TWI429967B - A fabrication method to improve an absorption axis precision of a polarizer - Google Patents

Description

Manufacturing method for improving absorption axis accuracy of polarizing plate

The present invention relates to a method of manufacturing a polarizing plate, and more particularly to a manufacturing method for improving the accuracy of an absorption axis of a polarizing plate.

The polarizing plate is an important imaging part in the liquid crystal screen. The accuracy of the absorption axis will affect the overall imaging effect of the panel.

At present, the production of polarizing plates is firstly carried out by laminating three layers of continuous coils containing at least TAC/PVA/RETARDER, and then three layers of continuous coils are attached with a protective film and a release film to form five layers of continuous coils. After that, according to the order, the required size is cut from five consecutive layers of material.

However, when the required size is cut from five consecutive rolls, it is usually based on the geometric center of the required size, and the protective film, the release film, and the five-layer continuous roll are removed through practical application. The absorption axis of only one of the materials is measured, and then, the required number of sheets is continuously cut according to the measured absorption axis. When the cutting is performed in this way, the measurement of the absorption axis by the protective film or the release film is affected by the protective film and the release film, and it is difficult to obtain the accuracy of the polarizing plate in the three-layer laminated state in practical use. Absorption axis. Moreover, even if it is considered to be homogeneously produced, the absorption axis of each part of the three-layer continuous web produced is slightly changed. When the protective film and the release film affecting the measurement result are measured, and only one absorption axis is measured and cut into a predetermined size of the plurality of sheets, the absorption axes of the respective polarizing plates are different, even if The multi-layer polarizing plates cut from the continuous coil of the same base material have different imaging effects.

Previously, after removing the protective film and the release film of the five-layer continuous roll produced, the absorption axis at the geometric center of the cut size was measured, and then the angle of the cutting device was controlled according to the measurement result, and the cutting was performed. The proposed proposal, but due to the lack of protection of the protective film and the release film, it is easy to damage the polarizing plate, resulting in poor production yield.

Furthermore, when the protective film and the release film are previously attached, the edges of the three-layer continuous roll width direction are exposed, and the angle of the cutting device is controlled according to the measurement result of the absorption axis of the three-layer continuous roll width direction edge. In the proposal of cutting, there is a slight deviation between the absorption axis of the continuous width direction of the continuous material and the absorption axis of the other part of the width direction, and the polarizing plate having the ideal absorption axis cannot be cut accordingly.

In this regard, the present invention provides a manufacturing method for improving the accuracy of the absorption axis of a polarizing plate, comprising at least: three layers of continuous coils for making a polarizing plate; and measuring along a longitudinal direction of the three layers of continuous winding, at predetermined intervals in the longitudinal direction The three-layer continuous roll has an absorption axis at least one of a width direction; the three-layer continuous roll edge in the width direction indicates a mark representing the absorption axis information and the position information of the place; The three-layer continuous roll is attached with a protective film, and the release film forms five layers of continuous roll; the mark is read; the angle and position of the cutting device are controlled according to the mark; and the five layers of continuous roll are cut to a predetermined size.

According to the above-described manufacturing method for improving the absorption axis precision of the polarizing plate of the present invention, the absorption axis of at least one of the width directions of the continuous winding material is actually measured at a predetermined pitch in the longitudinal direction, and the mark is marked on the edge of the continuous winding material. During the cutting, the mark is read to obtain the absorption axis information and the position information to be cut, and the angle and position of the cutting device are controlled for cutting, and each piece of the cut product has accurate absorption axis precision, and Protected by protective film and release film, it can increase production yield. In this way, the continuous coil of the marked mark can be flexibly applied, and when a plurality of polarizing plates of a plurality of sizes are cut from the same continuous roll, the absorption axis precision of each polarizing plate is also good.

Further, the predetermined interval in the longitudinal direction and the position in the width direction may be determined according to the predetermined size to be cut. Thereby, the step of marking the mark can be reduced, and the mark is marked only at the predetermined position of the cut, thereby shortening the working time.

At this time, the step of measuring the absorption axis of at least one of the width directions of the three-layer continuous web at predetermined intervals; and the three-layer continuous web edge indication in the width direction represents the absorption axis information and the portion The steps of the location information can be repeated. The step of reading the mark; the step of controlling the angle and position of the cutting device according to the mark; and the step of cutting the five-layer continuous roll into a predetermined size may also be repeated.

In addition, the step of measuring the absorption axis of at least one of the width directions of the three layers of continuous web at predetermined intervals is performed on the edge of the three-layer continuous web in which the width direction is performed to represent the absorption axis information and the position thereof. The process position can be compressed by the upstream position of the three-layer continuous material at the step of the information mark. Similarly, if the step of reading the mark is performed at the upstream position of the five-layer continuous web at the step of controlling the angle and position of the cutting device according to the mark, the process man-hour can also be compressed.

Fig. 1 is a flow chart showing a manufacturing method for improving the absorption axis accuracy of the polarizing plate of the present invention. The manufacturing method for improving the absorption axis precision of the polarizing plate of the present invention includes at least a step S100 of producing a polarizing plate with a mark, and a step S200 of cutting the polarizing plate with a mark.

Fig. 2 is a detailed flow chart showing a step S100 of producing a polarizing plate with a mark, and Fig. 3 is a view showing a process of producing a polarizing plate with a mark. In the step S100 of producing the polarizing plate with a mark, first, in step S110, a three-layer laminated polarizing plate is continuously wound. In this step, a conventional three-layer continuous roll 903 comprising a three-layer laminate of TAC/PVA/RETARDER can be produced in accordance with a conventional technique.

Next, in step S120, the absorption axis of the continuous web of the polarizing plate is measured at predetermined intervals along the three-layer continuous web length direction. As shown in FIG. 3, in this step, the predetermined position of the three-layer continuous reel 903 is set as the starting point, and the measuring device 100 measures at least one of the width directions of the three-layer continuous reel 903 of the starting point (this embodiment). The absorption axis of the center portion transmits the absorption axis measurement result and the position information at the place where the measurement is performed to the indicator controller 700. The measuring device 100 for measuring the absorption axis can employ various measuring instruments conventionally used. Between the measuring device 100 and the three-layer continuous web 903, a wide-direction relative moving means (not shown) is included to change the relative position of the measuring device 100 and the three-layer continuous web 903 in the width direction, and the position where the measurement is performed The information can be provided by the information when the measuring device 100 is moved by the moving means (for example, driving a pulse of the stepping motor).

Next, in step S130, the indicator controller 700 displays the mark 210 by the marking device 210 in the width direction edge of the same continuous web 903 in the above step S120 according to the measurement result and the measured position information, and the measurement result and the measured position. The information is recorded in the continuous roll 903 with the mark 210.

Thereafter, the three-layer continuous web 903 is relatively moved in the traveling direction, and at least a predetermined position of the measurement is performed at a predetermined interval from the previous measurement, and the measuring device 100 is further measured at least one of the width directions of the three-layer continuous web 903. The absorption axis, and the step S130, indicates that the device 200 marks the mark 210 at the widthwise edge of the continuous web 903.

The marking device 200 may be, for example, a printing device such as an inkjet or a dot matrix, a marking device such as a laser or a diamond knife, or the like. The symbol 210 may be a bar code symbol of two-dimensional, three-dimensional or the like, or may be various characters and symbols that can be visually recognized. Since the absorption axes of the different positions are slightly changed, the information represented by each symbol 210 is also different. The predetermined interval described above can be controlled by controlling the travel distance of the three-layer continuous web 903. In addition, the number of times of performing step S120 and step S130 repeatedly can be freely set according to actual needs.

Next, in step S140, a protective film and a release film (not shown in Fig. 3) are attached to the portion of the three-layer continuous roll 903 where the mark is completed, thereby forming a five-layer laminated continuous roll. This completes the steps of producing the polarizing plate S100 with the mark. The width of the protective film and the release film must be at least greater than a predetermined cut size. If the width of the protective film or the release film to be attached is greater than or equal to the width of the three continuous sheets 903, the protective film and the release film must be read by the following reading device 300 through the protective film and the release film. Take the token 210.

Fig. 4 is a detailed flow chart showing the step S200 of cutting the polarizing plate with the mark, and Fig. 5 is a view showing the cutting of the polarizing plate with the mark attached. In the step of cutting the polarizing plate S200 with the mark, first, in step S210, the reading device 300 reads the symbol 210, and transmits the information represented by the symbol 210 to the cutting controller 800.

The reading device 300 can be any reading device that can read the symbol 210, such as a bar code reader, scanner, camera, camera, etc., as long as the information represented by the symbol 210 can be interpreted. If the protective film or the release film is not covered by the mark 210, the reading device 300 can directly read the mark 210. When the protective film or the release film is overlaid on the mark 210, when the reading device 300 reads the mark 210, it is not necessary to remove the protective film of the five-layer continuous sheet 905, and the release film directly passes through the protective film. The film is used to read the mark 210 indicated on the three-layer continuous sheet 903 actually used. In the step S130 of the indicator mark 210, the measured absorption axis information is directly indicated by the symbol 210, and the protective film and the release film can be read by the reading device 300, and the reading device 300 can pass through the protective film. The film is read away from the film 210 and the relevant information read will not change.

Next, in step S220, the cutting controller 800 controls the angle and position of the cutting device according to the absorption axis information and the position information represented by the symbol 210 read by the reading device 300. A wide-direction relative moving means (not shown) is included between the cutting device 400 and the five-layer continuous web 905 to change the relative position of the cutting device 400 in the width direction of the five-layer continuous web 905. The range of angles and positions of the cutting device 400 can be freely set according to actual needs.

Next, in step S230, the polarizing plate of the five-layer continuous web 905 is cut into a cutting size 910 by the cutting device 400 controlled to a predetermined angle.

Thereafter, the five-layer continuous roll 905 is relatively moved in the traveling direction, and the predetermined position of the cut size 910 can be cut again, and the reading mark 210 of step S210 and the angle of the cutting device 400 of step S220 are repeatedly performed. The cut size 910 is cut from the position and the step S230. The predetermined position at which the cutting size 910 can be cropped again can be controlled by controlling the travel distance of the five-layer continuous web 905.

As shown in Fig. 3, in the step S100 of producing the polarizing plate with the mark, when the step S120 of measuring the absorption axis of the continuous reel of the polarizing plate is measured at predetermined intervals, a short distance is used as a predetermined interval, and the marking is performed. Step S130 of the mark, and then step S120 and step S130 are repeated. When the step S100 is performed, the edge of the three-layer continuous web 903 is densely labeled with the symbol 210. In the step S200 of cutting the polarizing plate with the mark, the cutting can be easily performed for a plurality of different sizes, or When cutting in a single size, the spacing of the residual material can be reduced, and the polarizing plate can be cut more densely to avoid waste. However, if the symbol 210 is densely labeled with a short distance, it takes a lot of man-hours to perform the steps S120 and S130 in a dense manner, and the process is slow. On the other hand, in step S120, the size to be cut in the step S200 of cutting the polarizing plate with the mark may be repeated, and the steps S120 and S130 may be repeatedly performed with the appropriate distance as the predetermined interval.

As shown in FIG. 3, in the step S100 of the symbol-attached polarizing plate, when the step S130 of the symbol 210 is indicated, the indicator device 210 indicates that the symbol 210 is the absorption axis at the central portion in the width direction of the polarizer measured by the measuring device 100. After the step S130 is completed, the steps S120 and S130 are performed. However, if the measuring device 100 is installed upstream of the indicator device 200, the absorption axis of the central portion of the polarizing plate in the same width direction is already before the step S130 of the marking symbol 210. The measurement is performed upstream, the measurement result is transmitted to the indicator controller 700, and the distance information between the measuring device 100 and the marking device 200 is transmitted, and the working hours of step S120 and step S130 can be compressed.

Similarly, as shown in FIG. 5, in the step S200 of cutting the polarizing plate with the mark, when the step S210 of the symbol 210 is read, the symbol 210 read by the reading device 300 indicates that the cutting position is currently to be performed. Absorbing axis information in the central portion of the polarizing plate in the width direction, and then performing steps S220, S230, ..., but if the reading device 300 is disposed upstream of the cutting device 400, the cutting device 400 is reached at a predetermined cutting position on the polarizing plate. The step S210 of reading the symbol 210 is completed before, and the information represented by the symbol 210 is transmitted to the cutting controller 800, and the spacing information between the reading device 300 and the cutting device 400 is transmitted, that is, the step S210 and the step are compressed. Working hours of S220 and S230.

The schematic diagram of the polarizing plate with the symbol shown in Fig. 3 shows that only the absorption axis of the center portion in the width direction of the three-layer continuous web 903 is measured, but as shown in Figs. 6, 7 based on the predetermined cutting size. The geometric center measures the absorption axis, and marks a plurality of absorption axis measurement values in the same width direction in the symbol 210. At this time, the symbol 210 includes a plurality of absorption axis angles, and also includes a plurality of absorptions in the width direction. Axis measurement of position information. After the polarizing plate with the symbol is formed as shown in FIG. 6, as shown in FIG. 7, the respective cutting positions of the cutting device are adjusted according to the measured values of the different absorption axes in the same width direction recorded by the symbol 210, and The polarizing plate is cut at an angle of each cutting position.

In addition, in the schematic view of the polarizing plate with a symbol shown in FIG. 3, the absorption axis of the center portion in the width direction of the three-layer continuous web 903 is measured only at a predetermined pitch, but as shown in Fig. 8, The absorption axis data of the complex position in the same width direction of the three-layer continuous web 903 is measured at a predetermined pitch in the long direction, and the plurality of absorption axis measurement values in the same width direction are marked in the symbol 210, at this time, in the symbol 210 In addition to the angles of the plurality of absorption axes, data of the measurement position in the width direction is also included. Then, as shown in FIG. 9, the angle and position of the cutting device can be adjusted according to the data in the symbol 210A, and the polarizing plate 910A can be cut out, and the cutting devices of different sizes can be respectively adjusted according to the data in the symbol 210B. The polarizing plates 910B1 and 910B2 are cut out.

According to the manufacturing method of the present invention for improving the absorption axis accuracy of the polarizing plate, the absorption axis of at least one of the width directions of the continuous web is actually measured at a predetermined pitch in the longitudinal direction, and the mark is marked on the edge of the continuous sheet. At the time of cutting, the mark is read to obtain the absorption axis information and the position information to be cut, and the angle and position of the cutting device are controlled for cutting, and each piece of the cut product has an accurate absorption axis precision, and Protected by protective film and release film, it can increase production yield.

100. . . Measuring device

200. . . Marking device

210. . . mark

300. . . Reading device

400. . . Cutting device

700. . . Marking controller

800. . . Cutting controller

903. . . Three-layer continuous coil

905. . . Five layers of continuous coil

910. . . Cutting size

The above and other objects, features, advantages and embodiments of the present invention will become more apparent and understood.

Fig. 1 is a flow chart showing a manufacturing method for improving the absorption axis accuracy of the polarizing plate of the present invention.

Fig. 2 is a detailed flow chart showing the production of a polarizing plate with a mark.

Fig. 3 is a schematic view showing the production of a polarizing plate with a mark.

Fig. 4 is a detailed flow chart showing the cutting of the polarizing plate with the mark.

Fig. 5 is a view showing the cutting of a polarizing plate with a mark.

Fig. 6 is a view showing the construction of a polarizing plate with a mark based on a geometric center of a predetermined cutting size.

Fig. 7 is a view showing an embodiment of cutting the polarizing plate produced in Fig. 6.

Fig. 8 is a view showing the absorption axis measured at a predetermined pitch in the longitudinal direction and the width direction of the continuous web, and the measured values of the plurality of absorption axes in the same width direction are recorded as a mark, and a polarizing plate with symbols is prepared.

Fig. 9 is a view showing an embodiment of cutting the polarizing plate produced in Fig. 8.

S100~S200. . . step

Claims (6)

A manufacturing method for improving the accuracy of an absorption axis of a polarizing plate, comprising at least: three layers of continuous coils for making a polarizing plate; and measuring the three-layer continuous roll at a predetermined interval in a long direction along the length direction of the three consecutive layers of continuous winding An absorption axis of at least one of a width direction; a mark of the three-layer continuous web in the width direction indicating a position information of the absorption axis information and the position information; the three-layer continuous material of the marked mark Applying a protective film, the release film forms a five-layer continuous roll; reading the mark; controlling the angle and position of the cutting device according to the mark; and cutting the five-layer continuous roll into a predetermined size. A manufacturing method for improving the absorption axis accuracy of a polarizing plate according to claim 1, wherein the position information at the position is determined according to the predetermined size. A manufacturing method for improving the absorption axis precision of a polarizing plate according to claim 1, wherein the step of measuring an absorption axis of at least one of the width directions of the three continuous sheets at a predetermined interval; The three-layer continuous web edge marks the step of indicating the information of the absorption axis and the position information of the position; and repeating the above steps continuously until the three-layer continuous material label is completed. The manufacturing method for improving the absorption axis precision of a polarizing plate according to claim 1, wherein the step of reading the mark; the step of controlling the angle and position of the cutting device according to the mark; the cutting the five-layer continuous roll The steps of the material; and repeating the above steps continuously until the five-layer continuous roll cutting is completed. The manufacturing method of improving the absorption axis precision of the polarizing plate according to claim 1, wherein the step of measuring the absorption axis of at least one of the width directions of the three layers of continuous coil at a predetermined interval is performed in the width direction The three-layer continuous web edge is marked with an upstream position of the three-layer continuous web at the step of indicating the information of the absorption axis information and the position information of the position. The manufacturing method for improving the absorption axis precision of the polarizing plate according to claim 1, wherein the step of reading the mark is the five-layer continuous roll when the step of controlling the angle and position of the cutting device according to the mark is performed. The upstream position of the material is carried out.