MEMS Display Subframe Correction for Gradation Noise
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Solution Overview
Problem
Conventional display apparatuses using binary MEMS mirrors struggle to improve image quality due to insufficient low gradation levels, leading to noise and blackening issues.
Innovation Solution
A display apparatus that detects the presence of an empty second subframe in input image data, generates correction image data, and controls the light source to display this data during the second subframe, effectively increasing gradation levels and fine-tuning gamma characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If binary MEMS mirrors are used for light modulation, then device complexity is reduced and manufacturing is simplified, but image quality deteriorates due to insufficient low gradation levels
Solution Approach 1:
The display frame is divided into multiple subframes, with the first subframe displaying the original image and the second subframe displaying correction image data. This segmentation allows independent optimization of different image portions to address gradation insufficiency while maintaining binary mirror simplicity.
Solution Approach 2:
Correction image data is generated in advance by detecting empty second subframes and preparing appropriate correction patterns. This preliminary action ensures that gradation enhancement is ready before display, preventing image quality deterioration without requiring complex real-time processing.
2Use of energy by moving object
If conventional subframe driving is used, then light source efficiency is improved, but image quality deteriorates due to noise and blackening at low gradation levels
Solution Approach 1:
Different subframes serve different purposes: the first subframe maintains efficient light source usage for overall image display, while the second subframe provides localized correction specifically for low gradation regions. This local quality differentiation resolves the contradiction between efficiency and image quality.
Solution Approach 2:
Correction image data acts as an intermediary between the binary display limitations and the desired continuous gradation quality. It mediates the transition by introducing intermediate gradation levels through the second subframe without disrupting the efficient subframe driving structure.
3Duration of action of stationary object
If maximum gradation values are replaced with white subframes, then light source life is prolonged, but image quality deteriorates with loss of color information
Solution Approach 1:
Instead of completely replacing maximum gradation values with white subframes, the invention applies partial correction only where needed in the second subframe. This excessive action in specific regions (low gradation areas) compensates for the information loss from white subframe replacement, maintaining color accuracy while extending light source life.
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
This approach enhances image quality by increasing gradation levels, reducing noise and blackening, and expanding the color gamut, resulting in smoother gradation and improved display performance.
Implementation Method 1
a display panel that includes a light modulation device provided for each pixel, and modulates irradiation light from a light source
Data Source
AI summary
A display apparatus of the present disclosure includes: an image detection unit that determines whether an empty second subframe is present in input image data, in addition to a first subframe that displays an image; a correction image generation unit that generates correction image data for correcting the input image data; a control unit that performs control to display the correction image data generated by the correction image generation unit during the period of the second subframe, when the image detection unit detects that the second subframe is present in the input image data; and a display panel that includes a light modulation device provided for each pixel, and modulates irradiation light from a light source, on the basis of input image data including the correction image data.