JP2017207660A - Color filter printing system, color reflective display panel, and method of manufacturing color reflective display panel - Google Patents

Abstract

A color filter printing system capable of easily and efficiently reducing a position error of a color filter is provided. A color filter printing system includes a holding table that holds a substrate on a holding surface, a printing unit that performs plateless printing of a color filter, and a first printing unit that is at least parallel to the holding surface with respect to the holding table. Measuring at least eight alignment parts on the substrate associated with the pattern and estimating the deformation amount of the pattern based on the measured position coordinates of the alignment part. And a position correcting unit that corrects the printing position of the color filter by the printing unit and controls the movement amount of the relative moving unit and the printing unit so as to print the color filter based on the corrected printing position. [Selection] Figure 1

Description

  The present invention relates to a reflective display and a method for manufacturing a reflective display.

As the display device, for example, a display device such as a liquid crystal display, an organic EL display, or a reflective display is widely used. In these display devices, a flexible display using a plastic film or the like as a support base of the display unit is known.
For example, in Patent Document 1, a semiconductor device in which a thin film transistor (TFT) and a light emitting element driven by the TFT are formed on a film-like support is incorporated as a display unit of a mobile phone or a television receiver. Have been described.
Patent Document 2 describes a color display manufacturing method in which a color filter arrangement pattern is displayed in monochrome for each color on a display before forming a color filter, and a colorant is discharged by an ink jet method in accordance with the displayed pattern. ing.

Japanese Patent Laid-Open No. 2005-210086 JP 2007-298632 A

However, the conventional color filter printing system and color filter printing method have the following problems.
When the flexible display described in Patent Document 1 is colorized, it is necessary to overlap color filters on a plurality of light emitting elements constituting a unit pixel. For example, when the unit pixel is composed of three light emitting elements, color filters colored in red (R), green (G), and blue (B) are overlaid on each other.
However, unlike the glass substrate, the resin base material of the substrate of the flexible display is easily deformed due to thermal expansion, absorption / desorption, relaxation of internal stress, and the like. For this reason, the substrate of the flexible display on which the light emitting element is formed (hereinafter referred to as a substrate with a display unit) is deformed to some extent due to the influence of the environment of the subsequent process or the storage environment, and the pixel arrangement position is also deviated from the design value. (Hereinafter, shifting the pixel array position from the design value is also referred to as deformation). The displacement amount of the pixel arrangement varies depending on, for example, variations in deformation characteristics of the resin base material, temperature environment in the manufacturing process of the light emitting element formation, variations in pressure conditions, and the like. Is difficult to predict.
If a color filter is formed on such a substrate with a display unit based on the design value of the pixel arrangement pattern, non-uniform displacement occurs between the light emitting element and the color filter, resulting in color unevenness and color misregistration. However, there is a problem that good color developability cannot be obtained.

It is also conceivable to use the technique described in Patent Document 2 when forming the color filter. However, in the technique described in Patent Document 2, it is necessary to drive the substrate with a display unit and turn on the light emitting elements at the portions where the color filters are formed.
For this reason, it is necessary to assemble a drive circuit on a substrate with a display portion that is not completed as a display device, and to apply a voltage corresponding to each color pattern. In order to perform such an operation, it is necessary to take out the substrate with the display unit from the production line. Furthermore, there is a problem that such work is difficult to automate.
In addition, the formation position of the color filter needs to read the light emission of each light emitting element and acquire the position and shape of the light emitting region of each light emitting element. For this reason, high measurement accuracy is required for the measurement of the formation position of the color filter, and it is necessary to measure a large number of light emitting regions as a whole. For example, when the boundary of the light emitting region is not clear due to the influence of internal reflection or diffraction, there is a problem that the acquisition accuracy of the formation position of the color filter also deteriorates.

  In recent years, since the display has been required to have a larger size and higher definition, it has been strongly required to further reduce the arrangement error of the color filter with respect to the light emitting element or the pixel electrode.

  The present invention has been made in view of the above problems, and even when a substrate on which a two-dimensional pattern for defining the arrangement position of the color filter is deformed, a color filter for the two-dimensional pattern is obtained. It is an object of the present invention to provide a reflective display and a method for manufacturing the reflective display that can easily and efficiently reduce the positional deviation error.

One aspect of the present invention is a color filter printing system in which a color filter is formed by plateless printing on a substrate on which a two-dimensional pattern defining the arrangement position of the color filter is formed,
A holding table for holding the substrate on a holding surface;
A printing unit for plateless printing the color filter;
A relative movement unit that allows the printing unit to move relative to the holding table at least in a first direction parallel to the holding surface;
Printing the color filter by the printing unit by measuring at least eight alignment units on the substrate associated with the pattern and estimating the deformation amount of the pattern based on the measured position coordinates of the alignment unit. A color filter printing system comprising: a position correction unit that corrects a position and controls a movement amount of the relative movement unit and the printing unit so as to print the color filter based on the corrected printing position.

Another aspect of the present invention is a reflective color display including at least a base material layer, a reflective display layer, a drive unit for driving the reflective display layer, and a color filter for coloring the reflective display layer. And
The color reflective display panel is characterized in that at least eight or more two-dimensional patterns defining the arrangement positions of the color filters are formed on either the base material layer or the reflective display layer.

  A color filter ink receiving layer may be formed on the reflective display layer of the color reflective display panel described above.

  A synthetic resin may be included in the base material layer of the color reflective display panel described above.

  Another aspect of the present invention is a method for manufacturing a color reflective display panel, wherein the color filter portion of the color reflective display panel is formed by an inkjet method using the above-described color filter printing system. .

  According to the color filter printing system and the reflective display of the present invention, the position of the representative point associated with the two-dimensional pattern formed on the substrate is measured, and the deformation amount of the pattern is determined from the measured position coordinate of the representative point. Since the print position of the color filter is corrected by estimating the position of the color filter, even if the substrate on which the two-dimensional pattern defining the position of the color filter is formed is deformed, the position of the color filter relative to the two-dimensional pattern is changed. There is an effect that the error can be easily and efficiently reduced.

It is a top view which shows an example of the display apparatus containing a color filter. It is a top view of the display apparatus when there is no distortion. It is a top view of a display device in case there is distortion. It is an enlarged view of a color filter plan view. It is sectional drawing of a display substrate.

  Hereinafter, a color filter mounting system according to an embodiment of the present invention will be described with reference to the drawings.

  First, a reflective flexible display layer is prepared. As the flexible display layer, an electrophoretic method and a twist ball can be used, but it is preferable that the display can be switched flexibly and by an electric field.

  Next, a flexible drive system is prepared. As the flexible drive system, a flexible TFT (for example, Patent Document 1) made by laminating an organic semiconductor element on a flexible substrate can be used.

  A flexible reflective display can be obtained by laminating the flexible display layer and the flexible TFT.

  Examples of the substrate used in the flexible display include plastic materials (synthetic resins) such as polyethylene terephthalate (PET), polyimide, polyethersulfone (PES), polyethylene naphthalate (PEN), and polycarbonate.

  Usually, an alignment mark is formed on the substrate. As an alignment mark forming method, there is a method in which a photosensitive resin is exposed and developed by photolithography after transfer by printing or sputtering of a metal. is there.

  The plastic material expands and contracts due to thermal expansion, absorption / dehydration, relaxation of internal stress, and the like. For example, the coefficient of thermal expansion in PET is 15 ppm / ° C., the coefficient of hygroscopic expansion is 12 ppm /% RH, and a substrate with a side of 300 mm has an expansion of about 20 μm when the temperature changes by 5 ° C. or humidity by 5% To do. Furthermore, internal stress is generated in the plastic material depending on the stretching direction at the time of film formation, the pressure at the time of lamination, and the like, and when these relax, the plastic material may be deformed by several hundred ppm.

  A printing method for correcting the position of the color filter on the deformed flexible reflective substrate will be described below.

  As a printing machine, what uses an inkjet method is preferable. By using the inkjet method, it is not necessary to prepare a plate for each printing, and printing can be performed at the position of the color filter that has been efficiently corrected.

  As the ink used in the ink jet printing apparatus, an ink using a UV curable ink is preferable. By using the UV curable ink, it is not necessary to use heat when the ink is cured, and deformation of the flexible reflective substrate can be suppressed. In order to impart UV curability to the ink, a method of adding a photopolymerizable monomer and a photopolymerization initiator to the ink can be used.

  An outline of the ink jet apparatus will be described with reference to FIG. The display device body 6 is disposed on a substrate stage (not shown). It is preferable to use a method of sucking the substrate by using a pressure difference in order to enhance the adhesion when the substrates are arranged. The substrate stage can move in at least one direction (the y-axis direction in FIG. 1). The alignment mark position of the display device main body 6 arranged on the substrate stage is measured by mark reading cameras 25L and 25R that can operate in the x-axis direction orthogonal to the y-axis direction. Based on the position of the alignment mark measured by the mark reading camera, an ideal pixel position is calculated by a calculator (not shown) to determine the ink discharge position. A droplet is ejected from the inkjet head 23 incorporated in the inkjet head unit 24 operating in the x-axis direction to the calculated ink ejection position, thereby forming a pixel.

  2 and 3 show a display device body 6 for printing a color filter. FIG. 2 shows a state without distortion, and FIG. 3 shows a state with distortion. However, these are schematic views, and the dimensions and shape are exaggerated for ease of viewing. In addition, although there are eight alignment marks in the figure, the number of alignment marks of the present invention can be 6 + 2n (where n is a natural number). It is preferable that the alignment marks be arranged on the entire substrate, and it is preferable to install the alignment marks at four points at the four corners of the substrate and at four points at the middle points of the four sides of the substrate.

In the display device body 6, a plurality of pixels P including a plurality of sub-pixels are arranged in a lattice shape in a rectangular region in plan view. That is, the pixels form a two-dimensional pattern extending in the surface direction of the display device body 6 when viewed in the thickness direction of the flexible substrate.
In this embodiment, as an example, the pixels P are arranged in a grid of J rows × I columns (where J and I are integers of 2 or more). Here, the row represents the arrangement in the illustrated horizontal direction, and the column represents the arrangement in the illustrated vertical direction.
The design value of the arrangement pitch of the pixels P in each row is a constant value ΔX. The design value of the arrangement pitch of the pixels P in each column is a constant value ΔY. ΔX and ΔY may be equal to or different from each other.
In order to distinguish a pixel at a specific position from among the pixels P, subscripts i and j (where i is an integer of 1 to I and j is an integer of 1 to J) are added, and “ Pixel (P _{i, j)} ”(“ Pixel P _{i, j} ”is the minimum structural unit for repeating RGB sub-pixels).
The subscript i represents the number of columns counted from the leftmost column in the drawing, and the subscript j represents the number of rows counted from the lowermost row in the drawing. For example, the pixel P _1,1 represents the pixel P in the lower left corner in the figure, and the pixels PI _{, J} represent the pixel P in the upper right corner in the figure.

  For each sub-pixel of the display device body 6, for example, a known liquid crystal element or organic EL element configuration may be used. Alternatively, for example, a well-known electronic paper configuration may be used for each sub-pixel of the display device body 6. Examples of the configuration of the electronic paper include a cholestic liquid crystal type, a twist ball type, and an electrophoretic type display medium.

The display device body 6 of the present embodiment includes subpixels that perform display corresponding to red, green, and blue. Each sub-pixel may be capable of changing the light emission amount or the reflectance in multiple stages according to the display method.
When red, green, and blue colored layers are arranged at positions facing the sub-pixels in the thickness direction of the display device body 6, light from the sub-pixels becomes red light, green light, and blue light, respectively. And the mixed color is displayed.
As the sub-pixel, a white sub-pixel that changes display brightness may be provided. In this case, only the transparent material is disposed at the portion facing the white sub-pixel.
A certain number of sub-pixels gather to constitute a pixel P that is a display unit. For example, it is possible to configure one pixel P in a certain region including one red pixel, one green pixel, one blue pixel, and one white pixel.
Hereinafter, an example in which the display device body 6 includes a total of three sub-pixels for red, green, and blue and one sub-pixel for white constitutes the pixel P will be described.

The color filter 5 includes a first colored layer R, a second colored layer G, and a third colored layer B that are respectively disposed above the red, green, and blue sub-pixels of the display device body 6. In the present embodiment, a transparent resin layer may or may not be formed on the color filter 5 above the white sub-pixel. In the present embodiment, a case where a transparent resin layer is not formed on the color filter 5 of the white sub-pixel will be described.
Although the shape of the 1st colored layer R, the 2nd colored layer G, and the 3rd colored layer B is not specifically limited, In this embodiment, it is a rectangular shape larger than the sub pixel which is not illustrated. The areas of the first colored layer R, the second colored layer G, and the third colored layer B may be different from each other depending on the area of a sub pixel (not shown). In the present embodiment, as an example, the first colored layer R, the second colored layer G, and the third colored layer B are rectangular shapes having the same shape and the same area.

The first colored layer R, the second colored layer G, and the third colored layer B are subjected to plateless printing by a color filter printing system described later.
The first colored layer R is formed of red ink.
The second colored layer G is formed of green ink.
The third colored layer B is formed of blue ink.
When the first colored layer R, the second colored layer G, and the third colored layer B located above the pixel P _{i, j} are represented, the same subscripts i and j as those of the pixel P are attached to the first colored layer. It represents like layer R _{i, j} , second colored layer G _{i, j} , and third colored layer B _{i, j} .
Hereinafter, the same notation is also used for symbols representing other parts, dimensions, etc. included in the pixel P or related to the pixel P.

The first colored layer R, the second colored layer G, and the third colored layer B are all arranged in a lattice pattern of J rows × I columns on the display device body 6. The design values of the arrangement pitch in the rows and columns are the same as the arrangement pitch of the pixels P, and are ΔX and ΔY, respectively.
The first colored layer R _{i, j} , the second colored layer G _{i, j} , and the third colored layer B _{i, j} are arranged so as to overlap with a sub-pixel (not shown) in each pixel P _{i, j} in plan view. ing. In the following, each pixel _{P i,} the first colored layer _{R i} arranged corresponding to _{j, j,} the second colored layer _{G i, j,} and the third colored layer _{B i,} collectively _j, pixel filter F _{i, j} (F) may be called.
In each pixel filter F, the second colored layer G is located in the same row as the first colored layer R, and is arranged on the right side of the first colored layer R in the drawing. For this reason, the row | line | column which the 2nd colored layer G comprises is located in the illustration right side of the row | line | column which the 1st colored layer R comprises.
In each pixel filter F, the third colored layer B is located in the same column as the first colored layer R, and is arranged adjacent to the lower side of the first colored layer R in the drawing. For this reason, the row of each third colored layer B is located below the row of each first colored layer R in the figure.

Alignment portions a1, a2, a3, a4,... Are formed on the display device body 6 outside the formation region of the color filter 5 in plan view. Hereinafter, when the alignment portions a1, a2, a3, and a4 are collectively referred to, they may be expressed as “alignment portion an” (where n = 1, 2, 3, 4,...). If there is no risk of misunderstanding, the proviso in parentheses may be omitted.
The alignment part an is a mark for measuring the amount of deformation in the surface direction of the display device body 6 when the color filter 5 is formed on the display device body 6. For this reason, the alignment unit an is formed in the display device body 6 before the color filter 5 is formed, in association with the arrangement of the pixels P, which is a two-dimensional pattern that defines the arrangement position of the color filter 5. .
Here, the fact that the position of the alignment portion an is associated with the arrangement of the pixels P is formed with a certain positional relationship in design with respect to the two-dimensional pattern formed by the pixels P, and this positional relationship is the display device. It means to change depending on the deformation of the main body 6.
As long as the alignment part an is a structure which can detect the position in the surface direction on the display apparatus main body 6 by a suitable means, a shape, a material, a formation position, etc. will not be specifically limited.
The alignment unit an may be composed of, for example, an optically readable light reflecting layer, a light absorbing layer, a colored layer, a light scattering layer, and the like. Alternatively, the alignment part an may be formed by, for example, an optically readable concave part, convex part, edge part, hole part, or the like.
In the present embodiment, each of the alignment portions an is configured by a cross mark that can be optically detected from above the display device body 6. The two axes in which the cross extends are parallel to the center lines of the rows and columns of the pixels P, respectively. Like the pixel P, such an alignment portion an forms a two-dimensional pattern extending in the surface direction of the display device body 6 when viewed in the thickness direction of the display device body 6.

In the present embodiment, the alignment portion an is simultaneously formed on the base material layer 1 or the display layer 3 when an opaque wiring layer is formed in the manufacturing process of the display layer 3 described later. The upper part of the alignment unit an is covered with a transparent layer and can be optically read from the outside above the display device body 6.
Thus, if the alignment part an is formed in the manufacturing process of the display layer 3 mentioned later, the alignment part an can be arrange | positioned with respect to each pixel P with high precision.
The position of the alignment part an in the surface direction of the display device body 6 can be measured as the position of an appropriate part determined by the shape of the readable alignment part an.
In this embodiment, the position of the alignment part an (where n = 1, 2, 3, 4,...) Is the alignment part representative point An (where n = 1, 2, 3, 4,...). ).
The alignment unit representative point An is, for example, an intersection of linear portions that form a cross of the alignment unit an (center point of intersection of the linear portions) (see the alignment unit representative point A1 in FIG. 4).

Next, a cross-sectional configuration of the display device 10 will be described.
As shown in FIG. 5, the display device main body 6 of the display device 10 is configured by laminating a base substrate 1, a TFT layer 2, a display layer 3, and an ink fixing layer 4 (receiving layer) in this order. The color filter 5 of the display device 10 is laminated on the surface of the ink fixing layer 4 of the display device body 6.
In the display device 10, a protective film layer having light transmittance may be further provided on the ink fixing layer 4 and the color filter 5.

As shown in FIG. 5, the ink fixing layer 4 is provided so as to cover the display layer 3 at least in the range of the color filter 5 formation region. The ink fixing layer 4 is a layered portion for fixing ink of each color for forming the color filter 5.
As the material of the ink fixing layer 4, an appropriate material is used which has light transmittance and can absorb at least a part of each color ink for forming the color filter 5 and fix the ink. Furthermore, the ink fixing layer preferably has appropriate strength, flatness, heat resistance, and the like.
Examples of suitable materials for the ink fixing layer 4 include urethane resin and acrylic resin.
However, the ink fixing layer 4 may be omitted if the adhesion of the ink forming the color filter 5 to the surface of the display layer 3 is good.

Examples of ink suitable for forming the color filter 5 include UV curable ink. When UV curable ink is used, it is not necessary to heat the ink when it is cured, so that deformation of the display device body 6 caused by heating can be suppressed.
Examples of a method for imparting UV curability to the ink include a method of adding a well-known photopolymerizable monomer and photopolymerization initiator to the ink.
The ink used for forming the first colored layer R, the second colored layer G, and the third colored layer B contains a red pigment, a green pigment, and a blue pigment, respectively.

  The display device 10 described above is manufactured by printing the color filter 5 on the ink fixing layer 4 of the display device main body 6 after the display device main body 6 is manufactured.

  Next, the color filter printing method of this embodiment used for printing the color filter 5 will be described.

The printing position of the data first colored layer R _{i, j} is typically represented by the coordinate value of the first colored layer center pr _{i, j} of the first colored layer R _{i, j} , for example. The area where printing is actually performed (printing area) is, for example, a rectangular range centered on the printing position.
In the present embodiment, the coordinate values are designed such that the straight line passing through the design alignment unit representative points A1, A2, and A3 is the x-axis, and the straight line y axis passing through the design alignment unit representative points A1, A8, and A7. It is described in an xy coordinate system fixed to the display device body 6.
In this embodiment, when a total of four points, which are the midpoints of the quadrilateral sides connected by the four corners, are used as alignment marks, the substrate distortion is proportionally distributed from the eight alignment marks. Thus, a method for determining the pixel position is used.

  When the distortion is proportionally distributed, an intersection of a line connecting A2 and A6 and a line connecting A4 and A8 is defined as a center point C. Then, four rectangles of a rectangle A1A2CA8, a rectangle A2A3A4C, a rectangle CA4A5A6, and a rectangle A8CA6A7 can be created in the display surface.

The coordinates (x _center , y _center ) of the center point C can be obtained using the expressions (1) to (6). Here, (x _a , y _a ) represents the coordinates of A8, (x _b , y _b ) represents the coordinates of A4, (x _c , y _c ) represents the coordinates of A6, and (x _d , y _d ) represents the coordinates of A2.

In the present embodiment, the distortion of the four rectangles of the rectangle A1A2CA8, the rectangle A2A3A4C, the rectangle CA4A5A6, and the rectangle A8CA6A7 is apportioned to determine the color filter arrangement position. A method for apportioning the square distortion will be described by taking the square A1A2CA8 as an example.

Position coordinates (X1, Y1), (X2, Y2), (X3, Y3), (X4, Y4) of the alignment unit representative points A1, A2, A8 and the center point C in the quadrangle A1A2CA8 are represented by the following formulas (7) to (7) 10), and at this time, the coordinate values (Xr _{i, j} , Yr _{i, j} ) of the first colored layer center pr _{i, j} are expressed by the following formula (11). Here, the number of pixels in the rectangle A1A2CA8 is I ′ in the x-axis direction and J ′ in the y-axis direction.

Here, L _X and L _Y are the lengths of the designed sides A1A2 and A1A8, Xsr and Ysr are the x-axis directions from the alignment portion representative point A1 to the first colored layer pri, j, y It is the length in the axial direction. As described above, ΔX and ΔY are design pitches of the first colored layer R in the x-axis direction and the y-axis direction, respectively.

  The display device body 6 in the present embodiment is deformed in the surface direction due to the influence of temperature and humidity conditions and pressurizing conditions in the manufacturing process and the temperature and humidity of the storage environment until it is placed on the holding table.

Therefore, in the color filter printing method of the present embodiment, the position of the representative point is detected in order to detect the displacement of the arrangement position of the display device body 6 and the deformation amount of the display device body 6 after the display device body 6 is arranged. Measure.
The representative point measuring unit measures the position coordinates of the alignment unit representative points A1, A2, A3, A4, A5, A6, A7, and A8 in the xy coordinate system.

From the alignment representative points A1, A2, A3, A4, A5, A6, A7, and A8 calculated by the representative point position calculation unit 103, a line connecting A2 and A6 and an intersection C connecting A4 and A8 are obtained.
Among the representative points, the position coordinates of A1, A2, C, and A8 are represented as (x1, y1), (x2, y2), (x3, y3), and (x4, y4). (See FIG. 2).
Here, an example of the quadrangle A1A2CA8 formed by the representative points A1, A2, C, and A8 will be described, but other quadrangle is similarly corrected.

In the present embodiment, the correction data generation unit 104, first colored layer _{R i,} the first colored layer center _{pr i} is a print position of _j, the coordinate values of _{j (xr i, j, yr} i, j) and, It calculates using following formula (12)-(17).

The above formula (13) proportionally distributes the design value Xsr of the length in the x-axis direction from the side A1A8 to the first colored layer center pr1 _{, j} , and the actually measured value of the expansion / contraction rate between the side A1A2 and the side A8C. Is an expression for converting to a correction value xsr. Here, it is assumed that Xsr is sufficiently small with respect to L _X and is approximately proportionally distributed.
The above equation (14) is the sum of the length in the x-axis direction from the first colored layer center pr _{1, j} to the side A1A8 and the length in the x-axis direction from the first colored layer center pr I _{′, j} to the side A2C. The design value Xbr (see formula (15)) is converted to the correction value xbr in the same manner as Xsr.
M _{L in the} above equation (16) represents an amount of deviation from the design value in the x-axis direction of the point at the j-th row position on the side A1A4 generated by the inclination of the side A1A4. _{M R in} Expression (17) represents the amount of deviation in the x-axis direction of the point at the j-th row position on the side A2C generated by the inclination of the side A2C.

The above equation (19) proportionally distributes the design value Ysr of the length in the y-axis direction from the side A1A2 to the first colored layer center pr _{i, 1} and the actually measured value of the expansion / contraction rate of the side A1A8 and the side A2C. Is an expression for converting into a correction value ysr. Here, Ysr is a sufficiently small with respect to L _Y, is approximately proportional allocation.
The above formula (20) is the sum of the length in the y-axis direction from the first colored layer center pr _{i, 1} to the side A1A2 and the length in the y-axis direction from the first colored layer center pr _{i, J ′} to the side A8C. The design value Ybr (see formula (21)) is converted into a correction value ybr in the same manner as Ysr.
M _{D in the} above equation (22) represents the amount of deviation from the design value in the y-axis direction of the point at the i-th row position on the side A1A2 generated by the inclination of the side A1A2. M _{U in} Expression (23) represents the amount of deviation in the y-axis direction of the point at the i-th row position of the side A8C generated by the inclination of the side A8C.

The above formulas (12) and (18) are obtained by converting the deformation of the quadrangle A1A2CA8 to the inner first coloration based on the actually measured values of the positions of the vertices representing the deformation of the quadrangle A1A2CA8 that is a designed L _X × L _Y rectangle. This is a calculation formula for calculating a coordinate correction value by proportionally allocating to the coordinate position of the layer center pr _{i, j} .

Similarly, the coordinate value (xg _{i, j} , yg _{i, j} ) of the second colored layer GREEN and the coordinate value (xb _{i, j} , yb _{i, j} ) of the third colored layer BLUE are further calculated. In this calculation, the design values Xsr and Ysr in the above formulas (13) and (19) are changed to the design values Xsg and Ysg in the second colored layer G and the design values Xsb and Ysb in the third colored layer B, respectively. The calculation is performed by changing the subscript r of the variable to g and b.
Thus, the correction of the printing position of the color filter 5 is completed.

Thereafter, the apparatus control unit starts control for printing the color filter 5.
When the apparatus control unit sends a control signal for starting printing to the print head and the movement control unit, the movement control unit controls the movement amounts of the holding table moving unit and the print head moving unit, thereby The 1 ink nozzle R, the 2nd ink nozzle G, and the 3rd ink nozzle B are moved to the printing area around the printing position. This movement is performed simultaneously or individually depending on the nozzle arrangement of the print head 23 and the like.
The apparatus control unit starts ink ejection from each nozzle at the timing when the first ink nozzle R, the second ink nozzle G, and the third ink nozzle B reach the print region.

In this way, the first colored layer R, the second colored layer G, and the third colored layer whose print positions are corrected on all the first sub-pixel PR, the second sub-pixel PG, and the third sub-pixel PB, respectively. When B is printed, printing of the color filter 5 is completed.
Thus, even when the display device body 6 is deformed, the color filter 5 is formed at the position where the deformation amount of the display device body 6 is corrected, as shown in FIG.

  As described above, according to the color filter printing method of the present embodiment, even when the substrate on which the two-dimensional pattern defining the arrangement position of the color filter is deformed, the color filter for the two-dimensional pattern Can be easily and efficiently reduced.

Hereinafter, examples of the first embodiment will be described together with comparative examples.
[Example]
In order to form the display device 10, a display device body 6 excluding the ink fixing layer 4 that is an ink fixing layer was produced.
The design values of the arrangement pitch of each pixel P of the electrode circuit in the display layer 3 were set to ΔX = 200 (μm) and ΔY = 200 (μm). The number of pixels in the display layer 3 was I = 400 and J = 600. Therefore, the size of the color filter forming region f was about 80 mm × 120 mm. A blank area which is a non-display portion of about 5 mm in the x-axis direction and about 5 mm in the y-axis direction was formed in the outer peripheral portion of the color filter forming region f.
Alignment marks are arranged at a total of eight positions, four corners and midpoints of the four corners, and design values are A1 = (0,0), A2 = (45,0), A3 = (90,0), A4 = (90,65 ), A5 = (90, 130), A6 = (45, 130), A7 = (0, 130), A8 = (0, 65). The unit of length used for the coordinate value is mm.

For the purpose of stabilizing the operation of the display device 10, the display device body 6 was left to stand in an environment of 70 ° C. and 40% RH for 15 hours in order to adjust the amount of water contained in the display device body 6.
Thereafter, an ink fixing layer 4 was formed on the display layer 3. As a material for the ink fixing layer 4, a mixed material of urethane resin, toluene, water, and IPA was used. This mixed material was applied on the display layer 3 with a die coater so as to have a dry thickness of 6 μm to 8 μm.
In order to dry the ink fixing layer 4, the display device body 6 after the ink fixing layer 4 was applied was heated on a hot plate at 70 ° C. for 10 minutes.

Thereafter, the color filter 5 was formed by the color filter printing method of the first embodiment using the color filter printing system 20.
The position coordinates of the alignment unit representative points A1, A2, A3, A4, A5, A6, A7, and A8 were measured.
A1 = (− 0.005, 0.01)
A2 = (44.92, 0.3)
A3 = (90.103, 0.4)
A4 = (90.113, 65.01)
A5 = (90.108, 129.96)
A6 = (44.81, 129.86)
A7 = (0.02,1299.99)
A8 = (0.05, 65.06)
As can be seen from these measured values, the display device body 6 as a whole was shrunk by about 200 μm.

Thereafter, the first colored layers R, the second colored layers G, and the third colored layers B were printed on the ink fixing layer 4 of the display device body 6 by the color filter printing system 20. At this time, each first colored layer R was printed in a printing region centered on the center of the first colored layer calculated by the above formulas (1) to (23). Similarly, each 2nd colored layer G and each 3rd colored layer B were printed in the printing area | region, respectively.
After the printing of the color filter 5 was completed, the display device 10 was vacuum-dried in an atmosphere of 30 Pa.

  When an image was displayed using the display device 10 thus obtained, the color development was good and the in-plane average NTSC ratio was 8% or more.

[Comparative example]
With respect to the display device main body 6 including the ink fixing layer 4 manufactured in the same manner as in the above embodiment, the display device is configured such that the alignment unit representative point A1 is the origin and the alignment unit representative point A2 is located on the y axis. The main body 6 was placed on the holding table 21. The color filter printing system 20 was used to print the color filter at the design printing position of the above formula (11) without correcting the printing position, thereby obtaining a display device of a comparative example.
When an image was displayed using the display device of the comparative example, the color development was worse than that of the display device 10 of the above example, and the in-plane average NTSC ratio was about 2%.

While the preferred embodiments of the present invention have been described together with examples, the present invention is not limited to these embodiments and examples. Additions, omissions, substitutions, and other modifications can be made without departing from the spirit of the present invention.
Further, the present invention is not limited by the above description.

DESCRIPTION OF SYMBOLS 1 Base material layer 2 TFT layer 3 Display layer 4 Ink fixing layer 5 Color filter 6 Display apparatus main body (board | substrate)
DESCRIPTION OF SYMBOLS 10 Display apparatus 20 Color filter printing system 21 Holding stand 22 Holding stand moving part (relative moving part)
23 Print head (printing section)
24 Print head moving part (relative moving part)
25 Image measurement unit (representative point position measurement unit)

Claims (5)

A color filter printing system that forms a color filter by plateless printing on a substrate on which a two-dimensional pattern that defines the arrangement position of the color filter is formed,
A holding table for holding the substrate on a holding surface;
A printing unit for plateless printing the color filter;
A relative movement unit that allows the printing unit to move relative to the holding table at least in a first direction parallel to the holding surface;
Printing the color filter by the printing unit by measuring at least eight alignment units on the substrate associated with the pattern and estimating the deformation amount of the pattern based on the measured position coordinates of the alignment unit. A color filter printing system comprising: a position correction unit that corrects a position and controls a movement amount of the relative movement unit and the printing unit so as to print the color filter based on the corrected printing position. A reflective color display comprising at least a base material layer, a reflective display layer, a drive unit for driving the reflective display layer, and a color filter for colorizing the reflective display layer,
A color reflective display panel, wherein at least eight two-dimensional patterns defining the arrangement positions of the color filters are formed on either the base material layer or the reflective display layer.   3. A color reflective display panel, wherein a color filter ink receiving layer is formed on the reflective display layer of the color reflective display panel according to claim 2.   A color reflective display panel, wherein the base layer of the color reflective display panel according to claim 2 contains a synthetic resin.   A method for producing a color reflective display panel, wherein the color filter portion is formed by an ink jet method using the color filter printing system according to claim 1.