TWI487980B - A display panel for improving to laminate a polarizer - Google Patents

Description

Display panel for improving polarizer attachment

The present invention relates to a flat panel display device, and more particularly to improving adhesion of a polarizer to a substrate in the manufacture of a flat panel display device, and reducing the generation of attached air bubbles.

In recent decades, displays have grown rapidly. From the original cathode ray tube (CRT), to the most common liquid crystal display (LCD), and developed a forward-looking organic light-emitting display (Organic Light-emitting Display). OLED), obviously, flat panel displays have become the dominant development in the display field. From the development of liquid crystal displays, it has also experienced different technical stages: the original Twisted Nematic (TN) liquid crystal display has a lower performance than the conventional cathode ray tube (CRT). The advantage of energy consumption gradually began to seize the dominant position of CRT in the market. However, the TN liquid crystal display has a narrow viewing angle. In many life experiences of consumers, such as home theaters, game devices, etc., there are still many spaces for improvement in performance. A liquid crystal display based on wide viewing angle technology was born, such as Multi-domain Vertical Alignment (MVA) liquid crystal display, In-plane Switching (IPS) liquid crystal display, and edge switching type. (Fringe Field Switching, FFS) liquid crystal display, etc.

We know that although the display technology of LCD is now more and more mature and has many types, its basic principle and basic structure are not much different. Referring to FIG. 1 , the main structure of the LCD display panel 10 includes: a color filter (CF) substrate 100a as an upper substrate and a Thin Film Transistor (TFT) array substrate as a lower substrate. 100b is oppositely disposed, the liquid crystal layer 130 is sandwiched between the CF substrate and the TFT array substrate, the sealant 120 seals the liquid crystal layer 130, and the CF substrate 110a and the TFT array substrate 110b are bonded; the outer surface of the CF substrate 100a is attached with polarized light. In the sheet 110a, the outer surface of the TFT array substrate 100b is attached to the lower polarizer 110b. Normally, the incident light emitted from the backlight passes through the lower polarizer 110b on the TFT array substrate side, the TFT array substrate 100b, the liquid crystal layer 130, the CF substrate 100a, and the upper polarizer 110a on the CF side substrate side. The upper polarizer 110a and the lower polarizer 110b are attached to the effective display area (AA) of the display panel 10. When the external signal voltage is driven, the liquid crystal molecules in the liquid crystal layer are deflected, and the light penetrating from the backlight side is selectively transmitted, and the finally displayed picture is received by the user. In terms of the display effect, in addition to the liquid crystal molecules that are twisted toward the polarization of the light and the color filters that function to add color, there are elements that contribute significantly to the contrast of the display screen and the color gray scale, that is, the polarizers. The polarizer has a characteristic of penetrating light of a specific polarization direction and absorbing light of other polarization directions, and when it is applied to a liquid crystal display device, a continuous change of light intensity and gray scale is ensured. In the liquid crystal display panel, polarizers that are polarized to each other are attached to the substrates on both sides. In the normal white mode, when a sub-pixel is turned on, if there is no signal voltage, the liquid crystal molecules are arranged in the alignment direction, and the incident light passing through the side of the TFT array substrate is twisted by the liquid crystal molecules, and the polarization direction thereof changes. In order to be the same as the polarizing direction of the polarizer on the CF substrate side, it is not absorbed by the polarizer on the CF substrate side, and the light intensity is the strongest at this time. If there is a signal voltage, for example, the liquid crystal molecules are subjected to an electric field and stand, and the standing angle is perpendicular to the substrate. In this case, The incident light on the side of the TFT array substrate is not twisted by the liquid crystal molecules, and its polarization direction is constant. When passing through the polarizer of the CF substrate side, it is all absorbed, and the light intensity is the weakest. The two kinds of light intensity values are two gray scale extreme values of a sub-pixel, that is, the change process from all white to all black is essentially a process of light intensity, as long as the liquid crystal molecules are adjusted according to the external signal. In the steering, the incident light that has been filtered from the polarizer of the TFT array substrate side is guided to the polarizer of the CF substrate side to a different extent, and various light intensities can be obtained. If you assign a sub-pixel to a filter of a specific color, the corresponding color will be displayed. At present, a pixel in a conventional liquid crystal display panel usually includes three sub-pixels similar to the above, and each of them is matched with three kinds of filters of red, green and blue, so the three colors are mixed by different light intensities. More colors will be derived, that is, the gray scale will increase. It can be seen that the polarizer plays an important role in the gradation of light intensity and the display of gray scale.

Please refer to FIG. 3 again. FIG. 3 is a schematic diagram of a general structure of a polarizer. The core element polarizing layer 1101 of the polarizer 110 determines the polarizing performance and transmittance of the polarizer, and also affects the color tone and optical durability of the polarizer. The material of the polarizing layer 1101 is polyvinyl alcohol (PVA), and due to its easy water absorption and fading, the polarizing performance is lost, and a layer of cellulose triacetate (TAC) having good optical uniformity and good light transmittance is used on both sides of the polarizing layer 1101. The layer 1102 is protected from moisture and air to protect the polarizing layer 1101. The polarizing layer 1101 and the TAC layer 1102 located on both sides together form a polarizer original. Further, the polarizer should have different functional requirements, and various types of polarizers can be made. For example, a birefringent optical compensation film is composited on the original polarizer, and the STN polarizer can be formed; the light is combined on the original polarizer. The turning film can be made into a wide viewing angle polarizer or a narrow viewing angle polarizer; if the original polarizer is colored, a color polarizer can be obtained. Referring to FIG. 3, the polarizer 110 is to be attached to the substrate, and a TAC layer 1102 on one side thereof is coated with a layer of adhesive (not shown). The adhesive has strong adhesion to the substrate Degree also determines the quality of the polarizer. A release film layer (not shown) is provided on one side of the adhesive to protect the layer of adhesive (not shown). A protective layer 1103 is used on the other side of the TAC layer 1102 to protect the entire polarizer.

Therefore, the adhesion quality of the polarizer plays an important role in the display of the screen. If the adhesive and the substrate are not well bonded, bubbles are easily generated, which directly affects the performance of the polarizer. However, the actual attachment is impossible to achieve perfection. When the polarizer is attached to the substrate, a certain amount of tiny bubbles are inevitably left, which is not observed by the naked eye. The presence of bubbles refracts light and ultimately affects the display. Defoaming equipment, such as autoclaves, are often used in the industry for further processing to eliminate air bubbles. The treatment conditions are at least two atmospheres, the temperature is between 50 and 100 ° C, and the treatment is about 30 minutes. The principle is to soften the adhesive used when attaching the polarizer, so that the bubbles are more likely to flow inside the gas, and the bubbles are excluded under the external pressure. However, such bubbles are mostly caused by the process factors of the surface, such as the attachment environment, the attachment process or the attachment method. However, if defects are generated on the substrate, such as depressions, resulting in the generation of bubbles, it is not as easy to handle as the conventional bubble generation, and even if it is processed by the autoclave, it has a good effect. It does not substantially solve the bubble problem, and there is the possibility of recurring bubbles unless the depression on the substrate is eliminated.

In the conventional liquid crystal display manufacturing process, there are generally the following steps: (1) forming a mother substrate of a TFT array substrate and a mother substrate of a CF substrate through two large-area substrates, such as a 1200×1300 mm2 glass substrate; (2) Cleaning the substrate; (3) coating the alignment film on the substrate and rubbing the alignment so as to have a pretilt angle of the driven liquid crystal molecules; (4) coating the sealant region on the mother substrate side of the TFT array substrate; (5) injecting the liquid crystal (6) bonding the mother substrate of the TFT array substrate and the mother substrate of the CF substrate, and (7) splitting, according to the number of frame glue to obtain a plurality of display panel units, that is, the smallest unit to be used as a finished product; (8) edging, processing the sharp edges generated on the display panel, sharp corners (b) thinning, further reducing the thickness of the substrate; (10) attaching a polarizer; (11) module assembly. As can be seen from the above, before the polarizer is attached, the TFT array substrate and/or the CF substrate are fabricated, lobed, and edging in various processes, and even in the process of transferring the substrate, the surface of the thin substrate is liable to be damaged. This results in a recess 101 as in Figure 2a, which is a plan view of the substrate in which the recess is present. A recess 101a and a recess 101b are formed on the surface of the substrate 100 shown in FIG. 2a (the recesses 101a, 101b in the figure are merely schematic and do not represent the true size), but please refer to FIG. 2b again, and FIG. 2b is the interface along the AA line in FIG. 2a. In the figure, the depth of the recess 101b in FIG. 2 is generally 20 μm or more, and is generally much larger than the depth of the recess 101a (the depth is 20 μm or less), which is not allowed for the yield. Further, as shown in Fig. 2c, the polarizer 110 in the recessed position is partially in contact with the substrate 100, and a part of the gas remains between them. When under certain conditions, a large bubble 111 is generated, as shown in Fig. 2d, the bubble is even visible to the naked eye, and has a great influence on the polarizer.

Therefore, by treating the bubbles generated by the depression of the substrate by the autoclave, the effect of eliminating the bubbles can be achieved. After the bubbles in the depression are discharged, the polarizer will be trapped to some extent under the external pressure, once again. Affect the performance of polarizers. However, the industry often lacks considerations for this type of bubble generation and lacks a substantial solution. Moreover, because of the presence of the depression on the substrate, the polarizer can never make good contact with the substrate. If the bubble occurs again in the subsequent detection, the autoclave treatment will be performed again until it is qualified. It is conceivable that if the cycle is processed repeatedly, not only the manufacturing cost is increased, but also the production time is increased. Therefore, it is not fundamentally solved by simply processing it through the autoclave. Therefore, it is necessary to find a way to substantially solve the problem of bubble generation and improve the adhesion effect of the polarizer. Solved technical problems.

In addition, the polarizer is not only used for the display of the LCD, but the OLED also requires the aid of the polarizer. Most OLED products are attached with polarizers to provide anti-glare function, which enhances the contrast of OLEDs under strong light and reduces the interference caused by strong light. Therefore, as long as the polarizer is attached, it is necessary to consider the problem that the polarizer is attached to the bubble.

To solve the above problems in the prior art, the present invention provides a display panel including an upper substrate, a lower substrate, a sealant, a polarizer, and a filling layer. The upper substrate is disposed opposite to the lower substrate, and one of the outer sides of the substrate has more than one recess. The sealant is located between the upper substrate and the lower substrate and is used for bonding. The polarizer is disposed on one side of the upper substrate and/or the outer side of the lower substrate; the filling layer is disposed between the polarizer and the upper substrate and/or between the polarizer and the lower substrate to fill the upper substrate and/or A depression on the substrate.

In an embodiment of the invention, the material of the filling layer is selected from a pressure sensitive adhesive.

In an embodiment of the invention, the pressure sensitive adhesive has a thickness of about 20 to 100 um.

In an embodiment of the invention, the pressure sensitive adhesive contains transparent conductive particles.

In an embodiment of the invention, the concentration of the transparent conductive particles in the pressure sensitive adhesive is 50 to 80%.

In an embodiment of the invention, the transparent conductive particles have a diameter of about 5 to 15 um.

In an embodiment of the invention, the transparent conductive particles are made of indium tin oxide.

In an embodiment of the invention, the material of the pressure-filled flat layer is selected from the group consisting of self-assembled molecular films.

In an embodiment of the invention, the self-assembled molecular film has a thickness of about 5 to 100 um. .

In an embodiment of the invention, the self-assembled molecular film is dried at about 30 to 120 °C.

In one embodiment of the invention, the self-assembling molecular film forms a solution having a concentration of about 10 to 15% active molecules.

In one embodiment of the invention, the active molecule is selected from one of an organodecane derivative and an organodecane derivative.

In an embodiment of the invention, the organodecane derivative is selected from the group consisting of trichlorodecane.

In an embodiment of the invention, the organodecane derivative is selected from the group consisting of trichlorodecane.

In an embodiment of the invention, the active molecule is selected from the group consisting of hydroxyl active molecules.

In an embodiment of the invention, the hydroxyl active molecule is selected from the group consisting of p-nitrophenol, m-nitrophenol, o-nitrophenol, p-fluorophenol, m-fluorophenol, o-fluorophenol and ethanol. .

In an embodiment of the invention, the active molecule is selected from the group consisting of a hydrogenthio group-based active molecule.

In one embodiment of the present invention, the above-mentioned hydrogenthio group-based active molecule is selected from the group consisting of thiophenol, 2-naphthylthiol, isophthalodithiol, phthalyldithiol, 1,6-hexanedithiol, 1 One of 8-octyl dithiol and 1,9-decyl dithiol.

In an embodiment of the invention, the active molecule is selected from the group consisting of nifedipine.

In an embodiment of the invention, the upper substrate and the lower substrate are selected from one of a glass substrate, a plastic substrate, and a metal substrate.

In an embodiment of the invention, after the thin film transistor is fabricated, a protective layer and a pixel electrode are sequentially formed to form a thin film transistor array substrate.

10, 20, 30, 40, 50‧‧‧ display panels

100‧‧‧Substrate

100a, 200a, 300a, 400a, 500a‧‧‧ upper substrate

100b, 200b, 300b, 400b, 500b‧‧‧ lower substrate

101, 101a, 101b, 201, 301, 401, 501‧‧ ‧ hollow

110‧‧‧ polarizer

110a, 210a, 310a, 410a‧‧‧Upper polarizer

110b, 210b, 310b, 410b, 510b‧‧‧ lower polarizer

111‧‧‧ bubbles

120, 220, 320, 420, 520‧‧‧ box glue

130, 230, 330, 430‧‧‧ liquid crystal layer

240, 340‧‧‧ pressure sensitive adhesive

440‧‧‧Self-assembled molecular film layer

550‧‧‧ cathode

560‧‧‧Lighting layer

570‧‧‧Anode

1101‧‧‧ polarizing layer

1102‧‧‧ cellulose acetate triacetate layer

1103‧‧‧Protective layer

1 is a schematic structural view of an LCD display panel; FIG. 2a is a plan view of a substrate having a recess; FIG. 2b is a cross-sectional view of the substrate taken along line AA of FIG. 2a; and FIG. 2c is a schematic view of the polarizer attached to the recessed substrate 2d is a schematic view of the polarizer producing the attached bubble; FIG. 3 is a general structural diagram of the polarizer; FIG. 4 is a general flow chart of attaching the polarizer; FIG. 5 is a schematic view of the first embodiment of the present invention; Figure 6 is a schematic view of a second embodiment of the present invention; Figure 7a is a schematic view of a ruthenium-oxygen covalent bond adsorbed on a glass substrate; and Figure 7b is a schematic view of a carboxylic acid-aluminum ion bond adsorbed on an alumina substrate; 7c is a schematic view of a sulfur-gold ion bond adsorbed on a gold substrate; FIG. 8 is a schematic view of a third embodiment of the present invention; FIG. 9 is a flow chart of a step of adsorbing a self-assembled molecular film on a substrate; and FIG. 10 is an OLED display Schematic diagram of the structure of the panel.

The present invention is not limited by the scope of the invention, but the scope of the invention is not limited thereto. Please note that this part mainly describes the LCD panel as an example, but similar products such as OLED panels that need to be attached to the polarizer are also within the scope of the present invention. this In the embodiment of the invention, the depressions having a depth of more than 20 um are mainly taken as an example, and the depressions having a depth of less than 20 um are not excluded. Since the invention is substantially the same and avoids the cumbersome description, it is omitted. The words "upper", "between", etc., which appear in the specification, are not limited to direct contact between elements. The faces of the two substrates are referred to as the "inner side faces" of the corresponding substrates, and the faces of the two substrates not facing each other are referred to as the "outer sides" of the corresponding substrates. The term "about" as defined before the numerical value means that the range of values may exceed 5% of the maximum or minimum of the interval shown.

Embodiment 1

Referring to FIG. 5, the LCD display panel 20 includes an upper substrate 200a (CF substrate), a lower substrate 200b (TFT array substrate), a sealant 220, a liquid crystal layer 230, a pressure sensitive adhesive 240, an upper polarizer 210a, and a lower polarized light. a sheet 210b, wherein the inner side of the lower substrate 200b is provided with a sealant 220. A liquid crystal layer 230 is disposed in a region surrounded by the sealant 220, and then adhered by the inner side of the upper substrate 200a via the sealant 200. The upper substrate 200a and the lower substrate 200b are disposed opposite to each other, and the upper substrate 200a, the lower substrate 200b, and the sealant 220 are sealed to the liquid crystal layer 230. Next, the upper polarizer 210a is attached to the outer side surface of the upper substrate 200a through the pressure sensitive adhesive 240, and the lower polarizer 210b is attached to the outer side surface of the lower substrate 200b through the pressure sensitive adhesive 240. However, for some reason, some recesses 201 appear in the upper substrate 200a and/or the lower substrate 200b, for the following reasons:

Before the formation of the liquid crystal cell, (1) the process temperature or the necessary baking, the glass substrate is prone to stress, and there is a problem of uneven stretching in a local area, thereby burying the surface of the glass substrate to cause damage, and some even Direct peeling, resulting in depression. (2) Handling, when the glass substrate is transported in a plurality of chambers, the mutual contact with the transport carrier or the contact between the glass substrates, even if the contact is slight, it is inevitable Causes a depression.

After the liquid crystal cell is formed, the risk of dents is increased, such as: (1) lobes. When the process is to manufacture a dicing gap, the device acts on the glass substrate, and mechanical vibrations which are difficult to avoid may cause the generation of dents. (2) Edge grinding, contact between the glass substrate and the grinding wheel, unavoidable mechanical vibration, which may result in the generation of depressions. (3) Thinning, the upper and lower surfaces of the entire display panel are most likely to be in contact with the grinding wheel, resulting in maximization of the depression. (4) Handling, mutual contact with the transport carrier or contact between the glass substrates, even if the contact is slight, it will inevitably lead to depression.

For the treatment of the depression, in this embodiment, an adhesive having a certain thickness is selected, and the material thereof may be selected from a pressure sensitive adhesive 240 (Pressure Sensitive Adhesive, PSA), and the thickness thereof is about 20 to 100 um, and the optimum is 40 to 50 um. . Before the polarizer is attached, the upper substrate 200a and the lower substrate 200b are mainly bonded together by the sealant 220, and the liquid crystal layer 230 is sealed. Then, the specific attaching step is as follows: FIG. 4: Firstly, the outer side surface S11 of the upper and lower substrates of the panel is cleaned, wherein the upper substrate 200a and the lower substrate 200b as shown in FIG. 5 have been pasted through the sealant 220 and sealed. The liquid crystal layer 230 is attached; then the first polarizer S12 is attached, one side of the panel is selected (the outer side surface of the upper substrate 200a), the release film of the first polarizer is removed, and the panel AA area is aligned. The side is gradually attached to the other side; then the first roller presses S13 to appropriately increase the adhesive strength of the pressure sensitive adhesive and fill the recess; finally attaching the second polarizer S14 to the other side of the panel ( The outer side surface of the lower substrate 200b tears off the release film of the second polarizer, aligns the panel AA area, and gradually attaches to the other side from one side thereof; finally, the second roller presses S15 to play Appropriately increase the adhesive strength of the pressure sensitive adhesive and fill the recess. Please refer back to the structure shown in Figure 5 for the attached effect. In the entire attaching process of the pressure sensitive adhesive 240, first, by the pressure of the roller, the pressure sensitive adhesive 240 can fully fill the full recess 201, Because the pressure sensitive adhesive 240 is thick enough; secondly, the pressure sensitive adhesive 240 is a semi-solid soft rubber which can be finally laid flat between the upper substrate 200a and the upper polarizer 210a and between the lower substrate 200b and the lower polarizer 210b. . The substrate used in the embodiment may be a plastic substrate or a metal substrate, in addition to the glass substrate. Subsequently, the attached polarizer and another autoclave treatment will further strengthen the bond strength between the polarizer and the substrate. The depression is fundamentally eliminated, and the secondary bubbles are not easily generated, ensuring enhancement. The performance of the polarizer.

Embodiment 2

The panel types of LCDs have been developed since the beginning, and various technologies have been contending with each other. However, from the main direction of development, more is invested in a wide range of technology. Today, the level steering drive of liquid crystal molecules is currently the best mode. These models currently have two types of IPS and FFS, which are wide viewing angle technologies. This type of LCD is not expected to be disturbed by external electromagnetic fields because of its uniqueness in driving at a positive level, otherwise the wide viewing angle effect is greatly reduced. In this regard, the industry often uses an additional backside ITO process to mask external electromagnetic fields. But this increases the manufacturing cost accordingly.

Please refer to FIG. 6 , wherein the LCD display panel 30 includes an upper substrate 300 a (CF substrate), a lower substrate 300 b (TFT array substrate), a sealant 320 , a liquid crystal layer 330 , a pressure sensitive adhesive 340 , an upper polarizer 310 a , and a lower polarized light . a sheet 310b, wherein the inner side of the lower substrate 300b is provided with a sealant 320. A liquid crystal layer 330 is disposed in a region surrounded by the sealant 320, and then the inner side of the upper substrate 300a is pasted by the sealant 300. The upper substrate 300a and the lower substrate 300b are disposed opposite to each other, and the upper substrate 300a, the lower substrate 300b, and the sealant 320 are sealed to the liquid crystal layer 330. The upper polarizer 310a is attached to the outer side surface of the upper substrate 300a through the pressure sensitive adhesive 340, and the lower polarizer 310b is passed through the pressure sensitive adhesive. 340 is attached to the outer side surface of the lower substrate 300b. However, for some reason, some recesses 301 appear in the upper substrate 300a and/or the lower substrate 300b, for the following reasons:

Before the formation of the liquid crystal cell, (1) the process temperature or the necessary baking, the glass substrate is prone to stress, and there is a problem of uneven stretching in a local area, thereby burying the surface of the glass substrate to cause damage, and some even Direct peeling, resulting in depression. (2) Handling, when the glass substrate is transported in a plurality of chambers, the mutual contact with the transport carrier or the contact between the glass substrates, even if the contact is slight, inevitably causes a depression.

After the liquid crystal cell is formed, the risk of dents is increased, such as: (1) lobes. When the process is to manufacture a dicing gap, the device acts on the glass substrate, and mechanical vibrations which are difficult to avoid may cause the generation of dents. (2) Edge grinding, contact between the glass substrate and the grinding wheel, unavoidable mechanical vibration, which may result in the generation of depressions. (3) Thinning, the upper and lower surfaces of the entire display panel are most likely to be in contact with the grinding wheel, resulting in maximization of the depression. (4) Handling, mutual contact with the transport carrier or contact between the glass substrates, even if the contact is slight, it will inevitably lead to depression.

For the treatment of the depression, in this embodiment, an adhesive having a certain thickness is selected, and the material thereof may be selected from a pressure sensitive adhesive, and the thickness needs to be about 20 to 100 um, preferably 30 to 50 um. In particular, the pressure sensitive adhesive is uniformly doped with conductive particles having a concentration of about 50 to 80% and a size of about 5 to 15 um or a conductive gel, and the doped material may be selected from Indium Tin Oxide (ITO) particles. Before the polarizer is attached, the upper substrate 300a and the lower substrate 300b are mainly bonded together by the sealant 320, and the liquid crystal layer 330 is sealed. Then, the specific attaching step is as shown in FIG. 4: firstly, the outer side surface S11 of the upper and lower substrates of the panel is cleaned, wherein the upper substrate 300a and the lower substrate 300b as shown in FIG. 6 have been pasted through the sealant 320 and sealed. The liquid crystal layer 330 is good; then the first polarizer S12 is attached, and one side of the panel is selected ( The outer side surface of the upper substrate 300a is peeled off, and the release film of the first polarizer is removed, aligned with the AA area, and gradually attached to the other side from one side; then the first roller is pressed with S13 to properly Increasing the adhesive strength of the pressure sensitive adhesive and filling the recess; finally attaching the second polarizer S14, the other side of the panel (the outer side of the lower substrate 300b), and tearing off the release film of the second polarizer Aligned with the AA area, gradually attached to the other side from one side; the second roller applies pressure S15 to appropriately increase the adhesive strength of the pressure sensitive adhesive and fill the recess. Please refer back to the structure shown in Figure 6 for the attached effect. In the entire attaching process of the pressure sensitive adhesive 340, first, by the extrusion of the roller, the pressure sensitive adhesive 340 can fully fill the full recess 301 because the pressure sensitive adhesive 340 is thick enough; second, the pressure sensitive adhesive 340 is a half. The solid-state soft rubber may be finally laid flat between the upper substrate 300a and the upper polarizer 310a or between the lower substrate 300b and the lower polarizer 310b. For LCD-driven LCDs, the incorporation of ITO particles 341 prevents interference from external electric fields. The ITO fine particles 341 are transparent themselves, do not affect the transmission of incident light from the back side, and have a certain hardness, and can maintain the distance between the upper polarizer 310 and the upper substrate 300a, the lower polarizer 310, and the lower substrate 300b for a long time. The substrate used in the embodiment may be a plastic substrate or a metal substrate, in addition to the glass substrate. Subsequently, in the attached polarizer, and then an autoclave treatment, the bonding strength between the polarizer and the substrate is further enhanced, and the depression is fundamentally eliminated, and the secondary bubbles are not easily generated, thereby ensuring reinforcement. The performance of the polarizer. It is worth mentioning that the use of a certain amount of transparent conductive particles or conductive gel directly in the pressure sensitive adhesive used in the embodiment can also achieve the purpose of shielding the external electromagnetic field interference, thereby achieving the reduction of the polarizer. While attaching bubbles, it also saves a process and saves production costs.

Embodiment 3

With the development of modern technology, newer and better materials are gradually being developed. Currently One of them is the self-assembled molecular film that has attracted much attention. Self-assembled Monolayers (SAMs) are ordered supramolecular systems formed by spontaneous adsorption of active molecules on heterogeneous interfaces through chemical bonds. They have good thermodynamic stability, high degree of order, and good contact with carriers. strength. It can be transferred from the solution after film formation, and it is currently the most important organic ultra-thin film technology. Depending on the SAMs and the carrier, there are roughly the following chemical bonds: (1) The organodecane derivative is formed on the hydroxylated surface, as shown in Figure 7a, in combination with the glassy support. (2) The carboxylate compound is formed on the surface of the metal oxide, and the combination of the fatty acid (CnH2n+1COOH) and the alumina (Al2O3) carrier is shown in Fig. 7b. (3) The thiol compound is formed on the surface of the metal, and the combination of the thiol compound (H(CH2)nSH) and the gold (Au) carrier as shown in Fig. 7c. Among them, the organic decane derivative can be applied to a metal oxide and a metal carrier in addition to the above-described combination with a glass substrate.

So far, SAMs have been found to be able to adsorb on specific carriers. R&D personnel have gradually discovered that SAMs can be used in the following fields, such as: (1) preventing the surface of metal carriers from being corroded, because the self-assembled molecular film is denser and inhibited. Oxygen penetration; (2) Photosensitive molecular material can be used to make photoresist; (3) Optical system manufacturing, combined with micron transfer technology, can be used to cut metal wire by micron transfer technology. (4) forming a specific pattern directly on the surface of the carrier, depending on the action of different functional groups in the active molecule on different planes to produce SAMs having a specific pattern; (5) hardening of the surface of the carrier, which can be applied to micron transfer technology, The SAMs of the class can print the desired pattern neatly on the substrate in a non-holonomic plane without distorting the original design pattern.

Please refer to FIG. 8 , wherein the LCD display panel 40 includes an upper substrate 400 a (CF substrate), a lower substrate 400 b (TFT array substrate), a sealant 420, a liquid crystal layer 430, and a SAMs layer. 440, a pressure sensitive adhesive (not shown), an upper polarizer 410a, and a lower polarizer 410b. The inner side of the lower substrate 400b is provided with a sealant 420, and a liquid crystal layer 430 is disposed in a region surrounded by the sealant 420. Then, the inner surface of the upper substrate 400a is bonded by the sealant 400. The upper substrate 400a and the lower substrate 400b are oppositely disposed, so that the upper substrate 400a, the lower substrate 400b and the sealant 420 are sealed with liquid crystal. Layer 430. Next, the upper polarizer 410a is attached to the outer side surface of the upper substrate 400a through the SAMs layer 440 and a pressure sensitive adhesive (not shown), and the lower polarizer 410b is attached via the SAMs layer 440 and a pressure sensitive adhesive (not shown). On the outer side of the lower substrate 400b. However, for some reason, some recesses 401 appear in the upper substrate 400a and/or the lower substrate 400b, for the following reasons:

Before the formation of the liquid crystal cell, (1) the process temperature or the necessary baking, the glass substrate is prone to stress, and there is a problem of uneven stretching in a local area, thereby burying the surface of the glass substrate to cause damage, and some even Direct peeling, resulting in depression. (2) Handling, when the glass substrate is transported in a plurality of chambers, the mutual contact with the transport carrier or the contact between the glass substrates, even if the contact is slight, inevitably causes a depression.

After the liquid crystal cell is formed, the risk of dents is increased, such as: (1) lobes. When the process is to manufacture a dicing gap, the device acts on the glass substrate, and mechanical vibrations which are difficult to avoid may cause the generation of dents. (2) Edge grinding, contact between the glass substrate and the grinding wheel, unavoidable mechanical vibration, which may result in the generation of depressions. (3) Thinning, the upper and lower surfaces of the entire display panel are most likely to be in contact with the grinding wheel, resulting in maximization of the depression. (4) Handling, mutual contact with the transport carrier or contact between the glass substrates, even if the contact is slight, it will inevitably lead to depression.

According to the foregoing SAMs, the characteristics of the non-complete planar pattern can be neatly transferred onto the substrate, and it can be said that the SAMs can be used to repair the non-complete plane and fill the depression. This embodiment This feature is used to reduce the attached air bubbles of the polarizer. In view of the wider use of organic anthracene derivatives, this example mainly describes such active molecules. Please refer to the flow chart of manufacturing SAMs on the glass substrate as shown in FIG. 9 , which is described as follows: firstly, the panel S21 is immersed and fully immersed in a SAMs solution having a concentration of 10 to 15 wt %, wherein the active material may be selected from the group consisting of organic hydrazine. A substance such as trichloromethane. Of course, it can also be selected from organic hydrazine derivatives formed by bismuth of the same family, such as trichloromethane, etc.; then, the panel S22 is cleaned to wash impurities; finally, the panel S23 is dried, such as a temperature of 30 to 120 ° C, preferably 50~ The SAMs film layer was cured at 70 °C. Here, depending on the concentration of the active molecular solution, a SAMs layer 440 having a thickness of 5 to 100 um, preferably 10 to 50 um, may be formed on the outer surfaces of the upper substrate 400a and the lower substrate 400b of the LCD panel, and the order is good. The flat and dense, so the recess 401 is fully repaired, please refer to the structure shown in FIG. 8 again. Then, in the polarizer attaching method according to the first embodiment or the second embodiment, the upper polarizer 410a and the lower polarizer 410b may be attached to the SAMs layer 440. The substrate in this embodiment may be a metal substrate in addition to the glass substrate, and the active molecular material corresponding to the metal substrate may be mainly selected from a hydroxyl-based active molecule and a hydrogen-sulfide-based active molecule. Wherein, the hydroxyl active molecule may be selected from the group consisting of: p-nitrophenol (O2NC6H4OH), m-nitrophenol (O2NC6H4OH), o-nitrophenol (O2NC6H4OH), p-fluorophenol (FC6H4OH), m-fluorophenol (FC6H4OH), O-fluorophenol (FC6H4OH) and ethanol (C2H6O) and other components. The thiol group-based active molecule may be selected from the group consisting of thiophenol (C6H6S), 2-naphthylthiophenol (C10H8S), isophthalodithiol (C6H6S2), phthalyldithiol (C6H6S2), 1,6-hexane. Components such as dithiol (C6H14S2), 1,8-octyl dithiol (C8H18S2) and 1,9-nonyl dithiol (C9H2OS2). Further, the active molecule may also be selected from the group consisting of nifedipine (O2NC6H5).

Subsequently, in the case of attaching the polarizer, and then performing an autoclave treatment, the bonding strength between the polarizer and the substrate is further enhanced, and the depression is fundamentally eliminated. Secondary bubbles are not easily produced, which ensures the performance of the polarizer.

Fourth embodiment

As shown in FIG. 10, the basic structure of the OLED display panel 50 includes an upper substrate 500a, a lower substrate 500b, a sealant 520, an anode 570, a light-emitting layer 560, and a cathode 550. The inner side of the lower substrate 500b is provided with a sealant 520, and then The inner surface of the upper substrate 500a is bonded by the sealant 500. The sealant 520 and the upper substrate 500a and the lower substrate 500b together form a closed space. In the space, the anode 570 and the light are sequentially stacked on the lower substrate 500b. Layer 560, cathode 550, cathode 550 is selected from the group consisting of metal, and anode 570 is typically ITO. The lower polarizer 510b is attached to the outer surface of the lower substrate 500b as the exit opening, and the function is to enhance the visibility of the display panel under sunlight and improve the contrast. However, the recess 501 originally present in the lower substrate 500a necessarily affects the performance of the lower polarizer 510b. Therefore, to solve the attached air bubbles of the polarizer 510b, a method similar to that of the first embodiment or the third embodiment may be adopted, and the film layer 540 is filled in between the lower substrate 500b and the lower polarizer 510b, such as pressure sensitive. Glue or SAMs, the specific method will not be repeated here. Wherein, when the recess of the substrate of the OLED is filled with the SAMs, if the OLED substrate is a glass substrate, the active molecular solution may be selected from a derivative of an organic hydrazine such as trichloromethane. It is of course also possible to select an organic hydrazine derivative formed from hydrazine of the same family, such as trichlorodecane. If the OLED substrate is a metal substrate, the active molecular solution may be selected from an organic hydrazine derivative such as trichloromethane; an organic hydrazine derivative such as trichlorosilane; a hydroxyl-based active molecule such as p-nitrophenol or m-nitrophenol , o-nitrophenol, p-fluorophenol, m-fluorophenol, o-fluorophenol and ethanol; hydrogenthio-based active molecules such as thiophenol, 2-naphthylthiophenol, isophthalodithiol, ortho-benzene Dithiol, 1,6-hexanedithiol, 1,8-octyldithiol, 1,9-decyldithiol, etc.; other active molecules may be selected from the group consisting of nifedipine. By solving the substrate depression, the bonding strength between the polarizer and the substrate can be strengthened, and the depression is fundamentally obtained. Elimination, secondary bubbles are not easy to produce, ensuring the performance of the polarizer.

The preferred embodiments of the present invention have been disclosed as above, and are not intended to limit the present invention. Any one skilled in the art can make some modifications and retouchings without departing from the spirit and scope of the present invention. The scope is subject to the definition of the scope of the claims.

40‧‧‧ display panel

400a‧‧‧Upper substrate

400b‧‧‧lower substrate

401‧‧‧ dent

410a‧‧‧Upper Polarizer

410b‧‧‧ lower polarizer

420‧‧‧Box glue

430‧‧‧Liquid layer

Claims (16)

A display panel comprising: an upper substrate; a lower substrate disposed opposite to the upper substrate, the outer surface of at least one of the upper substrate and the lower substrate having more than one recess; a frame glue, The upper substrate and the lower substrate are disposed between the upper substrate and the lower substrate; and at least one polarizer is disposed on an outer side surface of at least one of the upper substrate and the lower substrate; At least one filling layer disposed between the polarizer and at least one of the upper substrate and the lower substrate, and after the pressing of the external force to fill the recess, the filling layer The material is selected from a pressure sensitive adhesive, and the pressure sensitive adhesive contains transparent conductive particles. The display panel according to claim 1, wherein the pressure sensitive adhesive has a thickness of 20 to 100 um. The display panel according to claim 1, wherein the concentration of the transparent conductive particles in the pressure sensitive adhesive is 50 to 80%. The display panel according to claim 3, wherein the transparent conductive particles have a diameter of about 5 to 15 um. The display panel according to claim 3, wherein the transparent conductive particles are made of indium tin oxide. The display panel of claim 1, wherein the upper substrate and the lower substrate are selected from one of a glass substrate, a plastic substrate, and a metal substrate. A display panel comprising: an upper substrate; a substrate which is disposed opposite to the upper substrate, and an outer surface of at least one of the upper substrate and the lower substrate has more than one recess; a sealant located on the upper substrate and the lower substrate Between the upper substrate and the lower substrate; at least one polarizer disposed on an outer side surface of at least one of the upper substrate and the lower substrate; at least one filling layer disposed on the Between the polarizer and at least one of the upper substrate or the lower substrate, and after the external force is pressed to fill the recess, wherein the material of the filling layer is selected from a self-assembling molecular film. The self-assembled molecular film is formed in a solution having a concentration of about 10 to 15% of active molecules and has a thickness of about 5 to 100 um. The display panel according to claim 7, wherein the self-assembled molecular film is dried at about 30 to 120 °C. The display panel according to claim 7, wherein the active molecule is one selected from the group consisting of an organodecane derivative and an organodecane derivative. The display panel according to claim 9, wherein the organodecane derivative is selected from the group consisting of trichlorodecane. The display panel according to claim 9, wherein the organodecane derivative is selected from the group consisting of trichlorodecane. The display panel according to claim 7, wherein the active molecule is selected from a hydroxyl group-active molecule. The display panel according to claim 12, wherein the hydroxyl active molecule is selected from the group consisting of p-nitrophenol, m-nitrophenol, o-nitrophenol, p-fluorophenol, m-fluorophenol, o-fluorophenol And one of the ethanol. The display panel of claim 6, wherein: the active molecule is selected from the group consisting of a hydrogenthio group-based active molecule. The display panel according to claim 14, wherein the hydrogenthio group-based active molecule is selected from the group consisting of thiophenol, 2-naphthylthiophenol, isophthalodithiol, phthalyldithiol, and 1,6-hexane. One of dithiol, 1,8-octyl dithiol and 1,9-nonyl dithiol. The display panel of claim 7, wherein: the active molecule is selected from the group consisting of nifedipine.