TW554202B - 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

554202 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 method. , Stacking multiple panels of color bistable 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 monitors have been gradually developed to display color daylight. In addition to the use of color filters to form a color daylight, the development technology of color liquid crystal displays is especially for cholesteric 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. Each panel is sandwiched by two transparent substrates (S and witching) —a liquid crystal layer. These three panels have corresponding Liquid crystal layers of three colors of red, blue, and green, and the liquid crystal layers are used to display the daylight surface of the liquid crystal display and the three colors are combined to form a plurality of colors of pictures. Among them, the cholesterol structure of the liquid crystal display system is controlled by the liquid crystal pitch of the liquid crystal molecules in the liquid crystal layer (P i t c h) to provide color, 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 554202 V. Description of the invention (2) If the device is cut with 8-bit (b i t) gray scale, it can display a 5 1 2 color picture. This kind of bi-stable liquid crystal display with three panels displays color, especially it can be applied to large outdoor signboards, or devices such as e-books. However, stacking techniques / know-how for multiple panels often have the following disadvantages: misalignment between multiple 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 daylight surface 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 object of the present invention is to provide a panel stacking device and method. The panel stacking device is used for stacking a plurality of panels of the liquid crystal display when manufacturing a liquid crystal display. Accurately and bubble-freely stack a plurality of panels of a color bistable liquid crystal display. The problem of uneven hue of the daytime image due to uneven curing of a photocurable 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 placement device in the horizontal direction, thereby moving the first panel in the horizontal direction. A panel angle changing device for changing the second surface

554202 V. Description of the invention (3)

The angle of the board from 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 positioning device is used to move the first panel by the level adjustment device, so that the first panel and the second panel are aligned to a predetermined corresponding position, and then an external force is applied 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 mixed phase (Foca 1 c nicate X ture), so that a light emitted by the light source can pass through the liquid crystal layer uniformly, so that the photo-hardening property 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 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 development.

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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 according to the present invention. For bistable liquid crystal displays such as a color cholesterol-structured liquid crystal display (Surface —StabiHzed Cholesteric Texture; SSCT) or a guest-host LCD (Guest-Host LCD), the color screen is displayed in red corresponding to the three panels. Every panel is formed. Because there are several panels, a panel stacking device 10 is used to stack the panels. The panel stacking device 10 includes a side surface 20, a panel moving device 22, a device 26, and a pair of positioning devices. LCD display, the bistable liquid crystal display, blue, green three color liquid crystal layers are stacked by two transparent substrates and a liquid crystal layer, so the present invention provides a 'night crystal display' includes a plurality of panel placement devices 1 8. A horizontal adjustment panel angle changing device 2 4. A little glue First, by storing 衮 51 Ψ > A% one-time vacuum, remove the air bubbles placed in a ΐ ΐ chemical adhesive . Xiao Guang hardening glue ^ Light hardening resin (υ V glue), s / series ... .ΟΡΓ /) hanging through the hardening glue will absorb the wavelength of 436nm, 365nm, or 2R4nm # & > ^ of gastric plate ability. Z54nm front-line energy is fully hardened and has a cemented surface panel placement device 18, plate 14 and second panel 16 for placing the first panel placement device 18 of the plurality of panels under the suction cup 3 〇 Adsorption

Page 9 554202 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 34, a standard Y-axis adjuster 36, and a rotary adjuster 38. The coordinate X-axis adjuster 3 4 is used to move the panel placement device in the horizontal direction of the X-axis. 18, the 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 the rotation adjuster 3 8 is used to rotate the panel placement device 18 in the horizontal direction, thereby moving in the horizontal direction 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 to 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. The second panel 16 is adjusted to an inclined angle with the horizontal plane by the panel angle changing device 24, 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 with the first panel 14 in 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 554202 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 horizontal adjustment device 20 moves the first panel 14 to align the first panel 14 and the second panel 16 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 2 and the second image. The position φ where the images of the two pairs of positions 44 are aligned, the image of the first pair of positions 42 and the images of the second pair of positions 4 4 are the predetermined corresponding positions. Generally, the image capturing device 28 is two charge-coupled device (CCD) image sensing lenses. The first panel 14 has two first alignment points 4 2 and is diagonally distributed on the first panel 1. On the second panel 16 there are also two corresponding second alignment points 4 4, which are diagonally distributed on the second panel 16. The two charge-coupled element image sensing lenses respectively capture a group The images of the first and second alignment points 44 are displayed on one or two monitor screens 40 for visual alignment. Please refer to FIG. 4. FIG. 4 is a schematic view 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. The pressing device applies an external force to press the first panel 14 and the second panel 16 together. By pressing, the light-curable adhesive 56 between the first panel 14 and the second panel 16 can be uniformly distributed. The exposure device 4 6 provides a light 50 to harden the photocurable adhesive 56 to bond the first panel 14 and the second panel 16. Its,

Page 11 554202 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 5 4 in the liquid crystal layer 5 8 of the second 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 arrangements of liquid crystal molecules 54, which are mixed.

The mixed phase (Focal conic texture), the planar phase (Planar texture), and the vertical phase (Homeotropic texture). The mixed phase system is stable in the dark state. The planar phase is stable in the bright state, and the vertical phase is unstable. 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 evenly 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 picture 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 panel having a plurality of panels to be stacked. Panel stacking method, used to stack a liquid crystal display

Page 12 554202 V. Description of the invention (8) A plurality of panels are included, and the method for stacking the 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 photohardenable # glue are evacuated by a vacuum state created by a vacuum machine. Step S 0 6: The photohardenable glue is coated on the surface of the first panel 14 in a straight line. Step S 0 8: Adjust a second panel 16 to an inclined angle of more than 1 degree with the horizontal plane. Step S 1 0: Move the second panel 16 in a three-degree spatial direction so that one side of the second panel 16 and the first panel 1 4 Contact. 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 to make the first Panel 1 4 # is aligned with a predetermined corresponding position with the second panel 16. The first panel 14 includes a first pair of positions 4 2, and the second panel 16 includes a second pair of positions 4 4, An image capturing device 28 is used to capture the image of the first pair of positions 4 2 and the image of the second pair of positions 4 4 Like, move the first panel 14 to align the first alignment point 4 2-

Page 13 554202 V. Description of the invention (9) and the image of the second alignment point 44, the positions of the image of the first alignment point 42 and the image of the second alignment point 44 are aligned with each other. Predetermined 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 glue 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 (Focal conic texture), 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 554202 V. Description of the invention (ίο) Therefore, the panel stacking device 10 and method of the present invention are used to stack the plurality of panels included in the liquid crystal display. Thereby, a plurality of panels of the color bi-stable liquid crystal display can be stacked accurately and airlessly, and the liquid crystal layer can be further driven to the mixed phase by the driving circuit, so as to improve the hardening due to the photo-hardening adhesive. The unevenness causes the problem of uneven hue in daytime development. 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, and the scope of the present invention is not limited by the preferred specific embodiments disclosed above. On the contrary, the purpose is to hope to cover various changes and equivalent arrangements within the scope of the patent scope of the present invention.

Page 15 554202 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 A schematic diagram of uniform hardening; FIG. 5 is a flowchart of a method for stacking panels of the present invention; and FIG. 6 is a flowchart of step S 1 8 of a method for stacking panels of the present invention. Explanation of symbols of the drawing • 10 panel stacking device 14 first panel 16th _ _ 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 on Suction cup 34 Coordinate X-axis adjuster 36 Coordinate Y-axis adjuster 38 Rotary adjuster 40 Monitor screen 42 First registration point 44 Second registration point 46 Exposure device 48 Drive circuit 50 Light 52 Transparent substrate 54 Liquid crystal molecules 56 Light hardening Adhesive 58 liquid crystal layer

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Claims (1)

554202-;-^ ~ ^ ~ 4 ^ ·-6. Scope of Patent Application 1. A panel stacking device is used to stack a plurality of panels of the liquid crystal display when manufacturing a liquid crystal display. The panel is stacked. The device includes: * a panel placement device for placing a first panel and a second panel of the plurality of panels; a level adjustment device for moving the panel placement device in a horizontal direction, thereby horizontally Move the first panel in the direction; a panel angle changing device is used to change the angle between the second panel and the horizontal plane; a panel moving device is used to move the second panel in the direction of three degrees of space; A light-curing adhesive is applied to at least one of the two contact surfaces of the first panel and the second panel, and the second panel is adjusted to an inclined angle with the horizontal plane by the panel angle changing device, and then moved by the panel The device moves the second panel so that one side of the second panel is in contact with the first panel, and then adjusts the tilt angle to zero by the panel angle changing device So that the second panel is attached to the first panel in a horizontal plane; '' a pair of position devices, the first panel is moved by the level adjustment device, so that the first panel and the second panel are aligned with a predetermined phase At the corresponding position, an external force is then applied to compress the first panel and the second panel; an exposure device is provided with a light source to harden the photocurable adhesive to connect 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 554202 6. Patent application scope 1. A liquid crystal layer is used to display a picture and the color of the picture; two transparent substrates are used to sandwich the liquid crystal layer; wherein the three liquid crystal layers display red and blue respectively And three colors, and the three colors are combined into a plurality of colors, so that the liquid crystal display displays a colored daytime surface. 3. The panel stacking device described in item 2 of the scope of 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 described in item 2 of the scope of patent application, wherein the color liquid crystal display is a guest-host LCD. 5. The panel stacking device according to item 1 of the scope of patent application, wherein the light-hardening adhesive is a light-curing resin (UV adhesive). 6. The panel stacking device according to item 1 of the scope of the patent application, wherein the panel stacking device further comprises a vacuum machine, and before applying the photocurable adhesive, the light is hardened by a 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 in a straight strip shape on the surface of the panel. 554202 6. Scope of patent application 8. The panel stacking device described in item 1 of the scope of patent application, in which the panel angle changing device changes the angle between the second panel and the horizontal plane by more than 1 degree during bonding. 9. The panel stacking device according to item 1 of the scope of patent application, wherein the first panel includes a first alignment point, and the second panel includes a second alignment point, and the alignment device further includes an image. The capturing device is used to capture an image of the first pair of positions and an image of the second pair of positions. The first panel is moved by the level adjustment device to align the image of the first position and An image of the second alignment point. 10. The panel stacking device as described in 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-curing 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 (F 0ca 1 c nicte Xture), thereby 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; 554202 6. Apply for a patent on the surface of the first panel to apply a light-curable adhesive; 'Adjust a second panel to an inclined angle with the horizontal plane;. Move the second panel in a three-degree space direction so that the second panel One of the sides is in contact with the first panel; the tilt angle is adjusted to zero degrees so that the second panel fits the first panel with a horizontal plane; the first panel is moved horizontally so that the first panel and the first panel The two plates are aligned to a predetermined corresponding position; an external force is applied to press the first panel and the second panel together; the light-curable adhesive is hardened by a light source to join the first panel and the first panel Two panels. 12. The panel stacking method according to item 11 of the scope of patent application, wherein the liquid crystal display includes three panels, the panel includes: β a liquid crystal layer for displaying a daylight surface and the color of the daylight surface; Two transparent substrates are used to sandwich the liquid crystal layer; # Among them, 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 to make the liquid crystal display display a color. Screen. 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 554202 VI. Scope of patent application 1 4. The panel stacking method described in item 12 of the scope of patent application, wherein the color liquid crystal display is a guest-host 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 described in 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 during the bonding, the panel angle changing device changes the angle between the second panel and the horizontal plane by more than 1 degree. 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 554202 6. Scope of patent application Image of the registration site. 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 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 (F 0ca 1 c ο nicte X ture), thereby Causing a light emitted by the light source to pass through the liquid crystal layer uniformly; The light source is used to uniformly and comprehensively harden the photocurable glue. Page 22