OLED Gamma Power Adjusting Circuit for Luminance Control
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Solution Overview
Problem
Existing organic light emitting diode (OLED) displays face limitations in reducing circuit logic size and accurately reflecting image luminance, particularly for complex images, due to reliance on average gray level values for brightness determination, which leads to increased power consumption and suboptimal picture quality.
Innovation Solution
The implementation of a gamma power adjusting circuit that extracts the number of white pixels from input digital video data to adjust the output level of gamma power, allowing for peak or average luminance adjustments without requiring division operations, thereby simplifying circuit logic and enhancing luminance adjustment accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If average gray level value is used to determine image brightness, then circuit logic can be implemented, but circuit logic size increases due to required division operations
Solution Approach 1:
The patent extracts only the maximum gray level value from the input image data, discarding other pixel values. This eliminates the need for division operations while still providing sufficient information for brightness determination and luminance adjustment, thereby reducing circuit logic size.
Solution Approach 2:
The patent changes the parameter used for brightness determination from average gray level value to maximum gray level value. This parameter change eliminates the computational complexity of division operations while maintaining the ability to accurately control display luminance according to image brightness.
2Ease of operation
If average gray level value is used for luminance adjustment, then brightness can be controlled, but picture quality deteriorates for complex images
Solution Approach 1:
The patent extracts only the maximum gray level value from the image, which is sufficient for luminance control. This simplification maintains effective brightness control while improving picture quality by focusing on the most relevant parameter for perceived brightness.
Solution Approach 2:
The patent changes the control parameter from average gray level to maximum gray level. This parameter change improves picture quality for complex images by better reflecting the actual brightness perception while maintaining straightforward luminance control capability.
3Manufacturing precision
If peak luminance is used for partly bright images, then picture quality improves, but power consumption increases
Solution Approach 1:
The patent dynamically adjusts display luminance based on the maximum gray level value of the input image. The luminance is set to peak level when the maximum gray level indicates a partly bright image, and reduced to average level when the image is entirely bright, thereby optimizing picture quality while managing power consumption.
Solution Approach 2:
The patent changes the luminance parameter dynamically based on the maximum gray level value. By using the maximum gray level as the control parameter, the system can selectively apply peak luminance only when necessary for picture quality, avoiding unnecessary power consumption for already bright images.
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 simplifies circuit logic, reduces power consumption, and improves picture quality by accurately reflecting the input image's luminance in the OLED display, enabling clearer and more efficient image rendering.
Implementation Method 1
When a driving voltage is applied to the anode electrode and the cathode electrode, holes passing through the hole transport layer HTL and electrons passing through the electron transport layer ETL move to the emission layer EML to form excitons. As a result, the emission layer EML generates visible light.
Data Source
AI summary
An organic light emitting diode display including a display panel having a plurality of data lines, a plurality of gate lines, and a plurality of pixels, a data drive circuit that converts input digital video data into data voltage with reference to gamma reference voltages and supplies the data voltage to the data lines, a gamma reference voltage generation circuit that generates the gamma reference voltages by dividing a high potential gamma power; and a gamma power adjusting circuit that adjusts display luminance by extracting a number of white pixels from the input digital video data and adjusting the output level of the high potential gamma power depending on the number of white pixels.