CN111856809A

CN111856809A - Display module

Info

Publication number: CN111856809A
Application number: CN202010532277.4A
Authority: CN
Inventors: 卢双龙; 杨利利
Original assignee: AU Optronics Suzhou Corp Ltd; AU Optronics Corp
Current assignee: AU Optronics Suzhou Corp Ltd; AU Optronics Corp
Priority date: 2020-06-11
Filing date: 2020-06-11
Publication date: 2020-10-30
Anticipated expiration: 2040-06-11
Also published as: TWI743959B; TW202146991A; CN111856809B

Abstract

The invention discloses a display module which comprises a display panel, a backlight unit and a first shading layer. The backlight unit is located at one side of the display panel and comprises a back plate and a rubber frame. The back plate has an opening with a radius R. The rubber frame is provided with at least one groove. The reflectivity of the back plate is greater than that of the rubber frame. The shortest distance H is arranged between the circle center of the opening and the inner edge of the rubber frame, at least one part of the groove is positioned in the range of the length L extending from the line segment which passes through the circle center of the opening and is vertical to the inner edge of the rubber frame to two sides, and the length L is equal to H + √ 2R.

Description

Display module

Technical Field

The invention relates to a display module.

Background

With the development of display technology, a high screen ratio becomes a trend of mobile phone development, and the screen ratio is a ratio of a displayable area of a mobile phone screen to the whole front area of the mobile phone. In recent years, more and more displays have a front lens manufactured in a display area, so that the periphery of a screen can be a narrow frame. However, the backlight module needs an opening to place the lens, which causes a problem of light leakage around the opening.

Disclosure of Invention

The invention provides a display module which can effectively prevent light leakage.

The display module comprises a display panel, a backlight unit and a first shading layer. The backlight unit is located at one side of the display panel and comprises a back plate and a rubber frame. The back plate has an opening with a radius R. The rubber frame is provided with at least one groove. The reflectivity of the back plate is greater than that of the rubber frame. The shortest distance H is arranged between the circle center of the opening and the inner edge of the rubber frame, the groove positioned at one side of the inner edge meets the condition that at least one part of the groove is positioned in the range of extending lengths L from a line segment which passes through the circle center of the opening and is vertical to the inner edge of the rubber frame to two sides, and the length L is equal to

Based on the above, in the case that the display module of the present invention includes the display panel, the backlight unit and the first light shielding layer configured as above, the first light shielding layer is disposed on the sidewall of the display panel, so as to prevent the light of the backlight unit from reflecting through the sidewall of the back plate and then entering the display panel from the sidewall of the display panel, which results in leaving a light spot on the sidewall of the back plate facing the opening, thereby effectively preventing light leakage.

Drawings

Various aspects of the disclosure may be understood by reading the following detailed description in conjunction with the accompanying drawings. It is noted that the various features of the drawings are not to scale in accordance with standard practice in the art. In fact, the dimensions of the features described may be arbitrarily increased or reduced for clarity of discussion.

Fig. 1 is an exploded perspective view of a display module according to an embodiment of the invention.

Fig. 2 is a schematic top view of the display module of fig. 1.

Fig. 3 is a schematic cross-sectional view of fig. 2 along the sectional line I-I'.

Fig. 4 is an enlarged schematic view of the region R1 of fig. 2.

Fig. 5 is a schematic cross-sectional view of a display module according to an embodiment of the invention.

FIG. 6 is a schematic cross-sectional view of a display module according to another embodiment of the invention.

Fig. 7 is a schematic cross-sectional view of a display module according to another embodiment of the invention.

FIG. 8 is a cross-sectional view of a display module according to another embodiment of the invention.

Fig. 9 is a schematic cross-sectional view of a display module according to another embodiment of the invention.

Fig. 10 is a partial perspective view of fig. 9.

FIG. 11 is a cross-sectional view of a display module according to another embodiment of the invention.

Wherein, the reference numbers:

10,10a,10b,10c,10d display module

10e display module

20: lens

100 display panel

100A side wall

100B top surface

100C bottom surface

102 active array substrate

102A side wall

102B bottom surface

104 color filter substrate

104A side wall

104B top surface

106 polarizing plate

108 polarizer

110 black matrix

112 light-shading glue

114 display medium

116 first substrate

118 active element

120: second substrate

122 opposite electrode

124 frame glue

200 backlight unit

202 back plate

202B side wall

203, opening a hole

204 rubber frame

205 groove

206a,206b paths

207 line segment

208 optical stack

209 line segment

210 reflective sheet

212 light guide plate

214a,214b,214c,214d optical film

300 first light-shielding layer

302,304 light-shielding glue

400 the second light-shielding layer

402 first part

404 second part

500 third light-shielding layer

600 fourth light-shielding layer

C1 center of circle

d1 distance

H1, H2 minimum distance

I-I' cutting line

L1 length

L2 length

R is radius

R1 region

SS outer wall

Detailed Description

The present invention will now be described more fully hereinafter with reference to the accompanying drawings of the embodiments. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. The thickness of layers and regions in the drawings may be exaggerated for clarity. The same or similar reference numbers refer to the same or similar elements, and the following paragraphs will not be repeated. In addition, directional terms mentioned in the embodiments, for example: up, down, left, right, front or rear, etc., are referred to only in the direction of the attached drawings. Accordingly, the directional terminology is used for purposes of illustration and is in no way limiting.

Fig. 1 is an exploded perspective view of a display module 10 according to an embodiment of the invention. Fig. 2 is a schematic top view of the display module 10 of fig. 1. Fig. 3 is a schematic cross-sectional view of fig. 2 along the sectional line I-I'. Fig. 4 is an enlarged schematic view of the region R1 in fig. 2, and fig. 4 omits to show some components for convenience of description. Referring to fig. 1 to 4, the display module 10 includes a display panel 100, a backlight unit 200 and a first light shielding layer 300. The backlight unit 200 is disposed at one side of the display panel 100, and includes a back plate 202 and a rubber frame 204. The backplate 202 has an opening 203. The opening 203 may be used to position the lens 20 (see fig. 5). In the present embodiment, the first light-shielding layer 300 is disposed on the sidewall 100A of the display panel 100. For example, the first light-shielding layer 300 is located between the sidewall 100A of the display panel 100 and the back plate 202.

The reflectivity of the back plate 202 is greater than that of the rubber frame 204. For example, the material of the back plate 202Including metal, the material of the rubber frame 204 includes polymer. The rubber frame 204 has at least one groove 205, and in this embodiment, the position of the groove 205 is close to the position of the opening 203 of the back plate 202, so that the edge of the display module 10 is more beautiful. The opening 203 has a radius R, a shortest distance H1 and a shortest distance H2 are respectively provided between a center C1 of the opening 203 and an inner edge 204e of the plastic frame 204, the groove 205 at one side of the inner edge 204e satisfies that at least a portion of the groove 205 is located in a range of a length L1 extending from a line segment 207 passing through the center C1 of the opening 203 and perpendicular to the inner edge 204e of the plastic frame 204 to both sides, or the groove 205 at the inner edge 204e satisfies that at least a portion of the groove 205 is located in a range of a length L2 extending from a line segment 209 passing through a center C1 of the opening 203 and perpendicular to the inner edge 204e of the plastic frame 204 to both sides, wherein the length L1 is equal to the length L

And length L2 equal to

So that the light of the backlight unit 200 is reflected by the sidewall 202B of the back plate 202 and then enters the display panel 100 from the sidewall 100A of the display panel 100, resulting in a light spot on the outer wall SS of the opening 203, which causes a problem of light leakage. For example, the light travels along path 206a and path 206 b. In this case, since the first light-shielding layer 300 is disposed on the sidewall 100A of the display panel 100 in the present embodiment, the formation of the light spot can be avoided, and the light leakage can be effectively prevented. In the present embodiment, the first light-shielding layer 300 is, for example, a black single-sided adhesive or a black ink.

In the present embodiment, the opening 203 is a blind hole, which has an advantage of avoiding the risk cost of opening the display panel 100. However, the present invention is not limited thereto.

The display panel 100 may include an active array substrate 102 and a color filter substrate 104, and the color filter substrate 104 is disposed on the active array substrate 102. In this embodiment, the display module 10 further includes a polarizer 106 and a polarizer 108. The polarizer 106 is disposed between the active array substrate 102 and the backlight unit 200, and the polarizer 106 is disposed on the top surface 104B of the color filter substrate 104. In the present embodiment, the first light-shielding layer 300 is disposed on the sidewall 102A of the active array substrate 102 and the sidewall 104A of the color filter substrate 104, for example. In some embodiments, polarizer 106 and polarizer 108 may include Wire Grid Polarizers (WGPs) or polarizing films. The backlight unit 200 may include an optical stack 208 disposed on the back plate 202, wherein the optical stack 208 includes a reflective sheet 210, a light guide plate 212, an optical film 214a, an optical film 214b, an optical film 214c, and an optical film 214d sequentially disposed on the back plate 202, so that the backlight unit 200 may present a uniform surface light source. The

optical films

214a, 214b, 214c, 214d may be any optical film known to one of ordinary skill in the art for use in the backlight unit 200. For example, the

optical films

214a, 214b, 214c, 214d may be prism films, reflective films, diffusion films, optical brightness enhancement films, or a combination thereof, but the invention is not limited thereto.

The display panel 100 further includes a black matrix (black matrix) 110. The black matrix 110 is disposed on the active array substrate 102 and located between any two adjacent color filter patterns (not shown) of the color filter substrate 104. The display module 10 further includes a light-shielding adhesive 112, wherein the light-shielding adhesive 112 is located between the polarizer 106 and the back plate 202, and is used for preventing light reflection of the outer wall SS of the opening 203 and light leakage in the surface.

The display panel 100 further includes a display medium 114 (not shown in fig. 3), for example, referring to fig. 5, fig. 5 is a schematic cross-sectional view of the display module 10 according to an embodiment of the invention, for convenience of description, only the back plate 202 and the light-shielding glue 112 are shown in fig. 5, and the rest components of the backlight unit 200 and the black matrix 110 of the display panel 100 are omitted, and the display medium 114 is shown in this figure.

The display module 10 includes a lens 20, and the lens 20 is disposed in the opening 203. In the embodiment, the active array substrate 102 includes a first substrate 116 and a plurality of active devices 118 disposed on the first substrate 116. The display medium 114 is disposed on the first substrate 116. The color filter substrate 104 includes a second substrate 120 and a counter electrode 122 disposed on the second substrate 120. In the present embodiment, the first substrate 116 and the second substrate 120 are transparent substrates, for example, glass. In other embodiments, the first substrate 116 and the second substrate 120 are made of a material such as quartz, organic polymer, metal or other suitable materials. In the present embodiment, the display medium 114 is a liquid crystal material.

In this embodiment, the display module 10 further includes a light-shielding glue 302 and a light-shielding glue 304. The light-shielding adhesive 302 is disposed on the sidewall of the polarizer 108, and the light-shielding adhesive 304 is disposed on a portion of the outer wall SS of the opening 203 close to the light-shielding adhesive 304, so as to prevent light reflection and light leakage in the outer wall SS of the opening 203.

The display area AA of the display panel 100 surrounds the opening 203. For example, the display panel 100 further includes a sealant 124, and the front projection of the sealant 124 on the first substrate 116 surrounds the opening 203. In other words, the orthographic projection of the display medium 114 on the first substrate 116 is separated from the orthographic projection of the opening 203 on the first substrate 116. For example, the orthographic projection of the display medium 114 on the first substrate 116 and the orthographic projection of the outer wall SS of the opening 203 on the first substrate 116 are separated by a distance d1, and the opening 203 of the back plate 202 is surrounded by the display area AA, so that the display module 10 has a narrow frame around the periphery. Therefore, the display module 10 is suitable for narrow frame design under the conditions of beautiful edge and light leakage prevention, and the design flexibility of the display module 10 is improved.

Fig. 6 is a schematic cross-sectional view of a display module 10a according to another embodiment of the invention. At least one difference between the display module 10a of fig. 6 and the display module 10 of fig. 3 is that the display module 10a further includes a second light-shielding layer 400, and the second light-shielding layer 400 is disposed on the top surface 100B of the display panel 100. For example, the second light-shielding layer 400 can be disposed on the top surface 104B of the color filter substrate 104. In this embodiment, the second light-shielding layer 400 is, for example, a black single-sided adhesive or a black ink. The second light shielding layer 400 can prevent light from entering the display panel 100 from the top surface 100B of the display panel 100, which causes a problem of light leakage caused by light spots left on the outer wall SS of the opening 203.

Fig. 7 is a schematic cross-sectional view of a display module 10b according to another embodiment of the invention. At least one difference between the display module 10b of fig. 7 and the display module 10a of fig. 6 is that the second light-shielding layer 400 is disposed on the bottom surface 100C of the display panel 100. For example, the second light-shielding layer 400 may be disposed on the bottom surface 102B of the active array substrate 102. The second light-shielding layer 400 can prevent light from entering the display panel 100 from the bottom surface 100C of the display panel 100, which causes a problem of light leakage caused by light spots left on the outer wall SS of the opening 203.

Fig. 8 is a schematic cross-sectional view of a display module 10c according to another embodiment of the invention. At least one difference between the display module 10C of fig. 8 and the display module 10a of fig. 6 is that the second light-shielding layer 400 has a first portion 402 and a second portion 404, the first portion 402 is disposed on the top surface 100B of the display panel 100, and the second portion 404 is disposed on the bottom surface 100C of the display panel 100. For example, the first portion 402 can be disposed on the top surface 104B of the color filter substrate 104, and the second portion 404 can be disposed on the bottom surface 102B of the active array substrate 102, so as to avoid light leakage caused by light spots left on the outer wall SS of the opening 203, which is caused by light entering the display panel 100 from the top surface 100B and the bottom surface 100C of the display panel 100.

Fig. 9 is a schematic cross-sectional view of a display module 10d according to another embodiment of the invention. Fig. 10 is a partial perspective view of fig. 9. Referring to fig. 9 and 10 together, at least one difference between the display module 10d of fig. 9 and 10 and the display module 10 of fig. 3 is that the display module 10d further includes a third light-shielding layer 500. For convenience of description, only the third light-shielding layer 500, the back plate 202 and the rubber frame 204 are shown in fig. 10. The third light-shielding layer 500 is located on the sidewall 202B of the back plate 202, and the position of the sidewall 202B corresponds to the position of the groove 205 of the rubber frame 204. In other words, the sidewall 202B of the back plate 202 and the groove 205 of the rubber frame 204 are located on the same side of the opening 203. In this embodiment, the third light-shielding layer 500 is, for example, a black single-sided adhesive or a black ink. The third light-shielding layer 500 can prevent light from reflecting from the sidewall 202B of the back plate 202 and entering the display panel 100, thereby avoiding light spots on the outer wall SS of the opening 203, and solving the problem of light leakage.

Fig. 11 is a schematic cross-sectional view of a display module 10e according to another embodiment of the invention. At least one difference between the display module 10e of fig. 11 and the display module 10 of fig. 3 is that the display module 10e further includes a fourth light shielding layer 600, and the fourth light shielding layer 600 is disposed on the outer wall SS of the opening 203. When the light of the backlight unit 200 is reflected by the outer wall SS of the opening 203 and enters the display panel 100 from the sidewall 100A of the display panel 100, the fourth light shielding layer 600 can prevent the light from leaving a light spot on the outer wall SS of the opening 203, thereby effectively preventing light leakage. For example, the outer wall SS of the opening 203 may be entirely covered by the fourth light-shielding layer 600.

In summary, the opening of the display module of the invention has a radius R, and the reflectivity of the back plate is greater than the reflectivity of the rubber frame. The shortest distance H is arranged between the circle center of the opening and the inner edge of the rubber frame, at least one part of the groove is positioned in the range of the length L extending from the line segment which passes through the circle center of the opening and is vertical to the inner edge of the rubber frame to the two sides, and the length L is equal to the length L

Because the first light shielding layer is arranged on the side wall of the display panel, light of the backlight unit can be prevented from reflecting through the side wall of the back plate and then enters the display panel from the side wall of the display panel, so that light spots are left on the side wall of the back plate facing the opening, and light leakage is effectively prevented.

The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A display module, comprising:

a display panel;

a backlight unit disposed at one side of the display panel and comprising:

a backing plate having an opening, wherein the opening has a radius R; and

A rubber frame with at least one groove, wherein the reflectivity of the back plate is greater than that of the rubber frame, the shortest distance H is arranged between the center of the opening and an inner edge of the rubber frame, at least one part of the groove is positioned in the range of extending length L from a line segment which passes through the center of the opening and is vertical to the inner edge of the rubber frame to two sides, and the length L is equal to that of the rubber frame

And

a first light shielding layer disposed on a sidewall of the display panel.

2. The display module of claim 1, further comprising a second light-shielding layer disposed on the top surface or the bottom surface of the display panel.

3. The display module as claimed in claim 1, further comprising a second light shielding layer having a first portion and a second portion, wherein the first portion is disposed on the top surface of the display panel and the second portion is disposed on the bottom surface of the display panel.

4. The display module according to claim 1, further comprising a third light-shielding layer, wherein the third light-shielding layer is located at a position of the back plate corresponding to the groove of the bezel.

5. The display module of claim 1, wherein the display panel comprises a first substrate and a display medium disposed on the first substrate, and an orthographic projection of the display medium on the first substrate is separated from an orthographic projection of the opening on the first substrate.

6. The display module of claim 1, further comprising a fourth light-shielding layer disposed on an outer wall of the opening.

7. The display module according to claim 6, wherein an outer wall of the opening is entirely covered with the fourth light shielding layer.

8. The display module according to claim 1, wherein the sidewall of the display panel is entirely covered by the first light-shielding layer.

9. The display module of claim 1, wherein the material of the backplane comprises a metal.

10. The display module of claim 1, wherein the first light-shielding layer is disposed between the sidewall of the display panel and the backplane.