Image Display Luminance Control via Ambient Illuminance Detection
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Solution Overview
Problem
Conventional liquid-crystal display devices fail to adjust image quality effectively in varying ambient illuminance and do not consider the attributes of input image signals, leading to inappropriate brightness and contrast in different lighting conditions and when displaying film images.
Innovation Solution
An image display apparatus with an illuminance detector, luminance calculator, and image signal correction module that adjusts the luminance of light sources based on ambient illuminance and the nature of the input image signal, ensuring optimal brightness and contrast by setting upper and lower limits for light source luminance and modifying the image signal accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the luminance of each illumination region is controlled based on input image signal, then image quality is improved, but the displayed image becomes too bright or has too high contrast in dark surroundings
Solution Approach 1:
The patent changes the control parameter from fixed image signal values to dynamic ranges adjusted by ambient illuminance. The luminance controller adjusts the range of luminance values for illumination regions based on detected ambient light levels, preventing the display from appearing too bright in dark environments while maintaining image quality.
Solution Approach 2:
The patent introduces feedback through ambient illuminance detection. The illuminance detector monitors environmental lighting conditions and feeds this information back to the luminance controller, which then adjusts the luminance range dynamically to match surrounding lighting conditions and avoid excessive brightness.
2Manufacturing precision
If the luminance of each illumination region is controlled based on input image signal, then image quality is improved, but the displayed image becomes too dark or has too low contrast in bright surroundings
Solution Approach 1:
The patent dynamically adjusts the luminance control parameters based on ambient illuminance levels. In bright surroundings, the controller expands the luminance range to maintain adequate brightness and contrast, preventing the display from appearing too dark while preserving image quality.
Solution Approach 2:
The ambient illuminance detection provides feedback that triggers the luminance controller to adjust illumination levels. When ambient light is detected as high, the system increases the luminance range to maintain visibility and contrast, preventing the display from appearing too dark.
3Device complexity
If the display apparatus controls luminance without taking ambient illuminance into account, then the control system is simple, but the displayed image has inappropriate brightness and contrast in varying lighting conditions
Solution Approach 1:
The patent introduces dynamic parameter adjustment based on ambient illuminance detection. The luminance controller modifies the range of illumination values according to detected environmental light levels, enabling appropriate brightness and contrast adaptation without requiring complex manual intervention.
Solution Approach 2:
The system performs self-adjustment by automatically detecting ambient illuminance and independently modifying its own luminance output. This self-service capability allows the display to adapt to lighting conditions without external control, balancing simplicity with environmental responsiveness.
4Device complexity
If the display apparatus controls luminance without taking film image attributes into account, then the control system is simple, but film images are displayed with excessive brightness and high contrast
Solution Approach 1:
The patent introduces attribute-based parameter adjustment where the luminance controller modifies illumination ranges according to the detected characteristics of the input image signal. When film images are detected, the controller applies specific luminance ranges that prevent excessive brightness and high contrast, maintaining authentic film appearance.
Solution Approach 2:
The system uses feedback from image attribute detection to adjust luminance control parameters. By monitoring the characteristics of the input signal (such as film image attributes), the controller receives feedback that triggers appropriate luminance adjustment, preventing distortion of film image qualities.
Data Source
AI summary
According to one embodiment, an image display apparatus comprises a detector configured to detect an illuminance of surroundings, an upper and lower limit calculator configured to calculate an upper limit and a lower limit of luminance based on the detection result of the illuminance, a luminance calculator configured to calculate the luminance of each of light sources to display an image based on an input image signal in the range of the upper limit to the lower limit, a correction module configured to correct the input image signal based on the calculated luminance, a light emitter configured to emit light based on the calculated luminance, the light emitter includes the light sources, and a light modulator configured to display an image by modulating light from each of the light sources based on the corrected input image signal.