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Projection display device

A display device and projection technology, which is applied to projection devices, televisions, optics, etc., can solve the problems of shortening, low light utilization efficiency, temperature rise of light source lamps, etc. The effect of efficiency

Inactive Publication Date: 2011-08-31
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, in the device described in Patent Document 1, since the two light source lamps are opposed to each other with a prism interposed therebetween, the ratio of the lost light of the light source lamps to the light emitting unit of the opposing light source lamp increases, resulting in low light utilization efficiency. Problem, and the problem that the life of the light source lamp is shortened due to the temperature rise of the light source lamp due to the incidence of loss light

Method used

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Experimental program
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Embodiment approach 1

[0024] figure 1 It is a diagram schematically showing the configuration of the projection display device according to Embodiment 1 of the present invention. Such as figure 1 As shown, the projection display device according to Embodiment 1 includes: a light source device 10 that emits light beams with uniform intensity; modulated to be converted into image light L4 ; and a projection optical system 62 that magnifies and projects the image light L4 onto a screen 63 . figure 1 The reflective image display element 61 is shown, but the image display element 61 may also be a transmissive image display element. The image display element 61 is, for example, a liquid crystal light valve, a digital micromirror device (DMD: Digital Micromirror Device), or the like. In the case of a rear projection type projection display device, the screen 63 is a part of the projection display device. Furthermore, the arrangement of the light source device 10, the image display element 61, the proj...

Embodiment approach 2

[0048] Figure 9 It is a diagram schematically showing the configuration of the light source device 20 of the projection display device according to Embodiment 2 of the present invention. Figure 9 The light source device 20 shown can be used as figure 1 The light source device of the projection display device shown in (Embodiment 1). Figure 9 In the first light source lamp 21, the second light source lamp 22, the first bending mirror 23, the second bending mirror 24 and the light intensity equalizing element 25, respectively and figure 1 The structures of the first light source lamp 11, the second light source lamp 12, the first folding mirror 13, the second folding mirror 14 and the light intensity equalizing element 15 are the same. Figure 9 The illuminants 21a and 22a, the elliptical mirrors 21b and 22b, the optical axes 21c and 22c, the incident end 25a, the outgoing end 25b and the optical axis 25c are respectively connected with figure 1 The illuminants 11a and 12a...

Embodiment approach 3

[0051] Figure 10 It is a diagram schematically showing the configuration of the light source device 30 of the projection display device according to Embodiment 3 of the present invention. Figure 10 The light source device 30 shown can be used as figure 1 The light source device of the projection display device shown in (Embodiment 1). Figure 10 The first light source lamp 31, the second light source lamp 32, the first bending mirror 33, the second bending mirror 34 and the light intensity uniformizing element 35 in the figure 1 The structures of the first light source lamp 11, the second light source lamp 12, the first folding mirror 13, the second folding mirror 14 and the light intensity equalizing element 15 are the same. Figure 10 The illuminants 31a and 32a, the elliptical mirrors 31b and 32b, the optical axes 31c and 32c, the incident end 35a, the outgoing end 35b and the optical axis 35c are respectively connected with figure 1 The illuminants 11a and 12a, the el...

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Abstract

A projection display device having high efficiency of light utilization and provided with a light source device having a long service life is provided. The projection display device comprises: first and second light source lamps (11, 12); a light intensity uniformizing element (15); first and second bending mirrors (13, 14); an image display element (61) for modulating a light flux (L3) emitted from the light intensity uniformizing element (15) to convert the light flux into image light (L4); and a projection optical system (62) for projecting the image light onto a screen (63), wherein the first light source lamp (11), the second light source lamp (12), the first bending mirror (13), and the second bending mirror (14) are arranged in such a manner that the first optical axis (11c) of thefirst light source lamp (11) does not coincide with the second optical axis (12c) of the second light source lamp (12) and that the first distance from the first bending mirror (13) to a light incident end (15a) is different from the second distance from the second bending mirror (14) to the light incident end (15a).

Description

technical field [0001] The present invention relates to a projection display device using a plurality of light source lamps. Background technique [0002] In order to achieve a larger screen size and higher brightness of an image displayed by a projection display device, a projection display device including a multi-lamp light source device having a plurality of light source lamps has been proposed. For example, in Patent Document 1 (paragraphs 0013 to 0018 of Japanese Patent Application Laid-Open No. 2001-359025, figure 1 ) proposes a light source device for a projection-type display device that combines light beams from two light source lamps disposed opposite to each other using a prism disposed near a converging point of the light source lamps. [0003] patent documents [0004] Patent Document 1: Japanese Patent Laid-Open No. 2001-359025 [0005] However, in the device described in Patent Document 1, since the two light source lamps are opposed to each other with a p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B21/14H04N5/74
CPCG03B21/14H04N9/3152H04N9/3164G03B21/2053G03B21/2013G03B21/2066H04N5/74
Inventor 小岛邦子木田博
Owner MITSUBISHI ELECTRIC CORP