OLED Luminance Controller Pulse Width Adjustment
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Solution Overview
Problem
Conventional organic light emitting displays face high power consumption and reduced contrast due to varying pixel luminance, leading to increased load on the power supply unit and decreased image quality.
Innovation Solution
An organic light emitting display system that includes a luminance controller to limit the electric current by controlling the number and width of pulses in the emission control signal based on the sum of input data, reducing power consumption and enhancing contrast by adjusting the emission time of pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the power supply unit increases output to handle high luminance pixels, then power consumption capacity is improved, but power consumption increases
Solution Approach 1:
The luminance controller calculates the sum of input data for all pixels before the display frame is rendered and determines the appropriate emission control signal in advance. This preliminary calculation allows the system to pre-determine the current limit based on the actual luminance requirements, avoiding both over-provisioning (wasting power) and under-provisioning (causing display issues).
Solution Approach 2:
The system dynamically adjusts the emission control signal parameters (number of pulses and pulse width) based on the calculated sum of input data. This dynamic adjustment allows the power supply output to match the actual demand in real-time, improving power supply efficiency while maintaining adequate capacity for high luminance scenarios when needed.
2Use of energy by moving object
If the difference of electric current amounts between gradations is reduced to lower power consumption, then power consumption is improved, but luminance contrast deteriorates
Solution Approach 1:
The system changes the parameters of the emission control signal (number of pulses and pulse width) based on the sum of input data. By adjusting these parameters dynamically, the system can maintain adequate luminance contrast while optimizing power consumption - using more pulses or wider pulses when high luminance is needed, and fewer/narrower pulses when low luminance suffices.
3Illumination intensity
If more pixels display high luminance images, then image brightness is improved, but power consumption increases
Solution Approach 1:
The luminance controller receives feedback from the input data of all pixels, calculates the sum, and uses this information to adjust the emission control signal. This feedback mechanism ensures that the power consumption is directly correlated with the actual display requirements - if more pixels require high luminance, the system responds by allocating appropriate power through adjusted emission signals.
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 system effectively reduces power consumption and improves image contrast by limiting luminance range, preventing dazzling and flicker, while maintaining high image quality.
Implementation Method 1
The organic emission layer is disposed between the anode electrode and the cathode electrode, and emits light a combination of electrons and holes.
Data Source
AI summary
In an organic light emitting display and its driving method, a pixel portion includes a plurality of pixels which express images corresponding to a scan signal, an emission control signal, and a data signal. A scan driver transfers the scan signal and the emission control signal to the pixel portion. A data driver generates and transfers a plurality of data signals to the pixel portion using video data. A frame memory stores and transfers the video data in frame periods to the data driver. A luminance controller determines a pulse of the emission control signal using frame data, which is a sum of video data stored in the frame memory. A power supply unit supplies voltages of first and second power sources to the pixel portion. The luminance controller determines the number and widths of pulses in the emission control signal corresponding to a sum of the video data.