WO2002019725A1 - Dispositif d'affichage en couleurs a cristaux liquides - Google Patents
Dispositif d'affichage en couleurs a cristaux liquides Download PDFInfo
- Publication number
- WO2002019725A1 WO2002019725A1 PCT/FR2001/002596 FR0102596W WO0219725A1 WO 2002019725 A1 WO2002019725 A1 WO 2002019725A1 FR 0102596 W FR0102596 W FR 0102596W WO 0219725 A1 WO0219725 A1 WO 0219725A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- display device
- liquid crystal
- light
- elementary
- assigned
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
- G02B27/1086—Beam splitting or combining systems operating by diffraction only
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
- G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
- G02B27/102—Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources
- G02B27/1046—Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources for use with transmissive spatial light modulators
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
- G02B27/14—Beam splitting or combining systems operating by reflection only
- G02B27/141—Beam splitting or combining systems operating by reflection only using dichroic mirrors
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
- H04N9/3105—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying all colours simultaneously, e.g. by using two or more electronic spatial light modulators
Definitions
- the invention relates to a liquid crystal color display device of the type which includes:
- liquid crystal matrix equipped with optical means for focusing, on liquid crystals assigned respectively to each of the fundamental colors, the corresponding complementary light beams, electronic means being provided for acting on the liquid crystals and modulating the light emitted by these, according to the desired intensities,
- Color display devices of this type are known, commonly called “spatiochromatic projectors", in which the white light emitted by the source is formed in a parallel beam directed on three dichroic mirrors having different inclinations relative to the mean direction. of the white light beam.
- the three dichroic mirrors make it possible to produce three complementary beams of light corresponding to the fundamental colors B, G and R. These three beams have slightly different directions of incidence on the liquid crystal matrix so that the focusing of each elementary beam takes place at different points where there are liquid crystals assigned to the fundamental colors. It is recalled that the liquid crystals are not self-luminous and that they must be lit to constitute luminous points.
- a liquid crystal color display device which makes it possible to improve the resolution of the image projected on the screen and the rendering of colors, without however complicating manufacture.
- a liquid crystal color display device of the type defined above, is characterized in that it comprises:
- - optical separation means for forming, from the polychromatic light source, at least two elementary sources having ranges of different wavelengths which however contain a mixture of the fundamental colors B, V, R, these elementary sources being geometrically spread,
- liquid crystal matrices assigned to each channel are identical, with the same number of pixels, so that the resolution on channel V (green) is twice the resolution for the other two.
- fundamental colors B and R which share the pixels of the other matrix.
- An optical division means is provided on the output of the two light guides to produce two optical channels, one assigned to the only green color V, the other to the blue colors B and red R.
- the division means can be constituted by a dichroic filter with reflection of B and R and with transmission of V, or conversely by a dichroic filter with transmission of B and R and with reflection of V.
- the two optical channels are arranged at 90 ° as are the two arrays assigned to each of these channels.
- the dichroic filter is inclined at 45 ° on the optical axis.
- the merger of the two channels is then performed using a dichroic recombination mirror or a semi-transparent mirror inclined at 45 °.
- the outputs of the two light guides correspond to the two complementary sources and are spaced a few millimeters apart, these sources making it possible to illuminate the liquid crystal matrices from two distinct angles so that the beams are focused on two neighboring pixels; in the case of the green way the two neighboring pixels are illuminated by two beams of green light while in the case of the red and blue way, the two neighboring pixels are assigned respectively to red and to blue.
- a Fresnel lens is placed between the optical division means and the liquid crystal matrices.
- a simple mirror is provided between the Fresnel lens and the liquid crystal matrices to fold the beam preferably at 90 °.
- the invention consists, apart from the arrangements set out above, of a certain number of other arrangements which will be more explicitly discussed below in connection with an example described with reference to the attached drawings, but which n 'is in no way limiting.
- Figure 1 of these drawings is an overall diagram of a liquid crystal color display device according to the invention.
- Figure 2 is an enlarged diagram of part of the liquid crystal matrix with microlenses, for green.
- FIG 3 finally, similarly shows in Figure 2 the liquid crystal matrix with microlenses for blue and red.
- a liquid crystal display device A we can see a liquid crystal display device A.
- This device comprises a white light source 1, formed for example by an electric arc, equipped with an ellipsoidal reflector 2.
- the light from the source 1 is a mixture of the three fundamental colors: blue B, green V and red R.
- Optical separation means S are provided to form, at from the white light source 1, two elementary sources 1a, 1b having different wavelength ranges.
- the two elementary sources 1a, 1b are separated geometrically.
- the optical separation means S comprise a network 3, for example of 220 t / mm (lines / millimeter), which deflects the light differently according to the wavelength.
- a network 3 for example of 220 t / mm (lines / millimeter), which deflects the light differently according to the wavelength.
- a plane P distant from the grating there is spreading of light in a direction orthogonal to the direction of propagation.
- three zones B, V and R have been represented.
- the separation of the wavelengths is not brutal but progressive, in particular in the case of a continuous spectrum.
- a prism 4 is advantageously provided, disposed between the network 3 and the source 1, which allows good correction and the maintenance of the optical axis in the axis of the lamp 1.
- Two light guides 5a, 5b joined together are arranged on either side of the optical axis of the lamp 1, with one face on this axis.
- Each guide 5a, 5b can be formed by a trunk of a pyramid made of glass or transparent plastic, with parallel bases perpendicular to the direction of the optical axis; the small base faces the network 3.
- the entry faces of the guides 5a, 5b are located in the plane P.
- the guide 5a located above according to the representation in FIG.
- each guide 5a, 5b is equipped at the outlet with a condenser 6a, 6b forming the elementary source 1a, 1b.
- the centers of the two sources 1a, 1b are spaced perpendicular to the optical axis of the lamp 1.
- the light emitted by each elementary source 1a, 1b contains a mixture of the fundamental colors.
- An F1 gradient dichroic filter is placed after the guides
- the mean direction of the light rays coming from sources 1a, 1b in the vicinity of one end of the filter F1 forms an angle ⁇ 1 with this filter while towards the other end, the angle of the mean direction of the rays with the filter F1 is equal to ⁇ 2.
- the filter F1 is designed so that the cut-off frequency, in the wavelengths, is the same or substantially the same for the two angles ⁇ 1 and ⁇ 2.
- the F1 gradient dichroic filter is provided, for example, to ensure the transmission of green V, and the reflection of blue B and red R.
- the diagram in Fig.1 corresponds to such a dichroic filter F1.
- the gradient dichroic filter could be provided with reflection for V and with transmission for B and R.
- the filter F1 gives rise to two optical channels Cv and Crb each comprising a liquid crystal matrix Mv, Mrb.
- the channel Cv, with its matrix Mv is assigned to the only fundamental color V, while the other channel Crb with its matrix Mrb is assigned to the other two fundamental colors R and B.
- the channel Cv comprises, following the filter F1, a Fresnel lens L, for example of plastic material, perpendicular to the optical axis of the source 1 and giving a parallel beam of light.
- a Fresnel lens L for example of plastic material
- a simple mirror 7 inclined at 45 ° on the optical axis, for a deflection at 90 °.
- the liquid crystal matrix Mv is arranged following the mirror 7, at right angles to the lens L.
- the matrix Mv comprises liquid crystals or elementary pixels 8a, 8b, 9a, 9b ... transmissive elements arranged in the same plane perpendicular to the mean direction of light. Lines of pixels parallel and similar to that shown in Fig.2 follow one another in a direction perpendicular to the plane of Fig.2.
- the pixels are associated in pairs 8a, 8b ... each pixel of a pair corresponding to one of the elementary sources 1a, 1b.
- An image of the source 1a; 1b is formed on the corresponding pixels 8a, 9a; 8b, 9b ...
- the liquid crystal matrix (LCD matrix) is equipped with a transparent blade 10 made of plastic or glass, on one face of which microlenses 11 are formed, made up of convex cylindrical surfaces with generatrices perpendicular to the plane of FIG. 2.
- the same microlens 11 receives, from two different angles, two parallel beams coming from sources 1a, 1b. The difference in the angles of incidence comes from the geometric spacing of the sources 1a, 1b.
- Each beam of different inclination will be focused on a respective pixel.
- the matrix Mv two pixels of a pair 8a, 8b will be lit in green V (with however slight differences in the average wavelengths), which is indicated in FIG. 2 by the letter V assigned to each pixel.
- the matrix Mrb is preferably identical to the matrix Mv, with the same number of pixels.
- the parallel beam of blue light B comes from 1a and its inclination is different from that of the beam of red light R which comes from 1b.
- the focusing of the blue light beam B occurs for example on the pixels 8a, 9a, ... affected by the letter B while the focusing of the red light beam R occurs on the pixels 8b, 9b, ... affected of the letter R.
- the number of B points and R points will be half the number of V points.
- Electronic means E are provided for controlling each elementary pixel 8a, 8b, 9a, 9b ... as a function of the desired light intensity for this pixel in response to the illumination provided by the microlenses 10.
- the two complementary sources 1a, 1b spaced a few millimeters apart, formed by the outputs of the light guides 5a, 5b make it possible to illuminate the liquid crystals from two distinct angles so that the energy coming from a source 1a is focused on a pixel 8a and the energy coming from the other source 1b is focused on the neighboring pixel 8b, this diagram repeating every two pixels on the same line.
- a filter with polarizer 12 is placed to reduce stray light.
- the mirror 14 can be aligned with the filter F1.
- the mirror 14 can also advantageously be a dichroic recombination mirror.
- a wide angle lens 15 for example of F / D ratio substantially 1.6 which projects onto a screen 16 the elementary points of the image obtained by fusion of the modulated pixels V, B and R .
- the screen 16 can be translucent, for observation of the image on the side opposite to the objective 15.
- the dichroic filter F1 lets through the component V of the beams coming from sources 1a and 1b. These beams reach the liquid crystal matrix Mv from two slightly different angles. Each beam is focused on an associated liquid crystal. Each liquid crystal or pixel 8a, 8b, ... of the matrix Mv thus lit, emits or transmits a green light whose intensity is modulated by the command supplied by the electrical means E relative to the pixel considered.
- the B component of the beam from source 1a is reflected by the dichroic filter F1. It is the same for the R component of the beam from the source 1b.
- the two beams B and R are directed onto the liquid crystal matrix Mrb at slightly different angles.
- the beam B will be focused, for example, on the liquid crystals 8a, 9a ... of the matrix Mrb, while the beam R will be focused, for example, on the liquid crystals 8b, 9b ... of the matrix Mrb.
- the elementary pixels B and R will have a light intensity which will depend on the instructions provided by the electronic means E.
- each colored point of the image projected on the screen 16 results from the fusion of two pixels V, for example 8a, 8b of the matrix Mv and a pixel B and a pixel R, for example respectively 8a, 8b of the matrix Mrb.
- the two matrices Mv and Mrb are identical and constituted for example by LCD XGA matrices (1024 x 768), that is to say 1024 pixels in the horizontal direction and 768 pixels in the vertical direction.
- the system uses two guides 5a, 5b which perform spectral separation and integration.
- the separation is carried out by physically limiting the entry of the two guides such that one transmits the lower part of the visible spectrum from 550 nm to 420 nm and the other the upper part from 680 nm to 550 nm.
- the guides 5a, 5b integrate the spectra concerned, the output of the guides carrying out the angular separation intended for spatio-chromatism.
- Two objectives, or condensers, 6a, 6b are used at the output of the guides to form the image of this output in the plane of the LCDs.
- a projector with two transmissive LCDs Mv, Mrb, one of which is intended for green V and the other for blue B and red R the separation is done by a mirror or filter F1 at 45 ° and the recombination likewise by a mirror 14, the two mirrors being in alignment the one from the other, and the LCDs at 45 ° to these mirrors and 90 ° to each other.
- a projection objective 15 of sufficient opening is provided to admit the extent of the beam generated by the lighting system.
- the projection device makes it possible to improve the overall resolution compared to a projector in which the three fundamental colors B, G and R are decomposed according to a single line of pixels of a single matrix.
- color rendering is better because green, to which the eye is most sensitive, benefits from a higher efficiency coefficient.
- the aperture of the projection objective 15 is smaller, this objective is therefore cheaper and easier to achieve.
- the spectral separation is improved and pollution of one channel by another is avoided in the case where mirrors are used.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Liquid Crystal (AREA)
- Projection Apparatus (AREA)
- Video Image Reproduction Devices For Color Tv Systems (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2001284134A AU2001284134A1 (en) | 2000-09-01 | 2001-08-10 | Liquid crystal colour display device |
US10/362,619 US20030179322A1 (en) | 2000-09-01 | 2001-08-10 | Liquid crystal colour display device |
JP2002523883A JP2004507796A (ja) | 2000-09-01 | 2001-08-10 | 液晶カラーディスプレイデバイス |
EP01963091A EP1314323A1 (fr) | 2000-09-01 | 2001-08-10 | Dispositif d'affichage en couleurs a cristaux liquides |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0011184A FR2813675B1 (fr) | 2000-09-01 | 2000-09-01 | Dispositif d'affichage en couleurs a cristaux liquides |
FR00/11184 | 2000-09-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002019725A1 true WO2002019725A1 (fr) | 2002-03-07 |
Family
ID=8853896
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2001/002596 WO2002019725A1 (fr) | 2000-09-01 | 2001-08-10 | Dispositif d'affichage en couleurs a cristaux liquides |
Country Status (7)
Country | Link |
---|---|
US (1) | US20030179322A1 (fr) |
EP (1) | EP1314323A1 (fr) |
JP (1) | JP2004507796A (fr) |
CN (1) | CN1212021C (fr) |
AU (1) | AU2001284134A1 (fr) |
FR (1) | FR2813675B1 (fr) |
WO (1) | WO2002019725A1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7404644B2 (en) | 2004-05-12 | 2008-07-29 | Sharp Kabushiki Kaisha | Time-sequential colour projection |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7198373B2 (en) * | 2005-05-03 | 2007-04-03 | Eastman Kodak Company | Display apparatus using LCD panel |
US20060250581A1 (en) * | 2005-05-03 | 2006-11-09 | Eastman Kodak Company | Display apparatus using LCD panel |
US20090009726A1 (en) * | 2007-07-03 | 2009-01-08 | United Microdisplay Optronics Corp. | Multi-primary-color digital light splitting and combining system and method, and digital projector |
FR2969282B1 (fr) * | 2010-12-21 | 2014-07-18 | Horiba Jobin Yvon Sas | Dispositif et procede de visualisation et de mesure de diffusion raman |
CN103885184B (zh) * | 2014-04-10 | 2016-04-27 | 北京理工大学 | 一种投影式平面波导头盔显示器 |
KR102439106B1 (ko) * | 2017-09-05 | 2022-09-05 | 현대자동차주식회사 | 차량의 리어 램프 장치 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH08160375A (ja) * | 1994-12-05 | 1996-06-21 | Sharp Corp | カラー液晶表示装置 |
JP2000131647A (ja) * | 1998-10-28 | 2000-05-12 | Seiko Epson Corp | 照明装置およびそれを用いた投写型表示装置 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH10301077A (ja) * | 1997-04-28 | 1998-11-13 | Fujitsu Ltd | 液晶表示装置 |
US6513934B1 (en) * | 1999-02-17 | 2003-02-04 | Canon Kabushiki Kaisha | Projection apparatus and observation apparatus |
US6191893B1 (en) * | 1999-06-04 | 2001-02-20 | Philips Electronics North America Corporation | Color projection display system with improved hue variation |
-
2000
- 2000-09-01 FR FR0011184A patent/FR2813675B1/fr not_active Expired - Fee Related
-
2001
- 2001-08-10 AU AU2001284134A patent/AU2001284134A1/en not_active Abandoned
- 2001-08-10 JP JP2002523883A patent/JP2004507796A/ja not_active Withdrawn
- 2001-08-10 US US10/362,619 patent/US20030179322A1/en not_active Abandoned
- 2001-08-10 WO PCT/FR2001/002596 patent/WO2002019725A1/fr not_active Application Discontinuation
- 2001-08-10 CN CNB01815025XA patent/CN1212021C/zh not_active Expired - Fee Related
- 2001-08-10 EP EP01963091A patent/EP1314323A1/fr not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH08160375A (ja) * | 1994-12-05 | 1996-06-21 | Sharp Corp | カラー液晶表示装置 |
JP2000131647A (ja) * | 1998-10-28 | 2000-05-12 | Seiko Epson Corp | 照明装置およびそれを用いた投写型表示装置 |
Non-Patent Citations (2)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 1996, no. 10 31 October 1996 (1996-10-31) * |
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 08 6 October 2000 (2000-10-06) * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7404644B2 (en) | 2004-05-12 | 2008-07-29 | Sharp Kabushiki Kaisha | Time-sequential colour projection |
Also Published As
Publication number | Publication date |
---|---|
US20030179322A1 (en) | 2003-09-25 |
JP2004507796A (ja) | 2004-03-11 |
CN1212021C (zh) | 2005-07-20 |
EP1314323A1 (fr) | 2003-05-28 |
AU2001284134A1 (en) | 2002-03-13 |
CN1451240A (zh) | 2003-10-22 |
FR2813675A1 (fr) | 2002-03-08 |
FR2813675B1 (fr) | 2002-11-01 |
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