Dual-Driver Light Source Apparatus for Low-Luminance Power Reduction
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Solution Overview
Problem
Current light source driving units for LCD devices consume excessive power in low-luminance modes, particularly in mobile devices, where they consume more than twice the energy compared to the light-emitting diodes they drive, leading to reduced battery life.
Innovation Solution
A light source driving apparatus comprising a controller, a first driver, and a second driver, which outputs specific control signals to manage voltage levels for normal and low-luminance modes, reducing power consumption by deactivating the first driver in low-luminance mode and utilizing a dimming voltage and ground voltage to minimize energy usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single driver is used to drive the light source in both normal and low-luminance modes, then the device complexity is reduced, but the power consumption in low-luminance mode increases excessively
Solution Approach 1:
The patent divides the driver into two separate drivers: a first driver for normal luminance mode and a second driver for low luminance mode. This segmentation allows each driver to be optimized for its specific operating condition, with the second driver consuming significantly less power in low-luminance mode while the first driver handles normal operation.
2Illumination intensity
If voltage is reduced to achieve low-luminance mode, then the illumination intensity is reduced, but the power consumption remains excessively high
Solution Approach 1:
The patent changes the operating parameters by using different drivers with different voltage characteristics for normal and low-luminance modes. The second driver is specifically designed to operate at lower voltages and currents, achieving both the desired reduction in illumination intensity and the critical reduction in power consumption for battery-powered devices.
3Illumination intensity
If the first driver is activated in low-luminance mode, then the normal luminance output is maintained, but unnecessary power consumption occurs
Solution Approach 1:
The patent implements a dynamic switching mechanism where the controller selectively activates either the first driver or the second driver based on the required luminance level. This dynamic operation ensures that the appropriate driver is used for each mode, preventing energy waste by avoiding activation of the high-power first driver when low luminance is sufficient.
Data Source
AI summary
A light source driving apparatus according to the present invention includes a controller, a first driver and a second driver. The controller outputs a first control signal to drive the light source in a normal-luminance mode and outputs a second control signal to drive the light source in a low-luminance mode. The first driver drives the light source, based on a first voltage in response to the first control signal in the low-luminance mode. The second driver drives the light source, based on a second voltage in response to the second control signal in the normal luminance mode. Therefore, the light source driving apparatus driving the light source decreases current-consumption and prevents unnecessary power consumption from increasing in a low-luminance driving mode.