Display module, preparation method thereof and display device

Abstract

The application discloses a display module, a preparation method thereof and a display device, and aims at avoiding light leakage. The display module provided by the application comprises a liquid crystal display panel. The thickness of the liquid crystal display panel is uniform, the light-in surface and the light-out surface of the liquid crystal display panel are parallel at each position, the light-in surface and the light-out surface of the liquid crystal display panel are both first curved surfaces, and the first curved surface comprises a pair of oppositely arranged first curved edges, and the first curved edge comprises a curved portion with continuously changed curvature.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a display module, a preparation method thereof and a display device. BACKGROUND

[0002] Liquid Crystal Display (LCD) has become the mainstream of the market due to its high space utilization efficiency, low power consumption, no radiation, low electromagnetic interference and other superior characteristics. With the continuous development of display technology, in recent years, major manufacturers have successively launched curved liquid crystal displays. Overall, the curved liquid crystal display can provide the best viewing effect from the edge to the middle. However, the curved liquid crystal display product has a light leakage problem that needs to be solved urgently. SUMMARY

[0003] The embodiments of the present application provide a display module, a preparation method thereof and a display device to avoid light leakage.

[0004] The display module provided by the embodiments of the present application includes a liquid crystal display panel; the liquid crystal display panel has uniform thickness, and the light entrance surface and the light exit surface thereof are parallel at each position; the light entrance surface and the light exit surface of the liquid crystal display panel are both first curved surfaces; the first curved surface includes a pair of first curved edges arranged oppositely, and the first curved edge includes a curved portion with continuously changing curvature.

[0005] In some embodiments, the curved portion includes a first portion and a second portion, and the first portion and the second portion are both ease curves with continuously changing curvature.

[0006] In the first portion, the curvature radii at different positions are different.

[0007] In the second portion, the curvature radii at different positions are different.

[0008] In some embodiments, in a direction from a connection position of the first portion and the second portion to an end point on a side of the first portion away from the connection position, the curvature radius of the first portion continuously increases; in a direction from the connection position to an end point on a side of the second portion away from the connection position, the curvature radius of the second portion continuously increases.

[0009] In some embodiments, the first portion is symmetrical to the second portion.

[0010] In some embodiments, the curved portion is a polynomial curve.

[0011] In some embodiments, the curved display module further includes a curved backlight module.

[0012] The liquid crystal display panel is located on the light exit side of the curved backlight module.

[0013] The curved backlight module has a second curved surface, and the curvature of the second curved surface is the same as that of the first curved surface.

[0014] An embodiment of the present application provides a method for preparing a curved display module, comprising:

[0015] Manufacturing a liquid crystal display panel; the liquid crystal display panel has a uniform thickness, and its light incident surface and light emitting surface are parallel at all locations;

[0016] The liquid crystal display panel is bent so that the light incident surface and the light emitting surface are both first curved surfaces; wherein the first curved surface includes a pair of first curved edges arranged opposite to each other; and the first curved portion includes a curved portion with a continuously changing curvature.

[0017] In some embodiments, it further includes:

[0018] Producing a curved backlight module; wherein the curved backlight module has a second curved surface, and the curvature of the second curved surface is the same as that of the first curved surface;

[0019] The liquid crystal display panel is bent so that both the light incident surface and the light emitting surface are first curved surfaces, specifically comprising:

[0020] A liquid crystal display panel is fixed on one side of the curved backlight module having the second curved surface, so that the light incident surface and the light emitting surface of the liquid crystal display panel are bent into the first curved surface.

[0021] In some embodiments, before manufacturing the curved backlight module, the process further includes:

[0022] Providing a flexible display module for testing, and controlling the flexible display module for testing to be in a naturally curved state so that the curved edge of the flexible display module for testing includes a gentle curve;

[0023] Measuring the bending curve of the curved edge of the test flexible display module in a naturally bent state;

[0024] The curved curve is fitted to obtain a polynomial curve; the first curved portion and the curved portion included in the second curved surface are both at least partial areas of the polynomial curve.

[0025] An embodiment of the present application provides a display device, which includes a display module provided by an embodiment of the present application.

[0026] The display module, preparation method thereof, and display device provided in the embodiments of the present application, the liquid crystal display panel is a curved liquid crystal display panel, the light incident surface and the light output surface of the curved liquid crystal display panel are both first curved surfaces, the first curved surface includes a first curved edge, the curvature of the curved portion included in the first curved edge continuously changes, that is, the curved portion is a gentle curve, and the curvature radius of the curved portion is different at different positions, so that there is no stress concentration point on the curved portion, and accordingly, the shape of any cross-section facing the first curved surface parallel to the first curved edge is the same as the first curved edge, that is, the cross-section also includes a curved portion with a continuously changing curvature, and there is no stress concentration area on the first curved surface, which can avoid light leakage of the curved liquid crystal display panel caused by stress concentration and improve the display effect of the display module. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0028] Figure 1 A structural diagram of a curved display panel provided for related technology;

[0029] Figure 2 A schematic structural diagram of another curved display panel provided for related technology;

[0030] Figure 3 A schematic structural diagram of a liquid crystal display panel in a display module provided in an embodiment of the present application;

[0031] Figure 4 A schematic flow chart of a method for preparing a display module provided in an embodiment of the present application;

[0032] Figure 5 A schematic diagram of a flexible display module for testing provided in an embodiment of the present application from an initial state to a naturally bent state;

[0033] Figure 6 A schematic diagram of a fitted polynomial curve provided in an embodiment of the present application. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below in conjunction with the drawings of the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. And in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. Based on the described embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] Unless otherwise defined, the technical or scientific terms used in this application should have the usual meaning understood by people with ordinary skills in the field to which this application belongs. The words "first", "second" and similar terms used in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0036] It should be noted that the sizes and shapes of the figures in the accompanying drawings do not reflect the actual scale and are only for the purpose of illustrating the contents of this application. The same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions.

[0037] In related technologies, curved displays are classified into cylindrical and non-cylindrical surfaces. Figure 1 As shown in , the cylindrical surface has a fixed curvature radius R, and its stress is concentrated on the straight side of the display surface. Figure 2 As shown, the non-cylindrical surface consists of a curved region with a constant radius of curvature R and a flat region. Stress is concentrated at the intersection of the curved and flat regions. Whether cylindrical or non-cylindrical, when the display panel is a liquid crystal display (LCD), severe light leakage will occur at the stress concentration location.

[0038] The embodiment of the present application provides a display module, such as Figure 3 As shown, the display module includes a liquid crystal display panel 1; the liquid crystal display panel has a uniform thickness, and its light incident surface and light emitting surface are parallel at all locations. The light incident surface and light emitting surface of the liquid crystal display panel 1 are both first curved surfaces 101, and the first curved surface 101 includes a pair of first curved edges 102 arranged opposite to each other; the first curved edge 102 includes a curved portion 1021 with a continuously changing curvature.

[0039] It should be noted that the first curved surface is a curved surface that can be unfolded into a plane. The first curved surface can be considered as a curved surface formed by the first curved edge as the generatrix moving along the direction in which the two first curved edges are arranged. That is, in the area outside the first curved edge, the shape of the cross section facing the first curved surface parallel to the first curved edge is the same as that of the first curved edge, and this cross section also includes a curved portion with a continuously changing curvature.

[0040] It should be noted that a curve with continuously changing curvature is a transition curve.

[0041] The display module provided in the embodiment of the present application has a liquid crystal display panel which is a curved liquid crystal display panel. The light incident surface and the light emitting surface of the curved liquid crystal display panel are both first curved surfaces. The first curved surface includes a first curved edge. The curvature of the curved portion included in the first curved edge changes continuously, that is, the curved portion is a gentle curve, and the curvature radius of the curved portion is different at different positions, so that there is no stress concentration point on the curved portion. Accordingly, the shape of any cross-section facing the first curved surface that is parallel to the first curved edge is the same as the first curved edge, that is, the cross-section also includes a curved portion with a continuously changing curvature. There is no stress concentration position on the first curved surface, which can avoid light leakage of the curved liquid crystal display panel caused by stress concentration, thereby improving the display effect of the display module.

[0042] In some embodiments, as Figure 3 As shown, the curved portion 1021 includes a first portion 10211 and a second portion 10212 , and the first portion 10211 and the second portion 10212 are both gentle curves with continuously changing curvatures;

[0043] In the first portion 10211 , the radius of curvature at any different position is different;

[0044] In the second portion 10212 , the curvature radius at any different position is different.

[0045] by Figure 3 Taking the second portion 10212 as an example, the curvature radius at b is R3, the curvature radius at c is R2, and the curvature radius at d is R1, and R1, R2, and R3 are not equal. R1<R2<R3.

[0046] In some embodiments, as Figure 3As shown, d is the junction of the first portion 10211 and the second portion 10212, a is the endpoint of the first portion 10211 away from the junction d, and b is the endpoint of the second portion 10212 away from the junction d. The radius of curvature of the first portion increases continuously from the junction d to the endpoint a of the first portion 10211 away from the junction d, and the radius of curvature of the second portion increases continuously from the junction d to the endpoint b of the second portion 10212 away from the junction d. That is, the curvature radii from the junction d of the first portion 10211 and the second portion 10212 on both sides have the same changing trend. This results in a concave light-emitting surface for the LCD panel and a concave display surface for the display module, facilitating user viewing.

[0047] In some embodiments, as Figure 3 As shown, the first portion 10211 is symmetrical to the second portion 10212. This ensures the aesthetics of the display module and the viewing effect of the user, thereby improving the user experience.

[0048] In specific implementation, since the first part is symmetrical with the second part, that is, Figure 3 As shown, d is the midpoint of curved portion 1021, the length of the first portion is equal to the length of the second portion, and the distance from point a to point d is equal to the distance from point b to point d. The line connecting points a and b is parallel to the tangent plane 2 at the midpoint of curved portion 1021, and the distance from point a to tangent plane 2 is equal to the distance from point b to tangent plane 2, which is H.

[0049] In related art, if the first curved surface is a cylindrical surface, and the line connecting points a and b is parallel to the tangent plane at point d, and the distance H remains constant, the corresponding radius of curvature of points a, b, c, and d on the cylindrical surface is the same, all R. This results in stress concentration at points a and b, which can easily cause light leakage. However, in the present application, where the curved portion is a gentle curve, R1<R<R3, there is no stress concentration area, and light leakage will not occur at points a and b.

[0050] In some embodiments, the curved portion is a polynomial curve.

[0051] In a specific implementation, the polynomial curve may be a parabola, a cubic parabola, a seventh-order quadrinomial or other polynomial curves.

[0052] Of course, in specific implementation, the curved portion may also be other gentle curves such as a clothoid.

[0053] In some embodiments, as Figure 3As shown, first curved edge 102 includes only curved portion 1021, i.e., first curved edge 102 is a gentle curve. As a result, the curvature of any position on the first curved edge varies continuously, eliminating any stress concentration areas. Accordingly, the curvature of any position on any cross-section parallel to the first curved edge and facing the first curved surface varies continuously, eliminating any stress concentration areas on the first curved surface, further preventing light leakage from the LCD panel.

[0054] In some embodiments, the curved display module further includes: a curved backlight module;

[0055] The liquid crystal display panel is located on the light-emitting side of the curved backlight module;

[0056] The curved backlight module has a second curved surface, and the curvature of the second curved surface is the same as that of the first curved surface.

[0057] In a specific implementation, the second curved surface has the same curvature as the first curved surface, i.e., the curved edge of the second curved surface also includes a transition curve. The curvature of the curved backlight module can be designed so that the cross-section of the second curved surface of the backlight module is a transition curve, so that the liquid crystal display panel subsequently assembled with the backlight module is curved to have the first curved surface, and the first curved edge includes a transition curve.

[0058] In a specific implementation, the curved backlight module includes a backplane. The backplane has a curved surface. The curvature of the backplane's curved surface is the same as the curvature of the second curved surface, and the corresponding curvature of the backplane's curved surface is also the same as the curvature of the first curved surface. In other words, the curvature of the backplane's curved surface determines the curvature of the display module's curved surface. The curved backplane can be made of metal, for example, and can be bent into a desired shape through a stamping process, resulting in a backplane with a gentle curve.

[0059] In specific implementation, the curved backlight module may also include structures such as light bars and optical modules arranged on the curved backplane. In this way, the structure arranged on the curved side of the backplane also has a corresponding curved surface, ultimately forming a curved backlight module.

[0060] In a specific implementation, a liquid crystal display panel includes an array substrate and a counter substrate disposed opposite each other, and a liquid crystal layer located between the array and counter substrates. The array substrate includes multiple sub-pixel units, each of which includes a thin-film transistor and a pixel electrode. The counter substrate includes a color filter and a black matrix. The color filter is located in the opening area of ​​the black matrix, and the color filter corresponds one-to-one with the sub-pixel unit. The counter substrate or array substrate also includes a common electrode.

[0061] Based on the same inventive concept, the present application also provides a method for preparing a curved display module, such as Figure 4 Shown, including:

[0062] S101, manufacturing a liquid crystal display panel; the liquid crystal display panel has a uniform thickness, and its light incident surface and light emitting surface are parallel at all locations;

[0063] S102 , bend the liquid crystal display panel so that both the light incident surface and the light emitting surface are first curved surfaces; wherein the first curved surface includes a pair of first curved edges arranged opposite to each other; and the first curved portion includes a curved portion with a continuously changing curvature.

[0064] In some embodiments, further comprising:

[0065] Producing a curved backlight module; wherein the curved backlight module has a second curved surface, and the curvature of the second curved surface is the same as that of the first curved surface;

[0066] The liquid crystal display panel is bent so that both the light incident surface and the light emitting surface are first curved surfaces, specifically comprising:

[0067] A liquid crystal display panel is fixed on one side of the curved backlight module having the second curved surface, so that the light incident surface and the light emitting surface of the liquid crystal display panel are bent into the first curved surface.

[0068] In specific implementation, a flat-panel LCD panel and a curved backlight module with the required curvature can be first manufactured, and the LCD panel and the curved backlight module can be assembled so that the light-emitting surface and the light-incident surface of the assembled LCD panel are curved into a first curved surface.

[0069] In some embodiments, before manufacturing the curved backlight module, the process further includes:

[0070] Providing a flexible display module for testing, and controlling the flexible display module for testing to be in a naturally curved state so that the curved edge of the flexible display module for testing includes a gentle curve;

[0071] Measuring the bending curve of the curved edge of the test flexible display module in a naturally bent state;

[0072] The curved curve is fitted to obtain a polynomial curve; the first curved portion and the curved portion included in the second curved surface are both at least partial areas of the polynomial curve.

[0073] In this way, the curvature of the second curved surface of the curved backlight module can be designed based on the obtained polynomial curve. For example, the curvature of the back plate included in the curved backlight module can be designed. The dimensions of the various components of the curved backlight module and the display module can also be designed.

[0074] In specific implementation, Figure 5 As shown, the flexible display module for testing includes: two side edges 3 arranged opposite to each other along the X direction. In the initial state, the light incident surface and the light emitting surface of the flexible display module for testing are both planes 4 ( Figure 5 Only one of the planes 4 is shown), in the X direction, the distance between the two side edges 3 is L0; in the natural bending state, the light incident surface and the light emitting surface of the test flexible display module are both curved surfaces 5 ( Figure 5 Only one of the curved surfaces 5 is shown. In the X direction, the distance between the two side edges 3 is L1; wherein L1 <L0。需要说明的是,L1不同,则自然弯曲状态下得到的测试用可弯曲显示模组的曲线边的弯曲曲线不同,之后对弯曲曲线进行拟合得到的多项式也不同。

[0075] In a specific implementation, the bending curve of the curved edge of the test flexible display module in a naturally curved state is measured, for example, Figure 5 As shown, according to Figure 5 The curve shown in the figure is fitted to obtain a polynomial curve as shown in Figure 6 As shown, the polynomial satisfied by the curve is: y = 0.2995 x 6 +0.2093·x 5 +1.6434·x 4 –0.5584·x 3 –43.3855·x 2 .

[0076] In some embodiments, measuring the bending curve of the curved edge of the test flexible display module in a naturally bent state specifically includes:

[0077] A three-dimensional measuring instrument is used to measure the bending curve of the curved edge of the test flexible display module in a naturally curved state.

[0078] In the specific implementation, after measurement with a three-dimensional measuring instrument, a two-dimensional CAD graphic and a data table containing the coordinates of each point can be output. The data table of the measured coordinates of each point can be used to fit a polynomial of the matching curve, and the polynomial can be processed into a symmetrical result. In the specific implementation, the curve and polynomial fitted by Matlab can be used.

[0079] An embodiment of the present application provides a display device, which includes a display module provided by an embodiment of the present application.

[0080] The display device provided in the embodiments of this application is any product or component with a display function, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigation system. Other essential components of the display device are well understood by those skilled in the art and are not described here in detail, nor should they be construed as limitations of this application. The implementation of the display device can be referenced to the above-described embodiments of the display module, and any repetitive details will not be repeated.

[0081] To sum up, the display module and its preparation method, and the display device provided in the embodiments of the present application, the liquid crystal display panel is a curved liquid crystal display panel, the light incident surface and the light output surface of the curved liquid crystal display panel are both first curved surfaces, the first curved surface includes a first curved edge, the curvature of the curved portion included in the first curved edge changes continuously, that is, the curved portion is a gentle curve, so that there is no stress concentration point on the curved portion, and the shape of any corresponding cross-section facing the first curved surface parallel to the first curved edge is the same as the first curved edge, that is, the cross-section also includes a curved portion with a continuously changing curvature of the domain, and there is no stress concentration area on the first curved surface, which can avoid light leakage of the curved liquid crystal display panel caused by stress concentration and improve the display effect of the display module.

[0082] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0083] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. A display module, characterized in that: The display module includes a liquid crystal display panel; the liquid crystal display panel has a uniform thickness, a light incident surface and a light emitting surface thereof are parallel at all locations, and both the light incident surface and the light emitting surface of the liquid crystal display panel are first curved surfaces; the first curved surface includes a pair of first curved edges arranged opposite to each other, and the first curved edges include a curved portion with a continuously changing curvature; The curved portion includes a first portion and a second portion, wherein the first portion and the second portion are both gentle curves with continuously changing curvatures; In the first part, the curvature radius at any different position is different; In the second part, the curvature radius at any different position is different; The curved portion is a clothoid.

2. The display module according to claim 1, wherein: The curvature radius of the first part increases continuously from the connection point between the first part and the second part to the end point of the first part away from the connection point; the curvature radius of the second part increases continuously from the connection point to the end point of the second part away from the connection point.

3. The display module according to claim 2, wherein: The first portion is symmetrical to the second portion.

4. The display module according to any one of claims 1 to 3, wherein: The display module further includes: a curved backlight module; The liquid crystal display panel is located on the light-emitting side of the curved backlight module; The curved backlight module has a second curved surface, and the curvature of the second curved surface is the same as that of the first curved surface.

5. A method for preparing a display module, characterized in that: The method comprises: Manufacturing a liquid crystal display panel; the liquid crystal display panel has a uniform thickness, and its light incident surface and light emitting surface are parallel at all locations; The liquid crystal display panel is bent so that the light incident surface and the light emitting surface are both first curved surfaces; wherein the first curved surface includes a pair of first curved edges arranged opposite to each other; and the first curved portion includes a curved portion with a continuously changing curvature; The method further comprises: Manufacturing a curved backlight module; wherein the curved backlight module has a second curved surface, and the curvature of the second curved surface is the same as that of the first curved surface; Curving the liquid crystal display panel so that both the light incident surface and the light emitting surface are first curved surfaces specifically includes: Fixing the liquid crystal display panel on one side of the curved backlight module having the second curved surface, so that the light incident surface and the light emitting surface of the liquid crystal display panel are curved into a first curved surface; Before manufacturing the curved backlight module, the method further includes: Providing a flexible display module for testing, and controlling the flexible display module for testing to be in a naturally curved state so that the curved edge of the flexible display module for testing includes a gentle curve; measuring a bending curve of a curved edge of the test flexible display module in a naturally bent state; The curved curve is fitted to obtain a polynomial curve; wherein the first curved portion and the curved portion included in the second curved surface are both at least partial areas of the polynomial curve.

6. A display device, characterized in that: The display device comprises the display module according to any one of claims 1 to 4.

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