Peak Luminance Adjustment for Power Stabilization in Self-Luminous Displays
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Solution Overview
Problem
Self-luminous display apparatuses, such as organic EL displays, experience variable power consumption due to changing video signal inputs, leading to unpredictable battery life in battery-driven devices, as existing techniques focus on improving picture quality rather than power consumption uniformity.
Innovation Solution
A self-luminous display apparatus with a mean gradation value calculation section, power consumption calculation section, and peak luminance adjustment section that adjusts peak luminance on a per-frame basis to ensure power consumption remains within a preset limit, using a lookup table to determine the necessary adjustments based on the calculated mean gradation value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If variable control of light emission time is used to improve picture quality, then response speed and contrast are improved, but power consumption varies dramatically
Solution Approach 1:
The patent applies dynamics by making the peak luminance adjustable and adaptable to different display conditions. The system dynamically adjusts the peak luminance based on the relationship between luminance and power consumption, allowing the display to optimize its performance characteristics in real-time rather than being fixed. This resolves the contradiction by enabling the system to adapt between speed/contrast performance and power consumption based on actual needs.
Solution Approach 2:
The patent changes the parameter of peak luminance to resolve the contradiction. By establishing an adjustable relationship between peak luminance and power consumption, the system can modify this parameter to achieve either improved response speed and contrast (higher peak luminance) or reduced power consumption (lower peak luminance), depending on the operational requirements.
2Illumination intensity
If peak luminance is increased to improve contrast performance, then contrast is improved, but power consumption increases
Solution Approach 1:
The system dynamically adjusts peak luminance based on the desired contrast performance and power consumption requirements. By making the peak luminance可调 (adjustable), the system can optimize the balance between achieving high contrast performance and maintaining acceptable power consumption levels, rather than being locked into a fixed relationship.
Solution Approach 2:
The patent directly addresses this contradiction by establishing an adjustable parameter relationship between peak luminance and power consumption. The controller can modify the peak luminance parameter to achieve the desired contrast performance while keeping power consumption within acceptable limits, or prioritize power savings when contrast requirements are lower.
3Reliability
If battery capacity is increased to support variable power consumption, then power consumption stability is improved, but device weight and size increase
Solution Approach 1:
The system performs preliminary calculation of the relationship between peak luminance and power consumption to determine appropriate peak luminance settings before actual display operation. By pre-calculating and storing this relationship data, the controller can make informed decisions about peak luminance adjustment without needing excessive battery capacity to handle unpredictable power consumption variations, thus avoiding increased battery weight.
Solution Approach 2:
The patent implements feedback by using the calculated relationship between peak luminance and power consumption to continuously adjust peak luminance settings. This feedback mechanism allows the system to maintain power consumption stability through active control rather than relying on oversized battery capacity, thereby avoiding increased device weight while ensuring reliable power management.
Data Source
AI summary
A self-luminous display apparatus, a peak luminance adjustment apparatus is disclosed wherein power to be consumed by a self-luminous display panel is compulsorily suppressed to a level within a prescribed range and consequently the life of a battery is maintained. A mean gradation value calculation section calculates a mean gradation value of a video signal inputted within a period of one frame. A power consumption calculation section determines a standard peak luminance corresponding to the calculated mean gradation value and calculates a power consumption amount to be consumed based on the standard peak luminance and the calculated mean gradation value. A peak luminance adjustment section adjusts the standard peak luminance so that a total value of the power consumption to be consumed within a fixed period of time may not exceed a preset power amount.