CN1847971B - Projection LCD - Google Patents
Projection LCD Download PDFInfo
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- CN1847971B CN1847971B CN200510059955A CN200510059955A CN1847971B CN 1847971 B CN1847971 B CN 1847971B CN 200510059955 A CN200510059955 A CN 200510059955A CN 200510059955 A CN200510059955 A CN 200510059955A CN 1847971 B CN1847971 B CN 1847971B
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- light
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- liquid crystal
- coloured light
- beam splitter
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Abstract
The projection LCD includes a light source, a color wheel, a polarized light beam separator, a first space light modulator, a second space light modulator and a projecting lens. The white light the light source emits is converted in the color wheel into color light, the color light is split in the polarized light beam separator into one first color light and one second color light in different polarization directions, and the first color light and the second color light leave from the polarized light beam separator in different direction. Then, the first color light and the second color light are modulated separately in the first space light modulator and the second space light modulator before being reflected back to the polarized light beam separator. The projecting lens is set in the light path of the modulated first color light and second color light after the polarized light beam separator to project the modulated first color light and second color light to form image.
Description
Technical field
The present invention relates to a kind of projection display equipment, and particularly relate to a kind of liquid crystal projection display.
Background technology
Development along with the video signal technology, liquid crystal (liquid crystal) display technique is widely used in the daily life gradually, LCD screen (Liquid Crystal Display as LCD TV, notebook computer (Notebook) or desktop PC, and liquid crystal projector etc. LCD).Wherein, liquid crystal projector is one of important technology of large scale screen display.The structure of liquid crystal projector mainly can be divided into illumination section, color-separation and color-recombination part and imaging moiety.
Fig. 1 is the synoptic diagram of known three-chip type reflective liquid crystal projection system, and Fig. 2 is the synoptic diagram of known one chip reflective liquid crystal projection system.As shown in Figure 1, three-chip type reflective liquid crystal projection system 100 comprises light source 110, lens arra (lens array) 120, polarization conversion system (Polarization Conversion System, PCS) 130, two dichroic mirrors (dichroicmirror) 140a, 140b, a plurality of catoptron 150a, 150b, 150c, a plurality of polarization beam splitter (Polarization Beam Splitter, PBS) 170R, 170G, 170B, a plurality of reflection type liquid crystal panel 160R, 160G, 160B, light-combining prism 180 and projecting lens (projectorlens) 190.
Wherein, behind the white light W scioptics array 120 that light source 110 is sent, can be more even, concentrate and incident polarization converting system 130 abreast.Simultaneously, white light W can be converted into the white light W of single polarization direction and incident dichroic mirror 140a after the effect of polarization conversion system 130.Wherein, the penetrable dichroic mirror 140a of ruddiness R that white light W is contained enters polarization beam splitter 170R through the reflection of catoptron 150a again.Polarization beam splitter 170R can reflex to ruddiness R reflection type liquid crystal panel 160R, and ruddiness R can pass through the modulation of reflection type liquid crystal panel 160R and have image information this moment, and reflected back polarization beam splitter 170R.Ruddiness R after the modulation can penetrate polarization beam splitter 170R, and in light-combining prism 180 with modulation after green glow G and blue light B close light, form image by projecting lens 190 and projection again.Though known polarization conversion system 130 can be changed the polarization direction of light the loss with minimizing luminous energy, yet because the conversion efficiency of polarization conversion system 130 has only 60%～70% or lower, therefore causes the service efficiency of light not high.
In addition, as shown in Figure 2, one chip reflective liquid crystal projection system 200 comprises light source 210, colour wheel 220, integration rod (integral rod) 230, polaroid 240, polarization beam splitter 250, reflection type liquid crystal panel 260 and projecting lens 270.After light source 210 sends white light W, tell R, G or B coloured light continuously by colour wheel 220, modulate by integration rod 230, polaroid 240, polarization beam splitter 250 and 260 pairs of coloured light of reflection type liquid crystal panel again, finish full-color demonstration at last by the image projecting of projecting lens 270, and by the storage effect of image with each coloured light.In the one chip reflective liquid crystal projection system 200, the light that need obtain particular polarization enters into polarization beam splitter 250 and reflection type liquid crystal panel 260, further light is modulated.Therefore make the light with a certain polarization direction pass through by polaroid 240, the light of another polarization direction then can not pass through, but but causes the utilization ratio of its light not high.
From the above, because the beam split in the three-chip type reflective liquid crystal projection system with to close photoreduction process too complicated, has influence on brightness and other optical appearance of liquid crystal projector so can cause the loss of light quantity.In addition, the volume of three-chip type reflective liquid crystal projection system is too huge, also is unfavorable for the development trend of equipment miniaturization.In addition, in the one chip reflective liquid crystal projection system,, so significantly reduced the light utilization ratio of total system because half the light of only having an appointment can pass through polaroid.
Summary of the invention
Purpose of the present invention just provides a kind of liquid crystal projection display, and it is suitable for the light utilization ratio that provides higher, but and the design of implement device miniaturization.
The present invention proposes a kind of liquid crystal projection display, comprises light source, colour wheel, polarization beam splitter, first spatial light modulator (spatial light modulator), second spatial light modulator and projecting lens.This light source is suitable for sending white light.Colour wheel is arranged on the optical path of white light, in order to being coloured light with white light conversion.Polarization beam splitter is arranged on the optical path of coloured light, in order to being first coloured light and second coloured light with different polarization direction with the coloured light beam split, and makes first coloured light leave this polarization beam splitter with second coloured light along different directions.First spatial light modulator is arranged on the optical path of first coloured light, in order to modulate first coloured light and with its reflected back polarization beam splitter.Second spatial light modulator is arranged on the optical path of second coloured light, in order to modulate second coloured light and with its reflected back polarization beam splitter.Projecting lens is arranged on the optical path of modulated first coloured light and second coloured light after the polarization beam splitter, forms image in order to projection first coloured light and second coloured light.
According to the described liquid crystal projection display of preferred embodiment of the present invention, above-mentioned colour wheel for example has Red lightscreening plate, green color filter and blue color filter.First spatial light modulator for example is a reflection type liquid crystal panel.Second spatial light modulator for example is a reflection type liquid crystal panel.Liquid crystal projection display for example also comprises the invisible light filter, is arranged on the optical path of the white light between light source and colour wheel, in order to invisible light part in the filtering white light.
In addition, liquid crystal projection display for example also comprises integration rod, and it is arranged on the optical path of white light between light source and polarization beam splitter or coloured light.Liquid crystal projection display also can comprise at least one plus lens, and it is arranged on the optical path of coloured light between colour wheel and polarization beam splitter.Liquid crystal projection display yet can comprise a plurality of lens, and it is arranged on the optical path of white light between light source and polarization beam splitter or coloured light.
In sum, in the present invention's liquid crystal projection display, because therefore the negligible amounts of the optical element that is adopted can simplify whole optical system, and then the design of implement device miniaturization.In addition, owing to need not use polaroid, therefore can promote the service efficiency of light, and then improve the display quality and the brightness of liquid crystal projection display.
State with other purpose, feature and advantage and can become apparent on the present invention for allowing, preferred embodiment cited below particularly, and conjunction with figs. are described in detail below.
Description of drawings
Fig. 1 is the synoptic diagram of known three-chip type reflective liquid crystal projection system.
Fig. 2 is the synoptic diagram of known one chip reflective liquid crystal projection system.
Fig. 3 is the synoptic diagram of the liquid crystal projection display of first embodiment of the invention.
Fig. 4 is the synoptic diagram of coloured light incident polarization beam splitter.
Fig. 5 is the coloured light incident polarization beam splitter of P polarization direction and the synoptic diagram of spatial light modulator.
Fig. 6 is the coloured light incident polarization beam splitter of S polarization direction and the synoptic diagram of spatial light modulator.
Fig. 7 is the light incident polarization beam splitter of not polarization and the synoptic diagram of spatial light modulator.
Fig. 8 is the synoptic diagram of the liquid crystal projection display of second embodiment of the invention.
The main element description of symbols
100: the three-chip type reflective liquid crystal projection system
110: light source
120: lens arra
130: polarization conversion system
140a, 140b: dichroic mirror
150a, 150b, 150c: catoptron
160R, 160G, 160B: reflection type liquid crystal panel
170R, 170G, 170B: polarization beam splitter
180: light-combining prism
190: projecting lens
200: the one chip reflective liquid crystal projection system
210: light source
220: colour wheel
230: integration rod
240: polaroid
250: polarization beam splitter
260: reflection type liquid crystal panel
270: projecting lens
300,400: the present invention's liquid crystal projection display
310: light source
312: bulb
314: reflex housing
320: colour wheel
320R: Red lightscreening plate
320G: green color filter
320B: blue color filter
330: polarization beam splitter
340,350: spatial light modulator
360: projecting lens
370: the invisible light filter
380: integration rod
385: lens
390: plus lens
P
R: the ruddiness with P polarization direction
P
G: the green glow with P polarization direction
P
B: the blue light with P polarization direction
S
R: the ruddiness with S polarization direction
S
G: the green glow with S polarization direction
S
B: the blue light with S polarization direction
S, P: polarization direction
R, G, B: coloured light
W: white light
W ': the white light of filtering invisible light part
Embodiment
[first embodiment]
Fig. 3 is the synoptic diagram of the liquid crystal projection display of first embodiment of the invention.Please refer to Fig. 3, this liquid crystal projection display 300 mainly comprises light source 310, colour wheel 320, polarization beam splitter 330, two spatial light modulators 340,350 and projecting lens 360.
As shown in Figure 3, light source 310 for example comprises bulb 312 and reflex housing 314, and the white light W that bulb 312 is sent is through the outwards ejaculation of the concentrated back of reflex housing 314.Colour wheel 320 is arranged on the optical path of white light W, in order to white light W is converted to coloured light such as for example red, green or indigo plant.In one of the present invention preferred embodiment, this colour wheel 320 for example has Red lightscreening plate 320R, green color filter 320G and blue color filter 320B.When white light W passed through colour wheel 320, the part of incident Red lightscreening plate 320R was then for ruddiness R passes through, and the generation type of other green glow G and blue light B also similarly.Simultaneously, the shared area of Red lightscreening plate 320R, green color filter 320G and blue color filter 320B can be same to each other or different to each other, and adjusts when looking design.
Spatial light modulator 340 is arranged on the optical path of coloured light S, and in order to modulation coloured light S and with its reflected back polarization beam splitter 330, and spatial light modulator 350 is arranged on the optical path of coloured light P, in order to modulation coloured light P and with its reflected back polarization beam splitter 330.In one of the present invention preferred embodiment, spatial light modulator 340 and 350 for example is a reflection type liquid crystal panel, and it can modulate light and make light carrying image information.Reflection type liquid crystal panel for example be the monocrystalline silicon reflection type liquid crystal panel (Liquid Crystal on Silicon panel, LCOSpanel).
Projecting lens 360 is arranged on the optical path of modulated coloured light S and coloured light P after the polarization beam splitter 330, forms image in order to projection coloured light S and coloured light P.
As shown in Figure 3, in one of the present invention preferred embodiment, this liquid crystal projection display 300 for example also comprises optical elements such as invisible light filter 370, integration rod 380 and plus lens 390.Wherein, invisible light filter 370 for example is arranged on the optical path of white light W of 320 of light source 310 and colour wheels, and it is suitable for invisible light part among the filtering white light W (as ultraviolet ray and infrared ray etc.).Integration rod 380 is arranged on the optical path of coloured light such as red, green or indigo plant between colour wheel 320 and the polarization beam splitter 330, and integration rod 380 also can be arranged on the optical path of white light W between light source 310 and the colour wheel 320 certainly.The effect of integration rod 380 is even, concentrated and ejaculations parallel to each other with the light of incident.Plus lens 390 for example is arranged on the optical path of coloured light such as red, green or indigo plant between colour wheel 320 and the polarization beam splitter 330.
Please continue with reference to Fig. 3, the white light W that light source 310 sends is in liquid crystal projection display 300, and by the processing of above-mentioned each optical element, last projectable goes out image.In one of the present invention preferred embodiment, at first, the white light W that light source 310 sends by invisible light part among the invisible light filter 370 filtering white light W (as ultraviolet ray and far infrared etc.) to obtain white light W '.Then, white light W ' is by Red lightscreening plate 320R, green color filter 320G on the colour wheel 320 or the effect of blue color filter 320B, so that white light W ' beam split is obtained coloured light such as red, green or indigo plant.This coloured light can be again by integration rod 380 and plus lens 390 back incident polarization beam splitter 330.
Fig. 4 is the synoptic diagram of coloured light incident polarization beam splitter. as shown in Figure 4, during hot, green or blue light incident polarization beam splitter 330, it has the S polarization direction respectively can be because of the different phenomenons that reflection arranged or penetrate of polarization direction with the part of P polarization direction.
Fig. 5 is the coloured light incident polarization beam splitter of P polarization direction and the synoptic diagram of spatial light modulator, and Fig. 6 is the coloured light incident polarization beam splitter of S polarization direction and the synoptic diagram of spatial light modulator.As shown in Figure 5, the ruddiness P that has the P polarization direction
R, green glow P
GOr blue light P
BAfter entering polarization beam splitter 330, can pass through this polarization beam splitter 330 and incident spatial light modulator 350.The ruddiness P of P polarization direction
R, green glow P
GOr blue light P
BAfter by spatial light modulator 350 reflections, its polarisation of light direction also can be transformed into the S polarization direction, just has ruddiness, green glow and the blue light (P of P polarization direction
R, P
GWith P
B) can be changed over ruddiness, green glow and blue light (S by spatial light modulator 350 with S polarization direction
R, S
GWith S
B), and the carrying image information.Then, the ruddiness, green glow and the blue light (S that have the S polarization direction
R, S
GWith S
B) after being reflected back toward polarization beam splitter 330, will reflect by polarized beam splitter 330.
As shown in Figure 6, the ruddiness S that has the S polarization direction
R, green glow S
GOr blue light S
BAfter entering polarization beam splitter 330, polarized beam splitter 330 reflects and incident spatial light modulator 340.Ruddiness S with S polarization direction
R, green glow S
GOr blue light S
BAfter by spatial light modulator 340 reflections, its polarisation of light direction also can be transformed into the P polarization direction, just has ruddiness, green glow and the blue light (S of S polarization direction
R, S
GWith S
B) can be changed over ruddiness, green glow and blue light (P by spatial light modulator 340 with P polarization direction
R, P
GWith P
B), and the carrying image information.Then, the ruddiness, green glow and the blue light (P that have the P polarization direction
R, P
GWith P
B) after being reflected back toward polarization beam splitter 330, can pass through this polarization beam splitter 330.
Fig. 7 is the light incident polarization beam splitter of not polarization and the synoptic diagram of spatial light modulator.As shown in Figure 7, after the light incident polarization beam splitter 330 that comprises S and P polarization direction without polarization simultaneously, as aforementioned collocation Fig. 5 and the described phenomenon of Fig. 6, the light of S polarization direction and P polarization direction can be modulated by spatial light modulator 340,350 respectively, and becomes the P polarization direction of carrying image information and the light of S polarization direction.
Please continue with reference to Fig. 3 and Fig. 7, coloured light such as red, green or indigo plant are through after the beam split of polarization beam splitter 330 and two spatial light modulators 340,350, modulating and close light, can form the coloured light that has image data, this coloured light can form monochromatic image by projecting lens 360 with its projection again.Simultaneously, by the collocation of colour wheel 320 with spatial light modulator 340,350, projection in regular turn goes out monochromatic images such as red, green or indigo plant, and reaches the purpose of full-color demonstration by the storage effect of image of all kinds.
[second embodiment]
Fig. 8 is the synoptic diagram of the liquid crystal projection display of second embodiment of the invention.Please refer to Fig. 8, optical element similar or identical in this liquid crystal projection display 400 and the liquid crystal projection display 300 carries out mark with same numeral, and it comprises light source 310, colour wheel 320, polarization beam splitter 330, spatial light modulator 340,350 and projecting lens 360.In second embodiment of the invention, liquid crystal projection display 400 for example also comprises optical elements such as invisible light filter 370, a plurality of lens 385 and plus lens 390.Wherein, a plurality of lens 385 are arranged on the optical path of white light between light source 310 and the polarization beam splitter 330 or coloured light.The setting of above-mentioned optical element is similar or identical with the action principle of the optical element described in the action principle and first embodiment, is not given unnecessary details at this.
In the present embodiment, the light that light source 310 is sent is by invisible light filter 370 filtering invisible lights part backs (ultraviolet light or infrared light), after carrying out optically focused by a plurality of lens 385 and plus lens 390 earlier, form coloured light such as red, green or indigo plant by colour wheel 320 again.This coloured light continues to enter polarization beam splitter 330 and spatial light modulator 340,350 again, through modulation form have the light of image data after, the projection by projecting lens 360 forms image.
In sum, the present invention's liquid crystal projection display has following advantage:
(1) the optical system framework is simple, the volume that is suitable for dwindling optical system with promote liquid crystal projection display in the use convenience and save cost.
(2) owing to need not use polaroid or polarization conversion system, and has the part of two kinds of different polarization directions in the light that can utilize light source fully and provided, so can reduce the loss of light.Therefore, the present invention's liquid crystal projection display is compared the output quantity that can increase light with known LCD projecting system and is reached more than 40%.
Though the present invention discloses as above with preferred embodiment; right its is not in order to qualification the present invention, any described those skilled in the art, without departing from the spirit and scope of the invention; when can doing a little change and improvement, so the present invention's protection domain is as the criterion when looking the claim person of defining.
Claims (8)
1. liquid crystal projection display is characterized in that comprising:
Light source is suitable for sending white light;
Colour wheel is arranged on the optical path of above-mentioned white light, in order to being coloured light with above-mentioned white light conversion;
Polarization beam splitter is arranged on the optical path of above-mentioned coloured light, in order to being to have first coloured light of different polarization direction and second coloured light with above-mentioned coloured light beam split, and makes this first coloured light leave this polarization beam splitter with this second coloured light along different directions;
First spatial light modulator is arranged on the optical path of above-mentioned first coloured light, in order to modulate above-mentioned first coloured light and with the above-mentioned polarization beam splitter of its reflected back;
Second spatial light modulator is arranged on the optical path of above-mentioned second coloured light, in order to modulate above-mentioned second coloured light and with the above-mentioned polarization beam splitter of its reflected back; And
Projecting lens is arranged on the optical path of modulated above-mentioned first coloured light and above-mentioned second coloured light after the above-mentioned polarization beam splitter, forms image in order to above-mentioned first coloured light of projection and above-mentioned second coloured light.
2. liquid crystal projection display according to claim 1 is characterized in that above-mentioned colour wheel has Red lightscreening plate, green color filter and blue color filter.
3. liquid crystal projection display according to claim 1 is characterized in that above-mentioned first spatial light modulator comprises reflection type liquid crystal panel.
4. liquid crystal projection display according to claim 1 is characterized in that above-mentioned second spatial light modulator comprises reflection type liquid crystal panel.
5. liquid crystal projection display according to claim 1 is characterized in that also comprising the invisible light filter, is arranged on the optical path of above-mentioned white light between above-mentioned light source and above-mentioned colour wheel, in order to invisible light part in the above-mentioned white light of filtering.
6. liquid crystal projection display according to claim 1 is characterized in that also comprising integration rod, is arranged on the optical path of above-mentioned white light between above-mentioned light source and above-mentioned polarization beam splitter or above-mentioned coloured light.
7. according to claim 1 or 6 described liquid crystal projection displays, it is characterized in that also comprising at least one plus lens, be arranged on the optical path of above-mentioned coloured light between above-mentioned colour wheel and above-mentioned polarization beam splitter.
8. liquid crystal projection display according to claim 1 is characterized in that also comprising a plurality of lens, is arranged on the optical path of above-mentioned white light between above-mentioned light source and above-mentioned polarization beam splitter or above-mentioned coloured light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200510059955A CN1847971B (en) | 2005-04-04 | 2005-04-04 | Projection LCD |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200510059955A CN1847971B (en) | 2005-04-04 | 2005-04-04 | Projection LCD |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1847971A CN1847971A (en) | 2006-10-18 |
| CN1847971B true CN1847971B (en) | 2010-05-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200510059955A Expired - Fee Related CN1847971B (en) | 2005-04-04 | 2005-04-04 | Projection LCD |
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| Country | Link |
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| CN (1) | CN1847971B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102645826A (en) * | 2011-11-10 | 2012-08-22 | 深圳市光峰光电技术有限公司 | Light source system, illuminating device and projecting device |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2903199A1 (en) * | 2006-06-30 | 2008-01-04 | Thomson Licensing Sas | OPTICAL SYSTEM FOR PROJECTOR AND PROJECTOR CORRESPONDING |
| CN102279507B (en) * | 2010-06-12 | 2013-04-03 | 上海丽恒光微电子科技有限公司 | Projection display device |
| TWI412871B (en) | 2010-10-27 | 2013-10-21 | Hon Hai Prec Ind Co Ltd | Projector device with projection brightness adjustment function and method thereof |
| CN102012614A (en) * | 2010-10-28 | 2011-04-13 | 鸿富锦精密工业（深圳）有限公司 | Projection device with function of automatically adjusting projection brightness and method |
| TWI410740B (en) * | 2010-12-14 | 2013-10-01 | Delta Electronics Inc | Illumination system and projection device comprising the same |
| CN104252094B (en) * | 2012-09-28 | 2017-03-29 | 深圳市绎立锐光科技开发有限公司 | Colour wheel and optical projection system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1362632A (en) * | 2000-12-28 | 2002-08-07 | Lg电子株式会社 | Image projector |
| CN1527128A (en) * | 2003-03-03 | 2004-09-08 | 明基电通股份有限公司 | Projecting display with invisible light reflecting plate for dispersing heat energy |
-
2005
- 2005-04-04 CN CN200510059955A patent/CN1847971B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1362632A (en) * | 2000-12-28 | 2002-08-07 | Lg电子株式会社 | Image projector |
| CN1527128A (en) * | 2003-03-03 | 2004-09-08 | 明基电通股份有限公司 | Projecting display with invisible light reflecting plate for dispersing heat energy |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102645826A (en) * | 2011-11-10 | 2012-08-22 | 深圳市光峰光电技术有限公司 | Light source system, illuminating device and projecting device |
| CN102645826B (en) * | 2011-11-10 | 2015-05-27 | 深圳市光峰光电技术有限公司 | Light source system, illuminating device and projecting device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1847971A (en) | 2006-10-18 |
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