Light emitting device, projection display device and light emitting system
A light-emitting device and light-emitting surface technology, which is applied in the field of light sources, can solve problems such as loss of efficiency, inability to use light, and inability to match light valves with aspect ratios, and achieve the effect of improving efficiency
Inactive Publication Date: 2014-05-07
吴震
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Problems solved by technology
[0005] However, an important problem with light-emitting diodes as light sources is that since the projection screen is generally a 4:3 or 16:9 rectangle, the light valve must match it, that is, the light valve is also a 4:3 or 16:9 rectangle
The light-emitting surface of the light-emitting diode is rectangular, and its aspect ratio often cannot match the aspect ratio of the light valve very well.
In this way, when the light emitted by the light-emitting diode is imaged onto the modulation surface of the light valve, in order to cover all the modulation surface of the light valve, part of the light on the image plane of the light-emitting diode cannot be used, which results in a loss of efficiency.
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[0026] The present invention proposes a light-emitting device, the structural schematic diagram of the first embodiment is as follows Figure 1a and 1b shown. The light-emitting device includes a light-emitting diode light source 101, the light-emitting surface of the light-emitting diode light source 101 is a rectangle, and the direction of two adjacent sides of the rectangle is the x direction and the y direction respectively. Figure 1a represents the front view of the light-emitting device viewed along the direction of the y direction, and Figure 1b It shows the front view of the light-emitting device viewed along the x direction (see the coordinate system in the lower left corner of the two figures). understandable, in Figure 1a The length of the light-emitting diode light source 101 is the length of its side in the direction x, and Figure 1b The length of the light emitting diode light source 101 is the length of the side along the y direction. It can be clearly see...
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The invention provides a light emitting device, a projection display device and a light emitting system. A light emitting diode light source is comprised. A light emitting surface of the light emitting diode light source is rectangular, wherein the directions of two adjacent sides of the rectangle are respectively X and Y directions. A light collection lens is further comprised and is used for collecting lights emitted by the light emitting diode light source. The light collection lens at least comprises an optical curved surface. Intersection lines, which pass though an optical axis in X and Y directions, of the optical curved surface have different shapes, so that the light collection lens has different focal lengths in X and Y directions. According to the invention, the amplification factor of an outgoing light of the light emitting device in two mutually perpendicular directions can be separately controlled; the length-width ratio of the outgoing light is not limited by the light emitting diode light source; and through reasonable design, the light emitting device is matched with an optical system on the rear end to improve the efficiency.
Description
[0001] technical field [0002] The invention relates to the field of light sources, in particular to a light emitting device, a projection display device and a light emitting system using the light emitting device. [0003] Background technique [0004] Projection display technology is currently developing rapidly. The principle of projection display is to use a light source to provide a light beam, which is irradiated on a light valve, and the light valve modulates the light to carry image information, and the light carrying image information is then projected by a projection lens to form projected image. Traditionally, high-pressure mercury lamps are used as light sources. In recent years, light-emitting diode (LED) light sources have been widely used in projection display technology as a new type of light source. Its advantage is that its lifespan is more than ten times longer than traditional light sources. [0005] However, an important problem with light-emitting d...
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IPC IPC(8): G03B21/20G03B21/14F21V5/04F21V13/02F21V13/04F21Y101/02F21Y115/10
Inventor 吴震
Owner 吴震