JP4364526B2 - Manufacturing method of color correction filter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of manufacturing a color correction filter.
[0002]
[Prior art and problems to be solved by the invention]
There has been proposed a projector device that emits image light from a liquid crystal projector, projects the image light on a screen, and views the image projected on the screen.
[0003]
This projector apparatus is mainly classified into two types, a transmission type and a reflection type, and a transmission type is generally used.
[0004]
In the transmissive type, light passes through a liquid crystal plate to be image light, and an image obtained by projecting the image light onto a screen is viewed. In the case of the transmissive type, the problem is how to brighten the image because attenuation of luminance when light passes through the liquid crystal plate becomes a problem.
[0005]
On the other hand, in the reflection type, light is reflected by a liquid crystal plate to be image light, and an image obtained by projecting this image light on a screen is viewed. In the case of this reflection type, brightness attenuation does not occur unlike the transmission type, and a bright image can be obtained.
[0006]
As described above, the reflective type has an advantage that a brighter image can be obtained than the transmissive type, but instead, it is required to have high performance in terms of color tone and resolution in addition to the brightness.
[0007]
In this reflection type, with respect to the color tone, high performance can be achieved by interposing a filter in the passage path of the image light. For example, due to the nature of light, the longer the wavelength, the more difficult it is to transmit through the lens from which the image light is transmitted. Therefore, among the R, G, and B (red, green, blue) constituting the image light, the short wavelength G If a filter through which B and B are difficult to transmit is interposed in the passage path, R, G, and B are balanced, and the color tone is improved.
[0008]
However, when the filter is interposed in this way, the reason has been unknown until now, but there has been a problem that the resolution is lowered.
[0009]
As a result of earnest research, the present invention is based on a completely new point of view that it is important to eliminate the waviness of the filter in order to suppress the decrease in resolution. This completes a method for manufacturing a color correction filter excellent in practicality that allows viewing of images with high resolution.
[0010]
[Means for Solving the Problems]
The gist of the present invention will be described with reference to the accompanying drawings.
[0011]
Provided in front of the lens 35 of the reflective liquid crystal projector 5, the incident light 10 is split into R, G, and B, and each spectrum is reflected by the liquid crystal plate and then subjected to a predetermined optical correction, thereby correcting the spectrum. Each of the correction spectra is condensed into the corrected image light 12, which is a manufacturing method of the color correction filter 1 through which the corrected image light 12 is transmitted, and is formed by laminating a plurality of film-like retardation plates. An optical polishing process is performed on the upper and lower surfaces of the laminated retardation plate 2 so that the undulation of the laminated retardation plate 2 disappears, and then the laminated retardation plate 2 is sandwiched between the laminated retardation plates 2. The color tone correction filter 1 is manufactured by laminating a glass plate 3 on the upper surface and the lower surface of 2 with an adhesive layer 4 interposed therebetween . This relates to a method for manufacturing a color tone correction filter .
[0012]
The method for manufacturing a color correction filter according to claim 1, wherein an antireflection coating layer is provided on the surface of the glass plate 3 .
[0013]
The method for manufacturing a color correction filter according to any one of claims 1 and 2, wherein the refractive index of the laminated phase difference plate 2 is 1.585. It is concerned.
[0014]
The method for manufacturing a color correction filter according to claim 3, wherein the refractive index of the glass plate 3 is 1.52 .
[0015]
The method for manufacturing a color correction filter according to claim 4, wherein the adhesive layer 4 has a refractive index of 1.46 .
[0016]
[Action and effect of the invention]
The present invention summarizes the effects obtained as a result of repeated experiments as claims.
[0017]
Adjustments filter 1, in order to suppress the undulation of the laminated phase plate 2 that have a predetermined optical characteristic, a laminate of glass plate 3 via the adhesive layer 4 on the surface of the laminated retardation plate 2 configuration It is. The glass plate 3 exhibits a supporting action, and the undulation of the laminated phase difference plate 2 is suppressed to some extent.
[0018]
However, simply suppressing the undulation of the laminated phase difference plate 2 with the glass plate 3 is not satisfactory in terms of resolution.
[0019]
Therefore, not only to reduce the waviness of the glass plate 3 supported by and laminated phase plate 2, was subjected to a flattening process to further the surface of the laminated phase plate 2 is obtained an extremely high-resolution video , color correction filter 1 was very Soo is as an optical member was obtained.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
The drawings illustrate one embodiment of the present invention and are described below.
[0021]
This embodiment is a filter for color correction, the color tone correction filter 1 is laminated a plate-shaped laminated phase plate 2 and the glass plate 3 having a predetermined optical property via the adhesive layer 4 It has been a configuration, in which those prior Symbol flattening treatment on the surface as a laminated retardation film 2 is applied is employed.
[0022]
Laminated phase plate 2 is so even stacked several tens of very thin film-like retardation plate having a predetermined optical characteristic.
[0023]
In this type of laminated phase difference plate 2 , each phase difference plate is configured to rotate the vibration direction of light having a predetermined wavelength by a predetermined amount. By rotating the vibration directions of light of different wavelengths by different amounts, the ease of transmission of the light of each wavelength is adjusted (corrected), so that the final brightness of the image to be viewed can be set for each wavelength. It is possible to obtain an image with good color tone with brightness.
[0024]
As the glass plate 3 and the adhesive layer 4 , those having an appropriate refractive index and transmittance according to the performance of the laminated retardation plate 2 and the light to be transmitted are adopted.
[0025]
In general reflective liquid crystal projector 5 color correction filter 1 that is used, the refractive index of the laminated phase plate 2 is 1.585, the refractive index is 1.52 of the glass plate 3, the refractive index of the adhesive layer 4 Is 1.46. This embodiment, the one used for a color correction filter 1 of this general type can be used as it is.
[0026]
Further, it is preferable that the glass plate 3 is made of silica glass having good transmittance, and the sticking layer 4 is made of UV curable resin or silicon (adhesive) having good transmittance and sticking property.
[0027]
The glass plate 3 and the adhesive layer 4 are provided so as to sandwich the plate-like laminated phase difference plate 2 .
[0028]
The planarization process is preferably a polishing process.
[0029]
Further , when a film portion (a portion where a plurality of the retardation plates are laminated) that exhibits predetermined optical characteristics is directly polished by the laminated retardation plate 2 , the outermost layer portion of the film portion is polished to change the optical characteristics. Therefore, a method of forming a protective film that does not affect the optical characteristics of the film part on the surface of the film part, and polishing and flattening the protective film may be employed.
[0030]
Adjustments filter 1 of this embodiment, can be used for various optical members such as a general transmissive liquid crystal projector, high brightness, high color tone when used for a reflective liquid crystal projector 5 can appreciate the high-resolution video , Its performance is fully utilized.
[0031]
The reflective liquid crystal projector 5 will be described in detail.
[0032]
In the reflection type liquid crystal projector 5, light emitted from a predetermined light source is reflected by a liquid crystal plate to become corrected image light 12, and the corrected image light 12 forms an image. Unlike the transmissive type in which light is transmitted through the liquid crystal plate, the reflective liquid crystal projector 5 has a configuration in which the light is reflected by the liquid crystal plate, so that a high-luminance image can be obtained as much as the light does not pass through the liquid crystal plate.
[0033]
In the reflective liquid crystal projector 5, color tone adjustment (correction) is performed. The adjustment of the color tone, allowed to transmit image light before Symbol color correction filter 1, and the light of a predetermined wavelength constituting the incident light 10 respectively spectrally and subsequently, the corrected spectral corrects the spectrally The correction spectrum is condensed into corrected video light 12, and the corrected video light 12 is projected as a video light onto a projection unit such as a screen.
[0034]
The spectroscopic and correction mechanism will be described in detail with reference to FIG. 2. First, the incident light 10 does not change the vibration direction of the R (red) component and the B (blue) component, and the vibration of the G (green) component. The direction is transmitted through the first GM filter 20 (1 / 2λ plate = 1/2 phase difference plate, the same applies hereinafter) rotated 90 °. By passing through the first GM filter 20, the R component and the B component of the incident light 10 become light whose rotation direction is not rotating (reference numerals 11RS and 11BS, respectively), and the G component is rotated by 90 ° in the vibration direction. Light (reference numeral 11GP).
[0035]
This light (11RS / 11GP / 11BS) is transmitted through the first PBS 31.
[0036]
The PBS is called a polarization beam splitter, and is a device that separates light having different vibration directions. In the drawing, light whose vibration direction is rotated by 90 ° (light whose vibration direction is parallel to the paper surface) travels straight, and light whose vibration direction is not rotated (light whose vibration direction is orthogonal to the paper surface) Although a PBS of a type in which the traveling direction is refracted by 90 ° is illustrated, there are various types of PBS other than this, and they are appropriately selected and adopted as necessary.
[0037]
In the first PBS 31, the G component (11GP) goes straight, and the R component (11RS) and the B component (11BS) are refracted by 90 °, so that the G component (11GP) and the R component (11RS) and B The component (11BS) is spectrally separated.
[0038]
The split R component (11RS) and B component (11BS) are transmitted through the first RB filter 21 (1 / 2λ plate). By passing through the first RB filter 21, the R component becomes light (reference numeral 11RP) whose vibration direction is rotated by 90 °, and the B component becomes light with the original vibration direction (reference numeral 11BS).
[0039]
Further, the first RB filter 21 is provided with a filter 7 in a laminated state for correcting the ease of transmission of the R component and the B component. The filter 7 is preferably provided on the emission side for ease of correction.
[0040]
The corrected R component and B component (11RP · 11BS) are transmitted through the second PBS 32. Here, the R component (11RP) goes straight, and the B component (11BS) is refracted by 90 ° in the traveling direction, so that the R component (11RP) and the B component (11BS) are split.
[0041]
The R component (11RP), the G component (11GP), and the B component (11BS) dispersed as described above are reflected on the liquid crystal plate (reference numeral LCD-R / LCD-) that reflects the light of the respective components and rotates the vibration direction by 90 °. G.LCD-B) and projected by the liquid crystal plate. The R component (11RP), the G component (11GP), and the B component (11BS) are corrected by the reflection on the liquid crystal plate, resulting in a corrected spectrum having a good color tone (reference numerals 11RSa, 11GSa, and 11BPa).
[0042]
Further, between the first PBS 31 and the liquid crystal plate for G component (LCD-G), the difference in optical path length between the G component and the dispersed R component and B component is eliminated, and the G A third PBS 32 for condensing the component and the R component and B component is provided. The G component (11GP) passes through the third PBS 32 and is then corrected by the liquid crystal plate (LCD-G) to become a corrected G component (11GSa). The corrected G component (11GSa) is reflected by the liquid crystal plate (LCD-G) and then returns to the third PBS 33. At this time, the vibration direction is further rotated by 90 ° to return to the original vibration direction. Then, the light is refracted by 90 ° by the third PBS 33 and transmitted.
[0043]
Also, the R component (11RP) becomes the corrected R component (11RSa), and after returning to the second PBS 32, the vibration direction is further rotated by 90 ° to return to the original vibration direction. Will be transmitted.
[0044]
Further, the B component (11BS) becomes the corrected B component (11 BPa), and after returning to the second PBS 32, the vibration direction is rotated by 90 °.
[0045]
The corrected R component (11RSa) and the corrected B component (11BPa) are transmitted through the second RB filter 22 (1 / 2λ plate). By passing through the second RB filter 22, the correction R component (11RSa) is further rotated by 90 ° in the vibration direction to become light (reference numeral 11RPa) having the vibration direction rotated by 90 ° with respect to the original state. The component (11 BPa) is not polarized and remains as light with the vibration direction rotated 90 °.
[0046]
Further, the second RB filter 22 is provided with a filter 8 in a laminated state for correcting the ease of transmission of the R component and the B component. This filter 8 is also preferably provided on the emission side for ease of correction.
[0047]
The correction G component (11GSa) is not polarized in the vibration direction of the G component, and is transmitted through the GF filter 23 (1 / 2λ plate) rotated by 90 ° in the vibration directions of the R component and the B component. The corrected G component (11GSa) simply passes through the GF filter 23.
[0048]
The correction R component (11RPa) and the correction B component (11BPa) transmitted through the second RB filter 22 are transmitted through the fourth PBS. Here, the correction R component (11RPa) and the correction B component (11 BPa) are both in a state in which the vibration direction is rotated by 90 °, and thus pass straight through the fourth PBS.
[0049]
Further, the corrected G component (11GSa) transmitted through the GF filter 23 is also transmitted through the fourth PBS 34. Here, since the correction G component (11GSa) is in a state where the vibration direction has returned to the original vibration direction, it is refracted by 90 ° by the fourth PBS 34, thereby the correction R component (11RPa) and the correction B component (11BPa). The direction is the same as the direction of travel. That is, the R component, G component, and B component separated from the incident light 10 are corrected for each while appropriately changing the vibration direction, condensed by the fourth PBS 34, and become the corrected video light 12.
[0050]
Then, the corrected image light 12 formed by the fourth PBS 34 passes through the second GM filter 24 (1 / 2λ plate) for aligning the vibration direction, thereby rotating the vibration direction of the correction G component by 90 °. Then, the light is projected from the lens 35 onto a projection unit such as a screen.
[0051]
Since the reflection type liquid crystal projector 5 is configured so that the R component, G component, and B component constituting the image light are appropriately corrected as described above, the image of high brightness, high color tone, and high resolution can be viewed. It will be possible.
[0052]
In this reflection type liquid crystal projector 5, before Symbol color correction filter 1 is provided at a position between the second GM filter 24 and the lens 35. Adjustments filter 1 correcting the high tone of light (correction image light 12) projected on the final projection unit, is intended to achieve high resolution, the position is at the optimal position for final correction is there.
[0053]
Further, in the reflective liquid crystal projector 5, before Symbol color correction filter 1 is configured to provide integrally with the second GM filter 24, a configuration is provided at the position of the second GM filter 24 in place of the second GM filter 24 Also good. The latter can be used when the vibration directions of the corrected image light 12 do not have to be uniform.
[0054]
Further, if the filters 7 and 8 for adjusting the easiness of transmission are the same as those in the present embodiment, a higher color tone and higher resolution can be achieved.
[0055]
This embodiment because configured as described above, color tone becomes Xiu the color correction filter on the utility that resolution can appreciate the high video.
[0056]
Further, by combining with the reflective liquid crystal projector 5, it is possible to appreciate images with extremely high brightness, color tone and resolution.
[0057]
Hereinafter, an experimental example in which the effect of this example was confirmed will be described in detail.
[0058]
Adjustments filter 1 used in each experimental example, both a configuration in which allowed laminated glass plate 3 via the respective adhesive layer 4 on the upper and lower surfaces of the laminated retardation plate 2 (see FIG. 1). The refractive index of the laminated phase difference plate 2 is 1.585, the refractive index of the adhesive layer 4 is 1.46, and the refractive index of the glass plate 3 is 1.52.
[0059]
Experimental example 1
The conventional glass plate 3 has a thickness of 0.5 mm. In order to enhance the supporting action of the glass plate 3, the thickness of each glass plate was set to 1.1 mm.
[0060]
The resulting color correction filter 1 a reflective liquid crystal projector 5 with, rather than the conventional but become a high resolution, was still dissatisfied.
[0061]
Experimental example 2
In order to further enhance the supporting action of the glass plate 3, the thickness of each glass plate was set to 1.6 mm.
[0062]
The resulting color correction filter 1 a reflective liquid crystal projector 5 with are those in Experimental Example 1 of the same level, that only support of the glass plate 3 is limited to high resolution it has been found.
[0063]
Experimental example 3
The surface of the glass plate 3 in Experimental Example 1 was physically polished (optically polished), considering that the surface of the glass plate 3 had waviness and the waviness hindered high resolution.
[0064]
The resulting color correction filter 1 a reflective liquid crystal projector 5 with became even more than Example 1 of the high resolution.
[0065]
However, this Experimental Example 3 has a problem in that an antireflection coating cannot be provided on the surface of the glass plate 3 (if an antireflection coating is formed in advance, the antireflection effect is degraded by polishing. In addition, if an anti-reflection coating is formed after polishing, the effect of polishing the corner will be lost.) When there was no such problem, it was considered that Experimental Example 3 could be adopted.
[0066]
Experimental Example 4
It focuses that allowed to eliminate waviness of color correction filter 1 filter action laminated phase plate 2 itself you exert, polished surface (upper surface and rear surface) as the laminated phase plate 2 of Experimental Example 1 (optically polished) I tried to use what was flattened by (equivalent to this example).
[0067]
The resulting color correction filter 1 a reflective liquid crystal projector 5 with became even more high resolution Experimental Example 3.
[0068]
Moreover, according to the structure of this experiment example 4, it was thought that appropriate coating layers, such as an anti-reflective coating, can be provided in the surface of the glass plate 3, and it was thought that versatility was very high.
[0069]
The above experimental results, color correction filter 1 of this embodiment it was confirmed that those very soo are as filter for color correction.
[Brief description of the drawings]
FIG. 1 is an explanatory side sectional view showing the structure of a color correction filter 1 of the present embodiment.
FIG. 2 is an explanatory diagram showing a structure of a reflective liquid crystal projector 5 of the present embodiment.
[Explanation of symbols]
1 color tone correction filter 2 laminated phase difference plate 3 glass plate 4 adhesive layer 5 reflective liquid crystal projector
10 Incident light
12 Corrected image light

Claims (5)

Provided in front of the lens of the reflective liquid crystal projector, the incident light is split into R, G, and B, each of which is reflected by the liquid crystal plate and then subjected to a predetermined optical correction to be corrected spectrum. A method of manufacturing a color correction filter through which each corrected spectrum is condensed into corrected image light, and through which the corrected image light is transmitted, and is an upper surface of a laminated retardation plate formed by laminating a plurality of film-like retardation plates And after polishing and flattening so that the waviness of the laminated retardation plate disappears on the lower surface, a glass plate is pasted on the upper and lower surfaces of the laminated retardation plate so as to sandwich the laminated retardation plate. A method for producing a color tone correction filter, wherein the color tone correction filter is produced by laminating through an adhesion layer. The method for manufacturing a color correction filter according to claim 1, wherein an antireflection coating layer is provided on the surface of the glass plate. The method for manufacturing a color correction filter according to claim 1, wherein a refractive index of the laminated retardation plate is 1.585. 4. The method of manufacturing a color correction filter according to claim 3, wherein the refractive index of the glass plate is 1.52. 5. The method for manufacturing a color tone correction filter according to claim 4, wherein the adhesive layer has a refractive index of 1.46.

Images