CN105185260A - Touch display device - Google Patents

Abstract

An embodiment of the present invention provides a touch display device, which relates to the technical field of touch display, and can solve the problem of making the touch panel and the front case The adhesive force between them is reduced, which leads to the problem that the touch display device is difficult to realize the narrow frame design. The touch display device includes a front shell, a display panel and a touch panel. The front shell is provided with a first groove and a second groove; the display panel is located in the first groove, and the lower surface is located on the first supporting surface of the first groove, and the upper surface is bonded to the touch panel; The panel is located in the second groove, and the lower surface is glued to the second support surface of the second groove; the second support surface is an inclined surface inclined to the inside of the front shell.

Description

A touch display device

technical field

The present invention relates to the technical field of touch display, in particular to a touch display device.

Background technique

With the rapid development of display technology, touch display devices make people's lives more convenient. The touch display device can be formed by attaching a touch panel (TouchPanel, TP) to the surface of the display panel. Wherein, the above display panel may be an LCD (Liquid Crystal Display, liquid crystal display) panel or an AMOLED (Active Matrix Driving OLED, active matrix driving organic light emitting diode) display panel. Since the AMOLED display panel has the characteristic of self-illumination, no backlight module is required, so the thickness is thin, which is more conducive to the ultra-thin design of the display device.

Based on this, when the touch display device adopts an AMOLED display panel, as shown in FIG. 1 a , the touch panel 100 can be bonded to the surface of the AMOLED display panel 200 through a layer of OCA300 (Optically Clear Adhesive, Optical Clear Adhesive). However, during the bonding process, since the AMOLED display panel has no glue frame, OCA300 will flow because there is no barrier, thus overflowing the preset bonding area, forming a residue of OCA300 with a thickness slightly thinner than the preset bonding area Section 301. And the residual portion 301 overlaps with the bonding surface A (overlapping area with width B). In this way, when liquid glue is placed on the bonding surface A to bond the touch panel 100 and the front case 400, the remaining portion 301 will be located between the bonding surface A and the remaining portion 301 (that is, the overlapping The thickness of the glue in the overlapping area) is too small, so the cohesive force of the glue in the overlapping area is very small and does not play an effective bonding effect, thereby reducing the cohesive force between the touch panel 100 and the front case 400 .

In order to solve the above problems, as shown in FIG. 1b , in the prior art, it is not only necessary to ensure that there is a gap of width L1 between the front case 400 and the AMOLED display panel 200, so as to avoid the processing error of the front case 400 and the attachment of the touch panel 100. combined error. On this basis, it is also necessary to increase the width of the gap to avoid the width L1' of the residual portion 301, so as to avoid reducing the bonding force between the front case and the touch panel. However, in this way, the width of the gap between the front case 400 and the AMOLED display panel 200 will be increased to L1+L1', thereby increasing the frame size of the touch display device, which is not conducive to the design requirement of a narrow frame of the display device.

Contents of the invention

Embodiments of the present invention provide a touch display device, which can solve the problem of reducing the adhesive force between the touch panel and the front case in order to avoid the existence of residual optical transparent glue when the touch display device is prepared by using an AMOLED display panel. , resulting in the problem that the touch display device is difficult to realize a narrow frame design.

In order to achieve the above object, embodiments of the present invention adopt the following technical solutions:

A touch display device, comprising a front case, a display panel, and a touch panel; the front case is provided with a first groove and a second groove, and the first groove and the second groove form a stepped groove; the The first groove includes a first supporting surface, and a first limiting surface located around the first supporting surface; the display panel is located in the first groove, and the lower surface is located on the first supporting surface, The upper surface is bonded to the touch panel; the second groove includes a second supporting surface and a second limiting surface located around the second supporting surface; the touch panel is located in the second concave In the groove, and the lower surface is glued to the second supporting surface; wherein, the second supporting surface is an inclined surface inclined toward the inside of the front shell.

In this way, since the second supporting surface is an inclined surface inclined toward the inside of the front shell, the distance from the touch panel to the inclined surface gradually increases along the inclined direction of the inclined surface. In the bonding method of liquid glue, after the above-mentioned liquid glue is coated with the second support surface, under the action of the glue's own gravity and the tooling pressure when the touch panel is bonded, the glue will make the glue move along the inclined second support surface to the front shell The inside flows so that the glue spreads over the entire second support surface. In this way, even in order to avoid the processing error of the front case and the bonding error of the touch panel, it is necessary to provide a gap between the side surface of the display panel and the first limiting surface, resulting in the formation of the remaining portion of the optically transparent adhesive on the second support. surface, but because the glue covers the entire second support surface, the inclined second support surface will increase the thickness of the liquid glue between it and the residual part, thus increasing the adhesion of the touch panel to the second support The adhesion of the glue on the surface. In addition, since the bonding force between the touch panel and the second supporting surface is strengthened, the entire periphery of the touch panel is attached to the second supporting surface, thus avoiding the partial position caused by weak bonding force. The touch panel is not attached to the second supporting surface, and warpage occurs.

In summary, in the touch display device provided by the present invention, since the inclined second support surface increases the thickness of the liquid glue between it and the residual portion of the optically transparent adhesive, the impact of the residual portion of the optically transparent adhesive on the touch panel is reduced. The influence of the bond force with the second support. Therefore, the width of the gap between the side surface of the display panel and the first limiting surface does not need to be widened in order to avoid the residual portion of the optically transparent glue. Therefore, it can be solved that when the AMOLED display panel is used to prepare the touch display device, in order to avoid the existence of the residual part of the optical transparent adhesive, the adhesive force between the touch panel and the front shell is reduced, which makes it difficult to realize a narrow touch display device. The problem of the frame design, in addition, by increasing the bonding force between the touch panel and the second supporting surface, the warping phenomenon caused by the weak bonding force at some positions can be avoided.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Figure 1a is a schematic structural diagram of a touch display device provided in the prior art;

FIG. 1b is a schematic structural diagram of another touch display device provided by the prior art;

FIG. 2 is a schematic structural diagram of a touch display device provided by an embodiment of the present invention;

Fig. 3 is a schematic structural view of the front shell in Fig. 2;

FIG. 4 is a schematic structural view of a touch display device with an overflow glue tank added in FIG. 2;

FIG. 5 is a structural schematic diagram of the support pads in FIG. 3 being evenly distributed on both sides of the touch display device;

FIG. 6 is an enlarged view of point C in FIG. 5 .

Reference signs:

100-touch panel; 200-display panel; 300-OCA; 301-remnant part 301 of OCA; 400-front shell; 410-first groove; 411-first edge; 4101-first supporting surface; 4102- 420-the second groove; 421-the second edge; 4201-the second support surface; 4202-the second limit surface; 500-overflow groove; 501-support pad; A-adhesive surface ; B-the width of the residual part and the overlapping area of the bonding surface; L1-the width of the first gap; L1'-the width of the residual part; L2-the width of the second support surface; L3-the width of the second gap; The distance from the control panel to the first edge; H2-the distance from the touch panel to the second edge; H3-the depth of the overflow glue groove.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

An embodiment of the present invention provides a touch display device, as shown in FIG. 2 , including a front case 400 , a display panel 200 and a touch panel 100 . It should be noted that, the display panel 200 in the embodiment of the present invention is described by taking a display panel without a plastic frame, such as an AMOLED display panel, as an example.

Specifically, as shown in FIG. 3 , the front case 400 is provided with a first groove 410 and a second groove 420 , and the first groove 410 and the second groove 420 form a stepped groove.

Wherein, the first groove 410 includes a first supporting surface 4101 and a first limiting surface 4102 located around the first supporting surface 4101 . The display panel 200 is located in the first groove 410 as shown in FIG. 2 , and the lower surface of the display panel 200 is located on the first supporting surface 4101 , and the upper surface is bonded to the touch panel 100 . It should be noted that, the lower surface of the display panel 200 is in contact with the first supporting surface 4101 , and the upper surface of the display panel 200 can be bonded to the touch panel 100 through an optically clear adhesive 300 (hereinafter referred to as OCA300).

In addition, the second groove 420 includes a second supporting surface 4201 and a second limiting surface 4202 located around the second supporting surface 4201 . As shown in FIG. 2 , the touch panel 100 is located in the second groove, and the lower surface of the touch panel 100 is adhered to the second supporting surface 4201 .

It should be noted that, in order to improve the stability of each component in the touch display device after assembly. The touch panel 100 not only needs to be bonded to the display panel 200 but also needs to be bonded to the front case 400 . Therefore, the size of the touch panel 100 is generally larger than the size of the display panel 200, most of the lower surface of the touch panel 100 is bonded to the display panel 200 through the OCA300, and the lower surface of the touch panel 100 is more than the part of the display panel 200. , that is, the periphery of the lower surface of the touch panel 100 is adhered to the second supporting surface 4201 . Specifically, the periphery of the lower surface of the touch panel 100 can be adhered to the second support surface 4201 by dotting liquid glue.

On this basis, the above-mentioned second supporting surface 4201 is an inclined surface inclined to the inside of the front shell 400 .

Specifically as shown in FIG. 3 , the intersection of the second supporting surface 4201 and the first limiting surface 4102 is the first edge 411 . The intersection of the second supporting surface 4201 and the second limiting surface 4202 is the second edge 421 . As shown in FIG. 2 , the distance H1 from the touch panel 100 to the first edge 411 is greater than the distance H2 from the touch panel 100 to the second edge 420 . In this case, the distance from the touch panel 100 to the inclined surface (ie, the second support surface 4201 ) gradually increases along the inclined direction of the inclined surface. Wherein the inside of the front case 400 may be facing the direction of the first supporting surface 4101 .

A touch display device provided by an embodiment of the present invention includes a front case, a display panel and a touch panel. The front case is provided with a concave first groove and a concave second groove. The first groove includes a first supporting surface and a first limiting surface located around the first supporting surface, the display panel is located in the first groove, the lower surface is located on the first supporting surface, and the upper surface is bonded to the touch panel combine. The second groove includes a second support surface and a second limiting surface located around the second support surface, the touch panel is located in the second groove, and the periphery of the lower surface is bonded to the second support surface; wherein, the The second support surface is an inclined surface inclined toward the inside of the front shell, the intersection of the second support surface and the first limiting surface is the first edge, and the intersection of the second supporting surface and the second limiting surface is the second edge. Edges, the distance from the touch panel to the first edge is greater than the distance from the touch panel to the second edge.

In this way, since the second supporting surface is an inclined surface inclined toward the inside of the front shell, the distance from the touch panel to the inclined surface gradually increases along the inclined direction of the inclined surface. In the bonding method of liquid glue, after the above-mentioned liquid glue is coated with the second support surface, under the action of the glue's own gravity and the tooling pressure when the touch panel is bonded, the glue will make the glue move along the inclined second support surface to the front shell The inside flows so that the glue spreads over the entire second support surface. In this way, even if a gap is provided between the side surface of the display panel and the first limiting surface in order to avoid the processing error of the front case and the lamination error of the touch panel, the remaining portion of the optically transparent adhesive is formed on the second supporting surface. However, since the glue can cover the entire second support surface, the inclined second support surface will increase the thickness of the liquid glue between it and the residual part, thus increasing the adhesion of the touch panel to the second support surface The adhesive force of the glue on it. In addition, since the bonding force between the touch panel and the second supporting surface is strengthened, the entire periphery of the touch panel is attached to the second supporting surface, thus avoiding the partial position caused by weak bonding force. The touch panel is not attached to the second supporting surface, and warpage occurs.

In summary, in the touch display device provided by the present invention, since the inclined second support surface increases the thickness of the liquid glue between it and the residual portion of the optically transparent adhesive, the impact of the residual portion of the optically transparent adhesive on the touch panel is reduced. The influence of the bond force with the second support. Therefore, the width of the gap between the side surface of the display panel and the first limiting surface does not need to be widened in order to avoid the residual portion of the optically transparent glue. Therefore, it can be solved that when the AMOLED display panel is used to prepare the touch display device, in order to avoid the existence of the residual part of the optical transparent adhesive, the adhesive force between the touch panel and the front shell is reduced, which makes it difficult to realize a narrow touch display device. The problem of the frame design, in addition, by increasing the bonding force between the touch panel and the second supporting surface, the warping phenomenon caused by the weak bonding force at some positions can be avoided.

The specific structure of the front case 400 will be described in detail below.

Preferably, the distance H1 from the touch panel 100 to the first edge 411 as shown in FIG. 2 may be 0.24 mm˜0.26 mm. When the distance H1 is less than 0.24 mm, the thickness of the glue between the inclined second support surface 4201 and the residual portion 301 does not increase significantly, so the bonding force between the second support surface 4201 and the touch panel 100 is not obvious. improvement. When the above-mentioned distance H1 is greater than 0.26 mm, although the bonding force between the second supporting surface 4201 and the touch panel 100 can be effectively improved, the amount of glue injected will increase, resulting in waste of glue.

Preferably, the above-mentioned distance H1 may be 0.25mm. Since the thickness of the OCA300 coated on the surface of the display panel 200 is generally 0.15mm, and there is no barrier to prevent the OCA300 from flowing to the part other than the upper surface of the display panel 200 (that is, the bonding between the display panel 200 and the touch panel 100 region) will form a residual portion 301 whose thickness can reach 0.1mm. In this case, when the above-mentioned distance H1 can be 0.25 mm, it can be ensured that even if the residual portion 301 overlaps with the second supporting surface 4201, the thickness of the glue formed on the second supporting surface 4201 can be substantially uniform to reach 0.15mm.

In addition, the distance H2 from the touch panel 100 to the second edge 421 is 0.14 mm˜0.16 mm. Preferably, the above-mentioned distance H2 may be 0.15mm. Therefore, during the production and assembly process, the thickness of the glue coated on the second support surface 4201 is 0.15mm, which can ensure sufficient adhesion between the touch panel 100 and the second support surface 4201 without causing glue waste.

Further, in order to avoid processing errors of the front case 400 and lamination errors of the touch panel 100 , a first gap is provided between the side of the display panel 200 and the first limiting surface 4102 . The first gap is arranged around the display panel 200 . The width L1 of the first gap may be 0.25 mm˜0.35 mm. When the width L1 of the first gap is less than 0.25 mm, the processing accuracy of the front case 400 and the touch panel 100 is required to be high, resulting in an increase in manufacturing cost. When the width L1 of the first gap is greater than 0.35. Although the processing error of the front case 400 and the lamination error of the touch panel 100 can be avoided effectively, the frame size of the display device will be increased, which is not conducive to the design requirement of a narrow frame.

In addition, in order to avoid liquid glue remaining on the bottom of the display panel 200 during the process of dispensing the liquid glue on the second support surface 4201 , thereby affecting the display panel. As shown in FIG. 4 , on the first support surface 4101 , corresponding to the first gap, a glue overflow groove 500 may be provided.

Wherein, the width of the overflow glue groove 500 can be the same as the width L1 of the first gap, so that the escaped glue can be prevented from flowing into the display panel 200 to the greatest extent without affecting the support performance of the first support surface 4101 to the display panel 200 lower surface.

Preferably, the width L1 of the first gap may be 0.3 mm. Therefore, the width of the glue overflow groove 500 is 0.3 mm.

In addition, the depth H3 of the glue overflow groove 500 may be 0.25 mm˜0.35 mm. When the depth H3 of the overflowing glue groove 500 is less than 0.25 mm, the glue overflowing groove 500 will be easily filled up by the escaping glue when the amount of glue injected is too much. However, when the depth H3 of the glue overflow groove 500 is greater than 0.35 mm, the strength of the front case 400 will be affected.

Further, when the touch panel 100 is placed on the second supporting surface 4201 coated with glue, since the glue is easy to flow during extrusion, part of the glue is extruded out of the second supporting surface 4201 . In this case, the thickness of the cured glue between the second supporting surface 4201 and the touch panel 100 will be smaller than the predetermined thickness, so that the predetermined adhesive force cannot be achieved. In addition, since the glue is not uniformly squeezed around the touch panel 100 , the thickness of the cured glue is also uneven, resulting in warping of the bonded touch panel 100 .

Therefore, as shown in FIG. 3 , at least one support pad 501 is provided on the second support surface 4201 , and the lower surface of the support pad 501 is in contact with the second support surface 4201 . Moreover, the upper surfaces of all the support pads 501 are located at the same level, and the upper surfaces of the support pads 501 are in contact with the lower surface of the touch panel 100 . In this way, on the one hand, during the process of installing the touch panel 100, the support pad 501 can play a role in supporting the touch panel 100, avoiding direct contact between the touch panel 100 and the glue on the second support surface 4201, while Squeeze the glue. Therefore, it is ensured that the adhesive force between the touch panel 100 and the second supporting surface 4201 is not affected. On the other hand, the upper surfaces of all the support pads 501 are located at the same level, so that the touch panel 100 can be prevented from warping.

Wherein, for the convenience of processing, the support pad 501 and the front shell 400 may be integrally formed by one-time pressing of a mold. Moreover, in order to make all the support pads 501 uniformly support the touch panel 100, as shown in FIG. A partially enlarged view of the support pad 501 on the upper front case 400 of the mobile phone is shown in FIG. 6 .

In addition, in order to make the second supporting surface 4102 able to reduce the frame size of the display device as much as possible on the basis of ensuring the supporting strength and providing a sufficient bonding surface, the width L2 of the second supporting surface 4102 may be 0.65mm-0.75mm . The preferred width L2 of the second supporting surface 4102 is 0.7mm. In this case, the width of the supporting pad 501 may be less than or equal to the width L2 of the second supporting surface 4102 . In this way, interference with the display panel 200 or the OCA 300 due to the too long width of the support pad 501 is avoided.

Further, in order to facilitate the installation of the touch panel 100, as shown in FIG. Panel 100 a week. The width L3 of the second gap is 0.04mm˜0.06mm. When the width L3 of the second gap is less than 0.04 mm, the requirement for processing accuracy is higher, thereby increasing the processing difficulty and production cost. When the width L3 of the second gap is greater than 0.06 mm, the frame length of the display device is increased due to the large width of the second gap, which is not conducive to the design requirement of a narrow frame. Wherein, the preferred width L3 of the above-mentioned second gap may be 0.05 mm, so that the front frame that meets the design requirements of the narrow frame can be prepared with proper processing accuracy.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (10)

1. a touch control display apparatus, comprises fore shell, display panel and contact panel; Described fore shell is provided with the first groove and the second groove, and described first groove and described second groove form step trough;

Described first groove comprises the first supporting surface, and is positioned at the first confined planes of described first supporting surface surrounding; Described display panel is arranged in described first groove, and lower surface is positioned on the first supporting surface, upper surface and described contact panel bonding;

Described second groove comprises the second supporting surface and is positioned at the second confined planes of described second supporting surface surrounding; Described contact panel is arranged in described second groove, and lower surface and described second supporting surface bonding;

It is characterized in that, described second supporting surface is the dip plane to described fore shell inner inclination.

2. touch control display apparatus according to claim 1, is characterized in that, the intersection of described second supporting surface and described first confined planes is the first edge, and the intersection of described second supporting surface and described second confined planes is the second edge; Described contact panel is 0.24mm ~ 0.26mm to the distance at described first edge; Described contact panel is 0.14mm ~ 0.16mm to the distance at described second edge.

3. touch control display apparatus according to claim 1, is characterized in that, is provided with the first gap between the side of described display panel and described first confined planes; On described first supporting surface, corresponding described first gap location, arranges excessive glue groove.

4. touch control display apparatus according to claim 3, is characterized in that, the width of described excessive glue groove is identical with the width in described first gap.

5. touch control display apparatus according to claim 1, is characterized in that, described second supporting surface is provided with at least one supporting pad, and the lower surface of described supporting pad contacts with described second supporting surface; The upper surface of all described supporting pads is positioned at same level, and contacts with the lower surface of described contact panel.

6. touch control display apparatus according to claim 5, is characterized in that, described supporting pad and described fore shell are structure as a whole.

7. touch control display apparatus according to claim 1, is characterized in that, is provided with the first gap between the side of described display panel and described first confined planes, and the width in described first gap is 0.25mm ~ 0.35mm.

8. touch control display apparatus according to claim 1, is characterized in that, the width of described second supporting surface is 0.65mm ~ 0.75mm.

9. touch control display apparatus according to claim 1, is characterized in that, is provided with the second gap between the side of described contact panel and described second confined planes, and the width in described second gap is 0.04mm ~ 0.06mm.

10. touch control display apparatus according to claim 3, is characterized in that, the degree of depth of described excessive glue groove is 0.25mm ~ 0.35mm.