Projector Illuminance Feedback for Glare Prevention and Image Contrast
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Solution Overview
Problem
Existing projectors struggle with glare issues due to the degradation of contrast ratio when adjusting brightness based on content brightness information alone.
Innovation Solution
An electronic apparatus with a projecting part, illuminance sensor, lighting part, and processor that controls illuminance based on information from external lighting, projected image illuminance, and user location to adjust light source brightness and image projection to prevent glare.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If brightness information of contents is used to lower signal gain to prevent glare, then user glare is reduced, but contrast ratio of projected image is degraded
Solution Approach 1:
The system dynamically adjusts the light source brightness based on real-time illuminance sensor data rather than statically lowering signal gain. The processor continuously monitors ambient illuminance and projected image illuminance, then adaptively controls the light source intensity to maintain optimal contrast ratio while preventing glare under varying environmental conditions
Solution Approach 2:
An illuminance sensor is introduced as an intermediary component to measure both ambient illuminance and projected image illuminance. This sensor provides objective feedback to the processor, enabling precise control of the light source intensity to balance glare prevention with contrast ratio maintenance, avoiding the need to simply lower signal gain
2Illumination intensity
If light source brightness is increased to improve projected image visibility, then image quality is enhanced, but user glare increases
Solution Approach 1:
The system implements a feedback control mechanism where the illuminance sensor continuously monitors the brightness of the projected image and ambient lighting conditions. The processor uses this feedback to dynamically adjust the light source intensity, increasing brightness when ambient light is low and decreasing it when ambient light is high, thereby enhancing image visibility while preventing user glare
Solution Approach 2:
The system changes the operating parameters of the light source based on environmental conditions. By adjusting the light source intensity parameter in response to illuminance sensor readings, the system optimizes the balance between projected image brightness and glare prevention, rather than maintaining a fixed brightness level
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
Prevents user glare without degrading the quality of the projected image by dynamically adjusting illuminance and brightness based on environmental and user-specific conditions.
Implementation Method 1
an illuminance sensor to obtain information on first illuminance corresponding to an external lighting device
Implementation Method 2
a lighting part comprising a light source
Data Source
AI summary
An electronic apparatus comprises a projecting part to project an image, an illuminance sensor, a lighting part comprising a light source, a memory to store at least one instruction; and a processor configured to control the electronic apparatus by executing the at least one instruction stored in the memory. The processor is configured to control the illuminance sensor to obtain information on first illuminance corresponding to an external lighting device, control the illuminance sensor to obtain information on second illuminance corresponding to the image projected by the projecting part, and control the light source of the lighting part based on the information on the first illuminance and the information on the second illuminance.