A 3D display device

Abstract

This invention discloses a 3D display device. In one specific embodiment, the 3D display device includes a display panel and a spacer layer and a grating layer sequentially stacked on the light-emitting side of the display panel. The edge region of the spacer layer near the surface of the display panel is provided with a light-shielding ink layer. This embodiment can effectively improve edge light leakage in the 3D display device, thereby enhancing the display effect.

Description

Technical Field

[0001] This invention relates to the field of display technology. More specifically, it relates to a 3D display device. Background Technology

[0002] The display principle of 3D display devices (or naked-eye 3D display devices) is to use a grating layer set on the light-emitting side of the display panel to display stereoscopic images. By separating the visible images of the left and right eyes, viewers can see 3D images.

[0003] In the 3D display device, a spacer layer is also provided between the display panel and the grating layer. In order to meet the optical design requirements of the product, the spacer layer needs to have a certain thickness so as to separate the grating layer from the display panel by a certain distance to achieve the 3D display effect.

[0004] The inventors discovered that existing 3D display devices have the problem of light leakage at the edges, especially for 3D display devices with liquid crystal display panels. Summary of the Invention

[0005] The purpose of this invention is to provide a 3D display device to solve at least one of the problems existing in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] The present invention provides a 3D display device, including a display panel and a spacer layer and a grating layer stacked sequentially on the light-emitting side of the display panel, wherein a light-shielding ink layer is provided on the edge region of the spacer layer near the surface of the display panel.

[0008] Optionally, in a first direction, the length of the spacer layer is greater than the length of the display panel, and the first direction is the direction from the center of the display panel to the edge.

[0009] Optionally, the display panel includes a display area and a non-display area surrounding the display area, wherein the non-display area is provided with a light-shielding layer.

[0010] Optionally, in the first direction, the length of the light-shielding ink layer is greater than or equal to D. min ;D min =D1+D2; D1 is the distance between the edge of the spacer layer and the edge of the display panel in the first direction; D2 is the distance between the edge of the display panel and the outer edge of the light-shielding layer in the first direction.

[0011] Optionally, in the first direction, the length of the light-shielding ink layer is less than or equal to D. max ;D max=D1+D3; D1 is the distance between the edge of the spacer layer and the edge of the display panel in the first direction; D3 is the distance between the edge of the display panel and the edge of the display area in the first direction.

[0012] Optionally, the display panel includes a display area and a non-display area surrounding the display area, and the 3D display device further includes an outer frame, the outer frame including a front frame extending along a second direction and located on the side of the grating layer away from the spacer layer, in the second direction, the length of the front frame is less than the distance between the edge of the display panel and the edge of the display area, the second direction being the direction in which the edge of the display panel points to the center.

[0013] Optionally, the spacer layer is bonded to the display panel via a first optical adhesive layer.

[0014] Optionally, the thickness of the first optical adhesive layer is greater than the thickness of the light-shielding ink layer.

[0015] Optionally, the spacer layer is spacer glass.

[0016] Optionally, the display panel is a liquid crystal display panel.

[0017] The beneficial effects of this invention are as follows:

[0018] The technical solution described in this invention can effectively improve edge light leakage in 3D display devices, thereby enhancing the display effect. It also has advantages such as not affecting the display area, low cost, simple manufacturing process, guaranteed product yield, and no impact on the bonding between the spacer layer and the display panel. Attached Figure Description

[0019] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0020] Figure 1 A schematic diagram of an existing 3D display device is shown.

[0021] Figure 2 Show Figure 1 The diagram shows an enlarged edge structure of an existing 3D display device.

[0022] Figure 3 A schematic diagram of an edge magnification structure is shown to improve the edge light leakage of a 3D display device.

[0023] Figure 4 This diagram illustrates another structural improvement for edge light leakage in 3D display devices.

[0024] Figure 5 This diagram illustrates the enlarged edge structure of the 3D display device provided in an embodiment of the present invention.

[0025] Figure 6 This diagram illustrates the distance between the spacer layer and the edge of the liquid crystal display panel in the 3D display device provided in an embodiment of the present invention. Detailed Implementation

[0026] In this invention, "on," "formed on," and "set on" can mean that one layer is directly formed or set on another layer, or that one layer is indirectly formed or set on another layer, meaning that there are other layers between the two layers.

[0027] It should be noted that although the terms "first," "second," etc., may be used herein to describe various components, members, elements, regions, layers, and / or portions, these components, members, elements, regions, layers, and / or portions should not be limited by these terms. Rather, these terms are used to distinguish one component, member, element, region, layer, and / or portion from another. Thus, for example, the first component, first member, first element, first region, first layer, and / or first portion discussed below may be referred to as a second component, second member, second element, second region, second layer, and / or second portion without departing from the teachings of the invention.

[0028] In this invention, unless otherwise stated, the term "co-layer arrangement" refers to two layers, components, members, elements, or portions that can be formed by the same fabrication process (e.g., patterning process), and that these two layers, components, members, elements, or portions are generally formed of the same material. For example, co-layer arrangement of two or more functional layers means that these co-layered functional layers can be formed using the same material layer and the same fabrication process, thereby simplifying the fabrication process of the display substrate.

[0029] In this invention, unless otherwise stated, the term "patterning process" generally includes steps such as photoresist coating, exposure, development, etching, and photoresist stripping. The term "one-step patterning process" refers to a process of forming patterned layers, components, or parts using a single photomask.

[0030] The inventors discovered that existing 3D display devices suffer from edge light leakage, particularly those using liquid crystal display panels. Taking a 3D display device with a liquid crystal display panel as an example... Figure 1As shown, it includes a backlight module 101, a liquid crystal display panel 102, a spacer layer 103, a grating layer 104, and an outer frame. The grating layer 104 includes a lenticular lens array composed of lenticular lenses arranged in an array. The outer frame includes a front frame 1051 and a rear frame 1052. The liquid crystal display panel 102 includes a display area 1021 and a non-display area surrounding the display area. The non-display area is provided with a light-shielding layer, such as a black matrix layer BM. The light-shielding layer is usually designed not to completely cover the non-display area. The outer edge of the light-shielding layer and the edge of the liquid crystal display panel 102 (the edge of the liquid crystal display panel 102 is the outer edge of the non-display area 1022) are a certain distance apart in the direction from the center of the liquid crystal display panel 102 to the edge, usually 0.2mm-0.3mm, thereby forming an unshielded area in the outer edge region of the non-display area 1022. The inventors discovered that this is the reason for edge light leakage in 3D display devices. For 2D display devices without a spacer layer, the outer frame, including the front frame, can almost completely block the backlight leaking from the unshielded areas of the liquid crystal display panel. However, for 3D display devices, such as... Figure 2 As shown, due to the presence of the spacer layer 103, the front frame 1051 cannot block the backlight leaking from the unshielded area in the non-display area 1022 of the liquid crystal display panel 102.

[0031] Furthermore, the inventors experimented with some structural designs to address the edge light leakage problem in 3D display devices, such as:

[0032] One approach is to lengthen the front bezel 1051 in the direction from the edge of the liquid crystal display panel 102 towards the center, so that the lengthened front bezel can block the backlight leaking from the unshielded area of ​​the liquid crystal display panel 102. However, if... Figure 3 As shown, the inventors found that this method would cause the extended front frame 1051-1 to block the display area 1021, resulting in a missing display image. Furthermore, light leakage would still occur when viewed at close range or from a large angle. In addition, this method also has the problems of increased cost due to the increased weight of the outer frame, as well as increased overall product weight and decreased product stability.

[0033] Another way is, such as Figure 4 As shown, a light-shielding Mylar sheet 401 is attached to the outer edge region of the non-display area 1022, for example, attached to the light-incident surface (i.e., the back surface) of the liquid crystal display panel 102, to block backlight leaking from the unshielded area of ​​the liquid crystal display panel 102. However, the inventors have found that this method also has some problems, such as: Figure 4As shown, for a rectangular liquid crystal display panel 102, light-shielding Mylar sheets 401 need to be manually attached to the top, bottom, left, and right sides. This increases the number of steps in the manufacturing process, resulting in lower production efficiency and higher costs. Furthermore, the consistency and accuracy of the manual attachment method are difficult to guarantee. Additionally, as... Figure 4 As shown, on the COF (Chip On Flex) 402 side of the liquid crystal display panel 102 (e.g.) Figure 4 The light-shielding Mylar sheet 401 attached to the lower side (as shown) can easily damage the display chip. In severe cases, it may even cause the 3D display device to malfunction and become unusable. In addition, during the assembly of the 3D display device, the light-shielding Mylar sheet 401 is easily worn and damaged by the outer frame, causing rework of the entire 3D display device and increasing costs, time and risks.

[0034] In view of this, embodiments of the present invention provide a 3D display device, such as... Figure 5 As shown, the device includes a liquid crystal display panel 501 and a spacer layer 502 and a grating layer (not shown in the figure) stacked sequentially on the light-emitting side of the liquid crystal display panel 501. A light-shielding ink layer 504 is provided on the edge region of the spacer layer 502 near the surface of the liquid crystal display panel 501.

[0035] The 3D display device provided in this embodiment can effectively improve edge light leakage and enhance the display effect by providing a light-shielding ink layer 504 on the edge region of the surface of the spacer layer 502 near the liquid crystal display panel 501. Furthermore, compared to... Figure 3 and Figure 4 Of the two methods shown, the design adopted in this embodiment, which sets a light-shielding ink layer 504 on the edge area of ​​the surface of the spacer layer 502 near the liquid crystal display panel 501, can effectively improve the edge light leakage of the 3D display device, and also has the advantages of not affecting the display area, lower cost, simple manufacturing process, ensuring product yield, and not affecting the bonding between the spacer layer 502 and the liquid crystal display panel 501.

[0036] In a specific example, the grating layer may include, for instance, an array of cylindrical lenses arranged in an array.

[0037] In one possible implementation, the spacer layer 502 is spacer glass.

[0038] In a specific example, the preparation method of the spacer glass is as follows: cutting a sheet of glass, including but not limited to ordinary float glass, to meet product size requirements, and then performing edge grinding and tempering (including physical tempering and / or chemical tempering) to obtain the spacer glass. A light-shielding ink layer 504 is formed on the edge region of one side surface of the spacer glass, for example, by screen printing or spraying. Taking screen printing as an example, the thickness of the light-shielding ink layer 504 can be set according to the transmittance requirement (e.g., 0.1%) of the light-shielding ink layer 504. Then, depending on the thickness of the light-shielding ink layer 504, black ink is screen printed onto the edge region of one side surface of the spacer glass once or multiple times to form the light-shielding ink layer 504. For example, the thickness of the light-shielding ink layer 504 can be designed to be 50 μm. Both screen printing and spraying are relatively mature and commonly used processes in glass processing. Therefore, forming a light-shielding ink layer 504 on the edge area of ​​the surface of the spacer glass can be achieved using existing glass processing equipment, with low preparation cost and guaranteed precision.

[0039] In one possible implementation, such as Figure 5 and Figure 6 As shown, the liquid crystal display panel 501 includes a display area 5011 and a non-display area 5012 surrounding the display area 5011. The non-display area 5012 is provided with a light-shielding layer 601, such as a black matrix layer BM.

[0040] In a specific example, for example Figure 6 As shown, the display area 5011 is rectangular, and the non-display area 5012 surrounding the display area 5011 is annular. The annular non-display area 5012 has four strip-shaped sections: top, bottom, left, and right. Similarly, the light-shielding layer 601 of the black matrix layer BM is also annular, and it also has four strip-shaped sections. The light-shielding layer 601 is designed not to completely cover the non-display area 5012. The outer edge of the annular light-shielding layer 601 and the edge of the liquid crystal display panel 501 (the edge of the liquid crystal display panel 501 is the outer edge of the annular non-display area 5012) are at a certain distance in the direction from the center of the liquid crystal display panel 501 to the edge, for example, 0.2mm-0.3mm. This creates an unshielded area at the outer edge of the non-display area 5012, which is also annular. It should be noted that... Figure 6 As shown, the display area 5011 is rectangular. Therefore, in this embodiment, the direction from the center of the liquid crystal display panel 501 to the edge can be understood relative to the upper edge of the liquid crystal display panel 501 as follows: Figure 6 The direction from bottom to top, for the lower edge of the LCD panel 501, can be understood as... Figure 6 The direction from top to bottom, for the left edge of the LCD panel 501, can be understood as... Figure 6 The right edge of the LCD panel 501, viewed from right to left, can be understood as... Figure 6 The direction from left to right. Furthermore, for example, a circular display area, the direction from the center of the liquid crystal display panel to the edge can be understood as the direction from the center of the liquid crystal display panel to that edge point for each edge point of the liquid crystal display panel.

[0041] In one possible implementation, such as Figure 5 and Figure 6 As shown, in the first direction, the length of the spacer layer 502 is greater than the length of the liquid crystal display panel 501, and the first direction is the direction from the center of the liquid crystal display panel 501 to the edge, for example... Figure 5 In the first direction, which is a horizontal direction from left to right, the length of the spacer layer 502 in the first direction is greater than the length of the liquid crystal display panel 501, i.e. Figure 5 and Figure 6 The size of the spacer layer 502 shown is larger than that of the liquid crystal display panel 501, and the edge of the spacer layer 502 is more prominent than the edge of the liquid crystal display panel 501.

[0042] In one possible implementation, the length of the light-shielding ink layer 504 in the first direction is greater than or equal to D. min ;D min =D1+D2; D1 is the distance between the edge of the spacer layer 502 and the edge of the liquid crystal display panel 501 in the first direction; D2 is the distance between the edge of the liquid crystal display panel 501 and the outer edge of the light-shielding layer 601 in the first direction.

[0043] like Figure 5 and Figure 6 As shown, the spacer layer 502 is rectangular, and the light-shielding ink layer 504 is annular. The length of the light-shielding ink layer 504 in the first direction is the width of the annular light-shielding ink layer 504.

[0044] Therefore, by limiting the minimum length of the light-shielding ink layer 504 in the first direction (i.e., the width of the annular light-shielding ink layer 504), it can be ensured that the light-shielding ink layer 504 can completely cover the unshielded area of ​​the outer edge region of the non-display area 5012 of the liquid crystal display panel 501, thus ensuring the effectiveness of improving edge light leakage of the 3D display device.

[0045] In one possible implementation, the length of the light-shielding ink layer 504 in the first direction is less than or equal to D. max ;D max=D1+D3; D1 is the distance between the edge of the spacer layer 502 and the edge of the liquid crystal display panel 501 in the first direction; D3 is the distance between the edge of the liquid crystal display panel 501 and the edge of the display area 5011 in the first direction.

[0046] Therefore, by limiting the maximum value of the length of the light-shielding ink layer 504 in the first direction (i.e. the width of the annular light-shielding ink layer 504), it can be ensured that the light-shielding ink layer 504 does not cover the display area 5011 of the liquid crystal display panel 501, and that the light-shielding ink layer 504 will not affect the display screen.

[0047] In one possible implementation, the 3D display device provided in this embodiment further includes an outer frame, which includes a front frame 5051 extending along a second direction and located on the side of the grating layer away from the spacer layer 502. In the second direction, the length of the front frame 5051 is less than the distance between the edge of the liquid crystal display panel 501 and the edge of the display area 5011. The second direction is the direction in which the edge of the liquid crystal display panel 501 points to the center.

[0048] It should be noted that the size of the grating layer can be equal to the size of the liquid crystal display panel 501, or smaller than the size of the liquid crystal display panel 501, but only covers at least the display area 5011. Figure 5 The grating layer, smaller than that of the liquid crystal display panel 501, is not shown in the diagram. Figure 5 The front frame 5051 shown appears to be located on the side of the spacer layer 502 away from the liquid crystal display panel 501.

[0049] When using a liquid crystal display panel 501, the 3D display device also includes a backlight module, which is disposed on the light-incident side of the liquid crystal display panel 501. The backlight module can be, for example, an edge-lit backlight module or a direct-lit backlight module. Taking an edge-lit backlight module as an example, it includes, for example, a backlight source, a reflective sheet, a light guide plate (LGP), and optical films. The backlight source includes, for example, multiple light-emitting elements and a circuit board that provides electrical signals to the light-emitting elements. Each of the multiple light-emitting elements may include a light-emitting diode (LED). For example, if the backlight module is an edge-lit backlight module, the light guide plate may include or be made of glass. The light guide plate may also include or be made of synthetic resin, which may include polymethyl methacrylate (PMMA) or polymethyl methacrylate. Light emitted from the backlight source is refracted by the light guide plate and then incident on the liquid crystal display panel 501 through the optical films.

[0050] The liquid crystal display panel 501 includes, for example, a color filter substrate, an array substrate disposed opposite to the color filter substrate, and a liquid crystal layer located between the color filter substrate and the array substrate. The array substrate and the color filter substrate are bonded together with an adhesive sealant, and the liquid crystal layer is formed within a closed area enclosed by the adhesive sealant.

[0051] The color filter substrate includes a first substrate and a black matrix layer and a color resist layer formed on the first substrate. The first substrate includes sub-pixel regions arranged in an array. The black matrix layer has multiple openings corresponding to the sub-pixel regions. The color resist layer includes multiple blue color resist layers, multiple red color resist layers and multiple green color resist layers respectively disposed in the multiple openings.

[0052] An array substrate, also known as an array substrate or a TFT substrate, includes a second substrate. Multiple scan lines (or gate lines) extending along a first direction (e.g., row direction) and multiple data lines extending along a second direction (e.g., column direction) are formed on the second substrate. The scan lines and data lines intersect to define sub-pixel regions arranged in an array. It is understood that the sub-pixel regions on the array substrate correspond one-to-one with the sub-pixel regions on the color filter substrate. This one-to-one correspondence can be understood as the orthographic projection of the sub-pixel region on the array substrate onto the second substrate coinciding with the orthographic projection of the sub-pixel region on the color filter substrate onto the second substrate. Each sub-pixel region of the array substrate is provided with a pixel electrode and a thin-film transistor (TFT). The gate of the TFT is connected to the scan line, the first electrode (e.g., source electrode) is connected to the data line, and the second electrode (e.g., drain electrode) is connected to the pixel electrode belonging to the same sub-pixel region. For example, the array substrate also includes a common electrode, a first insulating layer located between the data line and the common electrode, and a second insulating layer located between the common electrode and the pixel electrode. For example, the pixel electrode and the common electrode are indium tin oxide (ITO) electrodes or indium zinc oxide (IZO) electrodes, respectively.

[0053] The liquid crystal molecules in the liquid crystal layer twist under the action of the driving electric field formed between the pixel electrode and the common electrode, controlling the polarization direction of the incident light. In addition, the transmittance of the incident light is controlled by the cooperation of two polarizers respectively set on the light-incident side and the light-exit side of the liquid crystal display panel 501, and color display is achieved in combination with the color resist layer.

[0054] Continuing with the above example, for example Figure 5 As shown, the outer frame also includes, for example, a rear frame 5052 that encapsulates the backlight module, liquid crystal display 501, spacer layer 502 and grating layer from the back and sides, and the rear frame 5052 and the front frame 5051 form an integral outer frame.

[0055] In one possible implementation, the spacer layer 502 is bonded to the liquid crystal display panel 501 via a first optical adhesive layer. For example, the first optical adhesive layer is an optical adhesive such as acrylic or silicone.

[0056] In one possible implementation, the thickness of the first optical adhesive layer is greater than the thickness of the light-shielding ink layer 504. This ensures the flatness of the bonding between the spacer layer 502 and the liquid crystal display panel 501, especially when the light-shielding ink layer 504 is relatively thick.

[0057] In one possible implementation, the grating layer and the spacer layer 502 are bonded together by a second optical adhesive layer. For example, the second optical adhesive layer is an optical adhesive such as acrylic or silicone.

[0058] Continuing with the previous example, after preparing the spacer glass with the light-shielding ink layer 504, one side of the spacer glass with the light-shielding ink layer 504 can be bonded to the liquid crystal display panel 501 through a first optical adhesive layer, and the other side of the spacer glass can be bonded to the grating layer through a second optical adhesive layer to form a 3D display module including the liquid crystal display panel 501, the spacer glass and the grating layer. The 3D display module can then be assembled with the backlight module, the outer frame and electrical components to obtain the 3D display device (complete machine).

[0059] The display device provided in this embodiment can be any product or component with display function, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigator. This embodiment does not limit it in this regard.

[0060] Furthermore, although the above embodiments are described using a 3D display device with a liquid crystal display (LCD) panel as the display panel, which has a more severe edge light leakage phenomenon, it is understood that the design of providing a light-shielding ink layer in the edge area of ​​the spacer layer near the surface of the display panel used in the above embodiments can also be applied to 3D display devices with other types of display panels, including organic light-emitting diode (OLED) display panels.

[0061] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. All obvious variations or modifications derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. A 3D display device, characterized in that, It includes a display panel and a spacer layer and a grating layer stacked sequentially on the light-emitting side of the display panel. The edge area of ​​the spacer layer near the surface of the display panel is provided with a light-shielding ink layer. In a first direction, the length of the spacer layer is greater than the length of the display panel, and the first direction is the direction from the center of the display panel to the edge; The display panel includes a display area and a non-display area surrounding the display area. The non-display area is provided with a light-shielding layer, which does not completely cover the non-display area. The outer edge area of ​​the non-display area is an unshielded area. In the first direction, the length of the light-shielding ink layer is greater than or equal to D. min ;D min =D1+D2; D1 is the distance between the edge of the spacer layer and the edge of the display panel in the first direction; D2 is the distance between the edge of the display panel and the outer edge of the light-shielding layer in the first direction; The 3D display device further includes an outer frame, the outer frame including a front frame extending along a second direction and located on the side of the grating layer away from the spacer layer, in the second direction the length of the front frame is less than the distance between the edge of the display panel and the edge of the display area, the second direction being the direction in which the edge of the display panel points to the center; In the first direction, the length of the light-shielding ink layer is less than or equal to D. max ;D max = D1+D3; D1 is the distance between the edge of the spacer layer and the edge of the display panel in the first direction; D3 is the distance between the edge of the display panel and the edge of the display area in the first direction.

2. The 3D display device according to claim 1, characterized in that, The spacer layer is bonded to the display panel via a first optical adhesive layer.

3. The 3D display device according to claim 2, characterized in that, The thickness of the first optical adhesive layer is greater than the thickness of the light-shielding ink layer.

4. The 3D display device according to claim 1, characterized in that, The septum layer is septum glass.

5. The 3D display device according to claim 1, characterized in that, The display panel is a liquid crystal display panel.

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