Lighting device and projection display device

Abstract

The invention proposes a light-emitting device and a projection display device. The light-emitting device comprises a wavelength conversion device and an excitation source for emitting an exciting light, wherein the light-emitting device also comprises a light splitting and filtering device arranged between light paths of the excitation source and the wavelength conversion device; the light splitting and filtering device divides the exciting light into a first part and a second part; the light splitting and filtering device has different transmission reflection characteristics on the first part and the second part, and guides the first part and the second part to different light channels; the light splitting and filtering device guides the first part to the wavelength conversion device; the light splitting and filtering device guides the excited light emitted by the wavelength conversion device to be separated from the light path of the first path of the exciting light and enters an emergent light channel of the light-emitting device; the light-emitting device also comprises a light absorption device for absorbing the second part of the exciting light. In the light-emitting device disclosed by the invention, highlighted emergent light can be obtained by using the exciting light and the wavelength conversion device, meanwhile, the exciting light of the second part is absorbed by using the light absorption device, so that the color purity of the emergent light is ensured.

Description

technical field [0001] The invention relates to the field of light sources, in particular to a light emitting device and a projection display device using the light emitting device. Background technique [0002] The projection display technology is developing rapidly at present, and the light emitting diode (LED) light source, as a new type of light source, has been widely used in the projection display technology. However, the main problem at present is that the brightness of the LED light source is insufficient. For example, for a light valve of a certain size, its etendue has been determined, that is, the number of LEDs is limited, and insufficient brightness of a single LED directly leads to insufficient luminous flux incident on the light valve. Especially the green LED is the bottleneck of the whole LED light source system. Contents of the invention [0003] In view of the above problems, the present invention proposes a light-emitting device, including a wavelengt...

AI Technical Summary

Problems solved by technology

However, the main problem at present is that the brightness of the LED light source is not enough

For example, for a light valve of a certain size, its etendue has been determined, that is, the number of LEDs is limited, and the insufficient brightness of a single LED directly leads to insufficient luminous flux incident on the light valve.

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