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61. 发明专利

JPH0239772B2 失效
公开(公告)号：JPH0239772B2
公开(公告)日：1990-09-07
申请号：JP16407680
申请日：1980-11-21
申请人： SEIKO EPSON CORP
发明人： SONEHARA TOMIO , OKAMOTO NORIHISA
IPC分类号： G02F1/137 , G02F1/139

62. 发明专利

JPH02189519A REFLECTION TYPE LIQUID CRYSTAL ELECTROOPTIC DEVICE 失效
公开(公告)号：JPH02189519A
公开(公告)日：1990-07-25
申请号：JP1041289
申请日：1989-01-19
申请人： SEIKO EPSON CORP
发明人： ITO CHIHARU , SONEHARA TOMIO
IPC分类号： G02F1/133
摘要： PURPOSE:To obtain a steep threshold characteristic for the applied electric field of liquid crystal and to enable high-duty driving by putting incident light in a circular polarized state and a linear polarized state in a liquid crystal layer. CONSTITUTION:The light 108 which is made incident in parallel or at right angles to molecule axes nearby the incidence surface of twisted nematic liquid crystal 107 is polarized circularly and linearly at least once in a liquid crystal layer consisting of nematic liquid crystal 107, put in the circular polarized state on a reflecting surface and reflected, and polarized linearly and circularly at least once when passing while the liquid crystal layer 107, thereby obtaining linear polarized light whose plane of polarization is rotated by 90 deg. to the incident surface on a projection surface after reflection. Consequently, the threshold characteristic of the optical characteristics of the liquid crystal to the electric field is steep, the liquid crystal responds sufficiently to small effective value variation, and the reflection type liquid crystal electrooptic device which can be driven with high duty can be obtained.

63. 发明专利

JPH0233126A HOLOGRAPHIC ELECTRO-OPTICAL DEVICE 失效
公开(公告)号：JPH0233126A
公开(公告)日：1990-02-02
申请号：JP18381388
申请日：1988-07-23
申请人： SEIKO EPSON CORP
发明人： SONEHARA TOMIO
IPC分类号： G02F1/1335
摘要： PURPOSE:To activate an optical function of a holographic element by controlling a refractive index of an electro-optical medium by providing the holographic element for coming into contact with the electro-optical medium between electrodes for applying a control electric field, on the electrode or in the vicinity of the electrode. CONSTITUTION:Between electrodes 101 for applying a control electric field, a nematic liquid crystal 102 being an electro-optical medium is held, and a grating 103 being a holographic element is installed so as to come into contact with the nematic liquid crystal 102. Also, its outside surface is supported by a transparent substrate 104, and an external power source 105 is connected to the electrode 101. When an electric field is applied, a liquid crystal 106 is reoriented in the electric field direction, and an incident laser light 107 is brought to linear polarization in the direction for receiving a variation of a refractive index anisotropy of the liquid crystal. The incident laser light 107 is diffracted by the grating and a diffracted light transmits through in order from zero-th order, but by controlling an electric field applied to the liquid crystal layer 106, an angle of diffraction of the grating 103 is varied.

64. 发明专利

JPH01262504A PHOTOCONDUCTION TYPE DISPLAY DEVICE 失效
公开(公告)号：JPH01262504A
公开(公告)日：1989-10-19
申请号：JP9099788
申请日：1988-04-13
申请人： SEIKO EPSON CORP
发明人： SONEHARA TOMIO , SUGIYAMA ATSUSHI
IPC分类号： G02B6/04
摘要： PURPOSE:To obtain the photoconduction type display device having a uniform and high display grade by projecting the incident light by which an optical shutter is irradiated diagonally to the optical shutter. CONSTITUTION:The angle at which the optical shutter is coupled to a fiber is specified to an angle excluding a right angle. The use of the display device at the angle of the max. contrast is, therefore, possible even if there is a change in the display contrast by the direction of the incident light 902 as with an LCD 901. Namely, the performances of respective modes can be effectively utilized to the max. extent by the diagonal incidence of the light source light to the optical shutter. About 0-30 deg. angle with the central angle of the incident light is preferably provided in case of an LCD of a general TN mode. The photoconduction type display device having the uniform and high contrast is obtd. by the incidence of the incident light by which the optical shutter is irradiated diagonally to the optical shutter in such a manner.

65. 发明专利

JPH01241528A IMAGE FORMING DEVICE 失效
公开(公告)号：JPH01241528A
公开(公告)日：1989-09-26
申请号：JP6845788
申请日：1988-03-23
申请人： SEIKO EPSON CORP
发明人： ITO CHIHARU , SONEHARA TOMIO
IPC分类号： G09F9/30 , G02F1/133 , H04N1/23 , H04N9/12
摘要： PURPOSE:To improve image formation efficiency when a light beam is in the image forming effective area of a liquid crystal light bulb by making the polarity of an electric field in a direction reverse to a photoconductive layer. CONSTITUTION:Frequency scanning the light beam 113 in a scanning line direction and the frequency of an AC field driving the liquid crystal light bulb 105 are equalized. When the light beam 113 is in the recording effective area of the liquid crystal light bulb 105, the polarity of the electric field is made in the direction reverse to the photoconductive layer. When the light beam 113 is out of the recording effective area of the liquid crystal light bulb 105, that is, at the time of fly-back regression, the polarity of the field is made to be in a forward direction with respect to the photoconductor. When the field impressed on the liquid crystal light bulb 105 is in a reverse bias direction, the liquid crystal light bulb 105 is irradiated with the light beam 113 modulated by a video signal source 112 so as to form images. Thus, the occurrence of illuminance unevenness on a plane is eliminated. A driving field is simple, thereby simplifying the signal processing of the driving field.

66. 发明专利

JPH01219815A IMAGE FORMING DEVICE 失效
公开(公告)号：JPH01219815A
公开(公告)日：1989-09-01
申请号：JP4668088
申请日：1988-02-29
申请人： SEIKO EPSON CORP
发明人： ITO CHIHARU , SONEHARA TOMIO
IPC分类号： B41J2/44 , B41J3/00 , G02B26/10 , H04N1/04 , H04N1/113 , H04N1/23
摘要： PURPOSE:To miniaturize the device and to lower its cost by setting the number of faces of a rotatory polygon mirror to measures in which one is excluded of the total of scanning lines, and also setting the number of light beam generating means to measures except one, which is obtained by dividing the number of faces of the rotatory polygon mirror by the total of scanning lines, and by searching measures of the quotient. CONSTITUTION:The number of the light beam generating means is set to the measure 3 (101, 102, 103) except one out of 21, which is obtained by dividing the number of faces 25 of the rotatory polygon mirror 107 by the number of scanning lines. Because the number of the light beam generating means 101, 102 and 103 is set at three, three scanning lines are formed on a screen 110 at the same time. Therefore, rotatory speed of the rotatory polygon mirror 107 needs only 1/3 of scanning speed. When NTSC signal is given, rotating speed is determined by 15,750X60divided by Ndivided by 3rpm (N is the number of faces of the rotatory polygon mirror). Consequently, the device is miniaturized and its cost is lowered.

67. 发明专利

JPH01211732A METHOD FOR DRIVING LIQUID CRYSTAL LIGHT VALVE 失效
公开(公告)号：JPH01211732A
公开(公告)日：1989-08-24
申请号：JP3669188
申请日：1988-02-19
申请人： SEIKO EPSON CORP
发明人： ITO CHIHARU , SONEHARA TOMIO
IPC分类号： G09G3/18 , G02F1/133
摘要： PURPOSE:To display a clear moving picture without generating any irregularity in illuminance on a screen by controlling the writing and erasure of a liquid crystal light valve with the quantity of light projected on a photoconductive layer. CONSTITUTION:A laser beam light source 401 for image erasure is modulated by a modulator 402. A laser beam light source 403 for image writing is modulated by a modulator 405 according to a video signal source 404. When optical writing is performed, the quantity of the light projected on the photoconductive layer is so set that a current flowing out of the photoconductive layer is a negative direction is larger than a current flowing out in a positive direction. Further, when the picture elements are erased, the quantity of the light projected on the photoconductive layer is so set that the photoconduction current is smaller than in the optical recording and the currents flowing out of the photoconductive layer in the positive and negative directions are nearly equal to each other. Consequently, the erasure and formation of picture elements are performed only by adjusting the quantity of the projected light and display quality is improved.

68. 发明专利

JPH01211731A METHOD FOR DRIVING LIQUID CRYSTAL LIGHT VALVE 失效
公开(公告)号：JPH01211731A
公开(公告)日：1989-08-24
申请号：JP3668788
申请日：1988-02-19
申请人： SEIKO EPSON CORP
发明人： ITO CHIHARU , SONEHARA TOMIO
IPC分类号： G09G3/18 , G02F1/133
摘要： PURPOSE:To display a clear moving picture without generating any irregularity in illuminance on a screen by controlling the writing and erasure of the liquid crystal light valve with the wavelength of light which is projected on a photocondutive layer. CONSTITUTION:A laser beam light source 501 for image erasure is modulated by a modulator 502. A laser beam light source 503 for image writing is modulated by a modulator 505 according to the laser beam light source 501 for erasure. The wavelength of the light projected by the laser beam light source 501 for erasure on the photoconductive layer is so set that the photoconductive current is smaller in picture element erasure than in optical recording and a current current flowing out of the photoconductive current is almost equal between the positive and negative sides. The wavelength of the laser beam light source 503 for writing is so set that the current flowing out of the photoconductive layer in the negative direction is larger than the current flowing out in the positive direction. Consequently, the erasure and formation of picture elements are performed only by varying the wavelength of the projected light and display quality is improved.

69. 发明专利

JPH01189687A LIGHT TRANSMISSION TYPE DISPLAY DEVICE 失效
公开(公告)号：JPH01189687A
公开(公告)日：1989-07-28
申请号：JP1425588
申请日：1988-01-25
申请人： SEIKO EPSON CORP
发明人： SUGIYAMA ATSUSHI , SONEHARA TOMIO
IPC分类号： G02B27/28 , G09F9/30 , H04N5/74
摘要： PURPOSE:To effectively utilize a light generated from a light source and to allow a light transmission type display device to be low energy consumption, compact and a low cost by using an element dividing a polarizing component for the polarizing surface limit of a light supplied to an optical shutter. CONSTITUTION:As the element dividing the polarizing component of an incident light, a polarizing beam splitter 101 is used. As an image forming device, a liquid crystal photo-electric element 102, which is the optical shutter, is used. Then, each one pair of the elements 102, which do not have an upper polarizing plate, are used to respective emitting lights from the splitter 101, which is respectively divided into one side polarizing component. The element 102 prepares a liquid crystal panel to use a thin film transistor as an active matrix and uses a prescribed polarizer. For a light transmission body to optically couple the light on the display surface, an optical fiber 103 is used. Thus, the bidirectional rays of light of vertical polarization and horizontal polarization can be used and since the using rate of the light goes to nearly be doubled, the generating light quantity of a light source can be suppressed to be almost 1/2 and the energy consumption of the light source can be lowered. Then, by accompanying such effect, the whole device can be miniaturized and the low cost can be obtained.

70. 发明专利

JPH01189616A PHOTOCONDUCTIVE TYPE DISPLAY DEVICE 失效
公开(公告)号：JPH01189616A
公开(公告)日：1989-07-28
申请号：JP1483288
申请日：1988-01-26
申请人： SEIKO EPSON CORP
发明人： SUGIYAMA ATSUSHI , SONEHARA TOMIO
IPC分类号： G02B6/32 , G09F9/00
摘要： PURPOSE:To easily and surely attain the optical combination between a picture forming device and a photoconductor by carrying out the optical combination between the picture forming device and the photoconductor with an arranged lens group. CONSTITUTION:The optical combination between a picture forming device 101 of a liquid crystal electro-optical element, etc., and a photoconductor 104 using, for example, a plastic optical fiber is carried out by a lens group 103 arranged between them. A microlens array MLA is used for the lens group 103, and when the MLA is formed, by carrying out heating-pressing to for example, an acrylic resin, the MLA, whose diameter is the same as that of the optical fiber and whose array is the same as that of the optical fiber of the picture forming device, can be easily formed. As this result, the optical combination between the picture forming device 101 and the photoconductor 104 is easily and surely attained, and misregistration due to temperature change, etc., can be sufficiently coped with.

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