Mobile Display Driving Apparatus Power Saving Mode
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Solution Overview
Problem
Mobile display devices, such as smartphones and notebooks, consume excessive power due to their ability to display color images, leading to rapid battery depletion.
Innovation Solution
A mobile display device driving apparatus and method that includes a liquid crystal panel with sub-pixel areas of four colors, a power saving mode signal generator, a controller, and a backlight unit, which adjusts the gain value and dimming signal based on remaining battery power or ambient light to convert three-color input data into four-color data, reducing power consumption by adjusting the backlight's light transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If color image display is enabled, then display quality is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic switching between color and black-and-white display modes based on battery power levels. The controller monitors remaining power and automatically adjusts display mode: when power is sufficient, color display is enabled for high quality; when power is low, black-and-white mode is activated to reduce power consumption. This dynamic adaptation resolves the contradiction by allowing the system to optimize between display quality and power consumption based on real-time conditions.
Solution Approach 2:
The patent changes the display parameter (color vs. black-and-white) based on power availability. By modifying the display mode parameter according to battery power levels, the system can maintain high display quality when power is available and switch to low-power mode when necessary, thus resolving the contradiction between display quality and power consumption.
2Illumination intensity
If backlight brightness is increased, then image visibility is improved, but power consumption increases
Solution Approach 1:
The patent dynamically adjusts backlight brightness based on display mode and power levels. In color display mode, the backlight operates at normal brightness for optimal visibility. When switching to black-and-white mode to conserve power, the backlight brightness is reduced. This dynamic adjustment allows the system to maintain image visibility when needed while significantly reducing power consumption during low-power modes.
Solution Approach 2:
The patent applies partial action by providing sufficient backlight brightness for color display when power is available, but reducing brightness when power is constrained. This partial reduction in backlight intensity during low-power modes enables the system to maintain acceptable visibility while substantially reducing energy consumption.
3Illumination intensity
If four-color sub-pixels are used, then display quality is improved, but manufacturing complexity increases
Solution Approach 1:
The patent segments the display into different functional modes (color display mode and black-and-white display mode) based on sub-pixel usage. In color mode, all four-color sub-pixels are activated for high quality display. In black-and-white mode, only specific sub-pixels are used, simplifying the effective manufacturing requirements for low-power operation. This segmentation allows the system to leverage the full capability of the display hardware when needed while simplifying operation under power constraints.
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 solution extends battery life by optimizing power usage, allowing mobile devices to maintain color image display while reducing power consumption, and further conserves energy by switching to black and white mode when necessary, thereby increasing the device's usable time.
Implementation Method 1
an LCD device is adapted to display an image by adjusting transmittance of light irradiated from a backlight unit
Implementation Method 2
an optical sensor that detects the amount of ambient light
Data Source
AI summary
A mobile display device driving apparatus and method which can reduce power consumption are disclosed. The driving apparatus includes a liquid crystal panel having a plurality of liquid crystal cells each formed in sub-pixel areas of four colors, a battery charged with a voltage, a power saving mode signal generator that detects the remaining power of the battery and generates a power saving mode signal based on the detected power to set a power saving mode of the liquid crystal panel. A controller sets a gain value in response to the power saving mode signal, converts external three-color input data into four-color data based on the set gain value and generates a dimming signal in response to the power saving mode signal. A panel driver displays an image based on the four-color data on the liquid crystal panel. An inverter generates a lamp drive voltage based on the dimming signal, and a backlight unit generates light in response to the lamp drive voltage and irradiates the generated light to the liquid crystal panel.