Display Panel Emission Timing and On-Pixel Ratio for Lower Power
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Solution Overview
Problem
Existing display apparatuses face inefficiencies in emission efficiency and high power consumption due to varying driving currents and pixel luminance settings.
Innovation Solution
The display apparatus adjusts emission periods and on-pixel ratios based on luminance settings, maintaining consistent driving currents while reducing power consumption by altering the duty ratios and on-pixel ratios in different luminance modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the emission period length is increased to improve emission efficiency, then the power consumption increases
Solution Approach 1:
The emission period length is dynamically adjusted based on the luminance setting. In low luminance mode, the emission period is extended to improve emission efficiency, while in high luminance mode, the emission period is reduced to lower power consumption. This dynamic adjustment allows the system to optimize emission efficiency when needed while minimizing power consumption when high luminance is not required.
Solution Approach 2:
The patent changes the emission period parameter according to different luminance settings. By adjusting this temporal parameter, the system achieves better emission efficiency in low luminance modes without incurring high power consumption penalties, as the extended emission period only occurs when the display is not at maximum brightness.
2Illumination intensity
If the driving current is increased to maintain luminance, then the power consumption increases
Solution Approach 1:
Instead of maintaining a high driving current continuously, the patent uses periodic emission periods. The light-emitting elements are driven at high current only during specific emission periods, while remaining off or in low-power states during non-emission periods. This periodic operation maintains the required luminance during display periods while significantly reducing average power consumption.
Solution Approach 2:
The driving current is dynamically controlled based on the luminance setting and emission timing. The system applies high driving current only when and where needed to maintain luminance, rather than continuously applying high current across all pixels and time periods, thus reducing overall power consumption while maintaining display quality.
3Area of stationary object
If the on-pixel ratio is increased to improve display coverage, then the power consumption increases
Solution Approach 1:
The patent implements periodic emission periods during which only a subset of pixels (a portion of the on-pixel ratio) are activated at any given time. By staggering the activation of different pixel groups across multiple emission periods, the system achieves full display coverage over time while reducing the instantaneous power consumption associated with having all pixels active simultaneously.
Data Source
AI summary
A display apparatus includes a display panel including a plurality of pixels, a gate driver configured to output a gate signal to the display panel, an emission driver configured to output an emission signal to the display panel, a data driver configured to apply a data voltage to the display panel and a driving controller configured to control the gate driver, the emission driver and the data driver. In a state in which a setting luminance of the display panel has a second setting luminance lower than a first setting luminance, an emission period in which the pixels emit has a second emission period length longer than a first emission period length. An on-pixel ratio of the pixels is changed based on the setting luminance.