WO2013121671A1 - Method and device for creating light guide plate for liquid crystal tv - Google Patents

Method and device for creating light guide plate for liquid crystal tv Download PDF

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Publication number
WO2013121671A1
WO2013121671A1 PCT/JP2012/082523 JP2012082523W WO2013121671A1 WO 2013121671 A1 WO2013121671 A1 WO 2013121671A1 JP 2012082523 W JP2012082523 W JP 2012082523W WO 2013121671 A1 WO2013121671 A1 WO 2013121671A1
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WO
WIPO (PCT)
Prior art keywords
guide plate
light guide
print data
light
liquid crystal
Prior art date
Application number
PCT/JP2012/082523
Other languages
French (fr)
Japanese (ja)
Inventor
要一 阿部
智雄 中嶋
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武藤工業株式会社
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Filing date
Publication date
Application filed by 武藤工業株式会社 filed Critical 武藤工業株式会社
Publication of WO2013121671A1 publication Critical patent/WO2013121671A1/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0065—Manufacturing aspects; Material aspects
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
    • G02B6/0043—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided on the surface of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133611—Direct backlight including means for improving the brightness uniformity

Definitions

  • the present invention relates to a method and an apparatus for producing a light guide plate for a liquid crystal TV (television).
  • the present invention creates print data for light reflection used for a light guide plate by image creation software stored in a computer, transfers the created print data to an inkjet printer, A method of creating a light guide plate for a liquid crystal TV by performing reflection printing on a printing surface of a light guide plate with white ink on a printing surface of the light guide plate by using a printer to scatter light emitted from the light source into the light guide plate.
  • a process of creating a luminance distribution pattern diagram for a liquid crystal TV light guide plate in advance, a process of creating print data for light reflection by image software with reference to the reference luminance distribution pattern diagram, and inkjet printing the print data A process for converting the print data to a discharge format and a process for printing the print data on the printing surface of the light guide plate by an inkjet printer. Characterized by comprising and. Further, according to the present invention, the process of creating the print data displays a reference luminance distribution pattern diagram side by side with a print data creation edit area on a computer screen, or displays a reference luminance distribution pattern diagram in the print data creation edit area. It is characterized by being displayed overlaid.
  • the present invention also includes a process of mounting a printed light guide plate on an LED lighting stand and measuring the luminance of the light emitting surface of the light guide plate to create a luminance distribution pattern diagram, the measured luminance distribution pattern, and the reference And a process of comparing the luminance distribution patterns and determining the quality of the print data.
  • the present invention is also characterized in that the reference luminance distribution pattern diagram and the measured luminance distribution pattern diagram express the luminance in color.
  • the print data is composed of a gradation pattern.
  • the present invention is characterized in that the dot diameter or print pattern of the print data corresponds to the thinness of the TV liquid crystal panel so that the dots on the printing surface of the light guide plate are not reflected on the liquid crystal panel.
  • the ink jet printer is provided with a white ink supply unit that stores a plurality of types of white ink for determining the color temperature of the light emitting surface of the light guide plate in an ink tank for each type.
  • a recording head is provided, and one of the ink tanks is connected to each recording head so that each recording head can eject different types of white ink, and the ink jet printer is connected to the light guide plate.
  • the reflection printing is formed, and a light guide plate having a color temperature corresponding to a selected combination of one type or a plurality of types of white ink is created.
  • the present invention is also characterized in that the plurality of types of white inks that determine the color temperature of the light emitting surface of the light guide plate have different particle size distributions of titanium oxide in the respective inks.
  • the present invention is also characterized in that the plurality of types of white inks that determine the color temperature of the light emitting surface of the light guide plate have different proportions of titanium oxide content in the respective inks.
  • the present invention also includes an inkjet printer and a computer storing image creation software for creating print data of the light reflection pattern.
  • the print data of the light reflection pattern is transferred to the ink jet printer and is guided by the ink jet printer.
  • a device for producing a light guide plate by applying reflection printing for scattering light emitted from a light source to the inside of the light guide plate on a printing surface of the light plate using white ink containing titanium oxide, and printing on a computer
  • the print density is increased toward the set high density set point, and the result of measuring the luminance distribution pattern of the light guide plate is approximated to the reference luminance distribution pattern diagram. To do.
  • the present invention can provide a liquid crystal TV light guide plate having a luminance distribution pattern required for a liquid crystal TV light guide plate.
  • FIG. 4 and 6 are schematic views of a light guide plate printing apparatus including the inkjet printer 2 and a computer 4 such as a personal computer connected to the controller of the printer 2 via an input / output interface.
  • the light guide plate 6 is detachably held on the table 8 of the printing apparatus with the printing surface 6b on the back side of the light emitting surface 6a facing up.
  • Printing (printing) on the light guide plate 6 is performed in units of prints in which the horizontal rail 10 is set in one direction (sub-scanning direction) under the control of the printing apparatus main body drive unit.
  • the head carriage 20 including the ink jet recording heads 12, 14, 16, 18 is moved in the main scanning direction perpendicular to the conveying direction of the horizontal rail 10.
  • print data that ejects ink from the nozzles of the recording heads 12 to 18 and is transferred from the computer 4 to the controller of the ink jet printer 2 is stored in the controller. Is printed on the printing surface 6b of the light guide plate 6. Note that printing in the sentence is synonymous with printing.
  • the storage device of the computer 4 stores a print program for controlling the controller of the inkjet printer 2 and performing printing.
  • a horizontal rail 10 is arranged on the table 8 so as to be movable in the sub-scanning direction, and a head carriage 20 is connected to the horizontal rail 10 so as to be movable in the main scanning direction.
  • the head carriage 20 holds a plurality of ink jet recording heads 12, 14, 16, 18 as shown in FIG.
  • Each recording head 12, 14, 16, 18 includes a large number of nozzles that eject ink. As shown in FIG. 7, each head 12, 14, 16, 18 has an ink tank 22 corresponding to each of the white ink supply units A, B, C, D provided with an ink tank disposed in the body of the printer 2. , 24, 26, and 28 via an ink supply means such as a tube.
  • the plurality of recording heads 12, 14, 16, 18 are arranged in parallel so that their print areas overlap in the main scanning direction along the horizontal rail 10.
  • the storage device of the computer 4 stores software (print program) for creating print data of the light reflection pattern, and an ink data table 30 is provided.
  • This data table 30 is used to create light guide plates with various color temperatures by printing a plurality of types of white inks A, B, C, and D individually or in combination on the light guide plate 6. In addition, combinations of color temperatures and inks A, B, C, and D are set in advance. By using this data table 30, light guide plates having various color temperatures can be easily created. It is.
  • white inks A and B indicate two types of inks having different color temperatures with respect to the particle diameter of titanium oxide
  • white ink C has a content of titanium oxide in white ink A.
  • a different white ink is shown, and a white ink D is a white ink having a titanium oxide content different from that of the white ink B.
  • the content of titanium oxide in the white ink is desirably 10% or less, and experimentally it is easy to control the fine gradation brightness change of the light-emitting surface of the light guide plate by lowering the titanium oxide content. It has been confirmed.
  • the printing program for printing control stored in the computer 4 is configured so that the ink data table 30 can be created and corrected.
  • the produced light guide plate 6 is obtained by printing reflection dots or reflection gradation (fine dots such as frosted glass) on the plane portion of the printing surface 6b of the light guide plate such as a transparent acrylic plate. 11, by arranging a light source 40 made of a light emitter such as a cold-cathode tube or an LED in the thickness portion of the upper edge 32 of the rectangular light guide plate 6, the entire plane of the light emitting surface 6 a emits light. It looks like you are.
  • titanium oxide ink prepare white ink with different color temperature depending on the particle size distribution of titanium oxide in the ink, and if the dispersion of the particle size distribution is changed, there will be a difference in reflected light. There is a difference in color temperature. This is because the particle diameter of titanium oxide in the ink is different, so that the intensity of light scattered after printing differs depending on the wavelength of light, and as a result, the color temperature of the scattered light of the printed light guide plate is different.
  • White ink uses titanium oxide as an ink pigment. Titanium oxide particles have the property of reflecting light with a wavelength twice as large as the particle diameter, and as an ideal white ink, the distribution of titanium oxide particle diameter is uniform between 200 nm and 400 nm as shown in FIG. Is to exist. In this case, the color becomes white which uniformly reflects light 400 nm to 800 nm (visible light) having a wavelength twice as large as the particle diameter 200 nm to 400 nm.
  • desired wavelength range of light can be obtained by adding other particles, copper phthalocyanine, or by changing the content ratio of titanium oxide.
  • a plurality of types of white inks having different titanium oxide particle diameter distributions or different titanium oxide content ratios are prepared and used in combination.
  • the printer includes only one type of white ink, and the particle diameter distribution state of titanium oxide in the ink is adjusted in advance to a desired distribution state or oxidized.
  • the ratio of the titanium content may be adjusted and printing may be performed on the light guide plate using the adjusted white ink.
  • the printer has only one type of white ink, and the distribution state of titanium oxide in the ink is adjusted in advance to a desired distribution state, and printing is performed on the light guide plate using the adjusted white ink. May be prepared, and different types of white ink may be used for each printer, and one of them may be designated as necessary to create a light guide plate having a desired color temperature.
  • FIGS. 19 to 21 are distribution image diagrams of the particle diameter of titanium oxide in the ink.
  • the horizontal axis represents the particle diameter, and the vertical axis represents the degree of distribution.
  • FIG. 19 shows an ideal particle size distribution of titanium oxide particles in white ink
  • FIGS. 20 to 21 show an actual particle size distribution of titanium oxide particles in white ink.
  • a small amount of copper phthalocyanine is added to the ink used in this embodiment.
  • the amount of this addition has been experimentally selected so that the color temperature of the ink can be easily controlled by selecting an appropriate amount experimentally.
  • the operator can select the white ink A, B, C, D by hitting the ink selection button 48 displayed on the display 46 of the computer 4 with a mouse or the like.
  • the mixing button 50 by operating the mixing button 50, the white ink can be mixed in a desired combination. It is also possible to specify a plurality of inks such as A and B, A and C, and to specify what ink is to be used in which print portion in correspondence with the created print data. .
  • FIG. 13 shows reflective surface print data 56 created on a computer using print data creation software for creating a reflection pattern of the light guide plate.
  • the print data 56 generated in the rectangular area according to the rectangular shape of the light guide plate is formed so that the print density (density) increases toward the high density setting point set in the rectangular area. Since the reflection pattern is printed on the light guide plate, printing is performed on the whole, and the gradation direction of the print density in the print is shown.
  • FIG. 13 is an example, and the shape and the like are not particularly limited thereto.
  • FIG. 23 shows a three-dimensional image of the print density (print density) of the print data 66.
  • the symbol P indicates a high density set point.
  • the high density setting point is not particularly limited to one point, and may have a certain extent (space) in four directions in FIG.
  • numeral 1 indicates the direction of the light source
  • numerals 1 to 7 indicate that the distance between the light source side edge 60 and the opposite edge 62 facing the print data 56 is divided into seven equal parts.
  • S1, S3 and S5 indicate the scale between the left and right edge portions 64 and 66.
  • the high density setting point P is set near the lower center of the rectangular area, and the part with the high print density is gathered at this point. It is necessary to increase the reflectivity as the distance from the light source increases. This is because there is a part affected by reflection returning from the other peripheral end part (refer to FIG. 10), so even if the print pattern data is created in consideration of that part. good.
  • the print data 56 is created with a gradation pattern.
  • gradation refers to a print density change pattern formed by the gradation pattern generation mode of the print data creation software.
  • the print density can be changed between 0% and 100%.
  • FIG. 14 is an explanatory diagram of the density in the gradation pattern diagram. In FIG. 14, (A) is 0%, (B) is 25%, (C) is 50%, (D) is 75%, and (E). Indicates 100% concentration. Note that FIG. 14 is merely a simplified description. In actual printing, printing is performed with a large number of dots, and therefore, the printing place is designated according to the resolution of the printer, and its range. Printing within an arbitrary range such as 0 to 100% is possible.
  • the first density changing portion forms a gradation pattern from the light source arrangement side edge 60 of the print data 56 in a state where the print density is low with respect to the high density set point set in the print area.
  • An arrow a indicates a state in the first density changing portion where the density increases from a low density state toward the arrow direction, that is, toward the high density setting point.
  • gradation is formed from a state in which the print density is reduced toward the high density set point in the print area within a relatively short range from the edge 62 on the side opposite to the light source arrangement side edge 60. As shown, it is formed by changing it until it becomes the darkest state.
  • An arrow b indicates a state in the second density changing portion where the density increases from a low density state toward the arrow direction, that is, toward the high density setting point. From both the left and right edge portions 64 and 66, the print density is changed from a light state to a darkest state so that a gradation pattern is gradually formed toward a high density set point in the print region within a relatively short range. Thus, the third density changing portion and the fourth density changing portion are formed.
  • An arrow c indicates a state in which the density is increased from a light state in the direction of the arrow in the third density changing part
  • an arrow d indicates a state in which the density is increased in the direction of the arrow from a light state in the fourth density changing part. .
  • the print data 56 is designed with reference to the ideal reference luminance distribution pattern diagram 57 (see FIG. 3) of the light guide plate prepared in advance.
  • area a has a luminance of 1000 to 1500 (unit candela per square meter)
  • area b has a luminance of 1500 to 2500
  • area c has a luminance of 2500 to 3500
  • area d has a luminance of 3500 to 4000
  • area e Has a luminance of 4500-, and the luminance is displayed in color.
  • Each area corresponds to the light emitting surface 6a of the light guide plate.
  • FIG. 16 shows a luminance distribution pattern diagram 39 obtained from measured values of illumination emitted when an LED or the like is turned on using the prepared light guide plate in this embodiment, and is a reference luminance distribution pattern diagram. 57.
  • area a has a luminance of 1000 to 1500 (unit candela per square meter or less)
  • area b has a luminance of 1500 to 2500
  • area c has a luminance of 2500 to 3500
  • area d has a luminance of 3500 to 4000
  • area e has an area e of
  • Each area of luminance 4500 is shown, and each area is displayed in a color corresponding to the luminance. Further, each area corresponds to the light emitting surface 6a of the light guide plate, and reference numerals 32, 34, and 36 in FIG. 16 indicate portions corresponding to the edges 32, 34, and 36 of the light guide plate with the same numbers, and the correspondence relationship. Is shown.
  • FIG. 22 is a graph showing the relationship between dot density and luminance.
  • X indicates the light source direction
  • each horizontal axis indicates the distance from the light source.
  • the high density setting point is approximately in the middle between the left and right edges, and when the distance between the light source arrangement side edge 60 and the opposite edge 62 is 1, the distance from the edge 60 exceeds 1/2. Is set at an arbitrary position less than (that is, in front of the edge 62).
  • a peak of a high-density portion appears at a position about 6/7 from the edge 60.
  • the position depends on the material of the light guide plate used, the thickness, the type of ink, the brightness of the light source, and the like. For example, when the thickness of the light guide plate is reduced, a better result may be obtained by bringing the edge 62 closer to the center, such as 1/4 or 1/3.
  • the magnitude of the change in print density may be changed according to the conditions.
  • the print density is changed toward the leading end portion of the high density portion, that is, the high density setting point P, but the portion does not necessarily have to be in the leading end state as shown in FIG. You may make it change toward the above flat area
  • the high density setting point P is approximately at the center between the left and right edges and between the edge 60 and the opposite edge 62. If the distance between them is 1, it is desirable to set the distance from the edge 62 to approximately 1 ⁇ 2.
  • a liquid crystal display device such as a television or a liquid crystal monitor
  • the print data is transferred from the computer 4 to the printer 2, and after the data is processed by the printer 2, the horizontal rail 10 is conveyed and conveyed in the print width unit set in the sub-scanning direction, The head carriage 20 is driven in the main scanning direction, and printing is performed on the light guide plate 6 with white ink under the selected printing condition.
  • the thickness H of the ink dots 54 is about 0.5 ⁇ m, which is much thinner than screen printing (about 100 ⁇ m).
  • the light guide plate 6 brighter than the conventional one can be obtained by the synergistic effect of the light reflected from the white ink dots and the light transmitted through the ink and reflected from the reflection plate 72.
  • the content of titanium oxide is adjusted so that the brightness can be easily controlled by fine gradation printing.
  • the amount of reflection is changed accordingly, so that it is possible to cope with fine changes, thereby facilitating control of the amount of reflected light and the amount of scattering.
  • the content of titanium oxide in the white ink is 10% or less.
  • white ink with a content of about 1% is also prepared for finer control.
  • the brightness can be easily controlled by fine gradation, and if the dot diameter of about 100 ⁇ m necessary for filling 360 dpi is used, the printing speed can be increased.
  • printing may be performed with a dot diameter of about 50 ⁇ m necessary for filling 720 dpi.
  • the ink dot diameter is elliptical. Therefore, the ink dot diameter can be filled even in a narrow width direction at the resolution used.
  • Printing may be performed by combining the dot diameters.
  • the luminance data measured by the camera 74 (luminance is displayed in color) is displayed or printed out on the screen of the computer 4 as the luminance distribution pattern diagram 39, and compared with the ideal reference luminance distribution pattern diagram 57 as a reference. If the brightness distribution of the printed light guide plate 6 matches or approximates the ideal brightness distribution pattern, the print data creation work on the computer is completed. If satisfactory results are not obtained at this time, this operation is repeated until the print data is corrected and an ideal luminance distribution pattern is obtained.
  • the luminance distribution pattern of the luminance distribution pattern diagram 39 shown in FIG. 16 based on the luminance data measured by the camera 74 is slightly lower in the portion where the luminance is higher than the reference luminance distribution pattern diagram 57 referred to at the time of printing.
  • the print density of the corresponding portion of the print data shown in FIG. 13 is changed, or the position of the dark portion is corrected slightly upward. It is also conceivable to change the type of ink used at that position and the ink dot diameter used.
  • the light source 40 is arranged on one edge 32 of the light guide plate 6, but as shown in FIG. 12, the light sources 40, 40 may be arranged on both edges 32, 34.
  • the luminance distribution also changes, so a print pattern corresponding to the light distribution is required, and a portion having a high print density moves in the center direction in terms of data. Even if the luminance of the light source varies, a desired luminance distribution can be obtained by correcting the portion with the print pattern, and the difference between the light sources at both ends can be dealt with.
  • the medium is fixed and the apparatus in which the inkjet head moves is described.
  • the present invention is not limited to this, and printing is performed using an apparatus or a line head that performs printing by moving the medium. Any device that can perform printing by an ink jet method, such as a device that performs printing.
  • the inkjet printer can use a plurality of resolutions depending on the product specifications (for example, select and use a necessary print mode such as 180 to 1440 dpi), the resolution may be selected as necessary.
  • the process of creating the light guide plate will be described.
  • an image (print) creation software is used to create a print image pattern (print data) 56.
  • the reference luminance distribution pattern diagram 57 is created based on experimental data in consideration of human visual characteristics so that an optimal visual effect can be obtained when watching a television screen. It has high brightness and other unique brightness distribution patterns. In this luminance distribution pattern diagram, the magnitude of luminance is indicated by color (color).
  • Print data 56 is displayed in area A of print image pattern 56 creation screen 4a and reference luminance distribution pattern diagram 57 is displayed along with print data 56 in area B, or print pattern 56 and reference luminance pattern are displayed in area D.
  • FIG. 57 is superimposed and displayed, and the operator refers to the reference luminance distribution pattern FIG. 57 displayed on this screen and uses the gradation mode so that the corresponding density pattern is formed.
  • An image pattern 56, that is, print data 56 is created (step 1). If the computer used to create the print data is not the computer 4 connected to the inkjet printer 2, the created print data is transferred to the computer 4 and stored in the computer 4.
  • the printed reference luminance distribution pattern diagram 57 may be simply referred to without displaying the reference luminance distribution pattern diagram 57 on the screen.
  • the image pattern 56 is converted into an ink jet discharge format by RIP (Raster Image Processor) (step 2).
  • RIP Raster Image Processor
  • printing is performed on the light guide plate 6 by the inkjet printer 2 (step 3).
  • the printed light guide plate 6 is mounted on the LED lighting stand 72, and the brightness distribution of the light guide plate 6 is measured by photographing with the camera 74 (step 4).
  • the luminance distribution pattern diagram 39 of the light guide plate is output on the computer screen based on the output data of the camera 74 and printed (step 5).
  • the luminance distribution pattern diagram 39 of the printed light guide plate 6 and the reference luminance distribution pattern diagram 57 are compared on the computer screen or the two printed pattern diagrams 57 and 38 are visually compared (step). 6) It is determined whether or not the printed light guide plate 6 has a satisfactory luminance distribution pattern (step 7). If the determination result is unacceptable, the process returns to step 1 and the print data 56 is corrected. At the time of this correction work, as shown in FIG. 2, the operator displays the print data 56 in the area A of the computer screen 4a and arranges it along with the reference luminance distribution pattern diagram 57 in the areas B and C, respectively.
  • the measured luminance distribution pattern diagram 39 is displayed, or any combination of the print data 56, the reference luminance distribution pattern diagram 57, and the measured luminance distribution pattern diagram 39 is superimposed on the area D and displayed. If the determination result is acceptable, a prototype of the light guide plate is submitted to the requester (step 8). If the requester's evaluation is acceptable, the system shifts to the light guide plate mass production system. Return to.
  • Inkjet printer 4 Computer 6 Light guide plate 6a Light emitting surface 6b Printing surface 8 Table 10 Horizontal rail 12 Recording head 14 Recording head 16 Recording head 18 Recording head 20 Head carriage 22 Ink tank 24 Ink tank 26 Ink tank 28 Ink tank 30 Ink data table 32 Edge 34 Edge 36 Edge 38 Edge 39 Luminance distribution pattern diagram 40 Light source 42 Ink 44 Reflector 46 Display 48 Ink selection button 50 Mix button 52 Print rate button 54 Ink dot 56 Print data (print image pattern) 57 Reference luminance distribution pattern 58 Core portion 60 Edge portion 62 Edge portion 64 Edge portion 66 Edge portion 68 Prism sheet 70 Diffusion plate 72 LED lighting stand 74 Camera

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)

Abstract

The purpose of the present invention is to provide a light guide plate for a liquid crystal TV, in which favorable visual effects can be obtained. A luminance distribution pattern diagram for a liquid crystal TV light guide plate representing a reference is created in advance, and image software is used to create printing data for light reflection while referring to the reference luminance distribution pattern diagram. The created printing data is transferred to an inkjet printer; the printing data is converted to a inkjet discharge format using an RIP; reflective printing for causing irregular reflection of light beamed from the light source to the interior of the light guide plate is applied to the printing surface of the light guide plate using an inkjet printer; and the light guide plate for a liquid crystal TV is created.

Description

液晶ＴＶ用導光板作成方法及び装置Method and apparatus for creating light guide plate for liquid crystal TV
本発明は、液晶ＴＶ（テレビジョン）用導光板の作成方法及び装置に関する。 The present invention relates to a method and an apparatus for producing a light guide plate for a liquid crystal TV (television).
　液晶ＴＶ用の導光板の印刷は、従来スクリーン印刷によるものが一般的である。
　また、液晶ＴＶ用導光板以外の導光板をインクジェットプリンタで印刷することは従来知られている（例えば特許文献１参照）。
　また、導光板をグラデーション技術を用いて印刷することが従来知られている（例えば特許文献２参照）。 Conventionally, printing of a light guide plate for a liquid crystal TV is generally performed by screen printing.
In addition, it is conventionally known to print light guide plates other than the light guide plate for a liquid crystal TV with an ink jet printer (for example, see Patent Document 1).
Further, it is conventionally known to print a light guide plate using a gradation technique (see, for example, Patent Document 2).
特開平９ー６８６１４号公報JP-A-9-68614 実開平５－５５１０３号公報Japanese Utility Model Publication No. 5-55103
　近年ＴＶ画面用液晶パネルの薄型化が進みこれにスクリーン印刷の微細ドット化の技術が追いついていない。
　その結果、スクリーン印刷で印刷した導光板のインクドットが液晶パネルに映ってしまうという問題点が発生した。このドット見え現象の問題は、インクジェットプリンタで印字できる解像度で印刷することにより解決できるが、液晶ＴＶ用導光板をインクジェットプリンタで印刷する場合、人間の視覚の特性を考慮する必要があり、従来の光源に近い側から遠い側に向けて徐々に面積率を増加する技術（特許文献２）や、ドット密度を光源から遠ざかるにしたがって密となるようにする技術だけでは、特殊な輝度パターンが要求される液晶ＴＶ用の導光板に対応できないという問題点がある。
　本発明は、上記問題点を解決することを目的とする。 In recent years, liquid crystal panels for TV screens have become thinner, and the technology for making fine dots in screen printing has not caught up.
As a result, there arises a problem that the ink dots of the light guide plate printed by screen printing are reflected on the liquid crystal panel. This problem of dot appearance phenomenon can be solved by printing at a resolution that can be printed by an ink jet printer. However, when a light guide plate for a liquid crystal TV is printed by an ink jet printer, it is necessary to consider human visual characteristics. A special luminance pattern is required only with the technology that gradually increases the area ratio from the side closer to the light source toward the far side (Patent Document 2) or the technology that increases the dot density as the distance from the light source increases. There is a problem that it cannot be applied to a light guide plate for a liquid crystal TV.
The present invention aims to solve the above problems.
　上記問題点を達成するため、本発明は、コンピュータに格納された画像作成ソフトにより導光板に用いる光反射のための印字データを作成し、該作成した印字データをインクジェットプリンタに転送し、該インクジェットプリンタによって白インクで導光板の印刷面に、光源から導光板の内部に出射される光を乱射させるための反射印刷を施し、液晶ＴＶ用の導光板を作成する方法であって、基準となる液晶ＴＶ導光板用の輝度分布パターン図を予め作成するプロセスと、前記基準用輝度分布パターン図を参照して、画像ソフトにより光反射のための印字データを作成するプロセスと、前記印字データをインクジェットの吐出フォーマットへ変換するプロセスと、インクジェットプリンタで前記印字データを導光板の印刷面に印刷するプロセスとを備えたことを特徴とする。
　また本発明は、前記印字データを作成するプロセスは、コンピュータの画面の印字データ作成編集エリアと並べて基準用輝度分布パターン図を表示し、或いは、印字データ作成編集エリアに基準用輝度分布パターン図を重ねて表示するようにしたことを特徴とする。
　また本発明は、印刷の完了した導光板をＬＥＤ点灯台に装着し導光板の発光面の輝度を測定し、輝度分布パターン図を作成するプロセスと、前記測定した輝度分布パターンと、前記基準用輝度分布パターンを比較し、前記印字データの良否を判定するプロセスとを備えたことを特徴とする。
　また本発明は、前記基準用輝度分布パターン図と測定した輝度分布パターン図が輝度を色で表現したものであることを特徴とする。
　また本発明は、前記印字データがグラデーションパターンにより構成されていることを特徴とする。
　また本発明は、前記印字データのドット径または印刷パターンをＴＶ液晶パネルの薄さに対応させ、前記導光板の印刷面のドットが液晶パネルに映らないようにしたことを特徴とする。
　また本発明は、前記白インクの酸化チタンの含有量の割合を１０％以下としたことを特徴とする。
　また本発明は、前記白インクに銅フタロシアニンを添加したことを特徴とする。
　また本発明は、前記インクジェットプリンタに、前記導光板の発光面の色温度を決定する複数種類の白インクを種類ごとにインクタンクに収納した白インク供給部を設け、前記インクジェットプリンタに複数個の記録ヘッドを設け、前記各記録ヘッドに前記インクタンクの中の１つをそれぞれ接続して、各記録ヘッドが互いに種類の異なる白インクを吐出できるように成し、前記インクジェットプリンタが前記導光板に前記反射印刷を形成して、選択した一種類または複数種類の白インクの組み合わせに対応する色温度を備えた導光板を作成するようにしたことを特徴とする。
　また本発明は、前記導光板の発光面の色温度を決定する複数種類の各白インクは、それぞれのインク中の酸化チタンの粒子径の分布が異なっていることを特徴とする。
　また本発明は、前記導光板の発光面の色温度を決定する複数種類の各白インクは、それぞれのインク中の酸化チタンの含有量の割合が異なっていることを特徴とする。
　また本発明は、インクジェットプリンタと、光反射パターンの印字データを作成するための画像作成ソフトが格納されたコンピュータとを備え、光反射パターンの印字データをインクジェットプリンタに転送し、該インクジェットプリンタによって導光板の印刷面に、光源から導光板の内部に出射された光を乱射させるための反射印刷を酸化チタンを含む白インクを使用して施し、導光板を作成する装置であって、コンピュータの印字データ作成編集画面上に予め用意した基準用輝度分布パターン図を並べて或いは重ねて表示して、該基準用輝度分布パターン図を参照して前記印字データを作成できるようにし、前記反射印刷を行うための印字データを、前記導光板の四方向の縁部に対応する四方向の縁部からそれぞれ対向する縁部の前方に位置して設定された高濃度設定ポイントに向けて印字の濃度が高くなるようにし、導光板の輝度分布パターンを測定した結果が前記基準用輝度分布パターン図に近似するようにしたことを特徴とする。 In order to achieve the above-described problems, the present invention creates print data for light reflection used for a light guide plate by image creation software stored in a computer, transfers the created print data to an inkjet printer, A method of creating a light guide plate for a liquid crystal TV by performing reflection printing on a printing surface of a light guide plate with white ink on a printing surface of the light guide plate by using a printer to scatter light emitted from the light source into the light guide plate. A process of creating a luminance distribution pattern diagram for a liquid crystal TV light guide plate in advance, a process of creating print data for light reflection by image software with reference to the reference luminance distribution pattern diagram, and inkjet printing the print data A process for converting the print data to a discharge format and a process for printing the print data on the printing surface of the light guide plate by an inkjet printer. Characterized by comprising and.
Further, according to the present invention, the process of creating the print data displays a reference luminance distribution pattern diagram side by side with a print data creation edit area on a computer screen, or displays a reference luminance distribution pattern diagram in the print data creation edit area. It is characterized by being displayed overlaid.
The present invention also includes a process of mounting a printed light guide plate on an LED lighting stand and measuring the luminance of the light emitting surface of the light guide plate to create a luminance distribution pattern diagram, the measured luminance distribution pattern, and the reference And a process of comparing the luminance distribution patterns and determining the quality of the print data.
The present invention is also characterized in that the reference luminance distribution pattern diagram and the measured luminance distribution pattern diagram express the luminance in color.
In the invention, it is preferable that the print data is composed of a gradation pattern.
Further, the present invention is characterized in that the dot diameter or print pattern of the print data corresponds to the thinness of the TV liquid crystal panel so that the dots on the printing surface of the light guide plate are not reflected on the liquid crystal panel.
In the invention, it is preferable that the content ratio of titanium oxide in the white ink is 10% or less.
Further, the present invention is characterized in that copper phthalocyanine is added to the white ink.
According to the present invention, the ink jet printer is provided with a white ink supply unit that stores a plurality of types of white ink for determining the color temperature of the light emitting surface of the light guide plate in an ink tank for each type. A recording head is provided, and one of the ink tanks is connected to each recording head so that each recording head can eject different types of white ink, and the ink jet printer is connected to the light guide plate. The reflection printing is formed, and a light guide plate having a color temperature corresponding to a selected combination of one type or a plurality of types of white ink is created.
The present invention is also characterized in that the plurality of types of white inks that determine the color temperature of the light emitting surface of the light guide plate have different particle size distributions of titanium oxide in the respective inks.
The present invention is also characterized in that the plurality of types of white inks that determine the color temperature of the light emitting surface of the light guide plate have different proportions of titanium oxide content in the respective inks.
The present invention also includes an inkjet printer and a computer storing image creation software for creating print data of the light reflection pattern. The print data of the light reflection pattern is transferred to the ink jet printer and is guided by the ink jet printer. A device for producing a light guide plate by applying reflection printing for scattering light emitted from a light source to the inside of the light guide plate on a printing surface of the light plate using white ink containing titanium oxide, and printing on a computer To display the reference luminance distribution pattern diagrams prepared in advance on the data creation / edit screen so that the print data can be generated with reference to the reference luminance distribution pattern diagrams and the reflection printing is performed. Print data from the four-direction edges corresponding to the four-direction edges of the light guide plate to the front of the opposite edges, respectively. The print density is increased toward the set high density set point, and the result of measuring the luminance distribution pattern of the light guide plate is approximated to the reference luminance distribution pattern diagram. To do.
　本発明は、液晶ＴＶ用の導光板に求められる輝度分布パターンを備えた液晶ＴＶ用導光板を提供することができる。 The present invention can provide a liquid crystal TV light guide plate having a luminance distribution pattern required for a liquid crystal TV light guide plate.
本発明の説明図である。It is explanatory drawing of this invention. 本発明の説明図である。It is explanatory drawing of this invention. 本発明の説明図である。It is explanatory drawing of this invention. 本装置のブロック説明図である。It is block explanatory drawing of this apparatus. 本発明の説明図である。It is explanatory drawing of this invention. 本発明の説明図である。It is explanatory drawing of this invention. 本発明の説明図である。It is explanatory drawing of this invention. 導光板の説明図である。It is explanatory drawing of a light-guide plate. 導光板の説明図である。It is explanatory drawing of a light-guide plate. 導光板の説明図である。It is explanatory drawing of a light-guide plate. 液晶画面表示装置の一部の説明図である。It is explanatory drawing of a part of liquid crystal screen display apparatus. 導光板の説明図である。It is explanatory drawing of a light-guide plate. 本発明の説明図である。It is explanatory drawing of this invention. 本発明の説明図である。It is explanatory drawing of this invention. 本発明の説明図である。It is explanatory drawing of this invention. 本発明の説明図である。It is explanatory drawing of this invention. 本発明の説明図である。It is explanatory drawing of this invention. 本発明の説明図である。It is explanatory drawing of this invention. 本発明の説明図である。It is explanatory drawing of this invention. 本発明の説明図である。It is explanatory drawing of this invention. 本発明の説明図である。It is explanatory drawing of this invention. 本発明の説明図である。It is explanatory drawing of this invention. 本発明の説明図である。It is explanatory drawing of this invention.
　以下に本発明の構成を添付した図面を参照して、詳細に説明する。
図４及び図６は、インクジェットプリンタ２と該プリンタ２のコントローラに入出力インターフェイスを介して接続するパーソナルコンピュータなどのコンピュータ４とからなる導光板印字装置の概略図を示している。図８に示すように、導光板６は発光面６ａに対して裏側の印字面６ｂを上にして印字装置のテーブル８上に脱着可能に保持される。 Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings.
4 and 6 are schematic views of a light guide plate printing apparatus including the inkjet printer 2 and a computer 4 such as a personal computer connected to the controller of the printer 2 via an input / output interface. As shown in FIG. 8, the light guide plate 6 is detachably held on the table 8 of the printing apparatus with the printing surface 6b on the back side of the light emitting surface 6a facing up.
導光板６に対する印字（印刷）は、印字装置本体駆動部の制御により、横レール１０が一方向（副走査方向）に設定された印字単位で送られる一方、この横レール１０に沿って、ヘッドキャリッジ駆動部の制御により、インクジェット記録ヘッド１２，１４，１６，１８を備えたヘッドキャリッジ２０が前記横レール１０の搬送方向とは直角な主走査方向に移動して行われる。前記ヘッドキャリッジ２０が主走査方向に移動するとき、記録ヘッド１２～１８のノズルからインクを吐出し、コンピュータ４からインクジェットプリンタ２のコントローラに転送される印字データが、該コントローラに格納されたソフトウエアの制御により、導光板６の印刷面６ｂ上に印字される。尚、文中の印字は印刷と同義である。 Printing (printing) on the light guide plate 6 is performed in units of prints in which the horizontal rail 10 is set in one direction (sub-scanning direction) under the control of the printing apparatus main body drive unit. Under the control of the carriage drive unit, the head carriage 20 including the ink jet recording heads 12, 14, 16, 18 is moved in the main scanning direction perpendicular to the conveying direction of the horizontal rail 10. When the head carriage 20 moves in the main scanning direction, print data that ejects ink from the nozzles of the recording heads 12 to 18 and is transferred from the computer 4 to the controller of the ink jet printer 2 is stored in the controller. Is printed on the printing surface 6b of the light guide plate 6. Note that printing in the sentence is synonymous with printing.
コンピュータ４の記憶装置には、インクジェットプリンタ２のコントローラを制御し、印字を行うための印刷プログラムが格納されている。テーブル８上には、横レール１０が副走査方向に平行移動可能に配置され、該横レール１０にヘッドキャリッジ２０が主走査方向に移動自在に連結している。このヘッドキャリッジ２０には、図７に示すように複数個のインクジェット記録ヘッド１２，１４，１６，１８が保持されている。 The storage device of the computer 4 stores a print program for controlling the controller of the inkjet printer 2 and performing printing. A horizontal rail 10 is arranged on the table 8 so as to be movable in the sub-scanning direction, and a head carriage 20 is connected to the horizontal rail 10 so as to be movable in the main scanning direction. The head carriage 20 holds a plurality of ink jet recording heads 12, 14, 16, 18 as shown in FIG.
各記録ヘッド１２，１４，１６，１８は、インクを吐出する多数個のノズルを備えている。各ヘッド１２，１４，１６，１８は、図７に示すように、それぞれプリンタ２の機体に配設されたインクタンクを備えた白インク供給部Ａ，Ｂ，Ｃ，Ｄの対応するインクタンク２２，２４，２６，２８にチューブなどのインク供給手段を介して連通している。複数個の記録ヘッド１２，１４，１６，１８は、横レール１０に沿った主走査方向に互いの印字領域が重なるように並列配置されている。 Each recording head 12, 14, 16, 18 includes a large number of nozzles that eject ink. As shown in FIG. 7, each head 12, 14, 16, 18 has an ink tank 22 corresponding to each of the white ink supply units A, B, C, D provided with an ink tank disposed in the body of the printer 2. , 24, 26, and 28 via an ink supply means such as a tube. The plurality of recording heads 12, 14, 16, 18 are arranged in parallel so that their print areas overlap in the main scanning direction along the horizontal rail 10.
コンピュータ４の記憶装置には、光反射パターンの印字データ作成用のソフトウエア（印字プログラム）が格納されるとともに、インクデータテーブル３０が設けられている。このデータテーブル３０は、複数種類揃えた白インクＡ，Ｂ，Ｃ，Ｄを、個々または組み合わせて導光板６に印字を行うことにより、多種の色温度の導光板の作成ができるようにするために、色温度とインクＡ，Ｂ，Ｃ，Ｄとの組み合わせを予め設定したものであり、このデータテーブル３０を使用することにより、簡単に多種の色温度の導光板を作成することができるものである。 The storage device of the computer 4 stores software (print program) for creating print data of the light reflection pattern, and an ink data table 30 is provided. This data table 30 is used to create light guide plates with various color temperatures by printing a plurality of types of white inks A, B, C, and D individually or in combination on the light guide plate 6. In addition, combinations of color temperatures and inks A, B, C, and D are set in advance. By using this data table 30, light guide plates having various color temperatures can be easily created. It is.
図５において、白インクＡ，Ｂは、酸化チタンの粒子径に関して、インクの色温度の違う２種類のインクを示し、白インクＣは、白インクＡとはその中の酸化チタンの含有量が違う白インクを示し、白インクＤは、白インクＢとはその中の酸化チタンの含有量が違う白インクを示している。本実施形態では、酸化チタンの粒子径と含有量に関して複数種類の白インクを用意することで、簡単に複数の色温度での印字または、これらを組み合わせての印字を可能としている。白インク中の酸化チタンの含有量は、１０％以下が望ましく、酸化チタンの含有量を下げることで、導光板の発光面の微細なグラデーションの輝度の変化をコントロールし易くなることが実験的に確認されている。 In FIG. 5, white inks A and B indicate two types of inks having different color temperatures with respect to the particle diameter of titanium oxide, and white ink C has a content of titanium oxide in white ink A. A different white ink is shown, and a white ink D is a white ink having a titanium oxide content different from that of the white ink B. In this embodiment, by preparing a plurality of types of white ink with respect to the particle size and content of titanium oxide, printing at a plurality of color temperatures or a combination of these can be easily performed. The content of titanium oxide in the white ink is desirably 10% or less, and experimentally it is easy to control the fine gradation brightness change of the light-emitting surface of the light guide plate by lowering the titanium oxide content. It has been confirmed.
コンピュータ４に格納された印字制御用の印刷プログラムは、インクデータテーブル３０の作成、修正などを行うことができるように構成されている。作成された導光板６は、透明なアクリル板などの導光板の印刷面６ｂの平面部分に反射ドットまたは、反射グラデーション（曇りガラスのような細かいドット）を印字したものであり、図８～図１１に示すように、矩形の導光板６の上部の縁部３２の厚み部分に冷陰極管やＬＥＤなどの発光体から成る光源４０を配置することにより、発光面６ａの平面全体が発光しているように見せるものである。 The printing program for printing control stored in the computer 4 is configured so that the ink data table 30 can be created and corrected. The produced light guide plate 6 is obtained by printing reflection dots or reflection gradation (fine dots such as frosted glass) on the plane portion of the printing surface 6b of the light guide plate such as a transparent acrylic plate. 11, by arranging a light source 40 made of a light emitter such as a cold-cathode tube or an LED in the thickness portion of the upper edge 32 of the rectangular light guide plate 6, the entire plane of the light emitting surface 6 a emits light. It looks like you are.
光源３２から導光板６に出射された光は、導光板６の縁部３２から内部に入り、矢印で示されるように、内部で反射して導光板６全体に拡散する。光は上に抜けるものやあるいは、インク４２を抜けるものや、反射板４４から戻るもの、導光板６の縁部３４，３６，３８で反射するもの等があり、導光板６全体に拡散する。酸化チタンを用いたインクを使用する場合には、インク中の酸化チタンの粒子径の分布により、色温度の違う白インクを用意し、粒子径の分布のばらつきを変更すると、反射光に差が出て色温度に差が出る。これはインク中の酸化チタンの粒子径が異なるために印刷後、散乱する光の強度が光りの波長により異なり、結果、印刷された導光板の散乱光の色温度が異なるようになる。 The light emitted from the light source 32 to the light guide plate 6 enters the inside from the edge portion 32 of the light guide plate 6, is reflected inside and diffuses throughout the light guide plate 6 as indicated by arrows. There are light that escapes upward, light that passes through the ink 42, light that returns from the reflection plate 44, light that is reflected by the edge portions 34, 36, and 38 of the light guide plate 6, and the light diffuses throughout the light guide plate 6. When using titanium oxide ink, prepare white ink with different color temperature depending on the particle size distribution of titanium oxide in the ink, and if the dispersion of the particle size distribution is changed, there will be a difference in reflected light. There is a difference in color temperature. This is because the particle diameter of titanium oxide in the ink is different, so that the intensity of light scattered after printing differs depending on the wavelength of light, and as a result, the color temperature of the scattered light of the printed light guide plate is different.
［白インクと色温度について］
白インクは酸化チタンをインクの顔料としている。酸化チタンの粒子は粒子径の２倍の波長の光をもっとも強く反射する性質があり、白インクとしての理想は酸化チタンの粒子径の分布が、図１９に示すように、２００ｎｍ－４００ｎｍで均一に存在することである。その場合、粒子径２００ｎｍ－４００ｎｍの２倍の波長の光４００ｎｍ－８００ｎｍ（可視光）を均一に反射する白色になる。 [About white ink and color temperature]
White ink uses titanium oxide as an ink pigment. Titanium oxide particles have the property of reflecting light with a wavelength twice as large as the particle diameter, and as an ideal white ink, the distribution of titanium oxide particle diameter is uniform between 200 nm and 400 nm as shown in FIG. Is to exist. In this case, the color becomes white which uniformly reflects light 400 nm to 800 nm (visible light) having a wavelength twice as large as the particle diameter 200 nm to 400 nm.
しかし実際の白インクでは、粒子径の分布が、２００ｎｍ－４００ｎｍで均一に存在することは稀であり、
（１）粒子径２００ｎｍに多く存在する場合（図２０参照）、４００ｎｍの光（短波長）を強く反射する白インク、色温度が高く青みがかった白色のインクになる。
（２）粒子径４００ｎｍに多く存在する場合（図２１参照）、８００ｎｍの光（長波長）を強く反射する白インク、色温度が低く赤くまたは、黄、緑色かかった白インクになる。 However, in actual white ink, the particle size distribution rarely exists uniformly at 200 nm-400 nm,
(1) When there are many particles having a particle diameter of 200 nm (see FIG. 20), white ink that strongly reflects 400 nm light (short wavelength), and white ink with a high color temperature and bluish are obtained.
(2) When there are many particles having a particle diameter of 400 nm (see FIG. 21), white ink that strongly reflects light (long wavelength) at 800 nm, white ink with a low color temperature, red, yellow, or green is obtained.
色温度の調整においては、これらの色温度の異なる（酸化チタンの粒子径の分布が異なる）白インクの組み合わせによって、所望の色温度＝所望の酸化チタン粒子径分布＝所望の光の波長域、の導光板を作成する。しかしながら、酸化チタンの粒子径のみでの色温度の調整が難しい場合は、その他の粒子、銅フタロシアニンなどを加えることによりあるいは酸化チタンの含有量の割合を変えることで所望の光の波長域を得ることもある。
　上記実施形態では、導光板の色温度の調整において、酸化チタンの粒子径の分布が異なるあるいは酸化チタンの含有量の割合が異なる複数種類の白インクを用意し、これらを組み合わせて使用しているが、この実施形態に特に限定されるものではなく、プリンターが１種類の白インクのみを備え、予め、そのインク中の酸化チタンの粒子径の分布状態を所望の分布状態に調整し、あるいは酸化チタンの含有量の割合を調整し、この調整した白インクを用いて導光板に印字を行うようにしても良い。
　またプリンターが１種類の白インクのみを備え、予め、そのインク中の酸化チタンの分布状態を所望の分布状態に調整し、この調整した白インクを用いて導光板に印字を行うようにしたものを複数台用意し、プリンターごとに違う種類の白インクを用いて必要に応じてその中の一つを指定して所望の色温度の導光板を作成するようにしても良い。 In the adjustment of the color temperature, a desired color temperature = desired titanium oxide particle size distribution = desired wavelength range of light by a combination of white inks having different color temperatures (different distributions of titanium oxide particle sizes). Create a light guide plate. However, when it is difficult to adjust the color temperature with only the particle diameter of titanium oxide, the desired wavelength range of light can be obtained by adding other particles, copper phthalocyanine, or by changing the content ratio of titanium oxide. Sometimes.
In the above embodiment, in adjusting the color temperature of the light guide plate, a plurality of types of white inks having different titanium oxide particle diameter distributions or different titanium oxide content ratios are prepared and used in combination. However, the embodiment is not particularly limited, and the printer includes only one type of white ink, and the particle diameter distribution state of titanium oxide in the ink is adjusted in advance to a desired distribution state or oxidized. The ratio of the titanium content may be adjusted and printing may be performed on the light guide plate using the adjusted white ink.
In addition, the printer has only one type of white ink, and the distribution state of titanium oxide in the ink is adjusted in advance to a desired distribution state, and printing is performed on the light guide plate using the adjusted white ink. May be prepared, and different types of white ink may be used for each printer, and one of them may be designated as necessary to create a light guide plate having a desired color temperature.
図１９－図２１はインク中の酸化チタンの粒子径の分布イメージ図であり、横軸は粒径を示し、縦軸は分布の度合いを示している。図１９は、理想的な白インク中の酸化チタン粒子の粒子径分布を示し、図２０－図２１は、実際の白インク中の酸化チタン粒子の粒子径の分布を示している。 FIGS. 19 to 21 are distribution image diagrams of the particle diameter of titanium oxide in the ink. The horizontal axis represents the particle diameter, and the vertical axis represents the degree of distribution. FIG. 19 shows an ideal particle size distribution of titanium oxide particles in white ink, and FIGS. 20 to 21 show an actual particle size distribution of titanium oxide particles in white ink.
本実施形態で使用されるインクには、銅フタロシアニンが微量に添加されている。この添加の量は、実験的に適量を選択することでインクの色温度のコントロールが容易となる実験結果を得ている。導光板６への印字に際し、操作者は、コンピュータ４のディスプレイ４６に表示されるインク選択ボタン４８をマウスなどによりヒットすることで、白インクＡ，Ｂ，Ｃ，Ｄの選択を行うことができ、また、混合ボタン５０を操作することで、白インクを所望の組み合わせて混合させることができるように構成されている。またＡとＢ、ＡとＣなどのインクを複数個指定する事もでき、作成された印字データとの対応関係で、どの印字部分で何のインクを使用するかの指定もできるようにしてある。 A small amount of copper phthalocyanine is added to the ink used in this embodiment. The amount of this addition has been experimentally selected so that the color temperature of the ink can be easily controlled by selecting an appropriate amount experimentally. When printing on the light guide plate 6, the operator can select the white ink A, B, C, D by hitting the ink selection button 48 displayed on the display 46 of the computer 4 with a mouse or the like. In addition, by operating the mixing button 50, the white ink can be mixed in a desired combination. It is also possible to specify a plurality of inks such as A and B, A and C, and to specify what ink is to be used in which print portion in correspondence with the created print data. .
図１３は、導光板の反射パターンを作成するための印字データ作成ソフトウエアを用いてコンピュータ上に作成された反射面用印字データ５６を示している。導光板の矩形形状に応じて矩形の領域内に生成された印字データ５６は、その矩形領域内に設定した高濃度設定ポイントに向かって印字濃度（密度）が濃くなるように形成されている。導光板の反射パターンの印字であるため、全体への印字はされているものであり、その中での印字濃度のグラデーションの方向を示している。尚、図１３は一例でありとくに形状などはこれに限定されているものではない。 FIG. 13 shows reflective surface print data 56 created on a computer using print data creation software for creating a reflection pattern of the light guide plate. The print data 56 generated in the rectangular area according to the rectangular shape of the light guide plate is formed so that the print density (density) increases toward the high density setting point set in the rectangular area. Since the reflection pattern is printed on the light guide plate, printing is performed on the whole, and the gradation direction of the print density in the print is shown. FIG. 13 is an example, and the shape and the like are not particularly limited thereto.
図２３は、印字データ６６の印字濃度（印字密度）の具体的なイメージを立体的にし、図中、符号Ｐは、高濃度設定ポイントを示している。この高濃度設定ポイントは、一点に特に限定されるものではなく、図１３中、四方向にある程度の広がり（スペース）を有するようにしてもよい。尚、図２３中、数字１は光源方向を示し、数字１～７は印字データ５６の光源側縁部６０とこれと対向する反対側の縁部６２間を７等分したことを示している。また、Ｓ１，Ｓ３，Ｓ５は、左右の縁部６４，６６間の目盛りを示している。 FIG. 23 shows a three-dimensional image of the print density (print density) of the print data 66. In the figure, the symbol P indicates a high density set point. The high density setting point is not particularly limited to one point, and may have a certain extent (space) in four directions in FIG. In FIG. 23, numeral 1 indicates the direction of the light source, and numerals 1 to 7 indicate that the distance between the light source side edge 60 and the opposite edge 62 facing the print data 56 is divided into seven equal parts. . S1, S3 and S5 indicate the scale between the left and right edge portions 64 and 66.
矩形領域内の下部中央付近に高濃度設定ポイントＰが設定されており、このポイントに印字密度の濃い部分が集まるようにしたのは、光源からの部分は遠くなるほど反射率などを上げる必要が出てくるからであるが、その他の周端部に関しては端部から戻ってくる反射の影響を受ける部分もあるため（図１０参照)、その部分を考慮して印字パターンのデータを作成しても良い。 The high density setting point P is set near the lower center of the rectangular area, and the part with the high print density is gathered at this point. It is necessary to increase the reflectivity as the distance from the light source increases. This is because there is a part affected by reflection returning from the other peripheral end part (refer to FIG. 10), so even if the print pattern data is created in consideration of that part. good.
印字データ５６は、グラデーションパターンにより作成されている。ここでグラデーションとは、印字データ作成ソフトのグラデーションパターン生成モードにより形成される印字濃度変化パターンのことを言う。グラデーションパターンの作図において、印字密度は、０％から１００％の間で変化させることができる。図１４は、グラデーションパターン図における濃度の説明図であり、図１４中（Ａ）は０％、（Ｂ）は２５％、（Ｃ）は５０％、（Ｄは）は７５％、（Ｅ）は１００％の濃度をそれぞれ示している。なお図１４は単に簡略して説明をしただけのものであり、実際の印字では多数のドットにて印字がされるものであるためプリンタの解像度により印字される場所に関しての指定がされ、その範囲内で０～１００％などの任意の範囲での印字が可能である。 The print data 56 is created with a gradation pattern. Here, gradation refers to a print density change pattern formed by the gradation pattern generation mode of the print data creation software. In drawing a gradation pattern, the print density can be changed between 0% and 100%. FIG. 14 is an explanatory diagram of the density in the gradation pattern diagram. In FIG. 14, (A) is 0%, (B) is 25%, (C) is 50%, (D) is 75%, and (E). Indicates 100% concentration. Note that FIG. 14 is merely a simplified description. In actual printing, printing is performed with a large number of dots, and therefore, the printing place is designated according to the resolution of the printer, and its range. Printing within an arbitrary range such as 0 to 100% is possible.
印字データ５６において、第１の濃度変化部は、印字データ５６の光源配置側縁部６０から、印字領域に設定した高濃度設定ポイントに対して印字濃度を薄い状態から、グラデーションパターンが形成されるように、最も濃い状態に変化させて形成する。矢印ａは第１の濃度変化部において、濃度が薄い状態から矢印の方向即ち高濃度設定ポイントに向かって濃くなる様子を示している。
第２の濃度変化部は、光源配置側縁部６０とは反対側の縁部６２から、比較的短い範囲で、印字領域の高濃度設定ポイントに向かって印字濃度を薄い状態から、グラデーションが形成されるように、最も濃い状態になるまで変化させて形成する。 In the print data 56, the first density changing portion forms a gradation pattern from the light source arrangement side edge 60 of the print data 56 in a state where the print density is low with respect to the high density set point set in the print area. As shown in FIG. An arrow a indicates a state in the first density changing portion where the density increases from a low density state toward the arrow direction, that is, toward the high density setting point.
In the second density change portion, gradation is formed from a state in which the print density is reduced toward the high density set point in the print area within a relatively short range from the edge 62 on the side opposite to the light source arrangement side edge 60. As shown, it is formed by changing it until it becomes the darkest state.
矢印ｂは、第２の濃度変化部において、濃度が薄い状態から矢印の方向即ち高濃度設定ポイントに向かって濃くなる様子を示している。左右両側の縁部６４，６６からも、比較的短い範囲で印字領域の高濃度設定ポイントに向かって印字濃度を薄い状態からなだらかにグラデーションパターンが形成されるように最も濃い状態になるまで変化させて、第３濃度変化部と第４濃度変化部を形成する。矢印ｃは第３濃度変化部において、濃度が薄い状態から矢印の方向に濃くなる様子を示し、矢印ｄは第４濃度変化部において濃度が薄い状態から矢印の方向に濃くなる様子を示している。 An arrow b indicates a state in the second density changing portion where the density increases from a low density state toward the arrow direction, that is, toward the high density setting point. From both the left and right edge portions 64 and 66, the print density is changed from a light state to a darkest state so that a gradation pattern is gradually formed toward a high density set point in the print region within a relatively short range. Thus, the third density changing portion and the fourth density changing portion are formed. An arrow c indicates a state in which the density is increased from a light state in the direction of the arrow in the third density changing part, and an arrow d indicates a state in which the density is increased in the direction of the arrow from a light state in the fourth density changing part. .
印字データ５６は、予め作成した導光板の理想的基準用輝度分布パターン図５７（第３図参照）を参照して設計する。この基準用輝度分布パターン図５７のエリアａは輝度１０００～１５００（単位カンデラ/平方メートル以下同じ）、エリアｂは輝度１５００～２５００、エリアｃは輝度２５００～３５００、エリアｄは３５００～４０００、エリアｅは輝度４５００～であり、輝度がカラー（色）によって表示されている。各エリアは導光板の発光面６ａに対応している。第３図に示す理想的基準用輝度分布パターン図５７は一例であり、作成する導光板の種類等によって導光板に適した種々の理想的基準用輝度分布パターン図が想定される。理想的基準用輝度分布パターンはデータベースとして幾つかを用意しておき、必要なものをその時々で選択できるようにしておくと良い。なおそのパターン毎の印字データサンプルなども用意しておけばその後の作業性も向上する。
第１６図は、本実施形態における、作成した導光板を使用してＬＥＤなどを点灯させた場合に発光する照明の測定値から得られる輝度分布パターン図３９を示し、基準となる輝度分布パターン図５７と略一致させている。該輝度分布パターン図３９において、エリアａは輝度１０００～１５００（単位カンデラ/平方メートル以下同じ）、エリアｂは輝度１５００～２５００、エリアｃは輝度２５００～３５００、エリアｄは３５００～４０００、エリアｅは輝度４５００～の各領域を示し、各エリアは輝度に応じたカラーで表示されている。また各エリアは導光板の発光面６ａに対応し、第１６図中の符号３２，３４，３６は導光板の縁部３２，３４，３６と対応する部分を同一の番号で表示し、対応関係を示している。 The print data 56 is designed with reference to the ideal reference luminance distribution pattern diagram 57 (see FIG. 3) of the light guide plate prepared in advance. In the reference luminance distribution pattern FIG. 57, area a has a luminance of 1000 to 1500 (unit candela per square meter), area b has a luminance of 1500 to 2500, area c has a luminance of 2500 to 3500, area d has a luminance of 3500 to 4000, area e Has a luminance of 4500-, and the luminance is displayed in color. Each area corresponds to the light emitting surface 6a of the light guide plate. The ideal reference luminance distribution pattern diagram 57 shown in FIG. 3 is an example, and various ideal reference luminance distribution pattern diagrams suitable for the light guide plate are assumed depending on the type of the light guide plate to be created. It is preferable to prepare several ideal reference luminance distribution patterns as a database so that necessary ones can be selected from time to time. If a print data sample for each pattern is prepared, the workability after that can be improved.
FIG. 16 shows a luminance distribution pattern diagram 39 obtained from measured values of illumination emitted when an LED or the like is turned on using the prepared light guide plate in this embodiment, and is a reference luminance distribution pattern diagram. 57. In the luminance distribution pattern diagram 39, area a has a luminance of 1000 to 1500 (unit candela per square meter or less), area b has a luminance of 1500 to 2500, area c has a luminance of 2500 to 3500, area d has a luminance of 3500 to 4000, and area e has an area e of Each area of luminance 4500 is shown, and each area is displayed in a color corresponding to the luminance. Further, each area corresponds to the light emitting surface 6a of the light guide plate, and reference numerals 32, 34, and 36 in FIG. 16 indicate portions corresponding to the edges 32, 34, and 36 of the light guide plate with the same numbers, and the correspondence relationship. Is shown.
図２２は、ドット密度と輝度との関連を示すグラフであり、図中、Ｘは、光源方向を示し、各横軸は光源からの距離を示している。高濃度設定ポイントは、左右縁部間のほぼ中央で且つ光源配置側縁部６０とその反対側の縁部６２との間の距離を１とすると、縁部６０から距離１／２を越え1に満たない任意の位置（即ち縁部６２の前方）に設定され、本実施形態では７等分をした場合に縁部６０から６／７程度の位置に高濃度の部分のピークがきているが、この位置は使用をする導光板の材質、厚さ、インクの種類、光源の輝度などにより前後する。例えば導光板の厚さが薄くなった場合には、縁部６２から１／４、１／３などと中央付近に近づけた方が良い結果が出ていたりする。 FIG. 22 is a graph showing the relationship between dot density and luminance. In the figure, X indicates the light source direction, and each horizontal axis indicates the distance from the light source. The high density setting point is approximately in the middle between the left and right edges, and when the distance between the light source arrangement side edge 60 and the opposite edge 62 is 1, the distance from the edge 60 exceeds 1/2. Is set at an arbitrary position less than (that is, in front of the edge 62). In this embodiment, when the image is divided into seven equal parts, a peak of a high-density portion appears at a position about 6/7 from the edge 60. The position depends on the material of the light guide plate used, the thickness, the type of ink, the brightness of the light source, and the like. For example, when the thickness of the light guide plate is reduced, a better result may be obtained by bringing the edge 62 closer to the center, such as 1/4 or 1/3.
また印字濃度の変化させる大きさも条件により変更させると良い。今回は高濃度部分の先端部分即ち高濃度設定ポイントＰに向かって印字濃度の変化をさせているのだが、その部分は必ずしも図２３に示すように、先端状態である必要はなく、ある一定レベル以上の平坦な領域に向かって変化をさせるようにしても良い。
なお、上下の縁部６０，６２に光源が配置される印字の場合には、高濃度設定ポイントＰは、左右縁部間のほぼ中央で且つ縁部６０とその反対側の縁部６２との間の距離を１とすると、縁部６２から略１／２の距離に設定されることが望ましい。 Also, the magnitude of the change in print density may be changed according to the conditions. In this example, the print density is changed toward the leading end portion of the high density portion, that is, the high density setting point P, but the portion does not necessarily have to be in the leading end state as shown in FIG. You may make it change toward the above flat area | region.
In the case of printing in which the light sources are arranged on the upper and lower edges 60 and 62, the high density setting point P is approximately at the center between the left and right edges and between the edge 60 and the opposite edge 62. If the distance between them is 1, it is desirable to set the distance from the edge 62 to approximately ½.
図３に示す、理想的な輝度分布パターンになるように印字データの印刷が施された導光板６を、図１１に示すように、プリズムシート６８、拡散板７０、反射板４４を備えた液晶テレビや液晶モニターなどの液晶表示装置に用いると、中心の輝度が高く、端部になると少し輝度が低くなる人間の視覚に適合した最適な面発光装置を得ることができる。ソフトウエアで作成した反射用印字データを５６を、導光板６に印字する場合には、操作者は、使用するインクの種類又はインクの混合条件を選択して、これらをコンピュータ４に入力し印刷ボタンをクリックする。 A light guide plate 6 on which print data is printed so as to have an ideal luminance distribution pattern shown in FIG. 3, and a liquid crystal including a prism sheet 68, a diffusion plate 70, and a reflection plate 44 as shown in FIG. When used in a liquid crystal display device such as a television or a liquid crystal monitor, it is possible to obtain an optimal surface light emitting device suitable for human vision, which has high luminance at the center and slightly lower luminance at the end. When printing the reflection print data 56 created by software on the light guide plate 6, the operator selects the type of ink to be used or the ink mixing conditions and inputs them to the computer 4 for printing. Click the button.
これによりコンピュータ４からプリンタ２に印字データが転送され、その後、プリンタ２にてデータの処理がされた後に、横レール１０が副走査方向に設定がされた印字幅単位で搬送がされ搬送され、ヘッドキャリッジ２０が主走査方向に駆動されて導光板６に、選択された印字条件の白インクにて印字が実行される。本実施形態では、図１８示すようにインクドット５４の厚さＨは、０，５μｍ程度であり、スクリーン印刷（１００μｍ程度）に比べて非常に薄い。 As a result, the print data is transferred from the computer 4 to the printer 2, and after the data is processed by the printer 2, the horizontal rail 10 is conveyed and conveyed in the print width unit set in the sub-scanning direction, The head carriage 20 is driven in the main scanning direction, and printing is performed on the light guide plate 6 with white ink under the selected printing condition. In this embodiment, as shown in FIG. 18, the thickness H of the ink dots 54 is about 0.5 μm, which is much thinner than screen printing (about 100 μm).
これにより、白インクのドットから反射する光とそのインクを透過して反射板７２から反射してくる光との相乗効果で従来のものより明るい導光板６を得ることができる。印字に使用する白インクは微細なグラデーション印字による輝度のコントロールをし易くするために酸化チタンの含有量を調整している。酸化チタンの含有量を変更することにより、その分反射する量が変更されるので細かい変化に対応でき、それにより光の反射量や散乱量のコントロールを容易にしている。 Thereby, the light guide plate 6 brighter than the conventional one can be obtained by the synergistic effect of the light reflected from the white ink dots and the light transmitted through the ink and reflected from the reflection plate 72. In the white ink used for printing, the content of titanium oxide is adjusted so that the brightness can be easily controlled by fine gradation printing. By changing the content of titanium oxide, the amount of reflection is changed accordingly, so that it is possible to cope with fine changes, thereby facilitating control of the amount of reflected light and the amount of scattering.
微妙なこれらのコントロールをするには白インクの酸化チタンの含有量が１０％以下が望ましく、また本件ではさらに細かいコントロールをするために１％程度の含有量の白インクも用意し、個々の白インクや複数の白インクを組み合わせての使用により微細なグラデーションでの印字による輝度のコントロールを実現している。
　また複数のインク吐出用の印字波形や駆動電圧を利用してインク吐出量を制御しインクドット径の変更ができるインクジェットプリンタにおいては複数の解像度への対応ができるので、例えば解像度１４４０ｄｐｉを埋めるのに必要な２５μｍ程度のドット径で印字を行えば微細なグラデーションによる輝度のコントロールが容易となり、また３６０ｄｐｉを埋めるのに必要な１００μｍ程度のドット径を使用すれば印字速度を上げることもできる。 In order to perform these subtle controls, it is desirable that the content of titanium oxide in the white ink is 10% or less. In this case, white ink with a content of about 1% is also prepared for finer control. By using a combination of ink and multiple white inks, brightness control is achieved by printing with fine gradation.
Ink jet printers that can change the ink dot diameter by controlling the ink discharge amount using a plurality of print waveforms and drive voltages for ink discharge can cope with a plurality of resolutions. For example, to fill a resolution of 1440 dpi If printing is performed with the required dot diameter of about 25 μm, the brightness can be easily controlled by fine gradation, and if the dot diameter of about 100 μm necessary for filling 360 dpi is used, the printing speed can be increased.
また７２０ｄｐｉを埋めるのに必要な５０μｍ程度のドット径で印字を行ってもよい。なお実際の印字においてはヘッドが移動しながら印字を行うのでインクドット径は楕円になるため、使用する解像度において狭い幅方向でも埋める事ができるインクドット径であれば良く、埋まらない場合には複数のドット径を組み合わせて印字を行っても良い。
導光板６への印字が完了したところで、印字した導光板６を図６に示すＬＥＤ点灯台７２に装着し、ＬＥＤを点灯させて、カメラ７４で導光板６の発光面を撮影し、発光面の明るさの分布を計測する。使用するＬＥＤなどにより測定結果が違ってくる可能性があるため、ＬＥＤは製品で実際に使用するものか、基準範囲内にあるものを使用する。 Further, printing may be performed with a dot diameter of about 50 μm necessary for filling 720 dpi. In actual printing, printing is performed while the head is moving, so the ink dot diameter is elliptical. Therefore, the ink dot diameter can be filled even in a narrow width direction at the resolution used. Printing may be performed by combining the dot diameters.
When printing on the light guide plate 6 is completed, the printed light guide plate 6 is mounted on the LED lighting stand 72 shown in FIG. 6, the LED is turned on, and the light emitting surface of the light guide plate 6 is photographed with the camera 74. Measure the brightness distribution. Since the measurement results may vary depending on the LED used, use the LED that is actually used in the product or within the reference range.
カメラ７４で測定した輝度データ（輝度がカラーで表示される）を、輝度分布パターン図３９としてコンピュータ４の画面に表示あるいはプリントアウトし、基準となる理想的基準用輝度分布パターン図５７と比較し、印字した導光板６の輝度分布が理想的な輝度分布パターンと一致または近似していれば、コンピュータ上での印字データ作成作業を完了する。このとき満足すべき結果が得られなければ、印字データを修正して、理想的な輝度分布パターンが得られるまで、この作業を繰り返す。例えばカメラ７４で測定した輝度データに基づく図１６に示す輝度分布パターン図３９の輝度分布パターンが、印字作成時に参照した基準用輝度分布パターン図５７に比し、輝度が高い部分が少し下方向にずれていた場合には、図１３で示す印字データにおける対応する部分の印字データの印字濃度を変更したり、印字濃度の濃い部分の位置を少し上方向に修正したりして対応する。またその位置で使用するインクの種類や使用するインクドット径を変更したりする対応も考えられる。 The luminance data measured by the camera 74 (luminance is displayed in color) is displayed or printed out on the screen of the computer 4 as the luminance distribution pattern diagram 39, and compared with the ideal reference luminance distribution pattern diagram 57 as a reference. If the brightness distribution of the printed light guide plate 6 matches or approximates the ideal brightness distribution pattern, the print data creation work on the computer is completed. If satisfactory results are not obtained at this time, this operation is repeated until the print data is corrected and an ideal luminance distribution pattern is obtained. For example, the luminance distribution pattern of the luminance distribution pattern diagram 39 shown in FIG. 16 based on the luminance data measured by the camera 74 is slightly lower in the portion where the luminance is higher than the reference luminance distribution pattern diagram 57 referred to at the time of printing. If there is a deviation, the print density of the corresponding portion of the print data shown in FIG. 13 is changed, or the position of the dark portion is corrected slightly upward. It is also conceivable to change the type of ink used at that position and the ink dot diameter used.
酸化チタンを使用した白インクを用いたインクジェット方式で微細な印字を印字密度を変更させて行う上記実施形態では、いわゆるドットパターン見え現象の起こらない導光板を提供することができる。また、インクの厚さもインクジェット方式では、薄くできるため透過する部分と反射してくる部分の光により、明るい面発光を提供できる。インクは色温度の違う白インクを複数用意しておくことで、簡単に複数の色温度での印字が可能になり、また組み合わせての印字も可能なので細かい色温度コントロールができる。 In the above-described embodiment in which fine printing is performed by changing the print density by an ink jet method using white ink using titanium oxide, a light guide plate that does not cause a so-called dot pattern appearance phenomenon can be provided. Further, since the ink thickness can be reduced in the ink jet system, bright surface emission can be provided by the light of the transmitting part and the reflecting part. By preparing multiple white inks with different color temperatures, it is possible to easily print at multiple color temperatures and to print in combination, so fine color temperature control is possible.
酸化チタンの含有量を少なくしている場合には、光の反射量の微細な変更を簡単に制御でき、また酸化チタンの含有量を変更させた白インクを複数設けても良く、また小さなドット径を使用して印字をする場合には更に細かい制御も可能になる。
本装置で作成した導光板を液晶表示装置などに使用した場合に使用者の条件に合えば拡散板などを無くす事も可能になるため、構造を減らすことでの薄型化も可能になる。またコスト的にも部品点数が削減できる。 When the content of titanium oxide is low, fine changes in the amount of reflected light can be easily controlled, and multiple white inks with a modified content of titanium oxide can be provided. When printing is performed using the diameter, finer control becomes possible.
When the light guide plate created by this apparatus is used for a liquid crystal display device or the like, it is possible to eliminate the diffusion plate or the like if the user's conditions are met. Therefore, the thickness can be reduced by reducing the structure. Also, the number of parts can be reduced in terms of cost.
上記実施形態では、導光板６の片方の縁部３２に光源４０を配置しているが、図１２に示すように、両方の縁部３２，３４に光源４０，４０を配置しても良く、１つの光源を設けることに特に限定されるものではない。両方の端部に光源を設けた場合には輝度分布も変わるってくるためそれに合わせた印字パターンが必要になりデータ的には印字密度の高い部分が中心方向に移動する。なお光源の輝度にバラつきがあってもその部分を印字パターンでの修正により所望の輝度分布を得る事ができ、両端部での光源の差も対応する事が出来る。
なお本件は説明のために媒体を固定してインクジェットヘッドが移動する装置で説明をしているがそれに限定されるものでなく、媒体が移動して印字を行う装置やラインヘッドを使用して印字をおこなうものなど、インクジェット方式で印字ができるものであればよい。 In the above embodiment, the light source 40 is arranged on one edge 32 of the light guide plate 6, but as shown in FIG. 12, the light sources 40, 40 may be arranged on both edges 32, 34. There is no particular limitation on providing one light source. When the light sources are provided at both ends, the luminance distribution also changes, so a print pattern corresponding to the light distribution is required, and a portion having a high print density moves in the center direction in terms of data. Even if the luminance of the light source varies, a desired luminance distribution can be obtained by correcting the portion with the print pattern, and the difference between the light sources at both ends can be dealt with.
In this case, for the sake of explanation, the medium is fixed and the apparatus in which the inkjet head moves is described. However, the present invention is not limited to this, and printing is performed using an apparatus or a line head that performs printing by moving the medium. Any device that can perform printing by an ink jet method, such as a device that performs printing.
またインクジェットプリンタでは製品の仕様によっては複数の解像度を使用する事ができるので、（例えば１８０～１４４０ｄｐｉなどの必要な印字モードを選択して使用）必要に応じて解像度を選択するようにしても良い。
次に図１を参照して、導光板作成のプロセスについて説明する。
まず、予め作成したＴＶ導光板用の基準用輝度分布パターン図５７（図３参照）を参照して、画像（印字）作成ソフトを用い、印刷用画像パターン（印字データ）５６を作成する。 In addition, since the inkjet printer can use a plurality of resolutions depending on the product specifications (for example, select and use a necessary print mode such as 180 to 1440 dpi), the resolution may be selected as necessary. .
Next, with reference to FIG. 1, the process of creating the light guide plate will be described.
First, with reference to a reference luminance distribution pattern diagram for TV light guide plate created in advance (see FIG. 3), an image (print) creation software is used to create a print image pattern (print data) 56.
この基準用輝度分布パターン図５７は、テレビ画面を見たとき、最適の視覚効果が得られるように人間の視覚の特性を考慮して実験的データに基づき作成されたものであり、中央部において輝度が高いものや、その他独特の輝度分布パターンを有している。この輝度分布パターン図は、輝度の大きさがカラー（色）で示される。 The reference luminance distribution pattern diagram 57 is created based on experimental data in consideration of human visual characteristics so that an optimal visual effect can be obtained when watching a television screen. It has high brightness and other unique brightness distribution patterns. In this luminance distribution pattern diagram, the magnitude of luminance is indicated by color (color).
印字データ作成に際し、基準用輝度分布パターン図５７を参照する方法としては、図２に示すように、画像作成ソフトに付加した複数画像表示機能や画像重ね合わせ表示機能を用いて、コンピュータ４の、印刷用画像パターン５６作成画面４ａのエリアＡに印字データ５６を表示し、エリアＢに印字データ５６と並んで基準輝度分布パターン図５７を表示したり、あるいはエリアＤに印字パターン５６と基準輝度パターン図５７を重ね合わせて表示し、操作者はこの画面に表示された基準用輝度分布パターン図５７を参照して、これと対応する濃度パターンが形成されるようにグラデーションモードを利用して印刷用画像パターン５６即ち、印字データ５６を作成する（ステップ１）。印字データ作成に使用されるコンピュータがインクジェットプリンタ２に接続するコンピュータ４でない場合は、作成された印字データはコンピュータ４に転送されコンピュータ４に格納される。 As a method of referring to the reference luminance distribution pattern FIG. 57 when creating the print data, as shown in FIG. 2, using the multiple image display function and the image overlay display function added to the image creation software, Print data 56 is displayed in area A of print image pattern 56 creation screen 4a and reference luminance distribution pattern diagram 57 is displayed along with print data 56 in area B, or print pattern 56 and reference luminance pattern are displayed in area D. FIG. 57 is superimposed and displayed, and the operator refers to the reference luminance distribution pattern FIG. 57 displayed on this screen and uses the gradation mode so that the corresponding density pattern is formed. An image pattern 56, that is, print data 56 is created (step 1). If the computer used to create the print data is not the computer 4 connected to the inkjet printer 2, the created print data is transferred to the computer 4 and stored in the computer 4.
尚、印字データ５６を作成するとき、画面に基準用輝度分布パターン図５７を表示しないで、プリントされた基準用輝度分布パターン図５７を単に参照するだけでも良い。
次に、ＲＩＰ（Ｒａｓｔｅｒｌｍａｇｅ　Ｐｒｏｃｅｓｓｏｒ）で画像パターン５６をインクジェット吐出フォーマットへ変換する（ステップ２）。
次にインクジェットプリンタ２で導光板６上に印刷を実施する（ステップ３）。次に、印刷済みの導光板６をＬＥＤ点灯台７２に装着し、カメラ７４で撮影することで導光板６の明るさの分布を計測する（ステップ４）。
次に、カメラ７４の出力データに基づいて導光板の輝度分布パターン図３９をコンピュータの画面に出力し、印刷する（ステップ５）。 When the print data 56 is created, the printed reference luminance distribution pattern diagram 57 may be simply referred to without displaying the reference luminance distribution pattern diagram 57 on the screen.
Next, the image pattern 56 is converted into an ink jet discharge format by RIP (Raster Image Processor) (step 2).
Next, printing is performed on the light guide plate 6 by the inkjet printer 2 (step 3). Next, the printed light guide plate 6 is mounted on the LED lighting stand 72, and the brightness distribution of the light guide plate 6 is measured by photographing with the camera 74 (step 4).
Next, the luminance distribution pattern diagram 39 of the light guide plate is output on the computer screen based on the output data of the camera 74 and printed (step 5).
次に、印刷済み導光板６の輝度分布パターン図３９と、基準用輝度分布パターン図５７をコンピュータの画面上で、又は、プリントアウトした２枚のパターン図５７，３８を目で比較し（ステップ６）、印刷済み導光板６が満足すべき輝度分布パターンを備えているかどうか判定する（ステップ７）。
判定結果が不合格の場合には、ステップ１に戻り、印字データ５６を修正する。この修正作業のとき、操作者は、図２に示すように、コンピュータの画面４ａのエリアＡに印字データ５６を表示し、これと並べて、エリアＢ，Ｃにそれぞれ基準用輝度分布パターン図５７と、測定輝度分布パターン図３９を表示したり、あるいは、エリアＤに、印字データ５６、基準用輝度分布パターン図５７、測定輝度分布パターン図３９の３つの任意の組み合わせを重ね合わせて表示する。判定結果が合格の場合には、導光板の試作サンプルを依頼先へ提出し（ステップ８）依頼先の評価が合格であれば、導光板の量産体制へ移行し、不合格であればステップ１に戻る。 Next, the luminance distribution pattern diagram 39 of the printed light guide plate 6 and the reference luminance distribution pattern diagram 57 are compared on the computer screen or the two printed pattern diagrams 57 and 38 are visually compared (step). 6) It is determined whether or not the printed light guide plate 6 has a satisfactory luminance distribution pattern (step 7).
If the determination result is unacceptable, the process returns to step 1 and the print data 56 is corrected. At the time of this correction work, as shown in FIG. 2, the operator displays the print data 56 in the area A of the computer screen 4a and arranges it along with the reference luminance distribution pattern diagram 57 in the areas B and C, respectively. The measured luminance distribution pattern diagram 39 is displayed, or any combination of the print data 56, the reference luminance distribution pattern diagram 57, and the measured luminance distribution pattern diagram 39 is superimposed on the area D and displayed. If the determination result is acceptable, a prototype of the light guide plate is submitted to the requester (step 8). If the requester's evaluation is acceptable, the system shifts to the light guide plate mass production system. Return to.
２　　　　インクジェットプリンタ
４　　　　コンピュータ
６　　　　導光板
６ａ　　　発光面
６ｂ　　　印刷面
８　　　　テーブル
１０　　　横レール
１２　　　記録ヘッド
１４　　　記録ヘッド
１６　　　記録ヘッド
１８　　　記録ヘッド
２０　　　ヘッドキャリッジ
２２　　　インクタンク
２４　　　インクタンク
２６　　　インクタンク
２８　　　インクタンク
３０　　　インクデータテーブル
３２　　　縁部
３４　　　縁部
３６　　　縁部
３８　　　縁部
３９　　　輝度分布パターン図
４０　　　光源
４２　　　インク
４４　　　反射板
４６　　　ディスプレイ
４８　　　インク選択ボタン
５０　　　混合ボタン
５２　　　印字率ボタン
５４　　　インクドット
５６　　　印字データ（印刷用画像パターン）
５７　　　基準用輝度分布パターン図
５８　　　コア部分
６０　　　縁部
６２　　　縁部
６４　　　縁部
６６　　　縁部
６８　　　プリズムシート
７０　　　拡散板
７２　　　ＬＥＤ点灯台
７４　　　カメラ 2 Inkjet printer 4 Computer 6 Light guide plate 6a Light emitting surface 6b Printing surface 8 Table 10 Horizontal rail 12 Recording head 14 Recording head 16 Recording head 18 Recording head 20 Head carriage 22 Ink tank 24 Ink tank 26 Ink tank 28 Ink tank 30 Ink data table 32 Edge 34 Edge 36 Edge 38 Edge 39 Luminance distribution pattern diagram 40 Light source 42 Ink 44 Reflector 46 Display 48 Ink selection button 50 Mix button 52 Print rate button 54 Ink dot 56 Print data (print image pattern)
57 Reference luminance distribution pattern 58 Core portion 60 Edge portion 62 Edge portion 64 Edge portion 66 Edge portion 68 Prism sheet 70 Diffusion plate 72 LED lighting stand 74 Camera

Claims (12)

  1. コンピュータに格納された画像作成ソフトにより導光板に用いる光反射のための印字データを作成し、該作成した印字データをインクジェットプリンタに転送し、該インクジェットプリンタによって白インクで導光板の印刷面に、光源から導光板の内部に出射される光を乱射させるための反射印刷を施し、液晶ＴＶ用の導光板を作成する方法であって、基準となる液晶ＴＶ導光板用の輝度分布パターン図を予め作成するプロセスと、前記基準用輝度分布パターン図を参照して、画像ソフトにより光反射のための印字データを作成するプロセスと、前記印字データをインクジェットの吐出フォーマットへ変換するプロセスと、インクジェットプリンタで前記印字データを導光板の印刷面に印刷するプロセスとを備えたことを特徴とする液晶ＴＶ用導光板作成方法。 Create print data for light reflection used for the light guide plate by image creation software stored in the computer, transfer the created print data to the ink jet printer, and use the white ink on the print surface of the light guide plate by the ink jet printer. A method of creating a light guide plate for a liquid crystal TV by performing reflection printing to scatter light emitted from the light source into the light guide plate, and a luminance distribution pattern diagram for a liquid crystal TV light guide plate as a reference in advance A process of creating, a process of creating print data for light reflection by image software, a process of converting the print data into an inkjet discharge format, and an inkjet printer with reference to the reference luminance distribution pattern diagram And a process for printing the print data on a printing surface of a light guide plate. The light guide plate creation method.
  2. 前記印字データを作成するプロセスは、コンピュータの画面の印字データ作成編集エリアと並べて基準用輝度分布パターン図を表示し、或いは、印字データ作成編集エリアに基準用輝度分布パターン図を重ねて表示するようにしたことを特徴とする請求項１に記載の液晶ＴＶ用導光板作成方法。 In the process of creating the print data, the reference brightness distribution pattern diagram is displayed side by side with the print data creation edit area on the computer screen, or the reference brightness distribution pattern diagram is displayed in the print data creation edit area. The method for producing a light guide plate for a liquid crystal TV according to claim 1.
  3. 印刷の完了した導光板をＬＥＤ点灯台に装着し導光板の発光面の輝度を測定し、輝度分布パターン図を作成するプロセスと、前記測定した輝度分布パターンと、前記基準用輝度分布パターンを比較し、前記印字データの良否を判定するプロセスとを備えたことを特徴とする請求項１に記載の液晶ＴＶ用導光板作成方法。 Install the printed light guide plate on the LED lighting stand, measure the brightness of the light emitting surface of the light guide plate, create a brightness distribution pattern diagram, and compare the measured brightness distribution pattern with the reference brightness distribution pattern And a process for determining whether or not the print data is good. The method for producing a light guide plate for a liquid crystal TV according to claim 1.
  4. 前記基準用輝度分布パターン図と測定した輝度分布パターン図が輝度を色で表現したものであることを特徴とする請求項１に記載の液晶ＴＶ用導光板作成方法。 2. The method for producing a light guide plate for a liquid crystal TV according to claim 1, wherein the reference luminance distribution pattern diagram and the measured luminance distribution pattern diagram express the luminance in color.
  5. 前記印字データがグラデーションパターンにより構成されていることを特徴とする請求項１に記載の液晶ＴＶ用導光板作成方法。 2. The method for producing a light guide plate for a liquid crystal TV according to claim 1, wherein the print data is composed of a gradation pattern.
  6. 前記印字データのドット径または印刷パターンをＴＶ液晶パネルの薄さに対応させ、前記導光板の印刷面のドットが液晶パネルに映らないようにしたことを特徴とする請求項１に記載の液晶ＴＶ用導光板作成方法。 2. The liquid crystal TV according to claim 1, wherein a dot diameter or a print pattern of the print data is made to correspond to a thinness of the TV liquid crystal panel so that dots on the printing surface of the light guide plate are not reflected on the liquid crystal panel. Light guide plate creation method.
  7. 前記白インクの酸化チタンの含有量の割合を１０％以下としたことを特徴とする請求項１に記載の液晶ＴＶ用導光板作成方法。 2. The method for producing a light guide plate for a liquid crystal TV according to claim 1, wherein the content ratio of titanium oxide in the white ink is 10% or less.
  8. 前記白インクに銅フタロシアニンを添加したことを特徴とする請求項１に記載の液晶ＴＶ用導光板作成方法。 2. The method for producing a light guide plate for a liquid crystal TV according to claim 1, wherein copper phthalocyanine is added to the white ink.
  9. 前記インクジェットプリンタに、前記導光板の発光面の色温度を決定する複数種類の白インクを種類ごとにインクタンクに収納した白インク供給部を設け、前記インクジェットプリンタに複数個の記録ヘッドを設け、前記各記録ヘッドに前記インクタンクの中の１つをそれぞれ接続して、各記録ヘッドが互いに種類の異なる白インクを吐出できるように成し、前記インクジェットプリンタが前記導光板に前記反射印刷を形成して、選択した一種類または複数種類の白インクの組み合わせに対応する色温度を備えた導光板を作成するようにしたことを特徴とする請求項１に記載の液晶ＴＶ用導光板作成方法。 The ink jet printer is provided with a white ink supply unit that stores a plurality of types of white ink for determining the color temperature of the light emitting surface of the light guide plate in an ink tank, and the ink jet printer is provided with a plurality of recording heads. One of the ink tanks is connected to each of the recording heads so that each recording head can eject different types of white ink, and the inkjet printer forms the reflective printing on the light guide plate The light guide plate creation method for a liquid crystal TV according to claim 1, wherein a light guide plate having a color temperature corresponding to a selected combination of one or more types of white ink is created.
  10. 前記導光板の発光面の色温度を決定する複数種類の各白インクは、それぞれのインク中の酸化チタンの粒子径の分布が異なっていることを特徴とする請求項１に記載の液晶ＴＶ用導光板作成方法。 2. The liquid crystal TV according to claim 1, wherein the plurality of types of white inks that determine the color temperature of the light emitting surface of the light guide plate have different titanium oxide particle size distributions in the respective inks. Light guide plate creation method.
  11. 前記導光板の発光面の色温度を決定する複数種類の各白インクは、それぞれのインク中の酸化チタンの含有量の割合が異なっていることを特徴とする請求項１に記載の液晶ＴＶ用導光板作成方法。 2. The liquid crystal TV according to claim 1, wherein each of the plurality of types of white ink that determines the color temperature of the light emitting surface of the light guide plate has a different content ratio of titanium oxide in each ink. Light guide plate creation method.
  12. インクジェットプリンタと、光反射パターンの印字データを作成するための画像作成ソフトが格納されたコンピュータとを備え、光反射パターンの印字データをインクジェットプリンタに転送し、該インクジェットプリンタによって導光板の印刷面に、光源から導光板の内部に出射された光を乱射させるための反射印刷を酸化チタンを含む白インクを使用して施し、導光板を作成する装置であって、コンピュータの印字データ作成編集画面上に予め用意した基準用輝度分布パターン図を並べて或いは重ねて表示して、該基準用輝度分布パターン図を参照して前記印字データを作成できるようにし、前記反射印刷を行うための印字データを、前記導光板の四方向の縁部に対応する四方向の縁部からそれぞれ対向する縁部の前方に位置して設定された高濃度設定ポイントに向けて印字の濃度が高くなるようにし、導光板の輝度分布パターンを測定した結果が前記基準用輝度分布パターン図に近似するようにしたことを特徴とする導光板作成装置。 An inkjet printer and a computer storing image creation software for creating print data of the light reflection pattern, transferring the print data of the light reflection pattern to the inkjet printer; , An apparatus for creating a light guide plate by applying reflection printing to diffuse light emitted from the light source into the light guide plate using white ink containing titanium oxide, on a print data creation editing screen of a computer The reference luminance distribution pattern diagrams prepared in advance are displayed side by side or superimposed, so that the print data can be created with reference to the reference luminance distribution pattern diagrams, and the print data for performing the reflection printing, The light guide plate is set to be positioned in front of the opposite edges from the four edges corresponding to the four edges of the light guide plate. The light guide plate creating apparatus is characterized in that the print density increases toward the high density set point, and the result of measuring the brightness distribution pattern of the light guide plate approximates the reference brightness distribution pattern diagram. .
PCT/JP2012/082523 2012-02-16 2012-12-14 Method and device for creating light guide plate for liquid crystal tv WO2013121671A1 (en)

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