Display Apparatus with Segmented Pixel Drive Frequencies
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Solution Overview
Problem
Display apparatuses face a challenge in increasing refresh rate while minimizing the associated increase in power consumption, especially when using multiple sub-pixels per pixel, as higher refresh rates lead to higher power consumption in the drive system.
Innovation Solution
A display apparatus with first and second pixels, where the first pixels are driven at a first drive frequency and the second pixel, with higher luminance, is driven at a second drive frequency higher than the first, utilizing a switching circuit to manage the drive signals and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the refresh rate is increased to improve motion recognition, then the smoothness of displayed motion is improved, but the power consumption in the drive system increases significantly
Solution Approach 1:
The pixel array is segmented into two groups: first pixels (color pixels: red, green, blue) and second pixels (high luminance pixels: white). Each group is driven at different frequencies through separate scanning lines, allowing the high luminance pixels to be updated at a higher rate than color pixels, thereby improving motion recognition while limiting overall power consumption increases.
Solution Approach 2:
Different drive frequencies are applied to different pixel types based on their specific requirements. The second pixels (white) that require higher refresh rates for motion recognition are driven at a second drive frequency higher than the first drive frequency of color pixels, optimizing performance locally where needed rather than uniformly across all pixels.
2Illumination intensity
If multiple sub-pixels per pixel are used to improve display quality, then the color reproduction is improved, but the power consumption in the drive system increases
Solution Approach 1:
Each pixel is segmented into multiple sub-pixels (red, green, blue, white) with different functions. The white sub-pixel serves primarily for luminance and motion recognition, while color sub-pixels handle color reproduction. This segmentation allows selective driving strategies where white sub-pixels can be refreshed more frequently without proportionally increasing power consumption for all sub-pixels.
Solution Approach 2:
The white sub-pixel serves multiple functions: it provides high luminance for brightness requirements and acts as a reference for motion recognition. This multi-functionality reduces the need for frequent updates of all color sub-pixels, thereby reducing overall power consumption while maintaining display quality.
3Speed
If all pixels are driven at the same high frequency to improve motion recognition, then the smoothness of motion is improved, but the power consumption increases significantly
Solution Approach 1:
The drive system dynamically adjusts the refresh rate for different pixel types based on their specific requirements. Second pixels (white) are driven at a higher frequency for motion recognition, while first pixels (color) are driven at a lower frequency, creating a dynamic, adaptive refresh strategy rather than a static uniform approach.
Solution Approach 2:
The scanning circuit implements periodic scanning with different periods for different pixel groups. The first scanning line scans first pixels at a first drive frequency, while the second scanning line scans second pixels at a second drive frequency, creating a multi-periodic scanning pattern that optimizes motion recognition while managing power consumption.
Data Source
AI summary
According to an aspect, a display apparatus includes: a plurality of first pixels to which at least one color is allocated; and a second pixel to which a high luminance color having higher luminance than luminance of the color of the first pixels is allocated. The first pixels are driven at a first drive frequency. The second pixel is driven at a second drive frequency higher than the first drive frequency.