LCD Brightness Adjustment for Dark Region Recognition
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Solution Overview
Problem
Portable wireless terminals with small-sized LCDs face challenges in correctly recognizing dark regions of images due to limitations in expressing darkness and human visual adaptation, leading to poor recognition performance, especially when bright and dark regions coexist.
Innovation Solution
An image display device with a liquid crystal display (LCD) that analyzes human color recognition and response processes by converting original RGB format images to YUV format, using a mapping table to adjust brightness values and improve dark region recognition by comparing average brightness with a reference value, ensuring accurate display of dark regions without altering chrominance information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If LCD structure is used for display, then device portability and compactness are improved, but ability to express dark regions deteriorates
Solution Approach 1:
The patent applies parameter changes by adjusting the brightness values of pixels in the image data before display. Specifically, it modifies the luminance component (Y) of YUV format image data through brightness adjustment, enhancing dark regions while preserving the LCD's compact structure. This allows the small LCD display to compensate for its inherent difficulty in expressing darkness by preprocessing the image parameters.
2Ease of operation
If human visual adaptation to brightness is considered, then natural image perception is improved, but recognition of dark regions in small displays deteriorates
Solution Approach 1:
The patent applies local quality by selectively adjusting the brightness of different regions within the image. It calculates the average brightness of the entire image and uses this information to determine which regions need enhancement. By focusing brightness adjustment on dark regions while preserving bright regions, the system optimizes local image quality to compensate for the small display area, making dark regions more recognizable without affecting the overall natural perception.
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 enhances the recognition performance for dark regions in portable wireless terminals by adjusting brightness values at the pixel level, improving image clarity and user experience without degrading bright regions, thus overcoming the inherent limitations of LCDs in expressing darkness.
Implementation Method 1
When a voltage is applied to the LCD at room temperature, the liquid crystal changes from a disordered liquid state to a liquid-solid state
Implementation Method 2
When the voltage is applied, the liquid crystal molecules are rearranged vertically
Implementation Method 3
The polarizing filters are arranged along the perpendicular polarizing axes and the light twists 90 degrees as it passes through the liquid crystals
Data Source
AI summary
An apparatus and method are provided for displaying an image. A process of human color recognition and a process of human color response are analyzed to find a reference brightness value of an image such that a dark region of the image can be correctly detected. A brightness of the image is adjusted such that a specific region is not excessively bright or dark. Accordingly, a user can recognize the image. The apparatus and method can be applied to an image display device having a Liquid Crystal Display (LCD), such as a portable wireless terminal having a small-sized LCD.