TWI341955B - Transmissive liquid crystal panel and projector using the same - Google Patents

Description

B41955 Correction and replacement page on February 22, 2014. Description of the Invention: [Technical Field] [0001] The present invention relates to the field of projection, and more particularly to a transmissive liquid crystal panel and projection of color on a screen using the transmissive liquid crystal panel Image projector 先前 [Prior Art] [0002] Conventional projectors are mainly of both transmissive and reflective. The basic principle of the transmissive projector is to separate the light emitted by the light source into three colors of red, green and blue by means of a dichroic mirror, and the three colors of light are respectively incident on the corresponding three transmissive liquid crystal panels (Transmissive Liquid Crystal Panel). And by the rotation of the liquid crystal molecules applied to the transmissive liquid crystal panel, a color image is formed on the screen. [0003] For a transmissive LCD projector, a transmissive liquid crystal panel includes a liquid crystal molecular layer that can transmit light and a thin film transistor (TFT) that controls the rotation of liquid crystal molecules. Since the thin film transistor is a semiconductor device, it is typically made of an amorphous material which is sensitive to photo-electric effects. In order to avoid light, the line is straight, the film is irradiated, and the color contrast value of R, G, and B is increased. It is necessary to construct a black matrix corresponding to the pixel in the liquid crystal display element on the incident surface of the liquid crystal display element (Black Matrix). ). However, this will cause some of the light beams to be blocked by the black matrix, resulting in a lower aperture ratio (Aperture Ratio). The aperture ratio is the ratio of the area of the actual permeable area to the total area of the unit's element in the unit pixel. The higher the aperture ratio, the higher the transmittance of light. In order to increase the aperture ratio of the panel, the prior art further adds a microlens array (MLA, Micro Lens Array) in front of the black matrix. 096137495 Form No. A0101 Page 4 / Total 19 Page 1003059844-0 1341955 -- .. Correction of Replacement Pages on February 22, 100 The microlens array has a converging effect on the incident light, so that the light that would otherwise be blocked by the black matrix can pass through. The liquid crystal molecular layer of light, thereby increasing the aperture ratio of the panel. [0005] However, due to the convergence of the microlens array, the image light emitted from the transmissive liquid crystal panel is incident on the projection lens (Projection Lens), which introduces a large angle of incident light, causing a large aberration, thereby causing a projection image. The resolution is reduced. SUMMARY OF THE INVENTION [0006] In view of the above, it is necessary to provide a transmissive liquid crystal panel having an adjustable angle of light. [0007] Secondly, it is also necessary to provide a projector that has a better resolution of the projected picture. A transmissive liquid crystal panel comprising a microlens array and a liquid crystal display element. The microlens array is located on one side of the incident surface of the liquid crystal display element, and the microlens array includes a plurality of microlenses. The exit surface side of the transmissive liquid crystal panel has an adjustable lens array and a lens adjustment unit, and the adjustable lens array includes a plurality of adjustable lenses, and the microlens in the microlens array and the pixels in the liquid crystal display element— Correspondingly, the adjustable lens in the tunable lens array corresponds to the microlens in the microlens array, and the lens adjusting unit is used to adjust the focal length of the adjustable lens. [0009] A projector comprising a light source, a transmissive liquid crystal panel, and a projection lens, and the transmissive liquid crystal panel includes a microlens array and a liquid crystal display element. The light beam emitted by the light source is condensed by the microlens array and then passed through the liquid crystal display element. The liquid crystal display element modulates the incident light beam according to the video signal, and 096137495 Form No. A0101 Page 5 / 19 pages 1003059844-0 t341955 Correction replacement page on February 22, 100 [0013] [0013] The 096137495 shadow lens projects light emitted from the liquid crystal display element onto the screen. The projector further includes an adjustable lens array and a lens adjustment unit, the adjustable lens array is located on one side of the exit surface of the liquid crystal display element, and the microlens in the microlens array corresponds to a pixel in the liquid crystal display element, The adjustable lens in the lens array corresponds to the microlens in the microlens array, and the lens adjustment unit is used to adjust the focal length of the adjustable lens to change the divergence angle of the light incident on the projection lens. In the above transmissive liquid crystal panel, the focal length of the adjustable lens can be changed by the lens adjusting unit to adjust the angle of the outgoing light of the transmissive liquid crystal panel. In the above projector, the lens adjustment unit is used to change the focal length of the adjustable lens, thereby changing the incident lens to the projection lens to project the shoulder on the screen. [Embodiment] FIG. 1 is a partial schematic structural view of a transmissive liquid crystal panel 310 according to a preferred embodiment. The transmissive liquid crystal panel 31 0 includes a microlens array 12, a liquid crystal display element 16, and is adjustable. Lens, array 13' lens adjustment unit 15. The microlens array 12 is located on the side of the incident surface of the liquid crystal display element 16, and the microlens array 12 includes a plurality of microlenses 120 corresponding to the pixels in the liquid crystal display element 16. The tunable lens array 13 is located on the exit surface side of the liquid crystal display element 16, and the tunable lens array 13 includes a plurality of tunable lenses 130, which are in one-to-one correspondence with the microlenses 120 in the microlens array 12. In the present embodiment, the tunable lens array 13 is a liquid lens array. The lens adjustment unit 15 and the liquid lens array 13 are electrically connected. Due to the convergence of the microlens array 12, the light is emitted in the liquid crystal display element form number A0101 page 6 / 19 pages 1003059844-0 1341955 • I on February 22, 100, after the replacement of the page 16 will be outwardly diverged, forming Larger angle. The focal length of the liquid lens 130 can be adjusted by the magnitude of the potential output by the lens adjusting unit 15, so that the outgoing beam whose original angle is too large is focused to form a small angle 02 (02 < 0 1 ), so that the transmissive liquid crystal panel 31 can be adjusted. The exiting light angle 〇 [0014] FIG. 2 is a schematic diagram of an optical system of the projector 100 in the first preferred embodiment, the projector 100 includes an illumination optical system 10, a color separation optical system 20, a light modulation system 30, and Following the optical system (Relay Op- • tical System) 40 and the projection lens 24. The illumination optical system 10 includes a light source 11, lens arrays 104, 108, a mirror 106, and a polarization converter 105. The color separation optical system 20 includes dichroic mirrors 202, 204. The light modulation system 30 includes transmissive liquid crystal panels 35R, 35G, 35B and a light combining prism 308. The relay optical system 40 includes mirrors 404, 206, 408, a retardation lens 402, and a relay lens 406. Among them, the transmissive liquid crystal panels 35R, 35G, and 35B used in the projector 100 include microlens arrays 302R, 302G, and 302B, liquid crystal display elements 300R' to 300G, 300B, and tunable lens arrays 304R, 304G, and 304B, respectively. [0015] The light source 11 can be a high pressure halogen lamp or a high pressure mercury lamp comprising a filament 11 2 and a reflector cover 114. The reflector cover 114 can be parabolic in shape for converting the light emitted by the filament 112 into approximately parallel rays having an approximately circular face along the beam propagation path. [0016] The lens arrays 104 and 108 have a plurality of microlenses and have substantially the same size as the rectangular liquid crystal display elements of the transmissive liquid crystal panels 35R, 35G, 35B. The lens arrays 104 and 108 cause the above-described light beam of a circular cross section emerging from the light source 11 to be emitted substantially uniformly. 096137495 Form No. A0101 Page 7 of 19 1003059844-0 1341955 [0017] On February 22, 100, the polarization converter 105 was used to change the polarization of the light emitted from the lens arrays 1〇4 and 1〇8. The state is such that the outgoing light has only one polarization state, for example, 5 light is converted into P light, so that the light emitted by the polarization converter is p light. [0018] The dichroic mirrors 202 and 204 separate the light beams emitted from the polarization converter 1〇5 into three colors of red (R), green (G), and blue (B), while the dichroic mirror 2〇2 reflects red light to On the mirror 206, the mirror 2〇β further reflects the red light onto the transmissive liquid crystal panel 35R that modulates the red light, and the dichroic mirror 204 reflects the green light onto the transmissive liquid crystal panel 35G that modulates the green light. The blue light passes through the retardation lens 402 to the mirror 404. The mirror 404 reflects the blue light to the relay.

On the lens 406, the mirror 408 further reflects the blue light that passes through the relay lens 406 to the transmission I 402 of the modulated basket color and the role of the relay lens 406.

The length of the optical path of the retardation lens I is equal to 'ensure that red, green and blue light are simultaneously incident on the transmissive liquid crystal panels 35R, 35G, 3 & B = red, green, blue - trichromatic light through the microlens arrays 302R, 302G, 302B The convergence can be increased by the liquid crystal display elements 300R, 300G, and 300B', respectively. The video signal source is A/D converted, modulated into an electric drive signal, and added to the transmissive liquid crystal panel.

35R, 35G, 35Β, by controlling the rotation of the liquid crystal molecules, controlling the R, G ' Β three-color light pass rate to form a three-color light carrying image information. The three-color light carrying the image information is in the light combining prism 308 After being synthesized, it is projected onto the screen 27 through the projection lens 24 to form a color image. [0019] The microlens arrays 302R, 302G, and 302 are respectively located on the light incident surface side of the liquid crystal display elements 300R, 300G, and 300, and the microlens arrays 302R, 302G, and 302 are respectively included in the plurality of microlenses 23R, 23G, and 23A. On the side of the exit surface of the liquid crystal display elements 300R, 300G, 300A, there are respectively 096137495 Form No. 1010101 Page 8/19 pages 1003059844-0 1341955 [0020]

096137495 February 22, 100 Nuclear replacement page adjustable lens array 3 0 4 R, 3 0 4 G, 3 0 4 B ^ Adjustable lens array 3 〇4 R , 3〇4G, 304B respectively include a plurality of adjustable lenses 25R, 25G, and 25B, the adjustable lenses 25R, 25G, and 25B are in one-to-one correspondence with the microlenses 23R, 23G, and 23B, respectively. By adjusting the focal length of the adjustable lenses 25R, 25G' 25B, the angle of the light emitted from the transmissive liquid crystal panels 35R, 35G, 35B can be changed, thereby changing the angle of the light incident on the projection lens 24, and improving the resolution of the projected image. . In the present embodiment, the tunable lens arrays 304R' 3 〇 4G, 3 〇 4B are liquid lens arrays. The projector 100 further includes three lens adjusting units 45 (only the lens adjusting unit 45 for adjusting the focal length of the liquid lens 304R is shown in Fig. 3) The other two lens adjusting units 45 adjust the focal lengths of the liquid lens arrays 3〇4G and 3〇4B, respectively. The three lens adjustment units 45 are electrically connected to the liquid lens arrays 304R, 304G, and 304B, respectively. Referring to FIG. 3 together, taking the liquid lens array 3〇4R as an example, the exit surface of the liquid crystal display element 300R is provided with a plurality of liquid lenses 25 [^ liquid lens 25R corresponding to the microlens 23R in the microlens array 302R, Located on the exit surface side of the liquid crystal display element 300R. The aperture value (F/# value) of the projection lens 24 = Effective Focal Length (EFFL) / the diameter of the pupil (Pupil) indicates the angle. Changing the angle of incidence of light incident on the projection lens 24 is equivalent to changing the aperture value of the projection lens 24. Thus, by the focal length adjustment mechanism, for example, the magnitude of the potential output by the lens adjustment unit 45 changes the focal length of the liquid lens 25R, that is, it is equivalent to adjusting the aperture value of the projection lens 24, thereby changing the angle at which the person hits the projection lens 24's light. The resolution of each pixel of the picture can be improved. Please refer to FIG. 4 again, taking the liquid lens array 3_ as an example, assuming that the microlens array form number is Α0101, the 9th spirit/total 19 pages 1003059844-0 [0022] 1341955, the 22nd of February, the shuttle is replacing the page column 302 R The focal length of the image of the microlens 23R is F, and the focal length of the liquid lens 25R in the liquid array 304R is F2'. The parallel incident beam is concentrated by the microlens 23R and the liquid lens 25R, and then incident on the projection lens at an angle of 5 > 24 on. [0023] When the projector 10 detects that the surface of the screen is poorly analyzed, the focal length of the liquid lens 25R is changed by adjusting the magnitude of the potential output by the lens adjusting unit 45, and the glare incident on the projection lens 24 is reduced. The angle of the liquid lens increases as the voltage decreases. Assuming that the potential of the output of the lens adjustment unit 45 is reduced, the focal length of the liquid lens 25R is F2~, φ at this time F2...>β because the focal length of the lens is longer. The weaker the convergence characteristic of the light, the light is emitted to be incident on the projection lens 24, thereby improving the projection field. [0024] The projector 100 changes the focal length of the lens lens 25R by adjusting the magnitude of the potential of the lens adjustment unit 4, and changes the incident angle of the light incident on the projection lens 24, thereby projecting through the projection lens 24. The image on the screen 27 has a better resolution. [0025] Those skilled in the art will recognize that the above embodiments are merely illustrative of the invention and are not intended to limit the invention as long as Within the scope of the spirit of the invention> The adaptations and changes made to the above embodiments fall within the scope of the requirements of the transition (4). One of them, only for the projector 1 - a transmissive liquid crystal panel Set the liquid lens array 'for example' only corresponds to the transmissive liquid crystal panel 35R to set the liquid 096137495 Form No. A0101 Page 10 / Total 9 pages 1003059844-0 [0026] 1341955 100 February 2011 lens array 304R, or only corresponding to the transmissive liquid crystal panel 35G sets the liquid lens array 304G, or the transmissive liquid crystal panel 35B sets the liquid lens array 304B' to respectively change the red or green light or The angle of light incident on the projection lens 24 by the blue light improves the resolution of the projected image. [0027] Secondly, only two liquid crystal panels of the projector 1 are disposed correspondingly to the liquid lens array, for example, only corresponding to the transmissive liquid crystal panels 35R and 35G. The liquid lens arrays 304R and 304G are additionally provided to change The red light and the green light are incident on the projection lens 24 at a light angle, or only the transmissive liquid crystal surface plates 35G and 35B are respectively provided with liquid lens arrays 304G and 304B to change the angle of the light incident on the projection lens 24 by the green light and the blue light. Alternatively, the liquid lens arrays 304R and 304B are provided only for the transmissive liquid crystal panels 35R and 35B to change the angle of the light incident on the projection lens 24 by the red and blue light, thereby improving the resolution of the projected picture. [0028] Second, the liquid crystal lens arrays are respectively disposed on the three transmissive liquid crystal panels of the projector 1 , that is, the liquid crystal arrays 304R′ 304B and 304G are respectively disposed corresponding to the transmissive liquid crystal panels 35R, 35G, and 35B, respectively. The angle of the light incident on the projection lens 24 by the red, green, and blue light is changed, thereby improving the resolution of the projected image. [0029] The liquid lens arrays 304R, 304B, and 304G of the projector 100 may be separated from the transmissive liquid crystal panels 35R, 35B, and 35G. That is, the liquid panel 35R, 35B '35G includes microlens arrays 302R, 302B, 302G, liquid crystal display

The elements 300R, 300B, 300G are separated from the liquid lens arrays 304R, 304B, 304G. In addition, the liquid lens array can also be other forms of tunable lens arrays, such as a focus adjustable liquid crystal lens array, the liquid crystal lens array including a plurality of liquid crystal lenses, which can be made by applying a voltage to the liquid crystal molecules 096137495 Form No. A0101 19 pages 1003059844-0 1341955

Corrected replacement W on February 22, 100

[0034] [0034] [0034] [0037] [0038] [0040] [0044] [0044] [0044] [0044] moving changes the liquid crystal lens focal length. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial schematic view showing a structure of a transmissive liquid crystal panel in a preferred embodiment. FIG. 2 is a schematic view showing an optical system of a projector in a preferred embodiment. Figure 3 is a schematic illustration of a microlens array and a liquid lens array in the projector of Figure 2. Fig. 4 is a view showing the positional relationship between the liquid lens and the microlens in the microlens array in the liquid lens array shown in Fig. 2. [Description of main component symbols] Microlens arrays 12, 302R, 3〇^| Microlenses 120, 23R, 23G, 23Β

Liquid crystal display elements 300R, 300G, 300B Liquid lens arrays 13, 304R, 304G, 3〇 lb, liquid lens 130, 25R, 25G, 25B Projection lens 24 Light source 11 Mirrors 106, 404, 206 ' 408 Transmissive liquid crystal panels 310, 35R, 35G, 35B polarization converter 105 light combining prism 3 0 8

096137495 Form No. A0101 Page 12 of 19 1003059844-0 1341955 Correction Replacement Page [0245] February 22 [0045] Delay Lens 4 0 2 [0046] Relay Lens 406 [0047] Dichroic Mirrors 202, 204 [0048] ] Filament 11 2 [0049] Reflector 1 4 [0050] Projector 100 [0051] Screen 27

Lens arrays 104, 108 [0053] Illumination optical system 10 [0054] Color separation system 30 [0055] Light modulation system 30 [0056] Relay optical system 40 [0058] Liquid crystal display element 16 [0058] Lens Adjustment unit 15, 45 096137495 Form number A0101 Page 13 / Total 19 pages 1003059844-0

Claims (1)

1341955 Correction and replacement page on February 22, 100. Patent application scope: 1. A transmissive liquid crystal panel comprising a microlens array and a liquid crystal display element, the microlens array being located on the side of the incident surface of the liquid crystal display element, the microlens The array includes a plurality of microlenses, the improvement comprising: an adjustable lens array and a lens adjustment unit on an exit surface side of the liquid crystal display element, the tunable lens array comprising a plurality of tunable lenses, and the microlens in the microlens array A pixel in the liquid crystal display element - correspondingly, the tunable lens in the tunable lens array corresponds to a microlens in the microlens array, the lens adjustment unit is used to adjust the focal length of the tunable lens. 2. The transmissive liquid crystal panel of claim 1, wherein the The panel and the tilting lens array are liquid lens arrays, and the projector comprises a @£ _ shadow lens, the transmissive liquid crystal panel comprises a micro lens array and a liquid crystal display element, and the light beam emitted by the light source passes through the microlens array Shame_ after passing through the liquid crystal display element, the liquid crystal display element modulates the incident light beam according to the video signal, and the projection lens projects the light of the liquid from the liquid crystal display element onto the screen, and the improvement is that the projector further includes an adjustable lens array : Column and lens adjustment unit The tunable lens array is located on an exit surface side of the liquid crystal display element, and the microlens in the microlens array corresponds to a pixel in the liquid crystal display element, and the tunable lens and the micro ray in the tunable lens array Microlens in the lens array - correspondingly, the lens adjustment unit is used to adjust the focal length of the tunable lens array to change the divergence angle of the light incident on the projection lens. The projector of claim 3, wherein the tunable lens array is a liquid lens array. The projector of claim 4, wherein the lens adjustment sheet 096137495 Form No. A0101 Page 14/19 pages 1003059844-0 1341955 The correction of the hidden page element can output a variable voltage, Used to adjust the focal length of the liquid lenses. 6. The projector of claim 4, wherein the transmissive liquid crystal panel comprises a red light transmissive liquid crystal panel, a green light transmissive liquid crystal panel, a blue light transmissive liquid crystal panel, the red light transmissive liquid crystal panel, At least one of the green light transmissive liquid crystal panel and the blue light transmissive liquid crystal panel has a liquid lens array. 096137495 Form No. A0101 Page 15 of 19 1003059844-0