Light Source Unit for Projection Displays
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Solution Overview
Problem
Existing projection-type displays face challenges in maintaining precise white balance and dynamic range for light sources emitting different colors, leading to decreased resolution and potential flicker due to inadequate feedback control and uneven light source performance.
Innovation Solution
A light source unit and projection-type display that utilize a single light quantity detector to measure light quantities of multiple colors by controlling light emission timing and detector gain, allowing for precise measurement and feedback control through simultaneous emission of colors except during measurement periods, where individual light sources are extinguished to enable accurate sampling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If one light quantity detector is used to detect optical intensities for multiple optical device groups, then device complexity is reduced, but measurement precision deteriorates due to insufficient dynamic range for each color
Solution Approach 1:
The patent implements periodic action by causing optical device groups to emit light sequentially in time series, with each group emitting light at different time periods. The light quantity detector measures optical intensities at these different time periods, allowing a single detector to accurately measure multiple colors without dynamic range issues that would occur with simultaneous detection.
Solution Approach 2:
The patent applies dynamics by making the light emission timing adjustable and controllable. The controller regulates which optical device groups emit light at specific time periods, enabling flexible measurement arrangements that optimize the detector's dynamic range usage for each color measurement.
2Ease of operation
If collective sampling is performed for optical device groups of the same color, then measurement process is simplified, but measurement precision deteriorates due to uneven performance of individual semiconductor light-emission devices
Solution Approach 1:
The patent applies segmentation by dividing the measurement process into individual device-level measurements. Instead of collectively sampling optical device groups, the system measures each semiconductor light-emission device individually, allowing precise identification and control of each device's light quantity output despite variations in device performance.
Solution Approach 2:
The patent implements feedback control by using the measured light quantity values of individual semiconductor light-emission devices to regulate their driving currents. This closed-loop control ensures that each device operates at the desired light output level, compensating for manufacturing variations and maintaining consistent performance.
3Device complexity
If feedback control is not performed with sufficient dynamic range, then device complexity remains low, but reliability deteriorates due to flicker caused by periodic changes in light quantity contrast
Solution Approach 1:
The patent uses periodic action to have each optical device group emit light at specific time periods, allowing the detector to measure each color when it occupies a significant portion of the detector's dynamic range. This timing-based separation ensures accurate measurement of light quantity for feedback control, preventing flicker and maintaining stable output.
Solution Approach 2:
The patent replaces potential hardware complexity with a control-based solution. Instead of using multiple detectors or complex optical switching mechanisms, the system uses electronic control of light emission timing and detector gain to achieve precise measurement and stable operation.
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 allows for precise measurement and control of light quantities across multiple colors, enhancing resolution and preventing flicker, while accommodating variations in light source performance.
Implementation Method 1
a light quantity detector that receives the rays of colors emitted by the plurality of light source sections
Data Source
AI summary
A light source unit of the disclosure includes a plurality of light source sections, a light quantity detector, and a controller. The plurality of light source sections emit rays of colors different from each other. The light quantity detector receives a plurality of color rays emitted by the plurality of light source sections as spatially common light. The controller controls a light emission timing of each of the plurality of light source sections and a gain of the light quantity detector, and measures light quantities of the respective plurality of color rays at different timings and with different gains on a basis of a detection result of the light.