Field-Sequential Single LCD Projector With Half-Field Driving
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Solution Overview
Problem
The development of a pure field sequential single LCD projector has been hindered by high bandwidth requirements for driver ICs, slow response speeds of liquid crystals, and user dissatisfaction with smearing and cross-color issues, making it difficult to produce high-quality projectors with FHD resolution at affordable prices.
Innovation Solution
A new field sequential single LCD projector design comprising an LED light source, collecting and collimating devices, a light-combining and color-filtering device, focusing and homogenizing devices, and a half-field sequential LCD light valve with sub-pixels, utilizing duty cycles and field sequences to reduce bandwidth requirements and response times, while maintaining high brightness and color gamut.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If pure field sequential single LCD projector is implemented, then power consumption is reduced and output brightness is improved, but driver IC bandwidth requirement becomes too high
Solution Approach 1:
The patent divides the LCD panel into multiple regions, each driven by a separate driver IC. This segmentation allows each driver to handle a smaller portion of the overall signal bandwidth, making the system feasible with current manufacturing capabilities while maintaining the power efficiency benefits of field sequential operation.
Solution Approach 2:
The patent transitions from a single-color-field sequential approach to a multi-color simultaneous display approach using divided regions. This dimensional change in the driving methodology allows the system to achieve field sequential power efficiency without requiring prohibitively high bandwidth from a single driver IC.
2Use of energy by moving object
If pure field sequential single LCD projector is implemented, then power consumption is reduced and output brightness is improved, but liquid crystal response speed requirement becomes too high
Solution Approach 1:
By dividing the display into multiple regions that can be updated at different rates, the patent reduces the response speed requirement for each individual region. This segmentation allows the system to achieve acceptable overall performance without requiring extremely fast liquid crystal response times across the entire panel.
Solution Approach 2:
The patent applies field sequential operation selectively to certain regions while using other driving methods in other regions. This partial application allows the system to gain power efficiency benefits without requiring the entire liquid crystal panel to meet excessively high response speed requirements.
3Device complexity
If pure field sequential single LCD projector is implemented, then structure is simplified and energy consumption is reduced, but image quality deteriorates due to smearing and cross color
Solution Approach 1:
The patent divides the display into multiple regions, each with its own driver IC, allowing different driving strategies to be applied to different regions. This segmentation enables the system to maintain simplified field sequential structure in some areas while using alternative methods in other areas to preserve image quality and avoid smearing and cross-color artifacts.
Solution Approach 2:
The patent applies different driving methodologies to different regions of the display based on local requirements. This local quality approach allows the system to maintain the structural simplicity and power efficiency of field sequential operation in regions where it works well, while using other methods in regions where image quality would otherwise deteriorate.
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 significantly reduces driver IC bandwidth, liquid crystal response time, engineering difficulty, and raw material costs, enabling high-efficiency, low-power consumption projectors with improved color gamut and output brightness, suitable for FHD resolution.
Implementation Method 1
an LED light source, which comprises a red light source, a green light source and a blue light source
Implementation Method 2
the collecting and collimating device comprises a red light collecting and collimating module for collecting and collimating the light emitted by the red light source
Implementation Method 3
the light-combining and color-filtering device combines light and filters color for the light emitted by the red light collecting and collimating module
Implementation Method 4
the focusing device focuses the image of the LED light source on the incident end face of the light-homogenizing device to form a real image of the secondary light source
Implementation Method 5
after the light-homogenizing device homogenizes the light of the real image of the secondary light source, the outgoing lens uniformly illuminates the LCD light valve
Implementation Method 6
the LCD light valve is a half-field sequential display light valve with a single base-color color filter
Implementation Method 7
significantly reducing the response time to the liquid crystal
Data Source
AI summary
The disclosure provides a new field sequential single LCD projector, includes an LED light source, a collecting and collimating device, a light-combining and color-filtering device, an intermediate reflector, a focusing device, a light-homogenizing device, an outgoing lens, a LCD light valve, a field lens, an imaging reflector and a projection lens which are arranged in sequence according to the light traveling direction. The LED light source includes a red light source, a green light source and a blue light source. Compared with the existing full-color light valve technology, under the same technical condition, the efficiency of the light valve is greatly improved, the power of the light source is greatly reduced, and the image color gamut is greatly improved, so that the projector can output higher brightness and has vast market adaptability.