Reflective Display Illumination Control via Ambient Light
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Solution Overview
Problem
Display devices with reflective image display units face challenges in maintaining desirable image luminance while minimizing power consumption, as existing illumination units either waste power under high ambient illuminance or cause viewer fatigue under low ambient illuminance.
Innovation Solution
A display device with a reflective image display unit and an illumination unit, where a light control unit adjusts the intensity of illumination based on ambient illuminance, increasing light intensity up to a first reference value, decreasing it beyond that, and turning off illumination above a second reference value, using a photosensor and circuit to calculate and control the illuminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the illumination unit shines strong light under low ambient illuminance conditions, then image luminance is increased and visibility is improved, but viewer fatigue is created and power consumption increases
Solution Approach 1:
The illumination intensity is dynamically adjusted based on ambient illuminance conditions. The light control unit changes the illumination parameter from high intensity in low ambient light to low or zero intensity in high ambient light, optimizing the balance between visibility and viewer comfort while reducing power consumption.
Solution Approach 2:
A photosensor detects ambient illuminance and provides feedback to the light control unit, which adjusts the illumination unit's output accordingly. This closed-loop control ensures that the illumination intensity is automatically optimized based on real-time environmental conditions, preventing viewer fatigue and excessive power consumption.
2Productivity
If the illumination unit shines light under high ambient illuminance conditions, then power is wasted, but image visibility is not greatly improved
Solution Approach 1:
The illumination unit's intensity parameter is reduced to zero or minimal levels when ambient illuminance exceeds a threshold. This parameter change eliminates unnecessary power consumption while maintaining adequate image visibility through ambient light alone.
Solution Approach 2:
The display device utilizes ambient light for image display when available, eliminating the need for active illumination. The system automatically transitions from using the illumination unit to relying on ambient light when conditions permit, optimizing power efficiency without sacrificing visibility.
3Use of energy by stationary object
If the illumination unit is turned off under high ambient illuminance, then power consumption is reduced, but image luminance may be insufficient in low ambient light conditions
Solution Approach 1:
The illumination unit's operational state is dynamically changed based on ambient conditions. The system transitions between ON and OFF states (or different intensity levels) according to ambient illuminance, ensuring adequate image luminance when needed while minimizing power consumption when ambient light is sufficient.
Solution Approach 2:
The photosensor continuously monitors ambient illuminance and provides feedback to control the illumination unit's state. This feedback mechanism ensures that the illumination is activated only when necessary to maintain adequate image luminance, preventing power waste while ensuring visibility in low ambient light conditions.
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
The solution allows for optimal image luminance according to ambient conditions while reducing power consumption, preventing excessive luminance and fatigue, and ensuring efficient power usage.
Implementation Method 1
using a photosensor and circuit to calculate and control the illuminance
Implementation Method 2
an illumination unit that illuminates the display region of the image display unit
Implementation Method 3
The reflective liquid crystal display panel includes a reflecting film that reflects external light, and displays an image by controlling the reflectance of external light
Data Source
AI summary
A display device includes: a reflective image display unit having a display region provided with an array of pixels; an illumination unit that illuminates the display region of the image display unit; and a light control unit that controls the intensity of the illumination light from the illumination unit according to ambient illuminance.