CN2639918Y - Three-plate type projection optical energy capable of improving chroma uniformity - Google Patents
Three-plate type projection optical energy capable of improving chroma uniformity Download PDFInfo
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- CN2639918Y CN2639918Y CN 03255655 CN03255655U CN2639918Y CN 2639918 Y CN2639918 Y CN 2639918Y CN 03255655 CN03255655 CN 03255655 CN 03255655 U CN03255655 U CN 03255655U CN 2639918 Y CN2639918 Y CN 2639918Y
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Abstract
The utility model discloses a three-plate type projection optical engine for improving the uniformity of chromaticity, which comprises a light source, a polarization unit, a color separation unit, three micro display boards, an image combination unit, a projection objective, a projection screen which are positioned in sequence along the propagation direction of the light; wherein, the optical engine also comprises a half wave plate/quarter wave plate which can realize the vibration direction modulation of a red-green-blue tricolored light which passes through the image combination unit, and the half wave plate/quarter wave plate is positioned in the light path between the image combination unit and the projection screen. The red-green-blue tricolored light which passes through the image combination unit can be respectively modulated by the half wave plate/quarter wave plate, and the horizontal or vertical linearly polarized light can be turned by the half wave plate/quarter wave plate; while a quarter wave plate can change the linearly polarized light into a circular or oval polarized light to change the directional characteristic of the linearly polarized light and to adjust the horizontal and the vertical polarized components. The utility model can therefore effectively improve the uniformity of chromaticity of the image projected on the projection screen.
Description
Technical field
The utility model novel relating to, be used for colour projection's display device, more specifically refers to a kind of three-chip type projecting optical engine that improves uniformity of chromaticity.
Background technology
The insider knows, in the single-lens colour projection of three-chip type display device, often Red Green Blue is thrown light on to little display board with polarized light, ECDC synthesizes as system again, the image of these three kinds of different colours is lumped together, by being projected on the same screen after the same projection lens amplification, just finished the Projection Display of coloured image.Light path form with typical three-chip type transflective liquid crystal light engine illustrates its principle.
Typical case's light path as shown in Figure 1,1 be light source, 2 be inclined to one side unit, 3 be to divide a color element, 4,5,6 are respectively three little display boards of red, green, blue, 7 look like the unit for closing, 8 is projection objective, 9 is projection screen.The natural light of white sends from light source 1, after playing inclined to one side unit 2, become the polarized light of vertical direction, and be divided into red, green, blue three coloured light through minute color element 3, red, green, blue three coloured light are radiated at respectively on corresponding little display board 4,5,6 separately, close the ejaculation of picture back by closing as unit 7, red, blue light is the vertical vibrating direction at this moment, and green glow is the horizontal vibration direction, is imaged on the projection screen 9 through projection objective 8 again.
No matter be the front projection or the light engine of back projection, its image planes color is uniformly on the good projection screen of diffusive although throw into, and in the time of on projecting to the screen with reflection or transmission anisotropic properties, causes the inhomogeneous of color toward the contact meeting.Therefore it is blue up and down to occur whole image when many traditional light engines are incident upon on the projection screen, and the phenomenon of left and right sides greening has influence on beholder's viewing effect.Why this phenomenon can occur, be because the level of projection screen and the polarized light of vertical direction have produced different transmission effects, especially bigger visual field to incident angle, and edge situation uniformity of chromaticity is poorer.
As Fig. 2, shown in Figure 3, above-mentioned phenomenon is to adopt the light engine of the three-chip type that transflective liquid crystal (LCD) or reflective liquid crystal (LCOS) manufacture that similar problem is all arranged.We take the typical structure of these two kinds of light engines to compare, find that the light situation that they close as the back outgoing is similar, (generalized case green light level is to vibration to be respectively the linearly polarized light of level or vertical direction when all having produced red, green, blue three coloured light outgoing, red, blue light is vertically to vibration), when light projects on the projection screen of level and vertical direction light reflex or absorption anisotropy again, will make the uniform image field of original colourity, produce colourity deflection in the subregion.In Fig. 2, Fig. 3, comprised light source in the empty frame 10, risen partially, color separation, little display board, closed all unit of picture, and be referred to as system behind the light engine.
Summary of the invention
The purpose of this utility model is at the figure image that is incident upon on the projection screen the uneven shortcoming of color to be arranged at traditional the above-mentioned of light engine existence, and a kind of three-chip type projecting optical engine that improves uniformity of chromaticity is provided.
To achieve these goals, the utility model adopts following two kinds of technical schemes:
Scheme one,
A kind of three-chip type projecting optical engine that improves uniformity of chromaticity comprises the light source that sets gradually along the light ray propagation direction, play inclined to one side unit, divide color element, three little display boards, close the picture unit, projection objective, projection screen, light sends from light source, after playing inclined to one side unit, become the polarized light of vertical direction, and be divided into red through a minute color element, green, blue three color light, red, green, blue three color light is radiated at respectively on corresponding little display board separately, close the ejaculation of picture back by closing as the unit, be imaged on the projection screen again through projection objective, this light engine also comprises can be to ECDC red as after the unit, green, blue three color light carries out 1/2nd wave plates of direction of vibration modulation, and 1/2nd wave plates are in the light path of closing between picture unit and the projection screen.
Scheme two,
A kind of three-chip type projecting optical engine that improves uniformity of chromaticity, this light engine comprises the light source that sets gradually along the light ray propagation direction, play inclined to one side unit, divide color element, three little display boards, close the picture unit, projection objective, projection screen, light sends from light source, after playing inclined to one side unit, become the polarized light of vertical direction, and be divided into red through a minute color element, green, blue three color light, red, green, blue three color light is radiated at respectively on corresponding little display board separately, close the ejaculation of picture back by closing as the unit, be imaged on the projection screen again through projection objective, this light engine also comprises can be to ECDC red as after the unit, green, blue three color light carries out the quarter-wave plate of direction of vibration modulation, and quarter-wave plate is in the light path of closing between picture unit and the projection screen.
Adopted in above-mentioned two kinds of technical schemes at the utility model, light engine comprises also and can carry out 1/2nd wave plates/quarter-wave plate that direction of vibration is modulated as red, green, blue three coloured light after the unit to ECDC that 1/2nd wave plates/quarter-wave plate is in the light path of closing between picture unit and the projection screen./ 2nd wave plates/quarter-wave plate can be rotated level or vertical linearly polarized light modulating respectively from closing red, green, blue three coloured light that come out as the unit; And put into quarter-wave plate, and then make linearly polarized light become circle or elliptically polarized light, to change the directivity characteristics of linearly polarized light, reach the purpose of adjustment level and vertical polarization component, thereby improved the uniformity of chromaticity that projects to the image on the projection screen effectively.
Description of drawings
Fig. 1 is traditional light engine light path principle synoptic diagram.
Fig. 2 is the typical light path principle schematic of traditional transflective liquid crystal (LCD) light engine.
Fig. 3 is the typical light path principle schematic of traditional reflective liquid crystal (LCOS) light engine.
Fig. 4 is the light path principle synoptic diagram after light engine of the present utility model is simplified.
Fig. 5 is a transflective liquid crystal light engine light path principle synoptic diagram for light engine of the present utility model.
Fig. 6 is in light engine of the present utility model, and optical vibration direction is adjusted schematic diagram behind adding 1/2nd wave plates.
Fig. 7 is in light engine of the present utility model, and optical vibration direction is adjusted schematic diagram behind the adding quarter-wave plate.
Embodiment
Please consult earlier shown in Figure 5,
Light engine of the present utility model and traditional light engine, it comprises the light source 1 that sets gradually along the light ray propagation direction, play inclined to one side unit 2, divide color element 3, three little display boards 4,5,6, close picture unit 7, projection objective 8, projection screen 9, light sends from light source 1, after playing inclined to one side unit 2, become the polarized light of vertical direction, and be divided into red, green, blue three coloured light through minute color element 3, red, green, blue three coloured light are radiated at respectively on corresponding little display board 4,5,6 separately, close the ejaculation of picture back by closing, be imaged on again on the projection screen 9 through projection objective 8 as unit 7.
Different is for the utility model and traditional optical engine, this light engine also comprises and can carry out 1/2nd wave plates, 1/21st, two wave plate 21 of direction of vibration modulation in the light path of closing between picture unit 7 and the projection screen 9 as red, green, blue three coloured light after the unit to ECDC.
Specifically,
Described 1/2nd wave plates 21 are in the light path of closing between picture unit 7 and the projection objective 8.
Certainly, in the light path of described 1/2nd wave plates 21 between projection objective 8 and projection screen 9.
Described projection objective 8 can be single eyeglass, also can be a lens set that is made of several pieces single eyeglasses, when being lens set, in the light path of described 1/2nd wave plates 21 between lens set.
Light engine of the present utility model can comprise also and can carry out the quarter-wave plate 41 that direction of vibration is modulated as red, green, blue three coloured light after the unit to ECDC that quarter-wave plate 41 is in the light path of closing between picture unit 7 and the projection screen 9.
Described quarter-wave plate 41 is in the light path of closing between picture unit 7 and the projection objective 8.
Certainly, in the light path of described quarter-wave plate 41 between projection objective 8 and projection screen 9
Equally, described projection objective 8 can be single eyeglass, also can be a lens set, when being lens set, in the light path of described quarter-wave plate 41 between lens set.
What Fig. 5 illustrated is the lens set of projection objective 8 for being made of two eyeglasses.
For simplified illustration problem more, please consult shown in Figure 4ly again, we remove the part of projection objective 8 among this figure, and light engine promptly plays from light source and closes picture unit 7 parts, is referred to as system 10 behind the light engine.Equally, in Fig. 5,10 also represent system behind the light engine.
Therefore, 41 of 1/2nd wave plates 21 or quarter-wave plates place behind the light engine before system 10 backs, the projection screen 9, when adding 1/ 2nd wave plates 21,21 pairs of red, green, blue three coloured light of 1/2nd wave plates are modulated respectively, change their level and vertical component, thereby improved the uniformity of chromaticity of projected image effectively.In addition, / 2nd wave plates 21 can also be placed on two dotted line position places, promptly shown in Figure 4, closing between picture unit 7 and the projection objective 8 or in projection objective 8 or between projection objective 8 and projection screen 9), level or vertical linearly polarized light are rotated, thereby change the linear polarization direction of light, reach the purpose of adjustment level and vertical polarized component, thereby improve uniformity of chromaticity.
Its principle please is described as follows in conjunction with Fig. 6: because red, green, blue three coloured light are linearly polarized light after closing picture, the generalized case green glow is a horizontal polarization light, the vertical polarized light of red, blue light.Although the uniformity of chromaticity of common light engine is fine, but when throwing on projection screen 9, because the inhomogeneous of colourity will appear in its anisotropic characteristic, especially obvious for this situation of rear projection screen, produce hyp colour band blue up and down, left and right sides greening.After having added 1/2nd wave plates 41, adjust a, β angle, make level and vertical linearly polarized light rotate suitable angle, be commonly used in 45 degree directions, so it is the component of level and vertical direction just the same (or can adjust as required), and anisotropy is just inoperative to them
Please again in conjunction with shown in Figure 7, when changing 1/2nd wave plates in the light engine into quarter-wave plate, by adjusting a, β angle, can make the linearly polarized light of original red, green, blue three looks become circle or elliptically polarized light left-handed, dextrorotation, adjust their level and vertical polarized component like this, thereby reached the purpose of adjusting uniformity of chromaticity.
Among Fig. 6, Fig. 7, dot-and-dash line is represented fast axis, and dotted arrow is represented incident light, and solid arrow is represented emergent light.
Claims (8)
1, a kind of three-chip type projecting optical engine that improves uniformity of chromaticity, this light engine comprises the light source that sets gradually along the light ray propagation direction, play inclined to one side unit, divide color element, three little display boards, close the picture unit, projection objective, projection screen, light sends from light source, after playing inclined to one side unit, become the polarized light of vertical direction, and be divided into red through a minute color element, green, blue three color light, red, green, blue three color light is radiated at respectively on corresponding little display board separately, close the ejaculation of picture back by closing as the unit, be imaged on the projection screen again through projection objective, it is characterized in that: this light engine also comprises can be to ECDC red as after the unit, green, blue three color light carries out 1/2nd wave plates of direction of vibration modulation, and 1/2nd wave plates are in the light path of closing between picture unit and the projection screen.
2, the three-chip type projecting optical engine that improves uniformity of chromaticity as claimed in claim 1 is characterized in that: described 1/2nd wave plates are in the light path of closing between picture unit and the projection objective.
3, the three-chip type projecting optical engine that improves uniformity of chromaticity as claimed in claim 1, it is characterized in that: described projection objective can be a lens set, in the light path of described 1/2nd wave plates between lens set.
4, the three-chip type projecting optical engine that improves uniformity of chromaticity as claimed in claim 1 is characterized in that: in the light path of described 1/2nd wave plates between projection objective and projection screen.
5, a kind of three-chip type projecting optical engine that improves uniformity of chromaticity, this light engine comprises the light source that sets gradually along the light ray propagation direction, play inclined to one side unit, divide color element, three little display boards, close the picture unit, projection objective, projection screen, light sends from light source, after playing inclined to one side unit, become the polarized light of vertical direction, and be divided into red through a minute color element, green, blue three color light, red, green, blue three color light is radiated at respectively on corresponding little display board separately, close the ejaculation of picture back by closing as the unit, be imaged on the projection screen again through projection objective, it is characterized in that: this light engine also comprises can be to ECDC red as after the unit, green, blue three color light carries out the quarter-wave plate of direction of vibration modulation, and quarter-wave plate is in the light path of closing between picture unit and the projection screen.
6, the three-chip type projecting optical engine that improves uniformity of chromaticity as claimed in claim 5 is characterized in that: described quarter-wave plate is in the light path of closing between picture unit and the projection objective.
7, the three-chip type projecting optical engine that improves uniformity of chromaticity as claimed in claim 5, it is characterized in that: described projection objective can be a lens set, in the light path of described quarter-wave plate between lens set.
8, the three-chip type projecting optical engine that improves uniformity of chromaticity as claimed in claim 5 is characterized in that: in the light path of described quarter-wave plate between projection objective and projection screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03255655 CN2639918Y (en) | 2003-07-16 | 2003-07-16 | Three-plate type projection optical energy capable of improving chroma uniformity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03255655 CN2639918Y (en) | 2003-07-16 | 2003-07-16 | Three-plate type projection optical energy capable of improving chroma uniformity |
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| CN2639918Y true CN2639918Y (en) | 2004-09-08 |
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| CN 03255655 Expired - Fee Related CN2639918Y (en) | 2003-07-16 | 2003-07-16 | Three-plate type projection optical energy capable of improving chroma uniformity |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100380173C (en) * | 2005-04-26 | 2008-04-09 | 富士能株式会社 | Projection display device |
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2003
- 2003-07-16 CN CN 03255655 patent/CN2639918Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100380173C (en) * | 2005-04-26 | 2008-04-09 | 富士能株式会社 | Projection display device |
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| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |