OLED Display Pixel-On-Ratio Control for Power Reduction
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Solution Overview
Problem
Current automatic current limiting (ACL) methods for OLED displays struggle to integrate with data rendering technologies, leading to inconsistencies in image quality and power consumption, as they are difficult to apply due to differences in data formats and optical characteristics.
Innovation Solution
A display device and driving method that include a controller to convert video signals into image data signals, calculate the pixel-on-ratio for each subpixel, and adjust the light emission duty ratio to reduce driving current, using a data converter and automatic current limiter to optimize power consumption based on the PenTile structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If automatic current limiting (ACL) method is applied to reduce power consumption, then power consumption is reduced, but it is difficult to apply due to data format differences and optical characteristic inconsistencies
Solution Approach 1:
The patent changes the data parameter by converting video signals to image data signals with adjusted luminance values. The ACL method processes this converted image data to calculate average luminance and determine light emission periods, thereby adapting the ACL method to work with the specific data format and optical characteristics of the display device.
Solution Approach 2:
The patent introduces an intermediary processing stage between the video signal input and the ACL method application. The controller converts video signals to image data signals, acts as a mediator that prepares the data in a format compatible with the ACL method, and then applies ACL to the processed image data to achieve power consumption reduction.
2Manufacturing precision
If data rendering technology is used to improve image quality, then image quality is enhanced, but optical characteristics after data rendering cannot be guaranteed for ACL application
Solution Approach 1:
The patent performs preliminary action by converting video signals to image data signals before applying the ACL method. This preliminary conversion ensures that the data is in the correct format and optical characteristics are properly adjusted, allowing the ACL method to reliably process the data and maintain both image quality and optical characteristic consistency.
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 solution effectively reduces power consumption by calculating the pixel-on-ratio for each subpixel and adjusting the light emission period, ensuring consistent image quality and improved luminance control, thereby enhancing the efficiency of OLED displays.
Implementation Method 1
each pixel is configured to emit light with a driving current corresponding to image data signals transmitted through the data lines during a light emission period
Data Source
AI summary
In one aspect, the display device includes a display unit including a plurality of pixels connected to scan lines, light emission control lines, and data lines, where each pixel is configured to emit light with a driving current corresponding to image data signals transmitted through the data lines based on light emission control signals transmitted through the light emission control lines. Each of the pixels includes subpixels, each configured to display one of a plurality of colors. The device also includes a controller configured to convert external video signals to image data signals, output the converted signals to a data driver, generate light emission driving control signals for controlling the light emission duty ratio of the light emission control signals, and calculate the pixel-on-ratio for each subpixel to reduce the driving current.