then the luminance is improved, but the device complexity increases
Solution Approach 1:
The patent applies partial action by providing power supply capability that exceeds immediate needs only when necessary, rather than continuously operating at maximum capacity. The power supply unit is designed with high output current capability but the scan driver selectively activates high current draw only during specific frames or time periods when high luminance is required, allowing the power supply to be sized for peak performance while operating at lower levels during normal conditions
Solution Approach 2:
The patent implements preliminary action through the frame memory and luminance controller that prepare and analyze image signal data before it reaches the scan driver. By pre-processing the image signals to determine which frames require high luminance output, the system can proactively adjust power delivery requirements, allowing the power supply unit to be optimized for peak performance without continuously operating at high capacity
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
This approach reduces power consumption by limiting current flow and improving contrast ratios by controlling light emitting times and luminance levels, allowing for more efficient operation of the organic light emitting display without the need for high-output power supply units.
Implementation Method 1
An organic light emitting display displays an image by using organic light emitting diodes (OLEDs) to generate light by the recombination of electrons and holes
Data Source
AI summary
An organic light emitting display and a method for driving the same. An organic light emitting display includes: a frame memory having a first portion configured to store a first portion of image signals that is the same in an n−1th frame and an nth frame, and a second portion configured to store a second portion of the image signals that is different in the n−1th frame and the nth frame; a storing unit for storing the first portion of the image signals; a luminance controller for summing the second portion of the image signals and the first portion of the image signals stored in the storing unit to generate a frame data; and a scan driver for supplying light emitting control signals with a controlled pulse width according to a magnitude of the frame data.