Projection display system and control method thereof

Abstract

The invention discloses a control method of a projection display system. The projection display system comprises a liquid crystal light modulation device and a light emitting device capable of emitting time sequence light laser and fluorescent light which have spectrum overlapping. The control method includes: acquiring basic-color image signals in a source image signal after being decoded; converting each basic color image signal in the decoded source image signal into a corresponding basic color modulation control signal, controlling the liquid crystal light modulation device to modulate time sequence light through the basic color modulation control signals; in the process when a first basic color modulates the control signals, modulating laser of time sequence and at least part of fluorescent light by the liquid crystal light modulation device, wherein brightness after spectrum overlapped laser is mixed with fluorescent light is identical with that of corresponding basic color image signals in source image signals after being decoded, and color coordinates after the laser is mixed with the fluorescent light are identical with those of the corresponding basic color image signals in the source image signals after being decoded. In this way, basic-color light which is good in both brightness and color coordinates is acquired.

Description

technical field [0001] The present invention relates to the field of optics, more specifically to the field of projection display. Background technique [0002] At present, spatial light modulators are widely used in the field of projection display. Liquid crystal projection systems represented by LCD and LCOS are applied to various scenes in life due to their low cost and mature technology. Generally, liquid crystal projection systems are divided into single-chip and three-chip types. With the improvement of the performance of liquid crystal devices, especially the improvement of response speed, the performance of liquid crystal devices including ferroelectric liquid crystal and blue-phase liquid crystal (blue-phase liquid crystal) The emergence of single-chip liquid crystal projection systems can be realized. In terms of the light source of the liquid crystal projection system, light bulbs or LEDs are generally used as the light source. The light bulbs have problems of li...

AI Technical Summary

Problems solved by technology

At present, whether it is a transmissive color wheel or a reflective color wheel, if the blue excitation light and the red laser wavelength are combined and then incident on the orange phosphor at the same time, the scheme of combining the red laser and the orange fluorescent etendue will make the red The utilization efficiency of optical laser is not high

Due to the high cost of red laser, the low utilization rate is not good for the cost of the system. Therefore, how to realize a high-efficiency laser-fluorescent light-combining solution applied to the liquid crystal projection system has become an urgent demand.

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