JP2013167780A - Method and device for producing light guide plate for liquid crystal tv - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light guide plate for liquid crystal TV, which is capable of exhibiting a satisfactory visual effect.SOLUTION: A brightness distribution pattern diagram for a liquid crustal TV light guide plate as a reference is preliminarily created, and printing data for light reflection is created by image software while referring to the reference brightness distribution pattern diagram. The created printing data is transferred to an inkjet printer and is converted to a discharge format of inkjet by RIP, and a printing surface of the light guide plate is subjected to reflective printing for irregularly reflecting light emitted from a light source into the light guide plate, by the inkjet printer, whereby the light guide plate for liquid crystal TV is produced.

Description

The present invention relates to a method and an apparatus for producing a light guide plate for a liquid crystal TV (television).

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 using an ink jet printer (see, for example, Patent Document 1).
Further, it is conventionally known to print a light guide plate using a gradation technique (see, for example, Patent Document 2).

JP-A-9-68614 Japanese Utility Model Publication No. 5-55103

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.

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 the printing surface of the light guide plate with white ink on the printing surface of the light guide plate to scatter the 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.
Further, the invention is characterized in 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 ink jet 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 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 using white ink containing titanium oxide on the printing surface of the light plate, and printing on the computer To display the reference luminance distribution pattern diagrams prepared in advance on the data creation / editing screen side by side or in an overlapping manner 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 setting 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.

It is explanatory drawing of this invention. It is explanatory drawing of this invention. It is explanatory drawing of this invention. It is block explanatory drawing of this apparatus. It is explanatory drawing of this invention. It is explanatory drawing of this invention. It is explanatory drawing of this invention. It is explanatory drawing of a light-guide plate. It is explanatory drawing of a light-guide plate. It is explanatory drawing of a light-guide plate. It is explanatory drawing of a part of liquid crystal screen display apparatus. It is explanatory drawing of a light-guide plate. It is explanatory drawing of this invention. It is explanatory drawing of this invention. It is explanatory drawing of this invention. It is explanatory drawing of this invention. It is explanatory drawing of this invention. It is explanatory drawing of this invention. It is explanatory drawing of this invention. It is explanatory drawing of this invention. It is explanatory drawing of this invention. It is explanatory drawing of this invention. It is explanatory drawing of this invention.

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.

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.

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.

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.

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.

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.

[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. The ideal white ink has a uniform titanium oxide particle size distribution of 200 nm to 400 nm as shown in FIG. Is to exist. In that case, it becomes white which uniformly reflects light 400 nm-800 nm (visible light) having a wavelength twice as large as the particle diameter 200 nm-400 nm.

However, in the 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.

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.

FIGS. 19 to 21 are distribution image diagrams of the particle diameter of titanium oxide in the ink. The horizontal axis indicates the particle diameter, and the vertical axis indicates 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.

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. .

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. 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 1-7 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. 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. In this range, printing in an arbitrary range such as 0 to 100% is possible.

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.

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. .

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, and 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.

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.

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.

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.

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).

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.

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.

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.

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.

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.

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.

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.

In addition, since an inkjet printer can use a plurality of resolutions depending on 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.

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).

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.

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).

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 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)

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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. .

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