WO2008018647A1 - Projection-type liquid crystal display - Google Patents
Projection-type liquid crystal display Download PDFInfo
- Publication number
- WO2008018647A1 WO2008018647A1 PCT/KR2006/003172 KR2006003172W WO2008018647A1 WO 2008018647 A1 WO2008018647 A1 WO 2008018647A1 KR 2006003172 W KR2006003172 W KR 2006003172W WO 2008018647 A1 WO2008018647 A1 WO 2008018647A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- liquid crystal
- light
- projection
- crystal display
- short wavelength
- Prior art date
Links
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 65
- 230000001678 irradiating effect Effects 0.000 claims abstract description 4
- 230000001939 inductive effect Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000005520 cutting process Methods 0.000 description 3
- 238000004904 shortening Methods 0.000 description 3
- 238000002834 transmittance Methods 0.000 description 3
- 229910004261 CaF 2 Inorganic materials 0.000 description 2
- -1 ITO Inorganic materials 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000011368 organic material Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 229910016036 BaF 2 Inorganic materials 0.000 description 1
- 229910004446 Ta2 O5 Inorganic materials 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 229910001632 barium fluoride Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- CJNBYAVZURUTKZ-UHFFFAOYSA-N hafnium(IV) oxide Inorganic materials O=[Hf]=O CJNBYAVZURUTKZ-UHFFFAOYSA-N 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 229910001507 metal halide Inorganic materials 0.000 description 1
- 150000005309 metal halides Chemical class 0.000 description 1
- 229910052950 sphalerite Inorganic materials 0.000 description 1
- 229910052984 zinc sulfide Inorganic materials 0.000 description 1
Classifications
-
- 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
- H04N9/3111—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying the colours sequentially, e.g. by using sequentially activated light sources
- H04N9/3114—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying the colours sequentially, e.g. by using sequentially activated light sources by using a sequential colour filter producing one colour at a time
Definitions
- the present invention relates to a projection-type liquid crystal display, and more particularly, to a high-luminance color wheel comprising an RGB filter and a short wavelength cut filter applicable to a projection-type liquid crystal display (LCD).
- a high-luminance color wheel comprising an RGB filter and a short wavelength cut filter applicable to a projection-type liquid crystal display (LCD).
- LCD liquid crystal display
- a LCD projector refers to a device that employs a liquid crystal panel as an optical switching element so as to project an image formed onto the liquid crystal panel onto a screen in a magnified scale using a focus lens.
- Liquid crystal panels are roughly classified into a transmission type and a reflection type.
- Such LCD projectors can be largely categorized into a single-panel type and a three-panel type.
- a three-panel type LCD projector is designed to allow red (R), green (G) and blue (B) colors to be transmitted through three liquid crystal panels through a plurality of dichroic mirrors and to be synthesized to form a single color image thereby. Since a three-panel type LCD projector employs three liquid crystal panels, the price of the panels and the related optical system increases, leading to the increase in the price of the entire projector.
- a color wheel i.e., a disc-like rotary color filter, which is a red (R), green (G) and blue (B) color separation region formed on a single disc in place of said color filter so as to allow light irradiated from a light source to be separated into red (R), green (G) and blue (B) light beams to be projected in turn.
- a color wheel i.e., a disc-like rotary color filter, which is a red (R), green (G) and blue (B) color separation region formed on a single disc in place of said color filter so as to allow light irradiated from a light source to be separated into red (R), green (G) and blue (B) light beams to be projected in turn.
- a primary color wheel may be configured to include a white filter, a yellow filter, a magenta filter, a cyan filter, etc., or any one of the yellow filter, the magenta filter, the cyan filter, etc.
- the liquid crystal panel is damaged and shortened in lifespan due to the white filter which is still included in the color wheel.
- the color of the additionally applied filter appears biasedly on an actually implemented screen.
- the present invention has been made in an effort to solve the above- mentioned problems occurring in the prior art, and it is an object of the present invention to provide a projection-type liquid crystal display which adopts a short wavelength cut filter capable of cutting off a short wavelength.
- Another object of the present invention is to provide a projection-type liquid crystal display which can implement high-luminance and prevent a color bias.
- Yet another object of the present invention is to provide a projection-type liquid crystal display which eliminates the need of an additional color calibrator.
- a projection-type liquid crystal display comprising: a light source for irradiating white light; a color wheel including a RGB filter and a short wavelength cut filter for excluding respectively RGB light and light of short wavelength from said light source; and a liquid crystal panel for displaying an image using the light which has passed through said color wheel.
- the short wavelength cut filter according to the present invention serves to cut off a part of an ultra-violet ray and a visible ray, and the cutoff range may differ depending upon the color temperature of a projector.
- Such a short wavelength cut filter cuts off a part of or the whole of a light having a wavelength of less than 480nm, and occupies Ie ss than 40% of the entire area of the color wheel.
- the short wavelength cut filter according to the present invention is constructed by repeatedly stacking layers with at least two or more selected from the group of Al O , CeF 3 , Na3 AlF6 , HfO2 , ITO, CaF 2 , MgF 2 , MgO, SiO 2 , Ta2 O5 , TiO2 , ZrO2 , BaF2 , ZnS and
- the projection-type liquid crystal display of the present invention has an advantageous effect in that it can have a high-luminance as well as prevent a damage to the liquid crystal panel and a color bias by allowing the color wheel thereof to comprise a primary color (R, G, B) filter and a short wavelength cut filter.
- the present invention has a merit in that the color wheel of the projection-type liquid crystal display can be formed with only a short wavelength cut filter, thereby facilitating miniaturization of the liquid crystal display, and that the procedure of forming the filter short wavelength cut filter is simple enough to reduce the manufacturing cost of the liquid crystal display.
- FIG. 1 is a view illustrating a color wheel of a conventional projection-type liquid crystal display according to the prior art
- FIG. 2 is a schematic view illustrating the structure of a projection-type liquid crystal display according to the present invention.
- FIG. 3 is a graph illustrating a transmittance by each wavelength of an RGB filter and a short wavelength cut filter of a color wheel of a projection-type liquid crystal display according to the present invention.
- FIG. 2 is a schematic view illustrating the structure of a projection-type liquid crystal display according to the present invention.
- the projection-type liquid crystal display includes a light source 13, a color wheel 6, a liquid crystal panel 2, and a focus lens 3.
- the light source 13 is for irradiating white light
- the color wheel 6 includes an RGB filter and a short wavelength cut filter, wherein the RGB filter is for excluding red, green and blue light, and the short wavelength cut filter for excluding light of short wavelength from said light source
- a liquid crystal panel 2 is for displaying an image using the light which has passed through said color wheel
- a focus lens 3 is for enlarging an image formed by the light transmitted through the liquid crystal panel to be projected onto a screen.
- the projection-type liquid crystal display may further include at least one relay lens for inducing the light transmitted through the color wheel to the liquid crystal panel.
- the light source according to the present invention employs a white light source such as a metal halide lamp, a high-pressure mercury lamp or the like, and the color wheel according to the present invention is formed with an RGB filter and a short wavelength cut filter as shown in FIG. 3.
- FIG. 3 is a graph illustrating an example of a transmittance by each wavelength of an RGB filter and a short wavelength cut filter of a color wheel of a projection-type liquid crystal display according to the present invention.
- the short wavelength cut filter cuts off light of a short wavelength.
- the short wavelength cut filter cuts off a light of short wavelength of less than 460 nm, but it is preferable to substantially cut off light having a short wavelength of less than 480nm.
- the light having a short wavelength of less than 480nm actually does not influence brightness, i.e., luminance of the liquid crystal panel, but due to its high-level energy contributes to inducing decomposition of organic materials constituting the liquid crystal panel to form impurities and increasing the temperature of the liquid crystal panel to shorten the lifespan of the liquid crystal display.
- the present invention allows to be applied to the color wheel the short wavelength cut filter capable of partially or wholly cutting off light having a wavelength of less than 480nm, so that a damage of the panel, i.e., a shortening of the lifespan of the panel can be prevented while increasing luminance of the liquid crystal panel.
- the cutting off light of only a short wavelength among white light that does not have a great effect on the luminance the decreasing of luminance is small, and a wavelength cutoff range of the short wavelength can be adjusted to correct color temperature, thereby eliminating the need of an additional color calibrator.
- an applicable short wavelength cut filter preferably occupies 40% or less of the entire area of the color wheel.
- the short wavelength cut filter can be constructed by repeatedly stacking layers with at least two or more selected from the group of Al O , CeF , Na AlF , HfO , ITO, CaF 2 , Mg to F 2 , Mg to O, SiO 2 , Ta 2 O 5 , TiO 2 , ZrO 2 , BaF 2 , ZnS and PbF 2.
- the short wavelength cut filter is formed by repeatedly stacking MgF , ZrO and CeF into several tens of layers.
- the stacking process is carried out by an E-beam or a chemical vapor deposition (CVD).
- the present invention has an advantageous effect in that a projection-type liquid crystal display with a high-luminance can be easily obtained which is capable of preventing a damage to the liquid crystal panel and a color bias, as well as facilitating its miniaturization to reduce its manufacturing cost.
Landscapes
- Liquid Crystal (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
Abstract
Disclosed herein is a projection-type liquid crystal display comprising: a light source for irradiating white light; a color wheel including an RGB filter and a short wavelength cut filter, the RGB filter being for excluding RGB light and the short wavelength cut filter for excluding light of a short wavelength from said light source; and a liquid crystal panel for displaying an image using the light which has passed through said color wheel. Therefore, the present invention has an advantageous effect in that a projection-type liquid crystal display with a high-luminance can be easily obtained which is capable of preventing damage to the liquid crystal panel and a color bias, as well as facilitating its miniaturization to reduce its manufacturing cost.
Description
Description PROJECTION-TYPE LIQUID CRYSTAL DISPLAY
Technical Field
[1] The present invention relates to a projection-type liquid crystal display, and more particularly, to a high-luminance color wheel comprising an RGB filter and a short wavelength cut filter applicable to a projection-type liquid crystal display (LCD).
[2]
Background Art
[3] In general, liquid crystal display (LCD) projectors of various types have been known to implement a complete color using a liquid crystal panel.
[4] A LCD projector refers to a device that employs a liquid crystal panel as an optical switching element so as to project an image formed onto the liquid crystal panel onto a screen in a magnified scale using a focus lens. Liquid crystal panels are roughly classified into a transmission type and a reflection type.
[5] Such LCD projectors can be largely categorized into a single-panel type and a three-panel type. A three-panel type LCD projector is designed to allow red (R), green (G) and blue (B) colors to be transmitted through three liquid crystal panels through a plurality of dichroic mirrors and to be synthesized to form a single color image thereby. Since a three-panel type LCD projector employs three liquid crystal panels, the price of the panels and the related optical system increases, leading to the increase in the price of the entire projector. In case of a single panel type LCD projector, there is known a time division type which allows a single liquid crystal panel to sequentially transmit red (R), green (G) and blue (B) colors over time therethrough to implement a color, and a pixel-by-pixel color filter type.
[6] Applied to a single panel type LCD projector is the time division type which employs a color wheel, i.e., a disc-like rotary color filter, which is a red (R), green (G) and blue (B) color separation region formed on a single disc in place of said color filter so as to allow light irradiated from a light source to be separated into red (R), green (G) and blue (B) light beams to be projected in turn.
[7] Conventionally, there has been caused a problem in that since a single color wheel is used to separate the light irradiated from a light source for illumination, the maximum efficiency of a lamp as the light source is merely a third of the efficiency in the case where the color wheel is not employed.
[8] Currently, in order to solve such a problem, as shown in FIG. 1, a red (R), green (G) and blue (B) color separation region and a white filter or a clear filter are applied to the conventional color wheel to induce an effect of increasing the maximum efficiency of
the lamp, i.e., luminance.
[9] However, in case where the white filter or the clear filter is applied to the color wheel of the projection-type liquid crystal display, a short wavelength ranging from 380nm to 480nm that has been transmitted through the white filter or the clear filter is absorbed into an alignment film or a polarized light film made of organic materials for the liquid crystal display to form a radical to induce reaction, which causes a problem of producing impurities, thereby leading a damage to the liquid crystal panel and shortening the lifespan of the liquid crystal panel.
[10] In addition, in case where the white filter or the clear filter is applied to the color wheel of the projection-type liquid crystal display, transmittance of a blue-color to liquid crystals increases to cause a phenomenon in which a color coordinate is biased wholly toward a blue color. Thus, a separate color calibration is indispensably required to implement a natural color.
[11] Meanwhile, for the sake of such color calibration, a primary color wheel may be configured to include a white filter, a yellow filter, a magenta filter, a cyan filter, etc., or any one of the yellow filter, the magenta filter, the cyan filter, etc. In case of the former, the liquid crystal panel is damaged and shortened in lifespan due to the white filter which is still included in the color wheel. In case of the latter, there occurs a shortcoming in that since only a monochromatic filter is additionally applied to the primary color wheel, the color of the additionally applied filter appears biasedly on an actually implemented screen.
[12] In other words, the above-mentioned conventional prior arts entail demerits in that they cause damage to the liquid crystal panel of the projection-type liquid crystal display, thereby shortening the lifespan of the liquid crystal panel, leading a color bias, and demanding an additional color calibration. Also, the color calibration is difficult, and hence cannot be actually applied to the projection-type liquid crystal display.
[13]
Disclosure of Invention Technical Problem
[14] Accordingly, the present invention has been made in an effort to solve the above- mentioned problems occurring in the prior art, and it is an object of the present invention to provide a projection-type liquid crystal display which adopts a short wavelength cut filter capable of cutting off a short wavelength.
[15] Another object of the present invention is to provide a projection-type liquid crystal display which can implement high-luminance and prevent a color bias.
[16] Yet another object of the present invention is to provide a projection-type liquid crystal display which eliminates the need of an additional color calibrator.
[17]
Technical Solution
[18] To accomplish the above object, according to one aspect of the present invention, there is provided a projection-type liquid crystal display comprising: a light source for irradiating white light; a color wheel including a RGB filter and a short wavelength cut filter for excluding respectively RGB light and light of short wavelength from said light source; and a liquid crystal panel for displaying an image using the light which has passed through said color wheel.
[19] The short wavelength cut filter according to the present invention serves to cut off a part of an ultra-violet ray and a visible ray, and the cutoff range may differ depending upon the color temperature of a projector. Such a short wavelength cut filter cuts off a part of or the whole of a light having a wavelength of less than 480nm, and occupies Ie ss than 40% of the entire area of the color wheel.
[20] The short wavelength cut filter according to the present invention is constructed by repeatedly stacking layers with at least two or more selected from the group of Al O , CeF 3 , Na3 AlF6 , HfO2 , ITO, CaF 2 , MgF 2 , MgO, SiO 2 , Ta2 O5 , TiO2 , ZrO2 , BaF2 , ZnS and
PbF .
2
[21] The terminologies or words used herein and the appended claims should not be limitedly construed as a lexiconical meaning, but should be construed only as a meaning and a concept complying with the technical spirit of the present invention on a basis of a principle in which an inventor can properly define the concept of the terminologies or words for the sake of explanation of his or her own invention in a best mode.
[22] Therefore, it is to be understood that since practical exemplary embodiment described herein and the construction illustrated in the accompanying drawings are merely a most preferred embodiment, but does not all cover the technical spirit of the present invention, various equivalents an modifications capable of replacing them can exist at the point of time of application of the present invention.
[23]
Advantageous Effects
[24] The projection-type liquid crystal display of the present invention has an advantageous effect in that it can have a high-luminance as well as prevent a damage to the liquid crystal panel and a color bias by allowing the color wheel thereof to comprise a primary color (R, G, B) filter and a short wavelength cut filter.
[25] In addition, the present invention has a merit in that the color wheel of the projection-type liquid crystal display can be formed with only a short wavelength cut filter, thereby facilitating miniaturization of the liquid crystal display, and that the
procedure of forming the filter short wavelength cut filter is simple enough to reduce the manufacturing cost of the liquid crystal display. [26]
Brief Description of the Drawings
[27] FIG. 1 is a view illustrating a color wheel of a conventional projection-type liquid crystal display according to the prior art;
[28] FIG. 2 is a schematic view illustrating the structure of a projection-type liquid crystal display according to the present invention; and
[29] FIG. 3 is a graph illustrating a transmittance by each wavelength of an RGB filter and a short wavelength cut filter of a color wheel of a projection-type liquid crystal display according to the present invention.
[30]
[31] < Description on main reference numerals >
[32] 2: liquid crystal panel 3: focus lens
[33] 6: color wheel 13: light source
[34]
Mode for the Invention
[35] Reference will now be made in detail to a preferred embodiment of the present invention with reference to the attached drawings.
[36] FIG. 2 is a schematic view illustrating the structure of a projection-type liquid crystal display according to the present invention. The projection-type liquid crystal display includes a light source 13, a color wheel 6, a liquid crystal panel 2, and a focus lens 3. To be more specific, the light source 13 is for irradiating white light; the color wheel 6 includes an RGB filter and a short wavelength cut filter, wherein the RGB filter is for excluding red, green and blue light, and the short wavelength cut filter for excluding light of short wavelength from said light source; a liquid crystal panel 2 is for displaying an image using the light which has passed through said color wheel; and a focus lens 3 is for enlarging an image formed by the light transmitted through the liquid crystal panel to be projected onto a screen. The projection-type liquid crystal display may further include at least one relay lens for inducing the light transmitted through the color wheel to the liquid crystal panel.
[37] In this case, the light source according to the present invention employs a white light source such as a metal halide lamp, a high-pressure mercury lamp or the like, and the color wheel according to the present invention is formed with an RGB filter and a short wavelength cut filter as shown in FIG. 3.
[38] FIG. 3 is a graph illustrating an example of a transmittance by each wavelength of an RGB filter and a short wavelength cut filter of a color wheel of a projection-type
liquid crystal display according to the present invention. As shown in FIG. 3, the short wavelength cut filter cuts off light of a short wavelength. In one embodiment of the present invention, the short wavelength cut filter cuts off a light of short wavelength of less than 460 nm, but it is preferable to substantially cut off light having a short wavelength of less than 480nm.
[39] The light having a short wavelength of less than 480nm actually does not influence brightness, i.e., luminance of the liquid crystal panel, but due to its high-level energy contributes to inducing decomposition of organic materials constituting the liquid crystal panel to form impurities and increasing the temperature of the liquid crystal panel to shorten the lifespan of the liquid crystal display. Thus, the present invention allows to be applied to the color wheel the short wavelength cut filter capable of partially or wholly cutting off light having a wavelength of less than 480nm, so that a damage of the panel, i.e., a shortening of the lifespan of the panel can be prevented while increasing luminance of the liquid crystal panel. Further, by the cutting off light of only a short wavelength among white light that does not have a great effect on the luminance, the decreasing of luminance is small, and a wavelength cutoff range of the short wavelength can be adjusted to correct color temperature, thereby eliminating the need of an additional color calibrator.
[40] In such a case, an applicable short wavelength cut filter preferably occupies 40% or less of the entire area of the color wheel.
[41] The short wavelength cut filter can be constructed by repeatedly stacking layers with at least two or more selected from the group of Al O , CeF , Na AlF , HfO , ITO, CaF 2 , Mg toF 2 , Mg toO, SiO 2 , Ta 2 O 5 , TiO 2 , ZrO 2 , BaF 2 , ZnS and PbF 2.
[42] In one embodiment of the present invention, the short wavelength cut filter is formed by repeatedly stacking MgF , ZrO and CeF into several tens of layers. In this case, the stacking process is carried out by an E-beam or a chemical vapor deposition (CVD).
[43] The terminologies or words used herein and the appended claims should not be limitedly construed as a lexiconical meaning, but should be construed only as a meaning and a concept complying with the technical spirit of the present invention on a basis of a principle in which an inventor can properly define the concept of the terminologies or words for the sake of explanation of his or her own invention in a best mode.
[44] Therefore, it is to be understood that since practical exemplary embodiment described herein and the construction illustrated in the accompanying drawings are merely a most preferred embodiment, but does not all cover the technical spirit of the present invention, various equivalents an modifications capable of replacing them can exist at the point of time of application of the present invention.
[45]
Industrial Applicability
[46] The present invention has an advantageous effect in that a projection-type liquid crystal display with a high-luminance can be easily obtained which is capable of preventing a damage to the liquid crystal panel and a color bias, as well as facilitating its miniaturization to reduce its manufacturing cost.
[47]
[48]
Claims
[1] A projection-type liquid crystal display comprising: a light source for irradiating white light; a color wheel including an RGB filter and a short wavelength cut filter, the RGB filter being for excluding RGB light and the short wavelength cut filter for excluding light of a short wavelength from said light source; and a liquid crystal panel for displaying an image using the light which has passed through said color wheel.
[2] The projection-type liquid crystal display according to claim 1, wherein the short wavelength cut filter excludes a part of or the whole of light having a wavelength of less than 480nm.
[3] The projection-type liquid crystal display according to claim 2, wherein the short wavelength cut filter occupies less than 40% of the entire area of the color wheel.
[4] The projection-type liquid crystal display according to claim 3, wherein the short wavelength cut filter is constructed by repeatedly stacking layers with at least two or more selected from the group of Al O , CeF , Na AlF , HfO , ITO, CaF , MgF , MgO, SiO , Ta O , TiO , ZrO , BaF , ZnS and PbF .
[5] The projection-type liquid crystal display according to claim 1 further comprising a focus lens for enlarging an image formed by the light transmitted through the liquid crystal panel to be projected onto a screen.
[6] The projection-type liquid crystal display according to claim 1 further comprising at least one relay lens for inducing the light transmitted through the color wheel to the liquid crystal panel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/KR2006/003172 WO2008018647A1 (en) | 2006-08-11 | 2006-08-11 | Projection-type liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/KR2006/003172 WO2008018647A1 (en) | 2006-08-11 | 2006-08-11 | Projection-type liquid crystal display |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2008018647A1 true WO2008018647A1 (en) | 2008-02-14 |
Family
ID=39033157
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/KR2006/003172 WO2008018647A1 (en) | 2006-08-11 | 2006-08-11 | Projection-type liquid crystal display |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2008018647A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111413843A (en) * | 2018-12-19 | 2020-07-14 | 卡西欧计算机株式会社 | Light source device and projection device |
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| US20030128000A1 (en) * | 2002-01-10 | 2003-07-10 | Nec Viewtechnology, Ltd. | Display system |
| US20030142241A1 (en) * | 2002-01-31 | 2003-07-31 | Allen William J. | Display device with cooperative color filters |
| US20040095767A1 (en) * | 2000-05-25 | 2004-05-20 | Hideki Ohmae | Color wheel assembly and color sequential display device using the same |
| US20040114114A1 (en) * | 2001-02-27 | 2004-06-17 | Kunihiko Yano | Multi-layer film cut filter and production method therefor, uv cut filter, dustproof glass, display panel and projection type display unit |
| KR20050008025A (en) * | 2003-07-14 | 2005-01-21 | 주식회사 하이소닉 | Color Wheel, and System including the Color Wheel for Displaying Color Image |
| KR20050009397A (en) * | 2003-07-16 | 2005-01-25 | 엘지전자 주식회사 | Single panel projection device |
| US20060126031A1 (en) * | 2004-11-20 | 2006-06-15 | Samsung Electronics Co., Ltd. | Illumination optical system of projection apparatus |
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2006
- 2006-08-11 WO PCT/KR2006/003172 patent/WO2008018647A1/en active Application Filing
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|---|---|---|---|---|
| US20040095767A1 (en) * | 2000-05-25 | 2004-05-20 | Hideki Ohmae | Color wheel assembly and color sequential display device using the same |
| US20040114114A1 (en) * | 2001-02-27 | 2004-06-17 | Kunihiko Yano | Multi-layer film cut filter and production method therefor, uv cut filter, dustproof glass, display panel and projection type display unit |
| US20030128000A1 (en) * | 2002-01-10 | 2003-07-10 | Nec Viewtechnology, Ltd. | Display system |
| US20030142241A1 (en) * | 2002-01-31 | 2003-07-31 | Allen William J. | Display device with cooperative color filters |
| KR20050008025A (en) * | 2003-07-14 | 2005-01-21 | 주식회사 하이소닉 | Color Wheel, and System including the Color Wheel for Displaying Color Image |
| KR20050009397A (en) * | 2003-07-16 | 2005-01-25 | 엘지전자 주식회사 | Single panel projection device |
| US20060126031A1 (en) * | 2004-11-20 | 2006-06-15 | Samsung Electronics Co., Ltd. | Illumination optical system of projection apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111413843A (en) * | 2018-12-19 | 2020-07-14 | 卡西欧计算机株式会社 | Light source device and projection device |
| CN111413843B (en) * | 2018-12-19 | 2022-03-29 | 卡西欧计算机株式会社 | Light source device and projection device |
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