Display Device Luminance Control via Partition Index Calculation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices with increasing resolution face a reduction in aperture ratio, leading to higher power consumption due to increased backlight luminance requirements, and existing solutions for enhancing luminance, such as adding a white pixel, can result in insufficient luminance for other pixels, affecting color display quality.
Innovation Solution
A display device with a matrix of pixels including a first, second, third, and fourth sub-pixel, where a signal processing unit calculates the necessary light quantity for each pixel and controls the surface light source based on a calculated index value that considers the cumulative frequency and position of partitions, allowing for dynamic adjustment of luminance to maintain color accuracy and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If resolution is increased, then display quality is improved, but aperture ratio is reduced leading to increased power consumption
Solution Approach 1:
The backlight luminance is dynamically adjusted based on the displayed image content. The signal processing unit analyzes the input image, determines appropriate luminance levels for different regions, and controls the backlight accordingly. This allows the system to maintain high resolution while reducing power consumption by not maintaining maximum luminance throughout, but rather adjusting it based on actual display requirements.
Solution Approach 2:
Different regions of the display are treated differently in terms of backlight luminance control. The system identifies regions with high luminance requirements (such as those containing white or light-colored pixels) and applies higher luminance only to those regions, while other regions can operate at lower luminance levels. This local differentiation maintains display quality where needed while reducing overall power consumption.
2Use of energy by moving object
If white pixel is added to enhance luminance, then backlight current is reduced, but luminance for other pixels becomes insufficient affecting color display quality
Solution Approach 1:
The system dynamically adjusts the white pixel output based on the input image content and the required luminance levels. Rather than operating at fixed maximum output, the white pixel's luminance is modulated according to the local requirements determined by the signal processing unit. This allows the white pixel to contribute to luminance enhancement while maintaining appropriate color saturation and display quality in other regions.
Solution Approach 2:
The output parameters of the white pixel are changed dynamically based on the displayed content. The signal processing unit calculates appropriate output values for the white pixel that balance luminance enhancement with color display requirements. By adjusting the white pixel's output parameter according to the specific display needs, the system avoids excessive luminance that would wash out colors while still benefiting from the luminance boost.
3Use of energy by moving object
If backlight luminance is reduced for power saving, then power consumption is decreased, but luminance for other pixels becomes insufficient
Solution Approach 1:
The backlight luminance is controlled locally rather than uniformly across the entire display. The signal processing unit identifies specific regions that require high luminance (such as regions displaying white or light colors) and applies higher luminance only to those regions. Other regions can operate at lower luminance levels, reducing overall power consumption while maintaining adequate luminance where it is most needed for display quality.
Solution Approach 2:
The backlight luminance is dynamically adjusted based on the displayed image content rather than maintaining a fixed level. The system analyzes the input image, determines the luminance requirements for different regions, and adjusts the backlight accordingly in real-time. This dynamic control allows the system to reduce power consumption by lowering luminance when the content does not require high luminance, while still providing adequate luminance when needed.
Data Source
AI summary
A display device includes a signal processing unit that receives input signals, and calculates output signals to a first sub-pixel, a second sub-pixel, a third sub-pixel, and a fourth sub-pixel. The signal processing unit calculates a frequency of pixels belonging to each of a plurality of partitions using a light quantity of a surface light source. The signal processing unit calculates an index value for each of the partitions by at least multiplying the cumulative frequency being obtained by sequentially adding the frequency of pixels from a partition having the maximum light quantity among the partitions, and the number of partitions representing a position of a partition to which the cumulative frequency belongs counted from the partition having the maximum light quantity. The signal processing unit controls luminance of the surface light source based on a partition in which the index value exceeds a threshold.