Display Device Dynamic Brightness Control External Light
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Solution Overview
Problem
Existing display devices struggle to adjust brightness effectively based on external light intensity, often resulting in overly bright outputs when external light is low, and require constant dedicated light source output, leading to inefficient power usage.
Innovation Solution
A reflective display device with a display unit, illumination unit, measuring unit, and control unit that measures external light intensity and adjusts the intensity of multiple light sources and sub-pixel gradation values to achieve desired luminance, using expressions to calculate necessary output gradation values based on external light intensity and input signal gradation values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the dedicated light source output is kept constant to ensure adequate brightness, then the display luminance is maintained, but the power consumption increases
Solution Approach 1:
The patent implements dynamic control of the dedicated light source output based on real-time measurement of external light intensity. The control unit adjusts the light source intensity dynamically to match ambient conditions, replacing constant output with adaptive variable output that maintains display luminance while reducing power consumption during low external light periods
Solution Approach 2:
The patent employs a measuring unit that continuously monitors external light intensity and feeds this information back to the control unit. This feedback mechanism enables the system to automatically adjust the dedicated light source output according to actual ambient conditions, ensuring optimal display brightness while minimizing unnecessary power consumption
2Illumination intensity
If the dedicated light source is used to improve display visibility, then the brightness is adequate, but the power consumption increases
Solution Approach 1:
The system uses the measured external light information to automatically regulate its own light source output without requiring manual intervention. The control unit determines the appropriate light source intensity based on the measured external light intensity, enabling the display device to self-adjust and serve its own lighting needs efficiently
Solution Approach 2:
The patent changes the operating parameters of the dedicated light source based on external light conditions. By varying the light source intensity parameter according to measured external light intensity, the system maintains adequate display brightness while optimizing power consumption across different ambient lighting scenarios
3Use of energy by moving object
If the light source output is adjusted according to external light intensity, then the power consumption is reduced, but the display brightness may become insufficient
Solution Approach 1:
The measuring unit continuously monitors external light intensity and provides real-time feedback to the control unit, which adjusts the dedicated light source output accordingly. This feedback loop ensures that the light source intensity is optimized to maintain adequate display brightness while minimizing power consumption, preventing both over-brightness and under-brightness conditions
4Use of energy by moving object
If the display device uses only external light, then the power consumption is reduced, but the display output becomes extremely bright when external light intensity is high
Solution Approach 1:
The measuring unit monitors external light intensity and feeds this information to the control unit, which regulates the dedicated light source output to compensate for excessive external light. This feedback mechanism prevents the display from becoming overly bright by activating the dedicated light source when external light intensity exceeds optimal levels, while keeping it off or minimal when external light is already sufficient
Solution Approach 2:
The system dynamically changes the dedicated light source output parameter based on measured external light intensity. When external light is high, the light source parameter is reduced or turned off; when external light is low or absent, the light source parameter is increased to maintain optimal display brightness, thereby preventing extreme brightness variations
Data Source
AI summary
According to an aspect, a display device includes: a display unit a plurality of pixels performing that perform color reproduction by combining outputs of sub-pixels; an illumination unit including a first light source, a second light source, and a third light source; a measuring unit that measures intensity of light included in external light other than the light from the illumination unit; and a control unit that controls the intensity of the light to be emitted from each of the first light source, the second light source, and the third light source and controls gradation values of the respective sub-pixels based on the intensity of the external light measured by the measuring unit.