TW594368B - Transmissive LCD projector - Google Patents

Abstract

A transmissive LCD projector comprising a plurality of LED arrays, an X-prism, a project lens, a plurality of reflective mirrors, a plurality of panels is provided. The LED arrays provide a light with a first color, a second color and a third color respectively. The X-prism is disposed at the intersection of the light with the first color, the second color and the third color. The project lens is disposed at the light path after the X-prism. The reflective mirrors reflect the first, the second and the third color light respectively through the panels to the X-prism, and then form an image by the project lens.

Description

舛 368

The present invention relates to a liquid crystal display device using a transmissive liquid crystal projection device and a transmissive liquid crystal projection device, and in particular a LED array as a light source. Widely used in daily life and other direct-view applications: common LCD screens, notebook computers, digital LCD monitors, and non-direct-view display panels such as LCD projectors and rear projection televisions, such as Silicon Panel

^ ystai 0n Silicon (LC0s), high temperature polycrystalline silicon liquid crystal panel (UTPS-LCD), transmissive panel, etc. Since direct-view displays still have many limitations in large-size displays, LCD displays and rear-projection televisions with large-resolution display panels and optical engines have gradually become mainstream with high-resolution non-direct-view displays. trend. FIG. 1 is a schematic structural view of a conventional transmissive liquid crystal projection device. Referring to FIG. 1, the conventional transmissive liquid crystal projection device [00] is mainly composed of a light source 102, a lens array 104, a polarization conversion element 丨 〇6, a condenser lens 108, and a two-way beam splitting mirror no. 120, reflecting mirrors 112, 124, 126, collimating lenses 113, 121, 127, liquid crystal panels 114, 122, 128, polarized light

The components 114a, 122a, and 128a, the analysis plates 114b, 122b, and 128b, the X-edge lock 116, and the projection objective 1 1 8 are included. Please also refer to FIG. 1. In the conventional transmissive liquid crystal projection device 丨 0 〇, the light source 102 is usually an ultra-high pressure mercury bulb, and the light rays R, G, and B emitted by the light source 〇 02 will pass through the lens. Array 丨 04 to achieve uniformity

10364twf.ptd Page 6 594368 V. Description of Invention (2) Fruit. Then, the light rays R, G, and B will pass through a polarization converter (Ps converter) 106, and exit with the light rays Rs, Gs, and Bs of the S polarization type. Next, the light rays Rs, Gs, and Bs pass through a condenser lens 108 and are incident on a two-way beam splitter mirror (DM) 110. The two-way beam splitter mirror 1 1 0 allows the light beams Rs, Gs to pass through, and Reflect the light Bs. The following will sequentially describe the light paths of the light rays B s and the light rays G s and R s. The light Bs reflected by the two-way beam splitter mirror 110 will be incident on the reflection mirror 1 1 2, and the light Bs reflected by the reflection mirror 1 12 will pass through the collimator lens 1 13, the polarizer 1 14 a, The liquid crystal panel 114 and the analysis sheet 1 14b are incident on X- 稜鏡 116. Since the optical coating 116a in X- 稜鏡 116 has a wavelength-selective property, such as reflecting light in the blue light wavelength range and allowing light outside the blue light wavelength range to pass through, the optical coating 1 1 6 a will reflect the light Bs Into the projection objective 118. The light rays Gs and Rs passing through the two-way beam splitter mirror 110 are incident on the two-way beam splitter mirror 120. The two-way beam splitter mirror 120 allows the light beam Rs to pass through and reflects the light beam Gs. Among them, the light Gs reflected by the two-way beam splitter mirror 120 passes through the collimating lens 121, the polarizer 122a, the liquid crystal panel 122, and the analysis plate 122b in order and enters the X- 稜鏡 116. The above-mentioned analysis sheet 122b generally does not have a retardation effect, so the light Gs is still in the p-polarized state after passing through the analysis sheet 122b. In other words, the light Gp entering X_1616 is a P-polarized light, so the light Gp will directly penetrate the X-prism 1 1 6 and enter the projection objective 118. The light RS passing through the two-way beam splitter 120 will be incident on the reflecting mirror 124 and the reflecting mirror 126 in sequence, and the light reflected by the reflecting mirrors 124 and 126

10364twf.ptd Page 7 594368 5. Description of the invention (3) " The light Rs will pass through the collimator lens 28, polarizer i28a, liquid crystal panel 128, and resolution plate 128b, and then enter X- 稜鏡 116. Since the optical coating U6b in χ_ 稜鏡 116 has a characteristic of wavelength selection, the optical key film 1 1 6b can reflect light in the wavelength range of red light, so the optical coating ii6b in χ- 稜鏡 116 reflects the light Rs. To the projection objective ιΐ8. After the light rays Rs, Gp, and Bs are combined by the X-prism 1 1 6, the images of the various colors of light can be superimposed and the colored daylight surface can be projected by the projection objective 1 1. In the device, because the ultra-high pressure mercury lamp is used as the light source, its service life is limited (about 2000 hours) and the brightness decays rapidly. Therefore, the projection device must be replaced after a period of use. The package & The service life of a high-pressure mercury bulb usually uses a car t ί, a miscellaneous lighting procedure, so the warm-up time is longer. The operating temperature of this product is higher than that of the South Pressure Mercury Lamp. "The effect of influencing the invention of other optical components-the purpose of this award is to provide a light source of different colors (red, green, blue). Second, reduce the speed by two and two to reduce the life of the ultra-high-pressure mercury bulb, the brightness, the temperature of the hexahedron is too high, and the lighting process is complicated. Installation, its February: C is providing-a kind of transmissive liquid crystal projection installation color light is + ,, light, blue light emitting diode array directly provided: the original 'does not need to go through a beam splitter (such as two-way beam splitter and other components) 4. Description of the invention (4) The source of the present invention, the combined light element plate, the second and third liquid crystal plane polar arrays, and the structure of the first-rabbit light-polar body first-color light (two-color light (eg, two-color light and the third party, The projection object and the third-color light-emitting diode array crystal panel are on the light distribution path; the light-combining element reflects the two-color light of the second-reflecting mirror and the light-receiving element array and the first transmission type. A liquid crystal element, a projection lens, and a first plate. The second light-emitting two-light-emitting diode array is, for example, red light ^ is blue light.) The three-color light mirror is arranged on the light path and combines 7L light. The second color light mirror and the light combination are placed on the third path between the first anti-second reflecting surface; and the third example of a transmissive reflecting mirror projecting between the mirror and the first reflecting surface Mirror, plate] 苐 Three-reflection mirror source is a base And the third light-emitting light-emitting diode and a liquid crystal plane (in which, the photoelectrode array array, the first arrangement is in the seat), the second 'combined light element path intersects the light element; the first reflection mirror and the mirror arrangement The first first polarization between the light liquid crystal projections of the light-emitting diodes of the second liquid crystal color light between the light path elements is mainly a first liquid, and a first lens array and a lens are arranged. Among them, the side of the first polarization conversion element body is colored light (for example, the light path combining element with the color light of the first color emitting mirror system that is arranged after 4 ′, for example, is the second light emitting element; the second liquid is the second color light. The body array and the panel are arranged on the path. In the device, in the light path conversion element of the color light, for example, the second polar body array can be divided into green light, the first color is located on the seat light, and the second light is placed on the first path; The polar crystal array and the crystal panel are arranged on the light path by the light crystal plane, and the second light emitting array and the upper two-color light of the first light and the first body. The first light emitting diode core on the third reflecting surface between the first light elements is sequentially and firstly condensed and colored light is converted into

l〇364twf.ptd Page 9 594368 V. Description of the invention (5) The first polarization type (for example, S polarization). In the transmissive liquid crystal projection device of this embodiment, a first collimating lens and a first polarizer are sequentially arranged on the light path of the first colored light between the first reflecting mirror and the first liquid crystal panel; A first analysis sheet is arranged between the first liquid crystal panel and the light combining element, for example.

In the transmissive liquid crystal projection device of this embodiment, a second lens array and a second polarization conversion element are sequentially arranged on the light path of the second color light between the second light emitting diode array and the second reflecting mirror, for example. , And a second condenser lens. The second polarization conversion element can convert, for example, the second color light into the first polarization type (for example, S polarization). In the transmissive liquid crystal projection device of this embodiment, for example, a second collimating lens and a second polarizer are sequentially arranged on the light path of the second color light between the second reflecting mirror and the first liquid crystal panel; and A second analysis sheet is arranged between the second liquid crystal panel and the light combining element, for example. The penetrating body array and the third reflection of this embodiment are provided with a third lens array lens. Among them, the third first polarization type (for example, the third color light @ column and the third polarization conversion element between the mirrors in the transmissive liquid crystal projection device, and the polarization conversion element may be, for example, S polarization). In the third light-emitting diode path, for example, in sequence, and the third spotlight converts the third color light into

In the transmissive liquid crystal projection device of this embodiment, the light of the third color between the third color panel and the third liquid crystal panel, the second reflecting mirror, the third collimating lens, and the third polarizer; For example, a third analysis piece is arranged between the pieces. One / night crystal panel and light-gathering element

The light combining element in the projection device is, for example,

10364twf.ptd Page 10 V. Description of the invention (6) X —Prism ’This X- 稜鏡 has an and — one, and the first optical mineral film and the i-th light = optical mineral film, the line is reflected to the projection objective lens for projection. … Set the transmissive liquid crystal projection of the light in the wavelength range of the special wavelength —- ;;; 1 and the f-th liquid crystal panel are transmissive 丄: array disk 2: hair: use :: light-emitting diode array歹 11. The second light-emitting diode color light source is the light source, which can directly provide the three originals to UUOO hours and more than 0 days. This design can extend the life of the light source 2 to make the above and other features, features, and advantages of the present invention more clear. The following is a detailed description of a preferred embodiment in conjunction with the attached drawings, which are described in detail below: Mode 1 and Figure 2 show a transmissive liquid crystal according to a preferred embodiment of the present invention. Schematic diagram of the structure of the device; Figure 3 shows a schematic diagram of the structure of a light source in 2 examples of transmissive liquid crystal projection devices according to a preferred embodiment of the present invention, and Figure 4 ~ is not shown according to a preferred embodiment of the present invention. Schematic diagram of the light path in a transmissive liquid crystal projection device. Please refer to FIG. 2 to FIG. 4 at the same time. The transmissive liquid crystal projection device 2 0 0 of this embodiment is mainly composed of a light source 3 0 0, a light combining element 4 0 0, a projection lens 5 0 0, and a first lens array 2 〇2, 204, the first polarization conversion element 206, the first focusing lens 208, the first reflecting mirror 212, 212, the first collimating lens 214, the first polarizer 216, and the first wave Crystal panel 218, first analysis sheet 2 2 0, second lens array 2 2 2, 2 2 4, second polarization conversion element

10364twf.ptd Page 11 594368 Description of the invention (7), the second small focal lens 228, the second reflecting mirror 23 0,232, the second collimating lens 234, the second polarizer 23 6, the second liquid crystal panel 238, The second analysis sheet 24j: the third lens arrays 242, 244, the third polarization conversion element 246, the third focusing lens 248, the third reflection surface mirror 25, 252, the third collimator lens 254, and the third polarizer 25 6 , A third liquid crystal panel 2 58, and a third analysis sheet 260. In this embodiment, the light source 300 is composed of, for example, a base body 302, a first light-emitting diode array 304, a second light-emitting diode array 306, and a third light-emitting diode array 308. The first light-emitting diode array 3 02, the second light-emitting diode array 304, and the third light-emitting diode array 3 08 are, for example, arranged on the sides of the base 3 2 to provide the first The colored light 1 ?, the second colored light G, and the third colored light B. The following will describe the light paths of the first color light R, the second color light G, and the third color light B, respectively. 1. The first color light r provided by the first light emitting diode array 302 will be incident on the first polarization conversion element 206θ through the first lens arrays 202 and 204. This first polarization conversion element 206 can convert the first The polarization type of the colored light r is converted into the first colored light RS of S polarization. Then the first color light Rs is incident on the first reflecting mirrors 210 and 212 through the first condenser lens 2008. After that, the first color light Rs reflected by the first reflecting mirrors 210 and 212 will sequentially pass through the first collimating lens 214, the first polarizer 216, the first liquid crystal panel 218 (transmissive panel), and the first The analysis sheet 220 is incident on the light combining element 400. The second color light b provided by the second light-emitting diode array 304 is incident on the second polarization conversion element 226 through the second lens arrays 222 and 224. The second polarization conversion element 2 2 6 can convert the second color light The polarization type of B is converted to

594368 V. Description of the invention (8) S-polarized second-color light Bs. Then, the second color light Bs is incident on the second reflecting mirrors 230, 232 through the second condenser lens 228. After that, the second color light Bs reflected by the second reflecting mirrors 230 and 232 will sequentially pass through the second collimating lens 234, the second polarizer 23 6, the second liquid crystal panel 238 (transmissive panel), and the second The analysis sheet 240 is incident on the light combining element 400.

The third color light g provided by the third light emitting diode array 342 will be incident on the second polarization conversion element 2 4 6 through the first lens array 2 4 2 ′ 2 4 4. The third polarization conversion element 246 may The polarization type of the third color light G is converted to the third color light (} 5 of the S polarization. Then the third color light is incident on the third reflecting mirrors 2 50 and 252 through the third condenser lens 2 48. After that, The third-color light Gs reflected by the three reflecting mirrors 250 and 252 passes through the third collimating lens 254, the third polarizer 256, the third liquid crystal panel 258 (transmissive panel), and the third analysis sheet 260 in order and enters. To the light-combining element 400. In the projection optical system of this embodiment, the third analysis sheet 260 does not have a retardation effect of polarized light, so the light emitted from the third analysis sheet 260 is P The third color light Gp of the polarization type. In other words, the second color light Gp entering the light combining element is a light of the p polarization type, so the third color light Gp directly penetrates the light combining element 400 and is incident on the projection objective lens 500.

In this embodiment, the light-combining element 400 is, for example, X- 稜鏡, and the light-combining element 400 must be arranged at the parent set of light paths of the first color light R, the second color light β, and the third color. As can be seen from FIG. 2, the light combining element 400 is located above the base body 3 02 #, for example. In addition, the projection objective lens 500 is arranged in the first color light Rs and the second color light after the light combining element. The light with the third color light Gp achieves the purpose of projection.

594368 V. Description of the invention (9) In the above embodiment, the ",-, and L ^ younger brother, three light emitting diode array can be directly provided; primary color light (R, G, B) to achieve the display Features. In the present invention, the light paths of the colored lights in the examples are just examples, and are not used to limit the red and green fish. You must first support the children, and the lonely shoulders follow the diagram shown in the figure. The path. The transmissive liquid crystal projection device of the present invention has at least the following advantages: The transparent transmissive liquid crystal projection device uses light-emitting diodes = rows as a light source, which can improve the short life of the light source of the ultra-high pressure mercury lamp and reduce the brightness quickly. , High operating temperature, and complicated lighting procedures. ~ The two penetrating liquid crystal projection devices of the present invention use the first light-emitting diode array and the third light-emitting diode array as if two light sources for the three primary color light sources to the corresponding liquid crystal panel. Increase the life of the light source to more than 10,000 hours. 3. The power dissipation of the transmissive liquid crystal projection device of the present invention is low, except that Si = reaches "and: can be replaced by plastic components instead of glass, and although the present invention has been used to define the present invention, any of the above is true, but it is not The scope of protection shall be regarded as the appended two; the dagger is more; and the ㈣, so the protection defined by the patent of the invention shall prevail.

594368 Brief Description of Drawings Figure 1 shows the structure of a conventional transmissive liquid crystal projection device; Figure 2 shows the structure of a transmissive liquid crystal projection device according to a preferred embodiment of the present invention; Figure 3 FIG. 4 is a schematic structural diagram of a light source in a transmissive liquid crystal projection apparatus according to a preferred embodiment of the present invention; and FIG. 4 is a schematic diagram of an optical path in a transmissive liquid crystal projection apparatus according to a preferred embodiment of the present invention. Description of the graphical symbols 1 0 0: the conventional transmissive liquid crystal projection device 1 0 2: the light source 1 0 4: the lens array 1 0 6: the polarization conversion element 1 0 8: the condenser lens 1 1 0, 1 2 0: bidirectional Beamsplitters 112, 124, 126: Reflective mirrors 113, 121, 127: Collimating lenses 114, 122, 128LCD panel 1 14a, 122a, 128a: Polarizer 1 14b, 122b, 128b: Analysis sheet 1 1 6 : X- 稜鏡 116a, 116b: Optical coating 1 1 8: Projection objective

10364twf.ptd Page 15 594368 Brief description of the drawing 2 0 0: The transmissive liquid crystal projection device of this embodiment 2 2, 2 0 4: the first lens array 2 0 6: the first polarization conversion element 2 0 8: First focusing lenses 210, 212: first reflecting mirror 214, first collimating lens 216, first polarizer 218, first --- liquid crystal panel 220, first analysis plate 2 2 2, 2 2 4: second lens array 2 2 6: second polarization conversion element 2 2 8: second focusing lens 230, 232: second reflecting mirror 234: second collimating lens 2 3 6: second polarizer 238, second liquid crystal panel 240: second analysis Sheets 242, 244. Third lens array 246. Third polarization conversion element 248: Third focusing lens 250, 252: Third reflecting mirror.

254 Third collimator lens 256 Third polarizer 258 Second LCD panel 10364twf.ptd Page 16 594368

10364twf.ptd Page 17

Claims (1)

594368 _ Case No. 92102152_ Year Month Revision _ 6. Application for patent scope to convert the first color light into the first polarization type. 3. The transmissive liquid crystal projection device according to item 2 of the scope of patent application, further comprising a first lens array, the first color disposed between the first light emitting diode array and the first polarization conversion element. Light on the light path. 4. The transmissive liquid crystal projection device according to item 2 of the scope of patent application, further comprising a first condenser lens disposed between the first polarization conversion element and the first reflecting mirrors. Light on the light path. 5. The transmissive liquid crystal projection device and apparatus described in item 2 of the scope of patent application, further comprising a first collimating lens disposed between the first reflecting mirrors and the first liquid crystal panel. One color light on the light path. 6. The transmissive liquid crystal projection device as described in item 5 of the scope of patent application, further comprising a first polarizer disposed between the first collimating lens and the first liquid crystal panel. Light path. 7. The transmissive liquid crystal projection device as described in item 5 of the scope of patent application, further comprising a first resolution film disposed on the light path of the first colored light between the first liquid crystal panel and the light combining element. . 8. The transmissive liquid crystal projection device described in item 1 of the scope of patent application, further comprising a second polarization conversion element disposed between the second light emitting diode array and the second reflecting mirrors. On the light path of the dichroic light, the second-color light is converted into a first polarization state. 9. The transmissive liquid crystal projection device as described in item 8 of the scope of patent application, further comprising a second lens array disposed between the second light emitting diode array and the second polarization conversion element. On the light path of dichroic light. 10. Transmissive liquid crystal projection device as described in item 8 of the scope of patent application 10364twf1.ptc, page 19, 594368 _ case number 92102152_ year, month and year__ Sixth, the scope of the patent application, including a second condenser lens, is arranged in the second polarization conversion element and the second reflecting mirror Between the light paths of the second color light. 1 1. The transmissive liquid crystal projection device as described in item 1 of the scope of patent application, further comprising a second collimating lens disposed between the second reflecting mirrors and the second liquid crystal panel. Light path. 12. The transmissive liquid crystal projection device as described in item 11 of the scope of patent application, further comprising a second polarizer disposed between the second collimating lens and the second liquid crystal panel. Light path. 1 3. The transmissive liquid crystal projection device as described in item 11 of the scope of patent application, further comprising a second analysis sheet disposed in the light path of the second color light between the second liquid crystal panel and the light combining element. on. 1 4. The transmissive liquid crystal projection device as described in item 1 of the scope of patent application, further comprising a third polarization conversion element disposed between the third light emitting diode array and the third reflecting mirrors. The third color light is on a light path to convert the third color light into a first polarization type. 15. The transmissive liquid crystal projection device according to item 14 of the scope of patent application, further comprising a third lens array disposed between the third light-emitting diode array and the third polarization conversion element. Tricolor light on the light path. 16. The transmissive liquid crystal projection device according to item 14 of the scope of patent application, further comprising a third condenser lens disposed between the third polarization conversion element and the third reflecting mirrors. Tricolor light on the light path. 1 7. The transmissive liquid crystal projection device as described in item 1 of the scope of patent application, further comprising a third collimating lens disposed between the third reflecting mirrors and the third liquid crystal panel. Light path. 10364twf1.ptc Page 20 594368 _ Case No. 92102152_ Year Month Amendment _ 6. Patent application scope 1 8. The transmissive liquid crystal projection device described in item 17 of the patent application scope, including a third polarizer Is disposed on the light path of the third color light between the third collimating lens and the third liquid crystal panel. 19. The transmissive liquid crystal projection device as described in item 17 of the scope of patent application, further comprising a third analysis sheet disposed in the light path of the third colored light between the third liquid crystal panel and the light combining element. on. 20. The transmissive liquid crystal projection device as described in item 1 of the scope of patent application, wherein the light combining element is an X-ray. 2 1. The transmissive liquid crystal projection device as described in item 1 of the scope of patent application, further comprising a body located below the light combining element, and the first light emitting diode array and the second light emitting diode The body array and the third light-emitting diode array jp array are arranged on the side surface of the base. 2 2. The transmissive liquid crystal projection device as described in item 1 of the scope of patent application, wherein the first liquid crystal panel, the second liquid crystal panel, and the third liquid crystal panel are transmissive liquid crystal panels. 2 3. The transmissive liquid crystal projection device according to item 1 of the scope of patent application, wherein the first color light is red, the second color light is green, and the third color light is blue. 10364twf1.ptc Page 21