Display Device Bias Voltage Segmentation for Brightness Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing emissive display devices face challenges in maintaining high display quality, particularly in terms of brightness uniformity and color accuracy, due to variations in operating frequency and bias voltage management.
Innovation Solution
The display device incorporates a display panel with distinct regions, each connected to separate bias voltage lines with varying voltage levels and timing, allowing for independent control of bias voltages across different regions. This setup includes a voltage generator to manage the bias voltages and a pixel circuit with transistors and capacitors to control the light emission based on the bias signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single bias voltage line is used for the entire display panel, then the device complexity is reduced, but brightness uniformity and color accuracy deteriorate due to variations in operating frequency
Solution Approach 1:
The display panel is divided into multiple regions (first region and second region), each with its own bias voltage line (first bias voltage line and second bias voltage line). This segmentation allows independent bias voltage control for each region, enabling compensation for brightness and color variations caused by operating frequency changes, thereby improving brightness uniformity across the entire panel.
Solution Approach 2:
Different regions of the display panel are provided with different bias voltage levels (first bias voltage and second bias voltage) that are optimized for their specific locations and operating conditions. This local quality approach ensures that each region maintains optimal brightness and color accuracy despite variations in operating frequency, resolving the contradiction between simplified design and manufacturing precision.
2Ease of operation
If bias voltage levels are changed simultaneously across all regions, then the control timing is simplified, but display quality deteriorates due to inability to compensate for regional variations
Solution Approach 1:
The bias voltage levels for different regions are changed at different times (different time points) rather than simultaneously. This dynamic timing control allows each region to receive bias voltage adjustments optimized for its specific operating conditions, improving color accuracy while maintaining manageable control complexity through sequential rather than simultaneous updates.
3Adaptability or versatility
If the display panel operates at variable frame frequencies, then the adaptability is improved, but display quality deteriorates due to bias voltage variations
Solution Approach 1:
The bias voltage levels (first bias voltage and second bias voltage) are dynamically adjusted based on the operating frame frequency. When the frame frequency changes, the bias voltage parameters are modified to compensate for the resulting variations in pixel performance, thereby maintaining brightness uniformity across different operating conditions while preserving the adaptability to variable frame rates.
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 solution enhances display quality by minimizing brightness and color differences between regions, even when the display panel operates at variable frame frequencies, thereby reducing the occurrence of stains and improving overall image quality.
Implementation Method 1
An emissive display device among display devices displays an image by using a light emitting diode that generates a light through the recombination of electrons and holes
Data Source
AI summary
A display device includes: a display panel having a first region and a second region defined in the display panel, in which the second region is adjacent to the first region in a first direction. The display panel includes: a first pixel disposed in the first region, a second pixel disposed in the second region, a first bias voltage line electrically connected to the first pixel to transmit a first bias voltage, and a second bias voltage line electrically connected to the second pixel to transmit a second bias voltage. A time point, at which a level of the first bias voltage is changed, differs from a time point at which a level of the second bias voltage is changed, when the display panel operates at a first frame frequency.