Image Projection Apparatus Peripheral Pixel Control
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Solution Overview
Problem
Reflection type light modulation elements in projectors cause degradation of projected images due to illumination light being reflected from ineffective areas outside the effective pixel area, and existing solutions like light shield plates can thermally deform and complicate the structure.
Innovation Solution
The use of a first and second light modulation element with a controller to control peripheral pixels, ensuring that light from these areas does not reach the second light modulation element, thereby preventing unnecessary light from being projected, and a two-stage luminance control system to maintain high contrast and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light shield plate with an opening is used to block illumination light from reaching ineffective areas, then light projection from outside the effective pixel area is reduced, but the structure becomes more complex and the light shield plate may thermally deform
Solution Approach 1:
The patent extracts and removes the light shield plate and its positioning mechanism from the optical system. Instead of using a physical shield, the invention controls the light modulation elements themselves to prevent light from ineffective areas from reaching the second light modulation element, thereby simplifying the structure while achieving the same light blocking function.
Solution Approach 2:
The patent replaces the mechanical light shield plate system with an electronic control system. The controller electronically controls the light modulation elements to block light from ineffective areas, substituting a mechanical structure with an electronic control approach that eliminates thermal deformation issues and structural complexity.
2Object-affected harmful factors
If a light shield plate is used to block light from ineffective areas, then image quality is improved, but thermal deformation occurs causing the shield plate to shift position
Solution Approach 1:
The patent removes the light shield plate from the system entirely, eliminating the source of thermal deformation and position instability. The function of blocking light from ineffective areas is achieved through electronic control of light modulation elements, which do not suffer from thermal deformation.
Solution Approach 2:
The patent replaces the mechanical light shield plate with an electronic control system that uses light modulation elements to block light. This substitution eliminates thermal deformation issues because the electronic control system does not involve mechanical components exposed to high temperatures.
3Manufacturing precision
If a mechanism for adjusting the position of the light shield plate is added, then light blocking precision is improved, but the structure becomes more complex
Solution Approach 1:
The patent extracts and removes the position adjustment mechanism from the system. Instead of mechanically adjusting the light shield plate position, the invention uses electronic control of light modulation elements to achieve precise light blocking without any mechanical adjustment components.
Solution Approach 2:
The patent replaces the mechanical position adjustment mechanism with an electronic control system. The controller electronically adjusts the light modulation elements to achieve precise light blocking, substituting mechanical adjustment with electronic control that eliminates complex mechanical structures.
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 configuration reduces light projection from outside the effective pixel area, improves image quality, and simplifies the projector structure by preventing thermal deformation and complex positioning mechanisms, while maintaining high contrast and multiple gradations.
Implementation Method 1
a first light modulation element configured to modulate a first light emitted from a light source and to generate a second light
Implementation Method 2
a second light modulation element configured to modulate the second light
Implementation Method 3
a controller configured to control pixels of the peripheral pixel area such that light from the peripheral pixel area does not reach the second light modulation element
Data Source
AI summary
An image projection apparatus includes a first light modulation element configured to modulate a first light emitted from a light source and to generate a second light, and a second light modulation element configured to modulate the second light. The first light modulation element is configured to receive the first light onto a modulable pixel area that can modulate the first light, the modulable pixel area including an effective pixel area that can modulate the first light and a peripheral pixel area arranged at the periphery of the effective pixel area. The image projection apparatus further comprises a controller configured to control pixels of the peripheral pixel area such that light from the peripheral pixel area does not reach the second light modulation element.