CN110376792B - Display device and method for manufacturing display device - Google Patents

Display device and method for manufacturing display device Download PDF

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Publication number
CN110376792B
CN110376792B CN201910659298.XA CN201910659298A CN110376792B CN 110376792 B CN110376792 B CN 110376792B CN 201910659298 A CN201910659298 A CN 201910659298A CN 110376792 B CN110376792 B CN 110376792B
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diffusion
display device
yellow
light
bending region
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CN110376792A (en
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李植强
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Xiamen Tianma Microelectronics Co Ltd
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Xiamen Tianma Microelectronics Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133611—Direct backlight including means for improving the brightness uniformity
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Planar Illumination Modules (AREA)

Abstract

The invention provides a display device and a method of manufacturing the display device. The display device comprises a first bending area and a second bending area, wherein the first bending area surrounds the second bending area; the display device also comprises a backlight module and a liquid crystal display panel positioned on the light-emitting side of the backlight module; the backlight module comprises a plurality of backlight sources and diffusion plates which are arranged in an array manner; the diffusion plate comprises a first diffusion part positioned in the first bending area and a second diffusion part positioned in the second bending area; the second diffusion portion appears yellow. The display device provided by the invention has improved display uniformity.

Description

Display device and method for manufacturing display device
[ technical field ] A method for producing a semiconductor device
The present invention relates to the field of display technologies, and in particular, to a display device and a method for manufacturing the display device.
[ background of the invention ]
The mainstream display panel includes a liquid crystal display panel. The liquid crystal display panel forms an electric field capable of controlling the deflection of liquid crystal molecules by applying voltages to the pixel electrode and the common electrode, and further controls the transmission of light rays to realize a display function. With the application of the bendable electronic device, the bendable liquid crystal display panel becomes a hot spot. However, the liquid crystal display panel is deformed when bent, resulting in poor display uniformity.
[ summary of the invention ]
In order to solve the above-described technical problems, the present invention provides a display device and a method of manufacturing the display device.
In a first aspect, the present invention provides a display device, including a first bending region and a second bending region, wherein the first bending region surrounds the second bending region;
the display device also comprises a backlight module and a liquid crystal display panel positioned on the light-emitting side of the backlight module;
the backlight module comprises a plurality of backlight sources and diffusion plates which are arranged in an array manner;
the diffusion plate comprises a first diffusion part positioned in the first bending area and a second diffusion part positioned in the second bending area;
the second diffusion portion appears yellow.
In a second aspect, the present invention provides a method of manufacturing a display device, for manufacturing the display device;
the manufacturing method of the display device includes: the diffuser plate is formed by at least two injection moldings with different injection molding temperatures.
In the invention, the display device comprises a first bending area and a second bending area, wherein the first bending area surrounds the second bending area, and the display device also comprises a backlight module and a liquid crystal display panel positioned on the light-emitting side of the backlight module; the backlight module comprises a plurality of backlight sources and diffusion plates which are arranged in an array manner; the diffusion plate comprises a first diffusion part positioned in the first bending area and a second diffusion part positioned in the second bending area. According to the invention, the second diffusion part positioned in the second bending area is set to be yellow, so that the image presented by the second bending area of the display device is yellow, and is consistent with the color cast of the image presented by the first bending area of the display device, and the display uniformity of the display device is improved.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic perspective view of a curved display device in the prior art;
FIG. 2 is a schematic cross-sectional view of a curved display device according to the prior art;
fig. 3 is a schematic perspective view of a display device according to an embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view of the display device of FIG. 3 at AA';
FIG. 5 is a diagram illustrating a relationship between a light transmittance and a light phase difference of a liquid crystal display panel in a display device according to an embodiment of the present invention;
fig. 6 is a schematic perspective view of another display device provided in an embodiment of the present invention;
FIG. 7 is a schematic cross-sectional view of the display device of FIG. 6 at BB';
FIG. 8 is a schematic cross-sectional view of another display device provided in an embodiment of the invention;
fig. 9 is a schematic perspective view of another display device provided in an embodiment of the present invention;
FIG. 10 is a schematic cross-sectional view of the display device of FIG. 9 at CC';
fig. 11 is a schematic flow chart illustrating a method for manufacturing a display device according to an embodiment of the present invention;
FIG. 12 is a schematic flow chart illustrating a method for manufacturing a display device according to another embodiment of the present invention;
fig. 13 is a schematic flow chart illustrating another method for manufacturing a display device according to an embodiment of the present invention.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that although the terms first, second, etc. may be used herein to describe devices in accordance with embodiments of the present invention, these devices should not be limited by these terms. These terms are only used to distinguish one device from another. For example, a first device may also be referred to as a second device, and similarly, a second device may also be referred to as a first device, without departing from the scope of embodiments of the present invention.
Fig. 1 is a schematic perspective view of a curved display device in the prior art; fig. 2 is a schematic cross-sectional view of a curved display device in the prior art.
As shown in fig. 1 and 2, in the prior art, the curved display device 100 includes a curved backlight module 110 and a curved liquid crystal display panel 120. The conventional curved liquid crystal display panel 120 is generally manufactured by first manufacturing a color film substrate and an array substrate in a planar state, then combining the color film substrate and the array substrate to form a liquid crystal display panel in the planar state, and then bending the liquid crystal display panel in the planar state to form the curved liquid crystal display panel 120. The curved display device 100 further includes an edge display area 101 and a central display area 102. However, the edge display region 101 is yellowish, so that the curved display device 100 has poor display uniformity.
In order to solve the above-described technical problems, the present invention provides a display device and a method of manufacturing the display device.
Fig. 3 is a schematic perspective view of a display device according to an embodiment of the present invention; FIG. 4 is a schematic cross-sectional view of the display device of FIG. 3 at AA'; fig. 5 is a schematic diagram illustrating a relationship between a light transmittance and a light phase difference of a liquid crystal display panel in a display device according to an embodiment of the invention.
As shown in fig. 3 and 4, the display device 200 includes a first bending region 201 and a second bending region 202, wherein the first bending region 201 surrounds the second bending region 202; the display device 200 further comprises a backlight module 210 and a liquid crystal display panel 220 positioned at the light-emitting side of the backlight module 210; the backlight module 210 includes a plurality of backlight sources 211 and a diffusion plate 212 arranged in an array; the diffusion plate 212 includes a first diffusion part 212A located in the first bending region 201 and a second diffusion part 212B located in the second bending region 202; the second diffusion portion 212B appears yellow.
As shown in fig. 3 to 5, since the curved liquid crystal display panel 220 has different degrees of curvature, in addition to the stress concentration around the liquid crystal display panel 220, especially the stress concentration at the edge position of the first bending region 201 is the most severe, which results in a larger difference between the cell thickness at the position and the middle region of the second bending region 202. The effect of box thickness variation on color shift is briefly described below using fig. 5 as an example: the liquid crystal molecules are rod-shaped, and different molecular alignment patterns correspond to different optical anisotropies. The optical refractive index of the liquid crystal molecules is different in size along the long axis and the short axis, and the refractive index component along the long axis of the liquid crystal molecules is generally defined as n/n, the refractive index component perpendicular to the long axis of the liquid crystal molecules is n ═ n/, n ″, and the difference between the two is also referred to as the effective direction of the refractive index of the liquid crystal layer. When light passes through the liquid crystal molecules, birefringence occurs, and two beams of light are generated, which have a phase difference Δ n · d (also called effective optical path difference, where d refers to the thickness of the liquid crystal layer). Referring to fig. 5, fig. 5 is a graph of effective optical path difference Δ n · d versus transmittance. With the change of the effective optical path difference, the transmittance ratio of the three monochromatic lights of R (red), G (green), and B (blue) also changes, and generally, we will set Δ n · d at the point with higher transmittance, such as 235-305 nm. When the temperature is constant, Δ n is constant, and the liquid crystal layer thickness d increases, so Δ n · d increases. As is clear from fig. 5, when Δ n · d increases, the transmittance of blue light decreases faster than the transmittance of green light and red light, and therefore the displayed screen becomes yellowish. Therefore, since the stress concentration at the edge position in the first bending region 201 is the most severe, the thickness of the liquid crystal cell at that position is increased, and the yellowing problem occurs at that position, and the display quality is significantly reduced. Since the current backlight light source usually employs white LEDs, the image color of the final display device 200 at the edge of the first bending region 201 is yellowish.
In the embodiment of the present invention, the second diffusion portion 212B has a yellow color, where yellow is a color of light having a wavelength of 570 nm to 600 nm. In the display device 200, the first bending region 201 surrounds the second bending region 202; that is, the first bending region 201 is an edge region of the display device 200, and the second bending region 202 is a non-edge region of the display device 200. In the first bending region 201 and the second bending region 202, the liquid crystal display panel 220 is located at the light-emitting side of the backlight module 210; then, the backlight module 210 emits backlight light at the first bending region 201 and the second bending region 202, and the backlight light passes through the liquid crystal display panel 220, so that the display device 200 displays images at the first bending region 201 and the second bending region 202. On the one hand, the liquid crystal display panel 220 is bent at the first bending region 201 and the second bending region 202, and the stress of the bent liquid crystal display panel 220 at the first bending region 201 is more concentrated, so that the difference between the thickness of the liquid crystal cell and other related parameters at the position and the second bending region 202 is larger, and thus the image displayed by the display device 200 in the first bending region 201 is yellow. On the other hand, in the backlight module 210, the backlight light sources 211 arranged in an array emit white backlight light at the first bending region 201 and the second bending region 202, and further the backlight light of the first bending region 201 and the second bending region 202 passes through the diffusion plate 212. The diffusion plate 212 includes a first diffusion part 212A located in the first bending region 201 and a second diffusion part 212B located in the second bending region 202 and appearing yellow. Then, the backlight light of the second bending area 202 is changed into a yellow bias light after passing through the second diffusion portion 212B, and the yellow bias light is emitted from the liquid crystal display panel 220 located in the second bending area 202, so that the finally displayed image of the display device 200 at the second bending area 202 is also yellow. Therefore, the images displayed by the display device 200 at the first bending region 201 and the second bending region 202 are yellowish, so that the display uniformity of the display device 200 is improved.
As shown in fig. 3 and 4, the first diffusion portion 212A appears white.
In the embodiment of the invention, since the first diffusion part 212A of the diffusion plate 212 located in the first bending region 201 is white, and the backlight light source 211 is a white light source, the white backlight light is emitted from the first diffusion part 212A. Accordingly, the white backlight light of the first bending region 201 is incident to the liquid crystal display panel 220. However, the stress of the bent lcd panel 220 at the first bending region 201 is more concentrated, which results in a larger difference between the cell thickness and other related parameters at the first bending region 201 and the second bending region 202, such that when the white backlight light of the first bending region 201 is incident on the lcd panel 220, the image displayed by the display device 200 at the first bending region 201 is yellow. Meanwhile, in the backlight module 210, the second diffusion portion 212B located in the second bending region 202 is yellow. Then, the backlight light of the second bending area 202 is changed into a yellow light after passing through the second diffusing portion 212B, and the yellow light is emitted from the liquid crystal display panel 220 located in the second bending area 202, so that the finally displayed image of the display device 200 at the second bending area 202 is also yellow. Therefore, the images displayed by the display device 200 at the first bending region 201 and the second bending region 202 are yellowish, so that the display uniformity of the display device 200 is improved.
As shown in fig. 3 and 4, the light emitted from the backlight light source 211 passes through the first diffuser 212A to become a first diffused light L1, the light emitted from the backlight light source 211 passes through the second diffuser 212B to become a second diffused light L2, the first diffused light L1 is a white light, and the second diffused light L2 is a yellow light.
In the embodiment of the present invention, the second diffused light L2 is yellow light, where the yellow light refers to light with a wavelength of 570 nm to 600 nm. On the one hand, the light emitted from the backlight light source 211 at the first bending region 201 is changed into white first diffused light L1 through the first diffusing part 212A. Then, the white first diffused light L1 in the first bending region 201 exits from the backlight module 210 and enters the liquid crystal display panel 220. However, the stress of the bent lcd panel 220 at the first bending region 201 is more concentrated, which results in a larger difference between the cell thickness and other related parameters at the first bending region 201 and the second bending region 202, such that when the white first diffused light L1 in the first bending region 201 is incident on the lcd panel 220, the image displayed by the display device 200 at the first bending region 201 is yellow. On the other hand, at the second bending region 202, the light emitted from the backlight light source 211 passes through the second diffusing portion 212B to become a second diffused light L2 that is yellowish. Then, after the second diffused light L2 with a yellow color in the second bending region 202 exits from the backlight module 210 and exits from the liquid crystal display panel 220 located in the second bending region 202, the image finally displayed by the display device 200 at the second bending region 202 is also yellow. Therefore, the images displayed by the display device 200 at the first bending region 201 and the second bending region 202 are yellowish, so that the display uniformity of the display device 200 is improved.
Fig. 6 is a schematic perspective view of another display device provided in an embodiment of the present invention; fig. 7 is a schematic cross-sectional view of the display device of fig. 6 at BB'.
As shown in fig. 6 and 7, the first diffusion portion 212A at least partially exhibits yellow, and the yellow saturation of the first diffusion portion 212A is smaller than that of the second diffusion portion 212B.
In the embodiment of the invention, the yellow saturation refers to the shade degree of yellow; the greater the yellow saturation, the darker the yellow; the smaller the yellow saturation, the lighter the yellow. Optionally, the ratio of the surface area of the first inflection region 201 to the surface area of the second inflection region 202 is between 2:8 and 3: 7. The first diffusion portion 212A in the first inflection region 201 at least partially exhibits a yellow color, and the yellow saturation of the first diffusion portion 212A is less than the yellow saturation of the second diffusion portion 212B. Specifically, the first bending region 201 includes a first bending region 201A far away from the second bending region 202 and a first second bending region 201B near the second bending region 202, and a portion 212A-1 of the first diffusion portion 212A that does not appear yellow is located in the first bending region 201A, and at the same time, a portion 212A-2 of the first diffusion portion 212A that appears yellow is located in the first second bending region 201B; that is, a portion 212A-2 of the first diffusion portion 212A located in the first second inflection region 201B appears yellow, and a portion 212A-1 of the first diffusion portion 212A located in the first inflection region 201A appears white, while a yellow saturation of the portion 212A-2 of the first diffusion portion 212A located in the first second inflection region 201B is less than a yellow saturation of the second diffusion portion 212B. On the one hand, the yellow saturation of the portion 212A-2 of the first diffusion portion 212A located at the first inflection region 201B is small, and the yellow saturation of the second diffusion portion 212B is large at the second inflection region 202; that is, a portion 212A-2 of the first diffusion portion 212A located in the first second bend region 201B is shallowly yellowish, and the second diffusion portion 212B is deeply yellowish at the second bend region 202. Accordingly, the backlight ray of the backlight module 210 at the first bending region 201B is more shallow and yellow, and the backlight ray of the backlight module 210 at the second bending region 202 is more deep and yellow. On the other hand, the stress concentration of the first second bending region 201B is severe compared with that of the second bending region 202, so that the liquid crystal cell thickness of the first second bending region 201B is increased compared with that of the second bending region 202, and therefore, the backlight light of the first second bending region 201B is changed from being slightly yellow to being deeply yellow after passing through the liquid crystal display panel 220, and the backlight light of the second bending region 202 is still slightly yellow after passing through the liquid crystal display panel 220; that is, the light emitted from the liquid crystal display panel 220 located in the first second bending region 201B and the second bending region 202 is yellowish to the same extent. Accordingly, the images displayed by the display device 200 at the first and second bending regions 201 and 202 are both yellowish to the same extent, so that the display uniformity of the display device 200 is improved.
Fig. 8 is a schematic cross-sectional view of another display device according to an embodiment of the invention.
As shown in fig. 8, the yellow saturation of any position of the first diffusion portion 212A is inversely related to the distance from the position to the second diffusion portion 212B.
In the embodiment of the present invention, in the first inflection region 201, the yellow saturation of any one position in the first diffusion portion 212A is inversely related to the distance from the position to the second diffusion portion 212B. Specifically, the first diffusing portion 212A includes a first a diffusion position P1, a first b diffusion position P2; wherein the first diffusion position P1 has a greater distance to the second diffusion portion 212B, and the first diffusion position P1 has a lesser degree of yellow saturation; meanwhile, the distance from the first B diffusion position P2 to the second diffusion portion 212B is small, and the yellow saturation of the first B diffusion position P2 is large. In one aspect, the first diffusion position P1 has less yellow saturation and the first second diffusion position P2 has greater yellow saturation; that is, the first a diffusion position P1 is more pale yellow, and the first b diffusion position P2 is more deeply yellow. Thus, the backlight ray of the backlight module 210 at the first diffusion position P1 is light yellow, and the backlight ray of the backlight module 210 at the first second diffusion position P2 is dark yellow. On the other hand, the distance from the first diffusion position P1 to the second diffusion portion 212B is large, and the distance from the first second diffusion position P2 to the second diffusion portion 212B is small; that is, the first a diffusion position P1 is closer to the edge than the first b diffusion position P2; thus, the stress concentration of the first bending region 201 at the first diffusion position P1 is more severe than that of the first bending region 201 at the first second diffusion position P2, which results in a further increase in the cell thickness of the first diffusion position P1 compared to that of the first second diffusion position P2, thereby causing the backlight light at the first diffusion position P1 to change from being yellowish lighter to being yellowish deeper after passing through the liquid crystal display panel 220, and the backlight light at the first second diffusion position P2 to still be yellowish deeper after passing through the liquid crystal display panel 220; that is, the light emitted from the liquid crystal display panel 220 at the first diffusing position P1 is yellowish as the light emitted from the liquid crystal display panel 220 at the first second diffusing position P2. Thus, the images displayed by the display device 200 at different positions in the first bending region 201 are all yellowish to the same extent, so that the display uniformity of the display device 200 is further improved.
As shown in fig. 8, the curvature of the first inflection region 201 changes gradually, and the yellow saturation at any position of the first diffusion portion 212A is inversely related to the curvature at that position.
In the present embodiment, the curvature of the first bending region 201 is gradually changed. For example, the curvature of the first bending region 201 becomes gradually larger from the side close to the second bending region 202 to the side far from the second bending region 202. In the first inflection region 201, the yellow saturation at any position of the first diffusion portion 212A is inversely related to the curvature at that position. Specifically, the first diffusing portion 212A includes a first diffusing position P1, a first third diffusing position P3, and the distance from the first diffusing position P1 to the second diffusing portion 212B is equal to the distance from the first third diffusing position P3 to the second diffusing portion 212B; wherein the curvature of the first inflection region 201 is greater at the first nail diffusion position P1 and the yellow saturation is less at the first nail diffusion position P1; meanwhile, the curvature of the first inflection region 201 is smaller at the first propane diffusion position P3, and the yellow saturation is greater at the first propane diffusion position P3. In one aspect, the first diffusion position P1 has less yellow saturation and the first third diffusion position P3 has greater yellow saturation; that is, the first nail diffusion position P1 is more pale yellow, and the first nail diffusion position P3 is more deeply yellow. Thus, the backlight ray of the backlight module 210 at the first diffusing position P1 is light yellow, and the backlight ray of the backlight module 210 at the first second diffusing position P3 is dark yellow. On the other hand, the curvature of the first inflection region 201 is larger at the first diffusion position P1, and the curvature of the first inflection region 201 is smaller at the first second diffusion position P3; thus, the stress concentration of the first bending region 201 at the first diffusion position P1 is more severe than that of the first bending region 201 at the first third diffusion position P3, which results in a further increase in the cell thickness of the first diffusion position P1 compared to that of the first third diffusion position P3, thereby causing the backlight light at the first diffusion position P1 to change from being yellowish lighter to being yellowish deeper after passing through the liquid crystal display panel 220, and the backlight light at the first third diffusion position P3 to still be yellowish deeper after passing through the liquid crystal display panel 220; that is, the light emitted from the liquid crystal display panel 220 at the first diffusing position P1 is yellowish as the light emitted from the liquid crystal display panel at the first second diffusing position P3. Thus, the images displayed by the display device 200 at different positions in the first bending region 201 are all yellowish to the same extent, so that the display uniformity of the display device 200 is further improved.
As shown in fig. 6 and 7, the light emitted by the backlight light source 211 is changed into a first diffused light L1 through the first diffusion part 212A, the light emitted by the backlight light source 211 is changed into a second diffused light L2 through the second diffusion part 212B, at least a part of the first diffused light L1 is yellow light and the second diffused light L2 is yellow light, and the yellow saturation of the first diffused light L1 is less than that of the second diffused light L2.
In the embodiment of the invention, the light emitted by the backlight light source 211 in the first bending region 201 passes through the first diffusing part 212A to become the first diffused light L1. The light emitted from the backlight light source 211 in the second bending region 202 passes through the second diffusing portion 212B to become a second diffused light L2. A part of the first diffused light L1 is yellow light and the second diffused light L2 is yellow light. The yellow saturation of the yellowish part of the first diffused light ray L1 is less than the yellow saturation of the second diffused light ray L2. Specifically, the first bending region 201 includes a first bending region 201A far from the second bending region 202 and a second bending region 201B near the second bending region 202. A portion 212A-1 of the first diffusing portion 212A located in the first fold region 201A emits a white portion L1-1 of the first diffused light L1, and a portion 212A-2 of the first diffusing portion 212A located in the first second fold region 201B emits a yellowish portion L1-2 of the first diffused light L1; meanwhile, the yellow saturation of the yellowish part L1-2 of the first diffused light ray L1 emitted from the part 212A-2 of the first diffusion part 212A located in the first bending region 201B is less than the yellow saturation of the second diffused light ray L2 emitted from the second diffusion part 212B. On the one hand, a part 212A-2 of the first diffusing part 212A located at the first second inflection region 201B emits a yellowish part L1-2 of the first diffused light L1 having a small saturation of yellow, and a second diffusing part 212B at the second inflection region 202 emits a second diffused light L2 having a large saturation of yellow; that is, the portion 212A-2 of the first diffusion portion 212A located at the first second fold region 201B shallowly emits the yellowish portion L1-2 of the first diffused light L1, and the second diffusion portion 212B at the second fold region 202 deeply emits the yellowish second diffused light L2. Accordingly, the backlight ray of the backlight module 210 at the first bending region 201B is more shallow and yellow, and the backlight ray of the backlight module 210 at the second bending region 202 is more deep and yellow. On the other hand, the stress concentration of the first second bending region 201B is severe compared with that of the second bending region 202, so that the liquid crystal cell thickness of the first second bending region 201B is increased compared with that of the second bending region 202, and therefore, the backlight light of the first second bending region 201B is changed from being slightly yellow to being deeply yellow after passing through the liquid crystal display panel 220, and the backlight light of the second bending region 202 is still slightly yellow after passing through the liquid crystal display panel 220; that is, the light emitted from the liquid crystal display panel 220 located in the first second bending region 201B and the second bending region 202 is yellowish. Accordingly, the images displayed by the display device 200 at the first and second bending regions 201 and 202 are both yellowish to the same extent, so that the display uniformity of the display device 200 is improved.
Fig. 9 is a schematic perspective view of another display device provided in an embodiment of the present invention; fig. 10 is a schematic cross-sectional view of the display device of fig. 9 at CC'.
As shown in fig. 9 and 10, the display device 200 includes a first bending region 201 and a second bending region 202, the first bending region 201 includes a corner bending region 201A and an edge bending region 201B outside the corner bending region 201A; the display device 200 further comprises a backlight module 210 and a liquid crystal display panel 220 positioned at the light-emitting side of the backlight module 210; the backlight module 210 includes a plurality of backlight sources 211 and a diffusion plate 212 arranged in an array; the diffusion plate 212 includes a first diffuser 212A located at the corner bending region 201A and a second diffuser 212B located at the edge bending region 201B and the second bending region 202; the second diffusion portion 212B appears yellow.
In the embodiment of the invention, in the display device 200, the corner bending area 201A is a corner area of the display device 200. In the corner bending region 201A, the edge bending region 201B and the second bending region 202, the liquid crystal display panel 220 is located at the light-emitting side of the backlight module 210; therefore, the backlight module 210 emits backlight light at the corner bending region 201A, the edge bending region 201B and the second bending region 202, and the backlight light of the corner bending region 201A, the edge bending region 201B and the second bending region 202 passes through the liquid crystal display panel 220, so that the display device 200 displays images at the corner bending region 201A, the edge bending region 201B and the second bending region 202. On the one hand, the liquid crystal display panel 220 is bent at the corner bending area 201A, the edge bending area 201B and the second bending area 202, and the stress of the bent liquid crystal display panel 220 at the corner bending area 201A is more concentrated, so that the difference between the liquid crystal box thickness and other related parameters at the corner bending area 201A and the edge bending area 201B and the second bending area 202 is larger, and thus, an image displayed by the display device 200 at the corner bending area 201A is yellowish. On the other hand, in the backlight module 210, the backlight light sources 211 arranged in an array emit white backlight light at the corner bending region 201A, the edge bending region 201B and the second bending region 202, and the backlight light of the corner bending region 201A, the edge bending region 201B and the second bending region 202 passes through the diffusion plate 212. The diffusion plate 212 includes a first diffusion part 212A located in the corner bending region 201A and a second diffusion part 212B located in the edge bending region 201B and the second bending region 202 and presenting a yellow color. Then, the backlight light of the edge bending region 201B and the second bending region 202 is changed into a yellow bias light after passing through the second diffusion portion 212B, and the yellow bias light is emitted from the liquid crystal display panel 220 located in the edge bending region 201B and the second bending region 202, so that the finally displayed image of the display device 200 at the edge bending region 201B and the second bending region 202 is also yellow. Therefore, the images displayed on the display device 200 at the corner bending region 201A, the edge bending region 201B, and the second bending region 202 are all yellowish, and the display uniformity of the display device 200 is improved. Alternatively, the yellow saturation of any position of the first diffusion portion 212A is inversely related to the distance from the position to the second diffusion portion 212B. Thus, the images displayed by the display device 200 at different positions in the corner bending region 201A are all yellowish to the same extent, so that the display uniformity of the display device 200 is further improved.
Fig. 11 is a flowchart illustrating a method for manufacturing a display device according to an embodiment of the invention.
As shown in fig. 3, 4, and 11, a method 300 of manufacturing a display device is used to manufacture the display device 200; the method 300 of manufacturing a display device includes: s400, the diffusion plate 212 is formed through at least two times of injection molding with different injection molding temperatures.
In the embodiment of the present invention, injection molding refers to an injection molding process. In the injection molding process, a polymer raw material is first placed in an injection molding machine for heating and plasticizing, and then a polymer melt is injected into a mold for cooling and molding. The injection molding temperature is the temperature at which the polymer feedstock is placed in an injection molding machine for heating and plasticizing in the injection molding process. The diffusion plate 212 is formed by at least two times of injection molding with different injection molding temperatures; that is, first, the first diffuser portion 212A is formed by the first injection, and then, the second diffuser portion 212B is formed by the second injection, and the injection temperature of the first injection is different from the injection temperature of the second injection. The second diffuser portion 212B thus injection-molded may appear yellow. Then, the backlight light of the second bending region 202 is changed into a yellow light after passing through the second diffusion portion 212B, and the yellow light is emitted from the liquid crystal display panel 220 located in the second bending region 202, so that the image finally displayed by the display device 200 at the second bending region 202 is yellow. Meanwhile, the stress of the bent lcd panel 220 at the first bending region 201 is more concentrated, so that the difference between the thickness of the lcd cell and other related parameters at the first bending region 201 and the second bending region 202 is larger, and the image displayed by the display device 200 at the first bending region 201 is yellow. Therefore, the images displayed by the display device 200 at the first bending region 201 and the second bending region 202 are yellowish, so that the display uniformity of the display device 200 is improved.
Fig. 12 is a schematic flowchart of another method for manufacturing a display device according to an embodiment of the invention.
As shown in fig. 3, 4, and 12, forming the diffusion plate 212 by at least two injection moldings with different injection molding temperatures includes: S410A, forming a second diffusion part 212B through first injection molding at the injection molding temperature of 350-360 ℃; S420A, forming the first diffusion part 212A through the second injection with the injection temperature of 345-350 ℃.
In the embodiment of the invention, the second diffuser portion 212B is formed by the first injection at an injection temperature of 350 degrees celsius or more and 360 degrees celsius or less, and the first diffuser portion 212A is formed by the second injection at an injection temperature of 345 degrees celsius or more and 350 degrees celsius or less. The first diffusing portion 212A and the second diffusing portion 212B thus injection-molded appear white and yellow, respectively. Since the first diffusion part 212A located in the first bending region 201 is white and the backlight light source 211 is a white light source, white backlight light is emitted from the first diffusion part 212A. Accordingly, the white backlight light of the first bending region 201 is incident to the liquid crystal display panel 220. However, the stress of the bent lcd panel 220 at the first bending region 201 is more concentrated, which results in a larger difference between the cell thickness and other related parameters at the first bending region 201 and the second bending region 202, such that when the white backlight light of the first bending region 201 is incident on the lcd panel 220, the image displayed by the display device 200 at the first bending region 201 is yellow. Meanwhile, in the backlight module 210, the second diffusion portion 212B located in the second bending region 202 is yellow. Then, the backlight light of the second bending area 202 is changed into a yellow light after passing through the second diffusing portion 212B, and the yellow light is emitted from the liquid crystal display panel 220 located in the second bending area 202, so that the finally displayed image of the display device 200 at the second bending area 202 is also yellow. Therefore, the images displayed by the display device 200 at the first bending region 201 and the second bending region 202 are yellowish, so that the display uniformity of the display device 200 is improved.
Fig. 13 is a schematic flow chart illustrating another method for manufacturing a display device according to an embodiment of the present invention.
As shown in fig. 6, 7, and 13, forming the diffusion plate 212 by at least two injection moldings with different injection molding temperatures includes: S410B, forming a second diffusion part 212B through first injection molding at the injection molding temperature of 350-360 ℃; S420B, the first diffusion part 212A is formed by multiple times of injection molding with the injection temperature of 350-360 ℃ or 345-350 ℃.
In the embodiment of the invention, the second diffuser portion 212B is formed by first injection molding at an injection temperature of 350 degrees celsius or more and 360 degrees celsius or less; the first diffuser portion 212A is formed by multiple injection molding at an injection temperature of 350 degrees celsius or more and 360 degrees celsius or 345 degrees celsius or more and less than 350 degrees celsius. Specifically, first, the non-yellowish part of the first diffuser portion 212A is formed by injection at an injection temperature of 345 degrees celsius or more and 350 degrees celsius or less, and the yellowish part of the first diffuser portion 212A is formed by injection at an injection temperature of 350 degrees celsius or more and 360 degrees celsius or less; subsequently, the second diffuser portion 212B formed by injection molding at an injection molding temperature of 350 degrees celsius or more and 360 degrees celsius or less appears yellow. The injection temperature of the yellowish part in the first diffusing part 212A is lower than the injection temperature of the second diffusing part 212B. Thus, the yellow saturation of the yellowish part in the first diffusing portion 212A is small, and the yellow saturation of the second diffusing portion 212B is large; that is, the yellowish portion in the first diffusion portion 212A is shallowly yellowish, and the second diffusion portion 212B is deeply yellowish. Thus, the backlight light of the backlight module 210 on the yellow portion of the first diffuser 212A is more pale yellow, and the backlight light of the backlight module 210 on the second diffuser 212B is more deeply yellow. Meanwhile, the yellowish part in the first diffusion part 212A is closer to the edge than the second diffusion part 212B; thus, the stress concentration of the first bending region 201 at the yellowish part in the first diffusion 212A is more severe than that of the second bending region 202 at the second diffusion 212B, resulting in a further increase in the liquid crystal cell thickness on the yellowish part in the first diffusion 212A compared to that on the second diffusion 212B, resulting in a change from a lighter yellowish part to a deeper yellowish part of the backlight light on the yellowish part in the first diffusion 212A after passing through the liquid crystal display panel 220, and a deeper yellowish part of the backlight light on the second diffusion 212B after passing through the liquid crystal display panel 220; that is, the light emitted from the liquid crystal display panel 220 on the first diffuser 212A is yellowish as the light emitted from the liquid crystal display panel 220 on the second diffuser 212B. Accordingly, the image displayed on the display device 200 is yellow to the same extent, so that the display uniformity of the display device 200 is further improved. As shown in fig. 8, the yellow saturation of the first diffusing portion 212A is positively correlated with the injection temperature of the first diffusing portion 212A.
In the embodiment of the present invention, the injection temperature of the first diffusing portion 212A is greater than or equal to 350 degrees celsius and less than or equal to 360 degrees celsius, and the yellow saturation of the first diffusing portion 212A is positively correlated with the injection temperature of the first diffusing portion 212A; that is, the higher the injection temperature of the first diffusion portion 212A, the greater the yellow saturation of the first diffusion portion 212A; conversely, the lower the injection temperature of the first diffusion portion 212A, the lower the yellow saturation of the first diffusion portion 212A. Then, by adjusting the injection temperature of the first diffusion portion 212A, the yellow saturation of the first diffusion portion 212A can be adjusted so that the yellow saturation at any position of the first diffusion portion 212A is inversely related to the distance from the position to the second diffusion portion 212B, or so that the yellow saturation at any position of the first diffusion portion 212A is inversely related to the curvature of the position.
In summary, the present invention provides a display device and a method for manufacturing the display device. The display device comprises a first bending area and a second bending area, wherein the first bending area surrounds the second bending area; the display device also comprises a backlight module and a liquid crystal display panel positioned on the light-emitting side of the backlight module; the backlight module comprises a plurality of backlight sources and diffusion plates which are arranged in an array manner; the diffusion plate comprises a first diffusion part positioned in the first bending area and a second diffusion part positioned in the second bending area; the second diffusion portion appears yellow. The display device provided by the invention has improved display uniformity.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (9)

1. A display device is characterized by comprising a first bending area and a second bending area, wherein the first bending area surrounds the second bending area;
the display device also comprises a backlight module and a liquid crystal display panel positioned on the light-emitting side of the backlight module;
the backlight module comprises a plurality of backlight sources and diffusion plates which are arranged in an array manner;
the diffusion plate comprises a first diffusion part positioned in the first bending area and a second diffusion part positioned in the second bending area;
the second diffusion portion appears yellow;
the first diffusion portion appears white;
alternatively, the first and second electrodes may be,
the first diffusion portion exhibits a yellow color at least in part, the first diffusion portion having a yellow saturation that is less than the yellow saturation of the second diffusion portion.
2. The display device according to claim 1, wherein when the first diffusion portion appears white, light emitted from the backlight light source is changed into first diffused light by the first diffusion portion, light emitted from the backlight light source is changed into second diffused light by the second diffusion portion, the first diffused light is white light, and the second diffused light is yellow light.
3. The display device according to claim 1, wherein when the first diffusion portion at least partially assumes a yellow color, a yellow saturation at any position of the first diffusion portion is inversely related to a distance from the position to the second diffusion portion.
4. The display device according to claim 1, wherein when the first diffusion portion at least partially assumes a yellow color, a curvature of the first folded region gradually changes, and a saturation of the yellow color at any position of the first diffusion portion is inversely related to the curvature at that position.
5. The display device according to claim 1, wherein when the first diffusing portion at least partially has a yellow color, light emitted from the backlight light source is changed into first diffused light by the first diffusing portion, light emitted from the backlight light source is changed into second diffused light by the second diffusing portion, at least a part of the first diffused light is yellow light and the second diffused light is yellow light, and a yellow saturation of the first diffused light is smaller than a yellow saturation of the second diffused light.
6. A method for manufacturing a display device, characterized by manufacturing the display device according to claim 1;
the manufacturing method of the display device includes: the diffuser plate is formed by at least two injection moldings with different injection molding temperatures.
7. The method of manufacturing a display device according to claim 6, wherein the forming the diffusion plate by at least two injection moldings different in injection molding temperature includes:
forming the second diffusion part through first injection molding at the injection molding temperature of 350-360 ℃;
and forming the first diffusion part through second injection molding at 345-350 ℃.
8. The method of manufacturing a display device according to claim 6, wherein the forming the diffusion plate by at least two injection moldings different in injection molding temperature includes:
forming the second diffusion part through first injection molding at the injection molding temperature of 350-360 ℃;
the first diffusion part is formed by multiple times of injection molding at the injection temperature of 350-360 ℃ or 345-350 ℃.
9. The method of manufacturing a display device according to claim 8, wherein a yellow saturation of the first diffusing portion is positively correlated with an injection molding temperature of the first diffusing portion.
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