A method for testing the transmittance variation rate of a liquid crystal panel and a manufacturing method thereof

Abstract

The application discloses a kind of liquid crystal panel's transmission variation rate test method, comprising: corresponding with upper and lower polarizing plates to the upper and lower surfaces of liquid crystal box, form liquid crystal panel;At least one of the upper polarizing plate and lower polarizing plate is rotated to different angles around the light-emitting central axis of the liquid crystal box, and the transmittance of the liquid crystal panel when the upper polarizing plate and lower polarizing plate are at different rotation angles is detected and acquired;According to the transmittance of the liquid crystal panel when the upper polarizing plate and lower polarizing plate are at different rotation angles, the transmittance curve of the liquid crystal panel is fitted;According to the transmittance curve of the liquid crystal panel, the transmittance variation rate of the liquid crystal panel is calculated.The transmittance variation rate calculated by the method can guide the selection of the liquid crystal box and the upper and lower polarizing plates, to improve the brightness consistency of each liquid crystal panel.The application also discloses a kind of liquid crystal panel's manufacturing method, comprising the transmittance variation rate test method.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more particularly to a method for testing and manufacturing a liquid crystal panel with a transmittance variation rate. Background Technology

[0002] The liquid crystal panel includes a liquid crystal cell and an upper polarizer and a lower polarizer, which are respectively attached to the upper and lower surfaces of the liquid crystal cell. Since the liquid crystal panel controls light transmission based on the optical rotation of the liquid crystal material and the polarization of the polarizers, the relative angle between the liquid crystal cell and the upper and lower polarizers affects the transmittance of the liquid crystal panel.

[0003] During the production of the liquid crystal panel, the deviation in the bonding angle between the liquid crystal cell and the upper and lower polarizers is always unavoidable. That is, after the upper and lower polarizers are bonded, there is always a certain angular rotational deviation relative to the liquid crystal cell. This leads to the problem of inconsistent brightness between different liquid crystal panels, with some liquid crystal panels being brighter and others being darker.

[0004] To address the aforementioned bonding rotation deviation issue, machine vision systems are currently the primary means of improving the bonding accuracy between the liquid crystal cell and the upper and lower polarizers. However, machine vision systems suffer from high costs and complex algorithms. Summary of the Invention

[0005] To address the shortcomings of the prior art, this invention provides a method for testing the transmittance variation of a liquid crystal panel. This method can calculate the transmittance variation when the liquid crystal cell rotates relative to the upper and lower polarizers, thereby guiding the selection and matching of the liquid crystal cell with the upper and lower polarizers. This ensures that the brightness difference of each liquid crystal panel is minimized when there is a bonding rotation deviation, thus improving the brightness consistency of each liquid crystal panel.

[0006] The present invention also provides a method for manufacturing a liquid crystal panel, including the above-mentioned method for testing the transmittance change rate.

[0007] The technical problem to be solved by the present invention is achieved through the following technical solution: A method for testing the transmittance change rate of a liquid crystal panel includes the following steps: Step 100: Attach the upper polarizer and the lower polarizer to the upper and lower surfaces of the liquid crystal cell to form a liquid crystal panel; Step 200: Rotate at least one of the upper polarizer and the lower polarizer around the light-emitting central axis of the liquid crystal cell to different angles, and detect the transmittance of the liquid crystal panel when the upper polarizer and the lower polarizer are at different rotation angles. Step 300: Based on the transmittance of the liquid crystal panel when the upper polarizer and the lower polarizer are at different rotation angles, the transmittance curve of the liquid crystal panel is obtained by fitting. Step 400: Calculate the transmittance variation rate of the liquid crystal panel based on the transmittance curve of the liquid crystal panel.

[0008] Furthermore, the rotation of the upper polarizer and the lower polarizer includes forward rotation and reverse rotation. When rotating forward, at least one of the upper polarizer and the lower polarizer is rotated in the forward direction in step 200. When rotating reverse, at least one of the upper polarizer and the lower polarizer is rotated in the reverse direction in step 200.

[0009] Furthermore, the rotation of the upper polarizer and the lower polarizer includes single rotation and double rotation. In single rotation, only the upper polarizer or the lower polarizer is rotated in step 200. In double rotation, both the upper polarizer and the lower polarizer are rotated simultaneously in step 200.

[0010] Furthermore, the upper polarizer and the lower polarizer include a variable adhesive, and are respectively attached to the upper and lower surfaces of the liquid crystal cell by the variable adhesive.

[0011] Furthermore, the viscous variable adhesive is a heat-sensitive adhesive or a photosensitive adhesive.

[0012] Furthermore, in step 200, the step of rotating at least one of the upper polarizer and the lower polarizer around the light-emitting central axis of the liquid crystal cell to different angles is as follows: Step 210: Reduce the viscosity of the variable adhesive in at least one of the upper and lower polarizers; Step 220: Peel at least one of the upper polarizer and lower polarizer, after the viscosity has been reduced, off the liquid crystal cell; Step 230: Rotate at least one of the peeled upper polarizer and lower polarizer around the light-emitting central axis of the liquid crystal cell by a unit angle. Step 240: Reattach at least one of the upper polarizer and lower polarizer, after rotating by a unit angle, to the liquid crystal cell; Step 250: Increase the tackiness of at least one of the re-laminated upper and lower polarizers using a variable adhesive.

[0013] Furthermore, in step 200, the step of detecting and obtaining the transmittance of the liquid crystal panel when the upper polarizer and the lower polarizer are at different rotation angles is as follows: Step 260: Place the liquid crystal panel on the light-emitting surface of the standard backlight; Step 270: Drive the LCD panel and standard backlight to light up, and detect and obtain the test brightness of the standard backlight after passing through the LCD panel; Step 280: Calculate the transmittance of the liquid crystal panel based on the original brightness and test brightness of the standard backlight.

[0014] Furthermore, in step 200, the transmittance of the liquid crystal panel when the upper polarizer and the lower polarizer are at different rotation angles is t=Lz / Lb*100%, where Lz is the test brightness of the standard backlight after passing through the liquid crystal panel, and Lb is the original brightness of the standard backlight.

[0015] Furthermore, the transmittance curves include a forward single-rotation transmittance curve, a reverse single-rotation transmittance curve, a forward double-rotation transmittance curve, and a reverse double-rotation transmittance curve. If the forward single-rotation transmittance curve of the liquid crystal panel is detected, then in step 200, only the upper polarizer or the lower polarizer is rotated in the forward direction. If the reverse single-rotation transmittance curve of the liquid crystal panel is detected, then in step 200, only the upper polarizer or the lower polarizer is rotated in the reverse direction. If the forward double-rotation transmittance curve of the liquid crystal panel is detected, then in step 200, both the upper polarizer and the lower polarizer are rotated in the forward direction simultaneously. If the reverse double-rotation transmittance curve of the liquid crystal panel is detected, then in step 200, both the upper polarizer and the lower polarizer are rotated in the reverse direction simultaneously.

[0016] A method for manufacturing a liquid crystal panel includes the following steps: Step S1: Select and match different types of upper polarizers, lower polarizers and liquid crystal cells to form multiple matching schemes for the liquid crystal panel; Step S2: Using the transmittance change rate test method described above, the transmittance change rate of LCD panels with different matching schemes is tested; Step S3: Produce the liquid crystal panel using the combination scheme with the lowest transmittance change rate.

[0017] The present invention has the following beneficial effects: The testing method of the present invention involves rotating at least one of the upper polarizer and the lower polarizer sequentially around the light-emitting axis of the liquid crystal cell to different angles, thereby detecting the transmittance of the liquid crystal panel at different rotation angles of the upper polarizer and the lower polarizer, and finally calculating the transmittance variation rate of the liquid crystal panel. The transmittance variation rate reflects the change in transmittance when at least one of the upper polarizer and the lower polarizer rotates relative to the liquid crystal cell by a unit angle, and is related to the model of the upper polarizer, the lower polarizer and the liquid crystal cell. The transmittance variation rate can guide the selection and matching between the liquid crystal cell and the upper polarizer and the lower polarizer, so that when the upper polarizer and the lower polarizer have a bonding rotation deviation, the brightness difference of each liquid crystal panel is minimized, thereby improving the brightness consistency of each liquid crystal panel. Attached Figure Description

[0018] Figure 1This is a flowchart illustrating the steps of the transmission rate of change test method provided by the present invention.

[0019] Figure 2 This is a flowchart of step 200 in the transmission rate change test method provided by the present invention.

[0020] Figure 3 A flowchart illustrating the manufacturing method provided by this invention. Detailed Implementation

[0021] The present invention will now be described in detail with reference to the accompanying drawings and embodiments, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0022] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0023] Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature. In the description of this invention, "multiple" means two or more, unless otherwise explicitly specified.

[0024] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," and "setting," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. Example 1

[0025] like Figure 1 As shown, a method for testing the transmittance change rate of a liquid crystal panel includes the following steps: Step 100: Attach the upper polarizer and the lower polarizer to the upper and lower surfaces of the liquid crystal cell to form a liquid crystal panel.

[0026] In step 100, the liquid crystal cell includes a color filter substrate and an array substrate disposed opposite to each other, and liquid crystal material is sealed between the color filter substrate and the array substrate by an external sealant; the upper polarizer is attached to the side surface of the color filter substrate facing away from the array substrate, and the lower polarizer is attached to the side surface of the array substrate facing away from the color filter substrate.

[0027] The upper and lower polarizers have perpendicular polarization directions. When the liquid crystal cell is powered on, the liquid crystal material, under the action of the deflection electric field, can rotate the polarization direction of the polarized light by 90°, so that the polarized light passing through the lower polarizer can pass through the upper polarizer, and the liquid crystal panel is in a lit state. When the liquid crystal cell is powered off, the liquid crystal material loses the effect of the deflection electric field and cannot rotate the polarization direction of the polarized light, so that the polarized light passing through the lower polarizer cannot pass through the upper polarizer, and the liquid crystal panel is in a turned-off state.

[0028] The array substrate has a pixel array arranged in a longitudinal and transverse direction on its substrate plane. The angle between the polarization direction of the upper polarizer and the pixel arrangement direction of the liquid crystal cell, the angle between the polarization direction of the lower polarizer and the pixel arrangement direction of the liquid crystal cell, and the angle between the polarization directions of the upper polarizer and the lower polarizer all affect the transmittance of the liquid crystal panel. Generally, the polarization direction of one of the upper and lower polarizers is parallel to the transverse direction of the pixel arrangement, and the polarization direction of the other is parallel to the longitudinal direction of the pixel arrangement. When the upper and lower polarizers are bonded together, the bonding rotation deviation of the upper and lower polarizers will cause the transmittance of each liquid crystal panel to be inconsistent.

[0029] When the upper polarizer, lower polarizer, and liquid crystal cell of the liquid crystal panel are matched with different models, the transmittance of the liquid crystal panel will not change in the same way even if the bonding and rotation deviation of the upper polarizer and lower polarizer are the same.

[0030] Step 200: Rotate at least one of the upper polarizer and the lower polarizer around the light-emitting central axis of the liquid crystal cell to different angles, and detect the transmittance of the liquid crystal panel when the upper polarizer and the lower polarizer are at different rotation angles.

[0031] In step 200, the rotation of the upper and lower polarizers includes clockwise and counterclockwise rotation. In this embodiment, the clockwise rotation direction of the upper and lower polarizers is defined as clockwise, and the counterclockwise rotation direction is defined as counterclockwise. The rotation of the upper and lower polarizers includes single rotation and double rotation. Single rotation refers to rotating only the upper or lower polarizer, while double rotation refers to rotating both the upper and lower polarizers simultaneously.

[0032] To facilitate repeated bonding and peeling of the upper and lower polarizers on the liquid crystal cell and to avoid residual adhesive on the liquid crystal cell, preferably, the upper and lower polarizers include a variable adhesive and are bonded to the upper and lower surfaces of the liquid crystal cell respectively by the variable adhesive.

[0033] The term "variable viscosity adhesive" refers to an adhesive whose viscosity changes significantly with variations in a specific parameter of the external environment, such as thermosensitive adhesives and photosensitive adhesives. The viscosity of thermosensitive adhesives changes significantly with ambient temperature; as the ambient temperature rises, the viscosity increases, and as the ambient temperature decreases, the viscosity decreases. Similarly, the viscosity of photosensitive adhesives changes significantly with variations in the thermally constant wavelength of light in the environment; as the thermally constant wavelength of light in the environment rises, the viscosity increases, and as the specific wavelength of light in the environment decreases, the viscosity decreases.

[0034] In this embodiment, the variable adhesive may be, but is not limited to, a heat-sensitive adhesive or a photosensitive adhesive.

[0035] like Figure 2 As shown, in step 200, the step of rotating at least one of the upper polarizer and the lower polarizer to different angles around the light-emitting central axis of the liquid crystal cell is as follows: Step 210: Reduce the viscosity of the viscous variable adhesive in at least one of the upper and lower polarizers.

[0036] In step 210, if the variable adhesive is a thermosensitive adhesive, the viscosity of the variable adhesive can be reduced by lowering the ambient temperature; if the variable adhesive is a photosensitive adhesive, the viscosity of the variable adhesive can be reduced by lowering the content of light of a specific wavelength in the environment.

[0037] If a single rotation is required, the viscosity of the adhesive on the upper or lower polarizer is reduced only. If a double rotation is required, the viscosity of the adhesive on both the upper and lower polarizers is reduced simultaneously.

[0038] Step 220: Peel at least one of the upper polarizer and lower polarizer, after the viscosity has been reduced, off the liquid crystal cell.

[0039] In step 220, if a single rotation is required, only the upper polarizer or the lower polarizer is peeled off from the liquid crystal cell; if a double rotation is required, both the upper polarizer and the lower polarizer are peeled off from the liquid crystal cell simultaneously.

[0040] Step 230: Rotate at least one of the peeled upper polarizer and lower polarizer around the light-emitting central axis of the liquid crystal cell by a unit angle.

[0041] In step 230, if forward rotation is required, at least one of the upper polarizer and the lower polarizer is rotated forward by a unit angle around the light emission axis of the liquid crystal cell; if reverse rotation is required, at least one of the upper polarizer and the lower polarizer is rotated backward by a unit angle around the light emission axis of the liquid crystal cell; if single rotation is required, only the upper polarizer or the lower polarizer is rotated around the light emission axis of the liquid crystal cell by a unit angle; if double rotation is required, both the upper polarizer and the lower polarizer are rotated around the light emission axis of the liquid crystal cell by a unit angle simultaneously.

[0042] Preferably, the unit angle is 1°. Of course, the unit angle can also be other sizes, but it should be as small as possible. The smaller the unit angle, the greater the accuracy of the transmittance change rate test.

[0043] Step 240: Reattach at least one of the upper polarizer and lower polarizer, after rotating by a unit angle, to the liquid crystal cell.

[0044] In step 240, if a single rotation is required (simply peeling off the upper or lower polarizer), then the upper or lower polarizer is reattached to the liquid crystal cell. If a double rotation is required (simply peeling off both the upper and lower polarizers), then both the upper and lower polarizers are reattached to the liquid crystal cell.

[0045] Step 250: Increase the tackiness of at least one of the re-laminated upper and lower polarizers using a variable adhesive.

[0046] In step 250, if the variable adhesive is a thermosensitive adhesive, the adhesiveness can be increased by raising the ambient temperature; if the variable adhesive is a photosensitive adhesive, the adhesiveness can be increased by increasing the content of light of a specific wavelength in the environment.

[0047] If a single spin is required (only re-attaching the upper or lower polarizer), then only the adhesive strength of the variable adhesive on the upper or lower polarizer is increased. If a double spin is required (simultaneously re-attaching the upper or lower polarizer), then the adhesive strength of both the upper and lower polarizers is increased.

[0048] In addition, such as Figure 2 As shown, in step 200, the step of detecting and obtaining the transmittance of the liquid crystal panel when the upper polarizer and the lower polarizer are at different rotation angles is as follows: Step 260: Place the liquid crystal panel on the light-emitting surface of the standard backlight.

[0049] In step 260, the standard backlight is used to provide the backlight required for testing the liquid crystal panel. Its original brightness when not equipped with the liquid crystal panel can be known or obtained by measuring the brightness with a brightness meter before testing.

[0050] Step 270: Drive the LCD panel and standard backlight to light up, and detect and obtain the test brightness of the standard backlight after passing through the LCD panel.

[0051] In step 270, the standard backlight is driven to be lit, so that the standard backlight provides backlight to the liquid crystal panel at its original brightness. The liquid crystal panel is also driven to be lit, so that all pixels in the liquid crystal panel are turned on to allow the backlight of the standard backlight to pass through. Then, the brightness of the standard backlight after passing through the liquid crystal panel is detected by the brightness detector on the other side of the liquid crystal panel away from the standard backlight.

[0052] Step 280: Calculate the transmittance of the liquid crystal panel based on the original brightness and test brightness of the standard backlight.

[0053] In step 280, the transmittance of the liquid crystal panel when the upper polarizer and the lower polarizer are at different rotation angles is t=Lz / Lb*100%, where Lz is the test brightness of the standard backlight after passing through the liquid crystal panel, and Lb is the original brightness of the standard backlight.

[0054] Repeat steps 210-280 continuously. First, rotate at least one of the upper polarizer and the lower polarizer by a unit angle, and then calculate the transmittance t1 of the liquid crystal panel at this time. Then rotate at least one of the upper polarizer and the lower polarizer by a unit angle, and then calculate the transmittance t2 of the liquid crystal panel at this time, and so on, until at least one of the upper polarizer and the lower polarizer has completed a 180° rotation. Calculate the transmittance t1-tn of multiple liquid crystal panels.

[0055] Step 300: Based on the transmittance of the liquid crystal panel when the upper polarizer and the lower polarizer are at different rotation angles, the transmittance curve of the liquid crystal panel is obtained by fitting.

[0056] In step 300, a rectangular coordinate system is proposed, with the rotation angle as the horizontal axis and the transmittance as the vertical axis. Then, methods such as linear fitting, least squares, quadratic polynomial fitting, cubic polynomial fitting, semi-logarithmic regression fitting, Log-Log regression fitting, Logit-log, four-parameter fitting, and cubic spline interpolation are used to perform curve fitting on the data. Curve fitting is a conventional technique and will not be described in detail here.

[0057] Based on the rotation method of the upper and lower polarizers, in this embodiment, the transmittance curve includes a forward single-rotation transmittance curve, a reverse single-rotation transmittance curve, a forward double-rotation transmittance curve, and a reverse double-rotation transmittance curve. If the forward single-rotation transmittance curve of the liquid crystal panel is detected, then in step 200, only the upper polarizer or the lower polarizer is rotated in the forward direction. If the reverse single-rotation transmittance curve of the liquid crystal panel is detected, then in step 200, only the upper polarizer or the lower polarizer is rotated in the reverse direction. If the forward double-rotation transmittance curve of the liquid crystal panel is detected, then in step 200, both the upper polarizer and the lower polarizer are rotated in the forward direction simultaneously. If the reverse double-rotation transmittance curve of the liquid crystal panel is detected, then in step 200, both the upper polarizer and the lower polarizer are rotated in the reverse direction simultaneously.

[0058] Step 400: Calculate the transmittance variation rate of the liquid crystal panel based on the transmittance curve of the liquid crystal panel.

[0059] In step 400, the transmittance of the liquid crystal panel is negatively correlated with the rotation angle of the upper polarizer and the lower polarizer. The slope or average slope of the transmittance curve is calculated as the transmittance variation rate of the liquid crystal panel.

[0060] In this embodiment, the transmittance curves include a forward single-spin transmittance curve, a reverse single-spin transmittance curve, a forward double-spin transmittance curve, and a reverse double-spin transmittance curve. The slopes or average slopes of the above four transmittance curves can be weighted and averaged to obtain a weighted average value as the final transmittance change rate of the liquid crystal panel.

[0061] The testing method of this invention involves sequentially rotating at least one of the upper and lower polarizers around the light-emitting axis of the liquid crystal cell to different angles, thereby detecting the transmittance of the liquid crystal panel at different rotation angles of the upper and lower polarizers, and finally calculating the transmittance variation rate of the liquid crystal panel. The transmittance variation rate reflects the change in transmittance when at least one of the upper and lower polarizers rotates relative to the liquid crystal cell by a unit angle, and is related to the model of the upper polarizer, lower polarizer, and liquid crystal cell. The transmittance variation rate can guide the selection and matching between the liquid crystal cell and the upper and lower polarizers, so that when there is a bonding rotation deviation between the upper and lower polarizers, the brightness difference of each liquid crystal panel is minimized, thereby improving the brightness consistency of each liquid crystal panel. Example 2

[0062] like Figure 3 As shown, a method for manufacturing a liquid crystal panel includes the following steps: Step S1: Select and match different types of upper polarizers, lower polarizers and liquid crystal cells to form multiple matching schemes for the liquid crystal panel; Step S2: Using the transmittance change rate test method described in Example 1, the transmittance change rate of liquid crystal panels with different matching schemes is tested; Step S3: Produce the liquid crystal panel using the combination scheme with the lowest transmittance change rate.

[0063] The manufacturing method of the present invention involves selecting and matching different types of upper polarizers, lower polarizers, and liquid crystal cells, then testing the transmittance variation rate of liquid crystal panels using different matching schemes, and using the matching scheme with the lowest transmittance variation rate to produce the liquid crystal panel. This ensures that when the upper polarizer and lower polarizer have a bonding and rotational deviation, the brightness difference of each liquid crystal panel is minimized, thereby improving the brightness consistency of each liquid crystal panel.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present invention and not to limit them. Although the embodiments of the present invention have been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the embodiments of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for manufacturing a liquid crystal panel, characterized in that, Includes the following steps: Step S1: Select and match different types of upper polarizers, lower polarizers and liquid crystal cells to form multiple matching schemes for the liquid crystal panel; Step S2: The transmittance change rate test method is used to test the transmittance change rate of LCD panels with different matching schemes; Step S3: Produce the liquid crystal panel using the combination scheme with the lowest transmittance change rate; The method for testing the rate of change of transmittance includes the following steps: Step 100: Attach the upper polarizer and the lower polarizer to the upper and lower surfaces of the liquid crystal cell to form a liquid crystal panel; Step 200: Rotate at least one of the upper polarizer and the lower polarizer around the light-emitting central axis of the liquid crystal cell to different angles, and detect the transmittance of the liquid crystal panel when the upper polarizer and the lower polarizer are at different rotation angles. Step 300: Based on the transmittance of the liquid crystal panel when the upper polarizer and the lower polarizer are at different rotation angles, the transmittance curve of the liquid crystal panel is obtained by fitting. Step 400: Calculate the transmittance variation rate of the liquid crystal panel based on the transmittance curve of the liquid crystal panel.

2. The manufacturing method according to claim 1, characterized in that, The rotation of the upper polarizer and the lower polarizer includes forward rotation and reverse rotation. In forward rotation, at least one of the upper polarizer and the lower polarizer is rotated in the forward direction in step 200. In reverse rotation, at least one of the upper polarizer and the lower polarizer is rotated in the reverse direction in step 200.

3. The manufacturing method according to claim 1 or 2, characterized in that, The rotation of the upper polarizer and the lower polarizer includes single rotation and double rotation. In single rotation, only the upper polarizer or the lower polarizer is rotated in step 200. In double rotation, both the upper polarizer and the lower polarizer are rotated in step 200.

4. The manufacturing method according to claim 1, characterized in that, The upper polarizer and the lower polarizer include a variable adhesive and are respectively attached to the upper and lower surfaces of the liquid crystal cell by the variable adhesive.

5. The manufacturing method according to claim 4, characterized in that, The adhesive is a thermosensitive adhesive or a photosensitive adhesive.

6. The manufacturing method according to claim 4, characterized in that, In step 200, the step of rotating at least one of the upper polarizer and the lower polarizer to different angles around the light-emitting central axis of the liquid crystal cell is as follows: Step 210: Reduce the viscosity of the variable adhesive in at least one of the upper and lower polarizers; Step 220: Peel at least one of the upper polarizer and lower polarizer, after the viscosity has been reduced, off the liquid crystal cell; Step 230: Rotate at least one of the peeled upper polarizer and lower polarizer around the light-emitting central axis of the liquid crystal cell by a unit angle. Step 240: Reattach at least one of the upper polarizer and lower polarizer, after rotating by a unit angle, to the liquid crystal cell; Step 250: Increase the tackiness of at least one of the re-laminated upper and lower polarizers using a variable adhesive.

7. The manufacturing method according to claim 6, characterized in that, In step 200, the step of detecting and obtaining the transmittance of the liquid crystal panel when the upper polarizer and the lower polarizer are at different rotation angles is as follows: Step 260: Place the liquid crystal panel on the light-emitting surface of the standard backlight; Step 270: Drive the LCD panel and standard backlight to light up, and detect and obtain the test brightness of the standard backlight after passing through the LCD panel; Step 280: Calculate the transmittance of the liquid crystal panel based on the original brightness and test brightness of the standard backlight.

8. The manufacturing method according to claim 7, characterized in that, In step 200, the transmittance of the liquid crystal panel when the upper polarizer and the lower polarizer are at different rotation angles is t=Lz / Lb*100%, where Lz is the test brightness of the standard backlight after passing through the liquid crystal panel, and Lb is the original brightness of the standard backlight.

9. The manufacturing method according to claim 1, characterized in that, The transmittance curves include forward single-rotation transmittance curves, reverse single-rotation transmittance curves, forward double-rotation transmittance curves, and reverse double-rotation transmittance curves. If the forward single-rotation transmittance curve of the liquid crystal panel is detected, then in step 200, only the upper polarizer or the lower polarizer is rotated in the forward direction. If the reverse single-rotation transmittance curve of the liquid crystal panel is detected, then in step 200, only the upper polarizer or the lower polarizer is rotated in the reverse direction. If the forward double-rotation transmittance curve of the liquid crystal panel is detected, then in step 200, both the upper polarizer and the lower polarizer are rotated in the forward direction simultaneously. If the reverse double-rotation transmittance curve of the liquid crystal panel is detected, then in step 200, both the upper polarizer and the lower polarizer are rotated in the reverse direction simultaneously.

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