LED Light Source Apparatus Periodic Drive Mode Power Control
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Solution Overview
Problem
Conventional light source apparatuses, especially those using LEDs, face challenges in reducing power consumption without implementing local dimming control, which is not always desired or feasible.
Innovation Solution
A light source apparatus with a plurality of light-emitting diodes of different colors, featuring a setting unit to select between drive modes and a control unit that adjusts the drive current and lighting period to optimize power usage, allowing for reduced power consumption without local dimming control by using a second drive mode with lower drive current values and longer lighting periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If local dimming control is implemented to reduce power consumption, then power consumption decreases, but device complexity increases
Solution Approach 1:
The patent applies periodic action by switching LEDs between lighting and non-lighting periods in a cyclic manner. The control unit sets a lighting period ratio that determines the proportion of time LEDs remain illuminated within each cycle, enabling power consumption adjustment without complex spatial control systems. This temporal modulation achieves energy savings while maintaining uniform illumination perception.
Solution Approach 2:
The patent changes operational parameters by adjusting the lighting period ratio and drive current values according to different drive modes. The control unit modifies these parameters dynamically based on display content characteristics, transitioning between first drive mode (higher current, shorter lighting period) and second drive mode (lower current, longer lighting period) to optimize power consumption while maintaining image quality.
2Use of energy by moving object
If drive current is reduced to lower power consumption, then power consumption decreases, but light emission brightness decreases
Solution Approach 1:
The patent compensates for reduced light emission brightness caused by lower drive current by increasing the lighting period ratio. LEDs remain illuminated for a longer proportion of each cycle, maintaining average brightness perception while operating at lower current levels during the lighting period, thus reducing overall power consumption.
Solution Approach 2:
The patent dynamically adjusts the lighting period ratio in response to different drive modes and display conditions. The control unit modifies the temporal characteristics of LED operation adaptively, transitioning between different lighting period ratios to balance brightness requirements and power consumption goals under varying operational conditions.
3Illumination intensity
If lighting period is extended to maintain brightness, then light emission brightness is maintained, but power consumption increases
Solution Approach 1:
The patent changes the drive current value parameter to compensate for extended lighting periods. By operating at lower drive current values during the lighting period, the system reduces instantaneous power consumption while the extended lighting period maintains average brightness perception, achieving overall power savings.
Solution Approach 2:
The patent uses periodic switching with optimized lighting period ratios to manage the trade-off between brightness and power consumption. By carefully controlling the duty cycle and synchronizing with display refresh rates, the system maintains perceived brightness while minimizing actual energy consumption through strategic illumination timing.
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 approach effectively reduces power consumption of the light source apparatus without requiring local dimming control, improving power efficiency and maintaining desired light emission characteristics.
Implementation Method 1
a light-emitting unit having a plurality of light-emitting diodes
Data Source
AI summary
A light source apparatus includes: a light-emitting unit having a plurality of light-emitting diodes having mutually different light emission colors; a setting unit configured to set a drive mode; and a control unit configured to drive the light-emitting unit in such that each of the plurality of light-emitting diodes emits light periodically, by a drive method corresponding to the drive mode set by the setting unit, wherein in a case where the light-emitting unit is lit with a predetermined light emission brightness, in a light-emitting diode from among the plurality of light-emitting diodes, a drive current value during a lighting period is lower and a lighting period during one cycle is longer in a second drive mode than those in a first drive mode.