TW200415386A - Panel stacking device and method to stack LCD panel - Google Patents

Abstract

The present invention relates to a panel stacking device and method. The panel stack device is to stack plural panels of liquid crystal display during manufacturing a liquid crystal display. The panel stacking device comprises: a panel disposition device to dispose the first panel and the second panel of the plural panels; a horizontal adjusting device to move the panel disposition device in the horizontal direction, so as to move the first panel in the horizontal direction; a panel angle variation device to vary the angle between the second panel and the horizontal surface; a panel moving device to move the second panel in the direction of three dimensions; a gluing device to coat photosetting adhesive on at least one face of the two contact surfaces between the first panel and the second panel, and adjust the second panel to have a tilt angle between it and the horizontal surface by the panel angle variation device, then move the second panel by the panel moving device so that one side of the second panel contacts with the first panel, adjust the tilt angle to be zero degree by the panel angle variation device so that the second panel fits with the first panel horizontally; an alignment device to move the first panel by the horizontal adjustment device so that the first panel and the second panel are aligned with respect to the predetermined corresponding position, then apply an external force to press the first panel and the second panel together; an exposure equipment to provide a light source to harden the photosetting adhesive, so as to bond the first panel and the second panel.

Description

200415386 V. Description of the invention (1),, Technical field of the invention: The present invention relates to a panel stacking device and method. The panel stacking device is used to stack a plurality of panels included in a liquid crystal display, especially using a panel stacking device. And a method of stacking a plurality of panels of a color bi-stable liquid crystal display. Prior technology:

In today's fast-changing image processing technology, the development of displays is also rapidly progressing. Liquid crystal displays have the advantages of light weight and power saving, so liquid crystal displays have become the mainstream of technological development.

The content of image information is becoming more and more complex, and LCD displays are gradually developed to display color pictures. In addition to the use of color filters to form a color daylight, the development technology of color liquid crystal displays is especially for cholesterol-structured liquid crystal displays (Surface-Stabilized Cholesteric Texture; SSCT), or bistable liquid crystals. The guest-host LCD of the display can also use three panels to display color, and each panel is sandwiched by two transparent substrates (S and witching) —a liquid crystal layer. These three panels have corresponding The liquid crystal layers of three colors of red, blue, and green, and the liquid crystal layers are used to display the daytime surface of the liquid crystal, and the three colors are combined into a plurality of colors. Among them, the cholesterol structure liquid crystal display does not provide color by controlling the liquid crystal pitch (P t ch) of liquid crystal molecules in the liquid crystal layer, and the host-guest liquid crystal display uses dyes added to the liquid crystal layer to provide color. For color display, if these color liquid crystal displays

Page 6 200415386 V. Description of the invention (2) · If the device is cut with a gray scale of 8 bits (b i t), it can display a 5 1 2 color day surface. This type of three-panel bistable liquid crystal display is particularly applicable to outdoor large signboards or electronic books and other devices. However, for the stacking technology of multiple panels, the conventional technique often has the following disadvantages: misalignment between a plurality of panels. When two panels are laminated, air bubbles are generated between the panels. The light-curing glue is not uniformly hardened, so that the hue of the screen displayed by the light passing through the panel is also unevenly distributed.

Therefore, the main object of the present invention is to provide a panel stacking device and method to solve the above problems. Summary of the invention: The main purpose of the present invention is to provide a panel stacking device and method. The panel stacking device is used to stack a plurality of panels of the liquid crystal display when a liquid crystal display is unsuitable, especially using the panel stacking. The device can more accurately and bubble-freely stack a plurality of panels of a color bistable liquid crystal display. The problem of uneven hue caused by the uneven curing of a photo-curable glue is further improved.

The panel stacking device of the present invention includes a panel placing device for placing a first panel and a second panel of the plurality of panels. A horizontal adjustment device moves the panel placing device in the horizontal direction, thereby moving the first panel in the horizontal direction. A panel angle changing device for changing the second surface

Page 7 200415386 V. Description of the invention (3), 'The angle between the plate and the horizontal plane. A panel moving device moves the second panel in a three-degree spatial direction. A point-glue device applies a light-curable glue to at least one of the two contact surfaces of the first panel and the second panel, and adjusts the second panel to an inclined angle with the horizontal plane by the panel angle changing device. Then, the second panel is moved by the panel moving device so that one side of the second panel is in contact with the first panel, and then the tilt angle is adjusted to zero degrees by the panel angle changing device so that the second panel is horizontally aligned with the first panel. One panel fits. A pair of position device is used to move the first panel by the level adjustment device, align the first panel and the second panel with a predetermined corresponding position, and then apply an external force to the first panel and the first panel. The two panels are pressed together. An exposure apparatus is provided with a light source to harden the photo-curable glue to join the first panel and the second panel. In particular, when the liquid crystal display is the bistable liquid crystal display, a driving circuit is used, before the light curing adhesive is hardened by the light source, only the light curing adhesive of a plurality of predetermined positions is hardened by the light source, and then using The driving circuit forms an electric field to drive the liquid crystal layer into a heterogeneous phase (Foca 1 c nicte Xture), so that a light emitted by the light source can pass through the liquid crystal layer uniformly, so that the photohardenability The glue hardens uniformly. Therefore, the panel stacking device and method of the present invention are used to stack a plurality of panels included in the liquid crystal display. Thereby, a plurality of panels of a color bi-stable liquid crystal display can be aligned accurately, without bubbles, and the liquid crystal layer can be driven into the mixed phase by the driving circuit, which can improve the hardening of the photocurable adhesive. The uniformity causes the problem of uneven hue in the daytime development.

200415386 V. Description of the invention (4). The advantages and spirit of the present invention can be further understood through the following detailed description of the invention and the attached drawings. Embodiment: Please refer to FIG. 1, which is a schematic diagram of a panel stacking device 10 according to the present invention. For bistable liquid crystal displays such as color cholesterol-structured liquid crystal displays (Surface-S tabi 1 ized Cholesteric Texture; SSCT) or guest-host LCDs, these bistable liquid crystal displays are based on three Each panel corresponds to a liquid crystal layer of three colors of red, blue, and green to display a color day surface, and each panel is formed by two transparent substrates sandwiching a liquid crystal layer. Since there are a plurality of panels to be stacked, the present invention provides a panel stacking device 10 for stacking a plurality of panels included in the liquid crystal display. The panel stacking device 10 includes a panel placing device 18, a level adjusting device 20, a panel moving device 2 2, a panel angle changing device 2 4, a glue dispensing device 26, and a pair of positioning devices. First, the air bubbles in the photo-hardenable glue placed in a glue storage container were evacuated by a vacuum state created by a vacuum machine. The photo-curable adhesive is a photo-curable resin (U V adhesive). Usually, the curable adhesive absorbs the energy of light having a wavelength of 436nm, 365nm, or 254nm and is completely hardened to have the ability to cement a panel. The panel placing device 18 is used to place the first panel 14 and the second panel 16 of the plurality of panels. The panel placing device 18 sucks the first sucker 30 with the lower sucker 30.

200415386 V. Description of the invention (5) · 'One panel 1 4. Further referring to FIG. 2, FIG. 2 is a schematic top view of the level adjusting device 20 of the present invention. The horizontal adjustment device 20 includes a standard X-axis adjuster 3 4, a standard Y-axis adjuster 3 6, and a rotary adjuster 3 8. The coordinate X-axis adjuster 3 4 is used to move the panel in the horizontal direction of the X-axis. Placement device 18, coordinate Y axis adjuster 3 6 is used to move the panel placement device 1 8 in the horizontal direction of the Y axis, and rotation adjuster 3 8 is used to rotate the panel placement device 18 in the horizontal direction, thereby horizontally Move and adjust the position of the first panel 14.

The panel angle changing device 24 absorbs the second panel 16 with an upper suction cup 32, and the panel angle changing device 24 is used to change the angle between the second panel 16 and the horizontal plane. The panel moving device 22 is used to move the panel angle changing device 24, thereby moving the second panel 16 in a three-degree spatial direction. Dispensing device 26, the light-curing adhesive is applied on the surface of the panel in a straight strip on at least one of the two contact surfaces of the first panel 14 and the second panel 16; the dispensing device 2 6 It is programmable to control the dispensing position and the amount of dispensing. With the panel angle changing device 24, the second panel 16 is adjusted to an inclined angle with the horizontal plane, and the inclined angle is at least more than 1 degree. The first panel 14 is in contact with the non-horizontal plane of the second panel 16 to avoid air bubbles. produce. Then, the second panel 16 is moved by the panel moving device 2 2 so that one side of the second panel 16 is in contact with the first panel 14, and then the tilt angle is adjusted to zero degrees by the panel angle changing device 24 so that the second panel 1 6 Laminate the first panel 14 with a horizontal plane. In this lamination method, bubbles can be driven out from the gap between the first panel 14 and the second panel 16.

Page 10 200415386 V. Description of the invention (6) *-Please refer to FIG. 3, which is a schematic diagram of the alignment device. The registration device includes a monitoring screen 40 and an image capturing device 28. The first panel 14 is moved by the horizontal adjustment device 20 so that the first panel 14 and the second panel 16 are aligned to a predetermined corresponding position. The first panel 14 includes a first pair of points 4 2, the second panel 16 includes a second pair of points 4 4, and the image capture device 28 is used to capture the first pair of points 4 2 The image and the image of the second alignment point 44 are visually aligned through the monitoring screen 40, and the first panel 14 is moved by the level adjustment device 20 to align the image of the first alignment point 4 and the second image. The positions where the images of the two pairs of positions 44 are aligned, the images of the first pair of positions 42 and the images of the second pair of positions 44 are aligned with each other are the predetermined corresponding positions. Generally, the image capturing device 28 is an image sensing lens of two charge coupled devices (C harge Coup 1 ed Device; CCD). The first panel 14 has two first alignment points 4 2 at opposite corners. They are distributed on the first panel 14, and the second panel 16 also has two corresponding second pairing points 44, which are diagonally distributed on the second panel 16, and the two charge-coupled element image sensing lenses are respectively captured. Take a set of images of the first and second alignment points 44 and make them appear on one or two monitoring screens 40 to visually align them. Please refer to FIG. 4. FIG. 4 is a schematic diagram of the present invention for uniformly hardening the photocurable adhesive 56. The panel stacking device 10 further includes a pressing device and an exposure device 46. Pressing device system. An external force is applied to press the first panel 14 and the second panel 16 together, and the light-curing adhesive 56 between the first panel 14 and the second panel 16 can be evenly distributed through the pressing. . The exposure device 4 6 provides a light 50 to harden the light-curable adhesive 56 to bond the first panel 14 and the second panel 16. its

200415386 V. Description of the invention (7). Before the light-curing adhesive 56 is cured by light 50, only a plurality of predetermined positions of the light-curing adhesive 56 are cured by using a point light source. The area occupies only a small part of the panel area. This step is called pre-fixing, and the purpose is to temporarily fix the first panel 14 and the second panel 16. The panel stacking device 10 further includes a driving circuit 48, and then an electric field is formed by the driving circuit 48. The electric field can drive the arrangement of a plurality of liquid crystal molecules 54 in the liquid crystal layer 5 8 of the first panel 16. The layer 5 8 is sandwiched by two transparent substrates 52. After the bistable liquid crystal display is driven by an electric field, there are three types of liquid crystal molecules arranged in a 5 4 manner: a mixed phase (Focal conic texture), a planar phase (Planar texture), and a vertical phase (Homeotropic texture). The mixed phase system is The “dark state stable” plane phase is a bright state stable state, while the vertical phase system is an unstable state. After the electric field drives the liquid crystal layer 58 into a heterogeneous phase, the heterogeneous and stable liquid crystal molecules 54 are arranged in the heterogeneous phase, thereby using the light 50 emitted from the exposure device 46 to pass through the liquid crystal layer 58 uniformly due to scattering. Then, the light-curing adhesive 5 6 is uniformly and comprehensively hardened by using the light. In addition to bonding the first panel 丨 4 and the second panel 丨 6 ′, the light-curing adhesive 5 6 can be uniformly hardened, so that The displayed day surface can be uniform. Please refer to FIG. 5, which is a flowchart of a method for stacking panels according to the present invention. FIG. 5 is a stacking method of the panel stacking device 10 of FIG. 1. For a bi-stable liquid crystal display such as a color cholesterol-structured liquid crystal display (Surface-Stabilized Cholesteric Texture (SSCT)) or a guest-host LCD (Guest-Host LCD), the present invention provides a kind of bistable liquid crystal display. Panel stacking method, used to stack a liquid crystal display

Page 12 200415386 V. Description of the invention (8) · The method of stacking a plurality of panels includes the following steps: Step S 0 2: Place the first panel 14 of the plurality of panels. Step S 0 4: The air bubbles in a photo-curable glue are evacuated by a vacuum state created by a vacuum machine. Step S 0 6: apply the light-curable adhesive to the surface of the first panel 14 in a straight strip. Step S 0 8: Adjust a tilt angle of the second panel 16 to the horizontal plane by more than 1 degree. Step S 1 0: The second panel 16 is moved in the direction of a three-degree space so that one side of the second panel 16 is in contact with the first panel 14. Step S 1 2: Adjust the inclination angle to zero degrees so that the second panel 16 is attached to the first panel 14 in a horizontal plane. Step S 1 4: Move the first panel 14 in the horizontal direction so that the first panel 14 and the second panel 16 are aligned to a predetermined corresponding position. The first panel 14 includes a first pair of points 4 2 and the second panel 16 includes a second pair of points 4 4. An image capture device 28 is used to capture the first pair of points. The image of 4 2 and the image of the second alignment point 4 4, move the first panel 14 to align the first alignment point 4 2

200415386 V. Description of the invention (9) * The image of the second alignment point 44 and the image of the first alignment point 42 and the image of the second alignment point 44 are aligned with each other as the predetermined position. Corresponding position. Step S 1 6: An external force is applied to press the first panel 14 and the second panel 16 together. Step S 1 8: The light-curable adhesive is hardened by a light source to join the first panel 14 and the second panel 16. Please refer to FIG. 6, which is a flowchart of step S 1 8 of the panel stacking method of the present invention. The above step S 1 8 further includes the following steps: Step S 2 0: Use the light source to harden the light-curable adhesive at a plurality of predetermined positions, and the area of the plurality of predetermined positions only occupies a small part of the panel area. This step is called pre-setting. The purpose of fixing is to temporarily join and fix the first panel 14 and the second panel 16. Step S 2 2: A driving circuit is used to form an electric field to drive the liquid crystal layer into a mixed phase (Foca 1 c nicte X ture), so that a light emitted by the light source can pass through the liquid crystal layer uniformly. . Step S 2 4: Use the light to uniformly and comprehensively harden the photo-curable adhesive to join the first panel 14 and the second panel 16.

Page 14 200415386 V. Description of the Invention (1) Therefore, the panel stacking device 10 and method of the present invention are used to stack a plurality of panels included in the liquid crystal display. Thereby, a plurality of panels of the color bistable liquid crystal display can be stacked more accurately and without bubbles, and the liquid crystal layer is further driven into the mixed phase by the driving circuit, thereby improving uneven curing due to the photocurable adhesive This causes the problem of uneven hue in daytime imaging.

With the above detailed description of the preferred embodiments, it is hoped that the features and spirit of the present invention may be described more clearly, rather than limiting the scope of the present invention with the preferred specific embodiments disclosed above. On the contrary, the intention is to cover various changes and equivalent arrangements within the scope of the patent to which the present invention is intended.

Page 15 200415386 Brief description of the drawings Figure 1 is a schematic diagram of the panel stacking device of the present invention; Figure 2 is a schematic top view of the level adjusting device of the present invention; Figure 3 is a schematic view of a positioning device; Figure 4 is a photocuring adhesive of the present invention Schematic diagram of uniform hardening; Figure 5 is a flowchart of the panel stacking method of the present invention; and Figure 6 is a flowchart of step S 1 8 of the panel stacking method of the present invention.

Explanation of symbols on page 16 • 10 panel stacking device 14 first panel 16 second panel 18 panel placing device 20 leveling device 22 panel moving device 24 panel angle changing device 26 dispensing device 28 image capturing device 30 lower suction cup 32 Upper sucker 34 Coordinate X-axis adjuster 36 Coordinate Y-axis adjuster 38 Rotary adjuster 40 Monitor screen 42 First registration point 44 First-registration point 46 Exposure-in. Ax backup 48 drive circuit 50 light 52 transparent Substrate 54 Liquid crystal molecules 56: Photocurable adhesive 58 Liquid crystal layer

Claims (1)

200415386 6. Scope of Patent Application · A panel stacking device, which is used to stack a plurality of panels of the liquid crystal display when manufacturing a liquid crystal display. The panel stacking device includes: a panel placing device, which is used for A first panel and a second panel of the plurality of panels are placed; a horizontal adjustment device is used to move the panel placement device in a horizontal direction, thereby moving the first panel in a horizontal direction; a panel angle changing device is used To change the angle between the second panel and the horizontal plane; a panel moving device that moves the second panel in the direction of three degrees of space; a glue device on at least one of the two contact surfaces of the first panel and the second panel A light-curing adhesive is applied on the top, and the second panel is adjusted to an inclined angle with the horizontal plane by the panel angle changing device, and then the second panel is moved by the panel moving device so that one side of the second panel and the first A panel touches, and then adjusts the tilt angle to zero degrees by the panel angle changing device so that the second The board is attached to the first panel in a horizontal plane; a pair of positioning devices is used to move the first panel by the level adjustment device, align the first panel and the second panel with a predetermined corresponding position, and then apply An external force is used to compress the first panel and the second panel. An exposure device is provided with a light source to harden the photo-curable adhesive to join the first panel and the second panel. 2. The panel stacking device according to item 1 of the scope of patent application, wherein the liquid crystal display includes three panels, and the panel includes: Page 17 200415386 6. Scope of patent application 1. A liquid crystal layer is used to display the daylight surface and the color of the screen, and two transparent substrates are used to enclose the liquid crystal layer; wherein the three liquid crystal layers are respectively The three colors of red, blue and green are displayed, and the three colors are combined into a plurality of colors, so that the liquid crystal display displays a colored daylight surface. 3. The panel stacking device according to item 2 of the patent application, wherein the color liquid crystal display is a cholesterol-structured liquid crystal display (Surface — Stabilized Cholesteric Texture; SSCT). 4. The panel stacking device as described in item 2 of the scope of patent application, wherein the color liquid crystal display is a host-guest liquid crystal display (G u e s t-Η 〇 s t L C D). 5. The panel stacking device described in item 1 of the scope of the patent application, wherein the light-hardening adhesive is a light-curing resin (U V glue). 6. The panel stacking device according to item 1 of the scope of patent application, wherein the panel stacking device further comprises a vacuum machine, and before applying the photocurable adhesive, the light is hardened by the vacuum state caused by the vacuum machine. The bubbles in the gel are detached. 7. The panel stacking device according to item 1 of the scope of patent application, wherein the photocurable adhesive is applied on the surface of the panel in a straight strip. 200415386 6. Scope of patent application < · 8. The panel stacking device as described in item 1 of the scope of patent application, wherein the panel angle changing device changes the angle between the second panel and the horizontal plane by more than 1 degree during lamination. 9. The panel stacking device according to item 1 of the scope of patent application, wherein the first panel includes a first alignment point, the second panel includes a second alignment point, and the alignment device further includes an image capture The fetching device is used for capturing the image of the first alignment point and the image of the second alignment point, and moving the first panel by the level adjustment device to align the image of the first alignment point and the Image of the second pair of sites. 10. The panel stacking device according to item 2 of the scope of patent application, wherein the liquid crystal display is a bistable liquid crystal display, and the panel stacking device further includes a driving circuit for hardening the light-curable adhesive at the light source. Previously, only the light source was used to harden the photo-curable adhesives at a plurality of predetermined positions, and then an electric field was formed using the driving circuit to drive the liquid crystal layer into a mixed phase (Foca 1 cOnicte X ture), whereby A light emitted by the light source can pass through the liquid crystal layer uniformly, and then the light-curing adhesive is hardened uniformly and comprehensively by the light source. 1 1. A panel stacking method for stacking a plurality of panels of a liquid crystal display when manufacturing a liquid crystal display. The panel stacking method includes the following steps: placing a first panel of the plurality of panels; Page 19 200415386 6. Application scope of patents' · Applying a light-curable adhesive to the surface of the first panel; adjusting a second panel to an inclined angle with the horizontal plane; μ moving the second panel in the direction of three degrees of space, so that One side of the second panel is in contact with the first panel; 'Adjust the tilt angle to zero degrees so that the second panel fits with the first panel in a horizontal plane; move the first panel in a horizontal direction so that the first panel and The second plate is aligned with a predetermined corresponding position; an external force is applied to press-fit the first panel and the second panel; the light-curable adhesive is hardened by a light source to join the first panel and That brother-panel. 1 2. The panel stacking method as described in item 11 of the scope of patent application, wherein the liquid crystal display includes three panels, the panel includes:, a liquid crystal layer for displaying a daylight surface and the color of the screen Two transparent substrates are used to cover the liquid crystal layer, wherein the three liquid crystal layers display three colors of red, blue, and green, respectively, and the three colors are combined into a plurality of colors, so that the liquid crystal display displays a color. Day surface. 1 3. The panel stacking method as described in item 12 of the scope of patent application, wherein the color liquid crystal display is a cholesterol-structured liquid crystal display (Surface-Stabilized Cholesteric Texture; SSCT). Page 20 200415386 6. Scope of patent application · · 14. The panel stacking method described in item 12 of the scope of patent application, wherein the color liquid crystal display is a guest-guest liquid crystal display (G uest-Η 〇st LCD) . 15. The panel stacking method according to item 11 of the scope of patent application, wherein the photo-curable adhesive is a photo-curable resin (U V adhesive). 16. The panel stacking method according to item 11 of the scope of patent application, wherein the panel stacking method further comprises the following steps: before applying the photocurable adhesive, the light is applied by a vacuum state created by a vacuum machine. The air bubbles in the hardening glue are detached. 17. The panel stacking method according to item 11 of the scope of patent application, wherein the photocurable adhesive is applied to the surface of the panel in a straight strip. 18. The panel stacking method as described in item 11 of the scope of patent application, wherein the panel angle changing device changes the angle between the second panel and the horizontal plane by more than 1 degree during bonding. 19. The panel stacking method according to item 11 of the scope of patent application, wherein the first panel includes a first pair of sites, the second panel includes a second pair of sites, and the panel stacking method additionally uses a An image capture device is used to capture an image of the first alignment point and an image of the second alignment point, and the first panel is moved by the level adjustment device to align the image of the first alignment point. And the second Page 21 200415386 6. Scope of Patent Application · The image of the alignment point. 20. The panel stacking method according to item 12 of the scope of the patent application, wherein the liquid crystal display is a bistable liquid crystal display, and the panel stacking method further includes before the light curing adhesive is hardened by using the light source, The following steps: use the light source to harden the photo-curable glue at a plurality of predetermined positions; use a driving circuit to form an electric field to drive the liquid crystal layer into a mixed phase (Foca 1 c nicate X ture), thereby The light source emits a uniform light through the liquid crystal layer; the light-curing adhesive is hardened uniformly and comprehensively by using the light source. Page 22