CN1273853C - Panel stacking device and method for stacking liquid crystal display panels - Google Patents

Abstract

A panel stacking apparatus and method for stacking a plurality of panels when manufacturing a liquid crystal display. The apparatus includes a panel placing device for placing a first and a second panel of a plurality of panels. Horizontal adjusting device, horizontal migration panel placer. And the panel angle changing device changes the angle between the second panel and the horizontal plane. And the panel moving device moves the second panel in the three-dimensional space direction. The glue dispensing device is used for coating photo-hardening glue on two contact surfaces of the first panel and the second panel, the panel angle changing device is used for adjusting the inclination angle of the second panel and the horizontal plane, the panel moving device moves the second panel to enable one side of the second panel to be in contact with the first panel, and the panel angle changing device is used for adjusting the inclination angle to be zero degree to enable the second panel to be attached to the first panel by the horizontal plane. And the aligning device and the horizontal adjusting device move the first panel to align the two panels with the preset corresponding device, and apply external force to press the two panels. An exposure device for providing a light source to cure the photo-curing adhesive to bond the two panels.

Description

Panel stacking device and method for stacking liquid crystal display panels

technical field

The present invention relates to a panel stacking device and method. The panel stacking device is used to stack several panels contained in a liquid crystal display, especially to stack several panels of a color bistable liquid crystal display using a panel stacking device and method. panel.

Background technique

Today, with the rapid development of image processing technology, the development of display is also advancing rapidly. Liquid crystal display has the advantages of light weight and power saving, so liquid crystal display has become the mainstream of technological development.

The content of image information is becoming more and more complex, and liquid crystal displays are gradually developed to display color images. The imaging technology of color liquid crystal display, in addition to using color filters to form a color picture, especially for bistable liquid crystal display cholesteric liquid crystal display (Surface-Stabilized Cholesteric Texture; SSCT), or bistable liquid crystal display The guest-host LCD (Guest-Host LCD) can also use three panels to display colors. Each panel is sandwiched by two transparent substrates (Sandwiching) a liquid crystal layer. The three panels have corresponding red and blue colors respectively. Liquid crystal layers of three colors, green and green, and the liquid crystal layers are used to display the picture of the liquid crystal display and the picture of several colors combined by the three colors. Among them, the cholesteric liquid crystal display provides color by controlling the liquid crystal pitch (Pitch) of liquid crystal molecules in the liquid crystal layer, while the guest-host liquid crystal display provides color by adding dyes into the liquid crystal layer. Regarding the display of colors, if these color liquid crystal displays are cut with 8-bit grayscale, they can display a 512-color color screen. The bistable liquid crystal display with three panels displaying colors can especially be applied to equipment such as outdoor large billboards or e-books.

However, for the stacking technology of multiple panels, the known techniques often have the following disadvantages: the alignment deviation among the panels. When laminating two panels, air bubbles are generated between the panels. The light-curing glue hardens unevenly, so that the hue of the picture 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.

Contents 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 several panels of the liquid crystal display when manufacturing a liquid crystal display. In particular, using the panel stacking device can more accurately Several panels of a color bistable liquid crystal display are stacked without bubbles. Further improve the problem of uneven hue of image development caused by uneven curing of photocurable glue.

The panel stacking device of the present invention includes a panel placement device for placing the first panel and the second panel among 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 is used to change the angle between the second panel and the horizontal plane. A panel moving device moves the second panel in a three-dimensional space direction. A dispensing device for coating a photocurable glue on at least one of the two contact surfaces of the first panel and the second panel, and adjusting the second panel to form an inclined angle with the horizontal plane by the panel angle changing device, the inclination The angle exceeds at least 1 degree, 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 angle of inclination is adjusted to zero by the panel angle changing device so that the second panel is in contact with the first panel The horizontal plane is attached to the first panel. The alignment device is that the first panel is moved by the horizontal adjustment device, so that the first panel and the second panel are aligned at a predetermined corresponding position, and then an external force is applied to the first panel and the second panel Panel pressing. An exposure device provides a light source to harden the photocurable glue to join the first panel and the second panel. Especially when the liquid crystal display is the bistable liquid crystal display, a driving circuit is used to harden the photocurable glue at several predetermined positions by the light source before the light source hardens the photocurable glue, and then use The driving circuit forms 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 evenly, so that the photocurable glue can be uniformly cured.

The LCD display consists of three panels, each of which contains:

A liquid crystal layer is used to display a picture and the color of the picture;

Two transparent substrates are used to wrap the liquid crystal layer;

Wherein, the three liquid crystal layers respectively display three colors of red, blue and green, and the three colors are combined into several colors, so that the liquid crystal display displays a colorful picture.

The liquid crystal display is a color liquid crystal display, and the color liquid crystal display is a cholesteric liquid crystal display.

The liquid crystal display is a color liquid crystal display, and the color liquid crystal display is a guest-host type liquid crystal display.

The photocurable glue is a photocurable resin.

The panel stacking device further includes a vacuum machine, and before coating the light-curable glue, the air bubbles in the light-curable glue are drawn out by the vacuum state caused by the vacuum machine.

On at least one of the two contact surfaces of the first panel and the second panel, a straight strip of light-curable glue is coated.

When laminating, the panel angle changing device changes the angle between the second panel and the horizontal plane by more than 1 degree.

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 device for capturing an image of the first alignment point And the image of the second alignment point, the first panel is moved by the horizontal adjustment device to align the image of the first alignment point and the image of the second alignment point.

The liquid crystal display is a bistable liquid crystal display, and the panel stacking device further includes a driving circuit, and before the light source hardens the photocurable glue, only the light source is used to harden the photocurable glue at predetermined positions, and then The driving circuit is used to form an electric field to drive the liquid crystal layer into a mixed phase, so that the light emitted by the light source can uniformly pass through the liquid crystal layer, and then the light curable glue is uniformly and comprehensively cured by the light source.

A panel stacking method of the present invention is used to stack several panels of the liquid crystal display when manufacturing a liquid crystal display, and the panel stacking method comprises the following steps:

placing the first panel of the plurality of panels;

Coating a photocurable glue on the surface of the first panel;

adjusting the second panel to form an angle of inclination with the horizontal plane, the angle of inclination exceeds at least 1 degree;

moving the second panel in a three-dimensional direction such that one side of the second panel is in contact with the first panel;

Adjust the inclination angle to zero so that the second panel fits the first panel in a horizontal plane:

moving the first panel in the horizontal direction so that the first panel and the second panel are aligned at a predetermined corresponding position;

applying an external force to compress the first panel and the second panel;

using a driving circuit to form an electric field to drive the liquid crystal layer of the liquid crystal display into a hybrid phase; and

A light source is used to emit a light uniformly through the liquid crystal layer to harden the photocurable glue to join the first panel and the second panel.

Therefore, several panels included in the liquid crystal display are stacked by using the panel stacking device and method of the present invention. Thus, several panels of a color bistable liquid crystal display can be stacked more accurately and without air bubbles, and the liquid crystal layer is further driven into the hybrid phase by the driving circuit, so as to improve uneven curing caused by the photocurable glue. This results in the problem of uneven hue of the picture image.

Description of drawings

Fig. 1 is the schematic diagram of panel stacking device of the present invention;

Fig. 2 is a schematic top view of the horizontal adjustment device of the present invention;

Fig. 3 is the schematic diagram of alignment device;

Fig. 4 is the schematic diagram that the present invention makes photocurable glue uniformly harden;

Fig. 5 is a flow chart of the panel stacking method of the present invention; and

FIG. 6 is a flow chart of step S18 of the panel stacking method of the present invention.

Description of figure number

10 Panel stacking device 14 1st panel

16 Second Panel 18 Panel Placement Device

20 Horizontal adjustment device 22 Panel moving device

24 Panel Angle Changing Device 26 Dispensing Device

28 Image capture device 30 Lower suction cup

32 Upper suction cup 34 Coordinate X-axis adjuster

36 Coordinate Y-axis adjuster 38 Rotation adjuster

40 Monitoring screen 42 The first pair of positions

44 Second pair of positions 46 Exposure equipment

48 drive circuit 50 light

52 Transparent Substrate 54 Liquid Crystal Molecules

56 Photocurable glue 58 Liquid crystal layer

Detailed ways

As shown in FIG. 1 , FIG. 1 is a schematic diagram of a panel stacking device 10 of the present invention. For bistable liquid crystal displays such as color cholesteric liquid crystal displays (Surface-Stabilized Cholesteric Texture; SSCT) or guest-host liquid crystal displays (Guest-Host LCD), the bistable liquid crystal displays correspond to three panels Red, blue, and green liquid crystal layers are used to display color images, and each panel is formed by sandwiching a liquid crystal layer between two transparent substrates. Since there are several panels to be stacked, the present invention provides a panel stacking device 10 for stacking the 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 22 , a panel angle changing device 24 , a glue dispensing device 26 , and a positioning device.

First, the vacuum created by a vacuum machine draws air bubbles out of the photohardenable glue placed in a glue storage container. The light-curing glue is a light-curing resin (UV glue). Usually, the hardening glue absorbs the energy of light with a wavelength of 436nm, 365nm, or 254nm to completely harden and have the ability to glue the panel.

The panel placing device 18 is used for placing the first panel 14 and the second panel 16 among the several panels. The panel placing device 18 uses the lower suction cup 30 to absorb the first panel 14 .

Further referring to FIG. 2 , FIG. 2 is a schematic top view of the level adjustment device 20 of the present invention. The horizontal adjustment device 20 includes a coordinate X-axis adjuster 34, a coordinate Y-axis adjuster 36, and a rotation adjuster 38. The coordinate X-axis adjuster 34 is used to move the panel placement device 18 in the horizontal direction of the X-axis, The coordinate Y-axis adjuster 36 is used to move the panel placement device 18 in the horizontal direction of the Y axis, and the rotation adjuster 38 is to rotate the panel placement device 18 in the horizontal direction, thereby moving and adjusting the first panel 14 in the horizontal direction. Location. The panel angle changing device 24 uses an upper suction cup 32 to absorb the second panel 16 , 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 making the second panel 16 move in three dimensions. The glue dispensing device 26, on at least one of the two contact surfaces of the first panel 14 and the second panel 16, applies the photocurable glue on the surface of the panel in a straight strip. The glue dispensing device 26 is a programmable Control to control its dispensing position and glue output. The panel angle changing device 24 adjusts the second panel 16 to form an inclination angle with the horizontal plane, the inclination angle is at least more than 1 degree, and the non-horizontal contact between the first panel 14 and the second panel 16 avoids the generation of air bubbles. Then the second panel 16 is moved by the panel moving device 22 so that one side of the second panel 16 is in contact with the first panel 14, and then the angle of inclination is adjusted to zero by the panel angle changing device 24 so that the second panel 16 is horizontal to the first panel 14 Bonding, such a bonding method can expel air bubbles from the gap between the first panel 14 and the second panel 16 .

Further referring to FIG. 3 , FIG. 3 is a schematic diagram of the alignment device. The alignment device includes a monitoring screen 40 and an image capturing device 28 . The first panel 14 is moved by the level adjustment device 20 so that the first panel 14 and the second panel 16 are aligned to a predetermined corresponding position. Wherein the first panel 14 includes a first alignment point 42, the second panel 16 includes a second alignment point 44, and the image capture device 28 is used to capture the image of the first alignment point 42 and the second alignment point The image of point 44 is visually aligned through the monitor screen 40, and the first panel 14 is moved by the horizontal adjustment device 20 to align with the image of the first alignment point 42 and the image of the second alignment point 44. The position where the image of the alignment point 42 and the image of the second alignment point 44 are aligned with each other is the predetermined corresponding position. Usually the image capture device 28 is two charge coupled device (Charge Coupled Device; CCD) image sensing lenses, the first panel 14 has two first pairing points 42, which are diagonally distributed on the first panel 14, the second The second panel 16 also has two corresponding second alignment points 44, which are diagonally distributed on the second panel 16, and two charge-coupled device image sensing lenses capture a group of first and second alignment points 44 respectively. The image can be displayed on one or two monitor screens 40 for visual alignment.

Please refer to FIG. 4 . FIG. 4 is a schematic diagram of uniform curing of the light-curable glue 56 according to the present invention. The panel stacking device 10 further includes a pressing device and an exposure device 46 . The pressing device exerts an external force to press the first panel 14 and the second panel 16 together. Through pressing, the photocurable glue 56 between the first panel 14 and the second panel 16 can be evenly distributed. The exposure device 46 provides a light 50 to harden the photocurable glue 56 to join the first panel 14 and the second panel 16 . Wherein, before the light 50 hardens the pre-hardening glue 56, only a point light source is used to harden the light-curing glue 56 at several predetermined positions, and the area of several predetermined positions only occupies a small part of the panel area. This step is called The purpose of pre-fixing is to temporarily fix the first panel 14 and the second panel 16 . The panel stacking device 10 additionally includes a driving circuit 48, and then utilizes the driving circuit 48 to form an electric field, which can drive the arrangement of several liquid crystal molecules 54 in the liquid crystal layer 58 of the second panel 16. The liquid crystal layer 58 is formed by two The transparent substrate 52 is clamped. The bistable liquid crystal display has three kinds of arrangement modes of liquid crystal molecules 54 after being driven by an electric field, which are hybrid phase (Focal conic texture), planar phase (Planar texture), and homeotropic texture (Homeotropic texture), wherein the hybrid phase is a dark state The stable state, the planar phase is the bright stable state, and the vertical phase is the unstable state. After the electric field drives the liquid crystal layer 58 into a hybrid phase, since the irregular and stable liquid crystal molecules 54 of the hybrid phase are arranged, the light 50 emitted by the exposure device 46 can pass through the liquid crystal layer 58 uniformly due to scattering, and then the light is used to make the liquid crystal layer 58 uniform. The uniform and comprehensive hardening of the light-curable glue 56 not only makes the first panel 14 and the second panel 16 stick together, but also enables uniform display of images due to the uniform hardening of the light-curable glue 56 .

Please refer to FIG. 5 , which is a flow chart of the panel stacking method of the present invention. FIG. 5 is a stacking method of the panel stacking device 10 in FIG. 1 . For bistable liquid crystal displays such as color cholesteric liquid crystal displays (Surface-Stabilized Cholesteric Texture; SSCT) or guest-host type liquid crystal displays (Guest-Host; LCD), because several panels must be stacked, the present invention provides a A panel stacking method is used to stack a plurality of panels included in a liquid crystal display, and the panel stacking method includes the following steps:

Step S02: placing the first panel 14 among the several panels.

Step S04: The air bubbles in the photocurable glue are drawn out by a vacuum state caused by a vacuum machine.

Step S06 : Coating the photocurable glue on the surface of the first panel 14 in strips.

Step S08 : Adjusting a second panel 16 to form an inclination angle exceeding 1 degree with respect to the horizontal plane.

Step S10 : moving the second panel 16 in a three-dimensional direction, so that one side of the second panel 16 is in contact with the first panel 14 .

Step S12: Adjust the inclination angle to zero so that the second panel 16 is attached to the first panel 14 in a horizontal plane.

Step S14: moving 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. Wherein the first panel 14 includes a first alignment point 42, the second panel 16 includes a second alignment point 44, and an image capture device 28 is used to capture the image of the first alignment point 42 and the second alignment point 44. Two images of the alignment point 44, move the first panel 14 to align the image of the first alignment point 42 and the image of the second alignment point 44, the image of the first alignment point 42 and the second alignment point 44 The positions at which the images of are aligned with each other are the predetermined corresponding positions.

Step S16 : Apply an external force to press the first panel 14 and the second panel 16 together.

Step S18 : using a light source to harden the photocurable glue to join the first panel 14 and the second panel 16 .

Please refer to FIG. 6 , which is a flow chart of step S18 of the panel stacking method of the present invention. The above step S18 further includes the following steps: Step S20: use the light source to harden the photocurable glue at several predetermined positions, the area of several predetermined positions only occupies a small part of the panel area, this step is called pre-fixing, and the purpose is to The first panel 14 and the second panel 16 are temporarily joined and fixed.

Step S22: using a driving circuit to form an electric field to drive the liquid crystal layer into a Focalconic texture, so that a light emitted by the light source can uniformly pass through the liquid crystal layer.

Step S24 : Use the light to harden the light-curable adhesive evenly and comprehensively, so as to join the first panel 14 and the second panel 16 .

Therefore, several panels included in the liquid crystal display are stacked by using the panel stacking device 10 and the method of the present invention. Thus, several panels of the color bistable liquid crystal display can be stacked more accurately and without air bubbles, and the liquid crystal layer is further driven into the hybrid phase by the driving circuit, thereby improving the uneven curing caused by the photocurable glue. This results in the problem of uneven hue of the picture image. From the above detailed description of the preferred embodiments, it is hoped that the characteristics and spirit of the present invention can be described more clearly, and the scope of the present invention is not limited by the preferred embodiments disclosed above. On the contrary, the intention is to cover various changes and equivalent arrangements within the scope of the claimed patent scope of the present invention.

Claims (11)

1, a kind of panel stack device, this panel stack device are when making a LCD, are used for piling up several panels of this LCD, and this panel stack device comprises:

One panel apparatus for placing is in order to place first panel and second panel in these several panels;

One leveling device is to move this panel apparatus for placing with horizontal direction, moves this first panel with horizontal direction thus;

One panel angle modifier is in order to change the angle of this second panel and surface level;

One panel mobile device is to move this second panel with the three-dimensional space direction;

One point glue equipment, coating one photo-hardening glue on the minimum one side in two surface of contact of this first panel and this second panel, and adjust this second panel by this panel angle modifier and become an angle of inclination with surface level, this angle of inclination surpasses 1 degree at least, then move this second panel and consequently contact with this first panel on one side of this second panel, then adjust this angle of inclination and become zero degree so that this second panel to fit with surface level and this first panel by this panel angle modifier by this panel mobile device;

One contraposition device is to move this first panel by this leveling device, makes this first panel aim at a predetermined opposite position with this second panel, then applies an external force with this first panel and this second panel pressing;

One exposure sources provides a light source and makes this photo-hardening glue sclerosis, to engage this first panel and this second panel.

2, panel stack device as claimed in claim 1 is characterized in that, this LCD comprises three panels, and each panel comprises:

One liquid crystal layer is in order to show the color of a picture and this picture;

Two transparency carriers are in order to this liquid crystal layer of double team;

Wherein, these three liquid crystal layers show red, blue, green three kinds of colors respectively, and by synthetic several colors of these three kinds of color-set, make liquid crystal display displays go out colored picture.

3, panel stack device as claimed in claim 2 is characterized in that, this LCD is a colour liquid crystal display device, and this colour liquid crystal display device is a cholesteric lcd display.

4, panel stack device as claimed in claim 2 is characterized in that, this LCD is a colour liquid crystal display device, and this colour liquid crystal display device is to be the guest-host type LCD.

5, panel stack device as claimed in claim 1 is characterized in that, this photo-hardening glue is ray hardening resin.

6, panel stack device as claimed in claim 1 is characterized in that, this panel stack device comprises a vacuum machine in addition, and before this photo-hardening glue of coating, the vacuum state by this vacuum machine causes detaches the bubble in this photo-hardening glue.

7, panel stack device as claimed in claim 1 is characterized in that, on the minimum one side in two surface of contact of first panel and second panel, and coating vertical bar shape photo-hardening glue.

8, panel stack device as claimed in claim 1 is characterized in that, during applying, the angle that this panel angle modifier changes this second panel and surface level surpasses 1 degree.

9, panel stack device as claimed in claim 1, it is characterized in that, this first panel comprises one first loci, this second panel comprises one second loci, this alignment device comprises an image capture unit in addition, be in order to the image that captures this first loci and the image of this second loci, move this first panel with the image of aiming at this first loci and the image of this second loci by this leveling device.

10, panel stack device as claimed in claim 2, it is characterized in that, this LCD is to be a bistable state LCD, this panel stack device comprises one drive circuit in addition, before this light source makes this photo-hardening glue sclerosis, only utilize this light source to make the photo-hardening glue sclerosis in several precalculated positions, then utilize this driving circuit to form an electric field, so that being driven into one, this liquid crystal layer mixes phase, the light that this light source is sent can evenly pass through this liquid crystal layer, then utilizes this light source that this photo-hardening glue evenly and is comprehensively hardened.

11, a kind of panel stacking method is when making a LCD, is used for piling up several panels of this LCD, and this panel stacking method comprises the following step:

Place first panel in these several panels;

Surface coated one photo-hardening glue in this first panel;

Adjust second panel and become an angle of inclination with surface level, this angle of inclination surpasses 1 degree at least;

Move this second panel with the three-dimensional space direction, so that one side of this second panel contacts with this first panel;

Adjusting this angle of inclination becomes zero degree so that this second panel to fit with surface level and this first panel;

Move this first panel with horizontal direction, make this first panel aim at a predetermined opposite position with this second panel;

Apply an external force with this first panel and this second panel pressing;

Utilize one drive circuit to form an electric field, be driven into one with liquid crystal layer and mix phase this LCD; And

Utilize a light source to send a light, make this photo-hardening glue sclerosis, to engage this first panel and this second panel evenly by this liquid crystal layer.

Images