Correction method for tearing and warping of OLED (Organic Light Emitting Diode) polaroid

Abstract

The invention provides a method for correcting tearing warpage of an OLED (Organic Light Emitting Diode) polaroid, which comprises the following steps of: after the OLED polaroid needing to be corrected is torn off, measuring a warpage value, and recording the warpage as positive warpage or negative warpage; if the OLED polaroid is torn off and warped, the OLED polaroid needing to be corrected is vertically placed in a storage box, the two sides of the OLED polaroid are protected by PS plates, and drying agents are placed on the end face of a product after the PS plates are used for protection; the storage box is placed in a temperature control device, the temperature of the storage box ranges from 40 DEG C to 45 DEG C, and the storage box is placed for 48 h to 96 h in the state; if the object placing box is torn off and negatively warped, the object placing box is placed in a temperature and humidity controller, the temperature of the object placing box is 35-40 DEG C, the humidity of the object placing box is 60% RH-65% RH, and the object placing box is placed for 72-96 H in the state. According to the scheme, the correction time of coiled material placement is greatly shortened, and the defect that warpage after tearing cannot be effectively corrected through traditional bent warpage correction is overcome.

Description

Technical Field

[0001] The invention belongs to the technical field of OLED light emitting technology, and in particular relates to a method for correcting tearing and warping of an OLED polarizer. Background Art

[0002] OLED polarizers, also known as organic light-emitting diodes, are the biggest difference from the mainstream LCD display technology in the market. The information displayed is controlled by self-luminescence of organic materials. OLED polarizers have many characteristics such as full solid state, active luminescence, ultra-high contrast, ultra-thinness, and no viewing angle restrictions. They have become the most promising display technology currently used in multiple product areas, especially OLED mobile phone products are gradually maturing. In the production of OLED polarizers, the upper and lower TACs of the film base are asymmetric structures with different moisture permeabilities. After coating, stress is introduced by adding liquid crystal and multi-layer adhesive structure. After cutting in the later process, the stress is released unevenly to produce tearing and warping. The current existing technologies are: first, the stress is released by placing the coil for a long time (generally the placement time needs to be greater than 30 to 45 days); second, after cutting the small pieces, a certain number of polarizers are protected by PS plates on both sides and the short side of the polarizer is wrapped with tape twice to fix the bend at an angle of 40 to 60 degrees for correction.

[0003] The first method to correct warping is to extend the coil placement time. The coil production and stocking cycle needs to be extended by at least 45 to 60 days, which increases inventory and occupies warehouse storage space, and increases the risk of coil product quality. The second method corrects warping by fixing the bend at a certain angle with tape, which can correct the warping of the single body (with retention and separation), but it has no effect on the warping of tearing. Summary of the invention

[0004] The purpose of the present invention is to provide a method for correcting the tearing and warping of an OLED polarizer, aiming to solve the problem that the existing correction method takes too long.

[0005] The present invention is implemented as follows: a method for correcting the warping of an OLED polarizer due to tearing, the method comprising the following steps:

[0006] Step S1: After the OLED polarizer that needs to be corrected is peeled off, the warpage value is measured, and whether the warpage is positive or negative is recorded;

[0007] Step S2: Place the OLED polarizer to be corrected vertically in a storage box, protect both sides with PS plates, and place a desiccant on the end surface of the product after using PS plates for protection, and then close the storage box with a cover plate;

[0008] Step S3: placing the box containing the warped OLED polarizer to be corrected in a temperature control device, so that the temperature of the box is 40° C. to 45° C., using a timer to observe the total processing time, and taking out the OLED polarizer after placing it in this state for 48 h to 96 h;

[0009] Step S4: Place the box containing the OLED polarizer to be corrected for negative warping in a temperature and humidity controller, so that the box temperature is between 35°C and 40°C and the humidity is between

[0010] 60% RH ~ 65% RH, use a timer to observe the total treatment time, leave it in this state for 72H ~ 96H, then take out the OLED polarizer.

[0011] A further technical solution of the present invention is: in step S1, the protective film is placed face up with four corners facing upwards and the warping is defined as positive warping, and the release film is placed face up with four corners facing upwards and the warping is defined as negative warping.

[0012] A further technical solution of the present invention is: a product frame is provided in the storage box, and the OLED polarizer is placed in the product frame.

[0013] A further technical solution of the present invention is: in step S2, if the OLED polarizer is not large enough to be completely placed in the product frame, a PS plate or a block is used to fill it, so that the PS plate or the block restricts the position of the OLED polarizer, so that each OLED polarizer is tightly fitted.

[0014] A further technical solution of the present invention is: in step S2, the number of desiccant is 4 to 6 packages.

[0015] A further technical solution of the present invention is that a heat-insulating layer is provided on the inner wall of the storage box.

[0016] A further technical solution of the present invention is that the thickness of the OLED polarizer is in the range of 180-220 μm.

[0017] The beneficial effects of the present invention are as follows: the present invention measures the warping of the torn-off small pieces after cutting the small pieces to clarify whether the warping to be corrected is positive warping or negative warping, and then corrects the positive warping by high temperature, and corrects the negative warping by a certain temperature and humidity range, and the time can be controlled within 4 days, which greatly shortens the correction time of the coil placement, and eliminates the disadvantage that the traditional bending warping correction cannot effectively correct the warping after tearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a flow chart of the present invention. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0020] Figure 1 A method for correcting warping of an OLED polarizer provided by the present invention is shown, and the method comprises the following steps:

[0021] Step S1: After the OLED polarizer that needs to be corrected is peeled off, the warpage value is measured, and whether the warpage is positive or negative is recorded;

[0022] Step S2: Place the OLED polarizer to be corrected vertically in a storage box, protect both sides with PS plates, and place a desiccant on the end surface of the product after using PS plates for protection, and then close the storage box with a cover plate;

[0023] Step S3: placing the box containing the warped OLED polarizer to be corrected in a temperature control device, so that the temperature of the box is 40° C. to 45° C., using a timer to observe the total processing time, and taking out the OLED polarizer after placing it in this state for 48 h to 96 h;

[0024] Step S4: Place the box containing the OLED polarizer to be corrected for negative warping in a temperature and humidity controller, so that the box temperature is between 35°C and 40°C and the humidity is between

[0025] 60% RH ~ 65% RH, use a timer to observe the total treatment time, leave it in this state for 72H ~ 96H, then take out the OLED polarizer.

[0026] Preferably, in step S1 , the protective film is placed face up with four corners facing upward and the warping is defined as positive warping, and the release film is placed face up with four corners facing upward and the warping is defined as negative warping.

[0027] Preferably, a product frame is provided in the storage box, and the OLED polarizer is placed in the product frame.

[0028] Preferably, in step S2, if the OLED polarizer is not large enough to be completely placed in the product frame, a PS plate or a block is used to fill it, so that the PS plate or the block restricts the position of the OLED polarizer, so that each OLED polarizer is tightly fitted.

[0029] Preferably, in step S2, the number of desiccant is 4 to 6 packages.

[0030] Preferably, the inner wall of the storage box is provided with a heat-insulating layer.

[0031] Preferably, the thickness of the OLED polarizer is in the range of 180-220 μm.

[0032] The present invention provides a method for correcting warpage of an OLED polarizer after tearing. After cutting small pieces, the warpage of the torn small pieces is measured to determine whether the warpage to be corrected is positive warpage or negative warpage. Then, positive warpage is corrected by high temperature, and negative warpage is corrected by a certain temperature and humidity range. The time can be controlled within 4 days, which greatly shortens the correction time of 45 to 60 days required for the coil to be placed, and eliminates the disadvantage that the traditional bending warpage correction cannot effectively correct the warpage after tearing.

[0033] The purpose of the present invention is to solve the shortcomings and deficiencies in the prior art and propose a correction method for the tearing and warping of OLED polarizers. The thickness of the OLED polarizer is in the range of 180-220 μm, and the preferred thickness is 200 μm.

[0034] Mechanism explanation: The temperature and humidity of the environment where the POL (polarizer) is located is one of the important factors that affect the warpage change of the POL over time, which is particularly important for OLED-type asymmetric structure products. In the humidity-affected POL warpage model, the generally recognized warpage change is that the POL changes to the side with low moisture permeability. In the OLED product structure model, when the POL is in a high humidity environment, the product is in a hygroscopic state, and moisture penetrates from the outside to the inside. For the inner layer of PVA, the moisture content of the protective film + HC-TAC is less than that of the NOR-TAC + liquid crystal + adhesive + release film layer, so the POL will change to the side of the protective film. When the POL is in a low humidity environment, the POL is in a state of releasing moisture, and moisture seeps out from the inside to the outside. For the inner layer of the PVA layer, the moisture permeability of NOR-TAC is less than that of HC-TAC, so the POL will change to the side of the release film.

[0035] Temperature: mainly affects the speed of the POL moisture absorption / dehumidification process. If the temperature is too high, the POL moisture absorption / dehumidification process changes too quickly, which will be accompanied by the overall appearance of the POL deformation, resulting in the failure of the POL warpage correction. If the temperature is too low, the POL moisture absorption / dehumidification process changes slowly, the warpage correction time is too long, and the warpage correction efficiency is affected;

[0036] Humidity: It mainly affects the warping direction of POL, that is, the warping correction direction. Humidity can be achieved by increasing the amount of desiccant and controlling the humidity of the warping correction box;

[0037] Placement time: mainly affects the degree of warpage change of POL. The target required warpage height can be achieved through appropriate warpage correction time.

[0038] The correction effect of the present method is explained below through several specific embodiments, and the experimental results of the relevant embodiments are attached for verification. Among them, sample number 1 and sample number 2 are experimental data on the treatment of OLED polarizers in the case of positive warping when peeling off, and sample number 3 and sample number 4 are experimental data on the treatment of OLED polarizers in the case of negative warping when peeling off. Positive warping in the table: represents the height of the four corners of the product when the protective film is placed face up after the release film is torn off. The table shows the maximum value of the height of the four corners, in mm; negative warping: represents the height of the four corners of the product when the release film is torn off and the release film is placed face up. The table shows the maximum value of the height of the four corners, in mm.

[0039] After the OLED polarizer that needs to be corrected is peeled off, the warpage value is measured and whether the warpage is positive or negative is recorded. The positive warpage is defined as the warpage when the protective film is placed upward with the four corners facing upward, and the negative warpage is defined as the warpage when the release film is placed upward with the four corners facing upward.

[0040] Place the OLED polarizer that needs to be corrected vertically in the storage box and use PS plates on both sides for protection. If the product is not large enough to hold the entire product frame, use more PS plates or blocks for protection, so that the PS plates or blocks can limit the position of the OLED polarizer, so that each OLED polarizer fits tightly to avoid position shift. Place 4 to 6 packs of desiccant on the upper part of the product end surface after using PS plates for protection, and then close the storage box with a cover to isolate it from the external environment.

[0041] Embodiment 1:

[0042] Place the box containing the warped OLED polarizer to be corrected in a temperature control device, manually adjust the temperature to 45°C, use a timer to observe the total processing time, and take out the OLED polarizer after 48 hours in this state to complete the correction work. The specific experimental data is shown in sample number 1.

[0043] Embodiment 2:

[0044] Place the box containing the warped OLED polarizer to be corrected in a temperature control device, manually adjust the temperature to 40°C, use a timer to observe the total processing time, and take out the OLED polarizer after 96 hours in this state to complete the correction work. The specific experimental data is shown in sample number 2.

[0045] Embodiment three:

[0046] Place the box containing the OLED polarizer to be corrected for negative warping in the temperature and humidity controller, and manually adjust the temperature to 40°C and the humidity to 65% RH. Use a timer to observe the total processing time. After 96 hours of placement in this state, take out the OLED polarizer to complete the correction work. The specific experimental data is shown in sample number 3.

[0047] Embodiment 4:

[0048] Place the box containing the OLED polarizer to be corrected for negative warping in the temperature and humidity controller, and manually adjust the temperature to 35°C and the humidity to 60% RH. Use a timer to observe the total processing time. After 80 hours of placement in this state, take out the OLED polarizer to complete the correction work. The specific experimental data is shown in sample number 4.

[0049]

[0050]

[0051]

[0052]

[0053]

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for correcting the warping of an OLED polarizer, characterized in that: The method comprises the following steps: Step S1: After the OLED polarizer that needs to be corrected is peeled off, the warpage value is measured, and whether the warpage is positive or negative is recorded; Step S2: Place the OLED polarizer to be corrected vertically in a storage box, protect both sides with PS plates, and place a desiccant on the end surface of the product after using PS plates for protection, and then close the storage box with a cover plate; Step S3: placing the box containing the warped OLED polarizer to be corrected in a temperature control device, so that the temperature of the box is 40° C. to 45° C., using a timer to observe the total processing time, and taking out the OLED polarizer after placing it in this state for 48 h to 96 h; Step S4: Place the box containing the OLED polarizer to be corrected for negative warping in a temperature and humidity controller, so that the temperature of the box is between 35°C and 40°C, and the humidity is between 60%RH and 65%RH. Use a timer to observe the total processing time. Place the OLED polarizer in this state for 72 hours to 96 hours before taking it out.

2. The method for correcting the warping of OLED polarizer according to claim 1, characterized in that: In step S1 , when the protective film is placed face up and the four corners are warped upward, positive warping is defined as positive warping, and when the release film is placed face up and the four corners are warped upward, negative warping is defined as negative warping.

3. The method for correcting warping of OLED polarizer according to claim 1, characterized in that: A product frame is provided in the storage box, and the OLED polarizer is placed in the product frame.

4. The method for correcting the warping of the OLED polarizer according to claim 3, characterized in that: In step S2, if the OLED polarizer is not large enough to be completely placed in the product frame, a PS plate or a block is used to fill it, so that the PS plate or the block restricts the position of the OLED polarizer, so that each OLED polarizer is tightly fitted.

5. The method for correcting the warping of OLED polarizer according to claim 1, characterized in that: In step S2, the quantity of the desiccant is 4 to 6 packages.

6. The method for correcting warping of OLED polarizer according to claim 1, characterized in that: The inner wall of the storage box is provided with a heat-insulating layer.

7. The method for correcting the warping of OLED polarizer according to claim 1, characterized in that: The thickness of the OLED polarizer is in the range of 180-220 μm.

Images