CN105320347B - touch display device - Google Patents

Abstract

The present invention provides a touch display device, including a display panel and a touch panel. The display panel is used to display a display image, and the display image has a linear polarization state. The display panel includes an upper polarizer, wherein the upper polarizer has a penetration axis. The touch panel is configured on the display panel, and the touch panel includes a substrate, wherein the substrate has a fast axis, and the display image is converted from the linear polarization state to a circular polarization state after passing through the fast axis. In addition, the present invention also provides a touch display device with multiple substrates. The substrate with the fast axis replaces the substrate originally in the touch panel, and no additional substrate layer is added. Therefore, the touch display device of the present invention is thinner.

Description

touch display device

technical field

The present invention relates to a touch display device, and in particular to a touch display device capable of allowing users to view through a polarizing element.

Background technique

With the development of science and technology, electronic products have been widely used in daily life. In order to achieve more convenient portability, smaller size and more user-friendly operation, many electronic products have changed from traditional input devices such as keyboards or mice to touch input. For example, a mobile phone or a tablet computer among mobile electronic products is a touch display device in which a touch panel and a display panel are combined.

When driving or exercising, in order to reduce the impact of external light on the eyes, the user of the touch display device may wear polarized sunglasses to watch the display on the screen. However, since the polarization direction of the image light may be perpendicular to the polarization direction of the polarized sunglasses, the user sees a completely black image, causing inconvenience to the user. To be more specific, FIG. 1A is a schematic diagram of pairing sunglasses with a general touch display device. Please refer to FIG. 1A , the touch display device 100 includes a display panel 110 and a touch panel 130 . The display panel 110 is used to display images, and the display panel 110 has an upper polarizer 112 with a transmission axis (not shown). When the user wears polarized sunglasses G and touches the display device 100 at different viewing angles θ, since the displayed image of the touch display device 100 is in a linearly polarized state, the brightness seen by the user will vary with the polarization state. The viewing angle θ of the sunglasses G is different and there are obvious differences. FIG. 1B shows the light distribution result of the change of the angle between the touch display device and the polarized sunglasses G. Please refer to FIG. 1B, the angle between the transmission axis of the upper polarizer 112 and the polarized sunglasses G In the case of about 150 degrees or 330 degrees, the touch display device seen by the user has almost no brightness.

Traditionally, an additional layer of quarter-wave plate is used on the display panel to convert the linear polarization state of the displayed image into a circular polarization state, so as to prevent users from wearing polarized sunglasses to watch the touch display There is a problem of uneven brightness at different angles during installation. The following briefly introduces such existing touch display devices.

FIG. 2A is a schematic cross-sectional view of one of the conventional touch display devices. Please refer to FIG. 2A first, the touch display device 200a includes a backlight module 240a, a liquid crystal display panel 210a, a quarter wave plate 220a and a touch panel 230a arranged in sequence. The liquid crystal display panel 210a further includes a lower polarizer 216a, a liquid crystal layer 214a and an upper polarizer 212a arranged in sequence. The quarter-wave plate 220a is disposed between the upper polarizer 212a and the touch panel 230a.

FIG. 2B is a schematic cross-sectional view of another conventional touch display device. Please refer to FIG. 2B , the touch display device 200b includes an organic light emitting display panel 210b , a quarter-wave plate 220b and a cover plate 230b arranged in sequence. The organic light emitting display panel 210b further includes an organic light emitting display layer 214b (with an integrated/built-in (on-cell/in-cell) touch module), a lower quarter wave plate 216b and an upper polarizing plate arranged in sequence 212b.

Both of the above two touch display devices convert linearly polarized light into circularly polarized light through the quarter-wave plates 220a and 220b, so that the components of the light in each polarization direction are approximately the same, thereby improving user configuration. There is a problem of uneven brightness at different angles when viewing a touch display device with polarized sunglasses. However, the above-mentioned touch display devices all need to be equipped with an additional layer of quarter-wave plate, which makes it difficult to reduce the thickness of the touch display device, which is not in line with the current trend of thin, light and small electronic products.

Contents of the invention

The invention provides a touch display device, which can maintain a certain display quality and has a thinner thickness when a user watches through a polarizing element.

An overcurrent protection device of the present invention, a touch display device, includes a display panel and a touch panel. The display panel is used for displaying images, and the display image has a linear polarization state. The display panel includes an upper polarizer, wherein the upper polarizer has a transmission axis. The touch panel is disposed on the display panel, and the touch panel includes a substrate, wherein the substrate has a fast axis, and the displayed image is converted from the linear polarization state to a circular polarization state after passing through the fast axis.

In an embodiment of the present invention, the included angle between the fast axis and the penetration axis is between 5 degrees and 85 degrees.

In an embodiment of the present invention, the display panel is a liquid crystal display panel or an organic light emitting diode display panel.

In an embodiment of the present invention, the structure of the touch panel includes a single glass structure (One GlassSolution, OGS), a glass-film structure (Glass-film, GF), a glass-film structure (glass-film 2, GF2) or glass-film-film structure (Glass-film-film, GFF).

In one embodiment of the present invention, the material of the substrate includes polyethylene terephthalate (polyethylene terephthalate, PET), cyclo-olefin copolymer (cyclo-olefin polymer, COP) resin or cellulose triacetate (Tri- Acetyl Cellulose, TAC).

The present invention further provides a touch display device, which includes a display panel and a touch panel. The display panel is used for displaying images, and the display image has a linear polarization state. The display panel includes an upper polarizer, wherein the upper polarizer has a transmission axis. The touch panel is arranged on the display panel, and the touch panel includes a plurality of substrates, each of which has a fast axis. The above linear polarization state is converted into a circular polarization state.

In an embodiment of the present invention, the included angle between the fast axis of the assembly and the penetration axis is between 5 degrees and 85 degrees.

In an embodiment of the present invention, the above-mentioned display panel is a liquid crystal display panel or an OLED display panel.

In an embodiment of the present invention, the structure of the touch panel includes a glass-film-film (GFF) structure.

In one embodiment of the present invention, the material of the substrate includes polyethylene terephthalate (polyethylene terephthalate, PET), cyclo-olefin copolymer (cyclo-olefin polymer, COP) resin or cellulose triacetate (Tri- Acetyl Cellulose, TAC).

Based on the above, in the touch panel of the touch display device according to the embodiment of the present invention, at least one substrate is a substrate with a fast axis. After the equivalent fast axis of the assembly), the polarization direction of the displayed image can be changed from a linear polarization state to a circular polarization state, so as to prevent the user from wearing polarized sunglasses to watch the touch display device from brightness at different angles. uneven problem. Since the present invention replaces the original substrate in the touch panel with a substrate having a fast axis, and does not add an additional substrate, the touch display device of the present invention has a thinner thickness.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail with reference to the accompanying drawings.

Description of drawings

FIG. 1A is a schematic diagram of polarized sunglasses used in conjunction with a known touch display device;

FIG. 1B shows the light distribution result of the angle change between the known touch display device and polarized sunglasses;

2A to 2B are schematic cross-sectional views of different existing touch display devices;

3A, 4A, 5A and 6A are schematic cross-sectional views of various touch display devices according to different embodiments of the present invention;

FIG. 3B, FIG. 4B, FIG. 5B and FIG. 6B are exploded views of the touch display device shown in FIG. 3A, FIG. 4A, FIG. 5A and FIG. 6A, respectively;

FIG. 3C and FIG. 4C are schematic top views of the angles between the fast axis and the penetration axis of the touch display devices of FIG. 3A and FIG. 4A ;

FIG. 5C and FIG. 6C are schematic top views of the angle between the fast axis and the penetration axis of the assembly of the touch display device shown in FIG. 5A and FIG. 6A ;

FIG. 3D shows the light distribution result of the angle change between the touch display device of FIG. 3A and polarized sunglasses.

Detailed ways

FIG. 3A is a cross-sectional view of a touch display device according to an embodiment of the present invention. FIG. 3B is an exploded view of the touch display device shown in FIG. 3A . FIG. 3C is a schematic top view of the angle between the fast axis and the penetration axis of the touch display device shown in FIG. 3A .

Please refer to FIG. 3A to FIG. 3C at the same time. The touch display device 300 of this embodiment is suitable for users to watch through a polarizing element (not shown), wherein the polarizing element may be polarized sunglasses. The touch display device 300 of this embodiment includes a backlight module 340 , a display panel 310 and a touch panel 330 .

In this embodiment, the display panel 310 is a liquid crystal display panel. The display panel 310 includes an upper polarizer 312 , a liquid crystal layer 314 and a lower polarizer 316 . The liquid crystal layer 314 is disposed between the upper polarizer 312 and the lower polarizer 316 . The upper polarizer 312 has a transmission axis 312TA. The backlight module 340 is disposed under the lower polarizer 316 of the display panel 310 to provide light R for displaying images on the display panel 310 .

In this embodiment, the touch panel 330 is disposed on the display panel 310 , and the touch panel 330 includes a substrate 332 , a cover plate 334 and a plurality of sensing electrodes (not shown). The cover plate 334 has a surface S facing the display panel 310 . The substrate 332 is disposed on the surface S. As shown in FIG. The sensing electrodes are disposed between the substrate 332 and the cover 334 .

Generally speaking, the displayed image of the display panel 310 will be transmitted in the form of a linear polarization state with a specific polarization direction after passing through the upper polarizer 312. There is a problem of uneven brightness at different angles. In this embodiment, the touch panel 330 particularly selects the substrate 332 with the fast axis 332FA, and the angle between the fast axis 332FA of the substrate 332 and the transmission axis 312TA of the upper polarizer 312 is non-parallel and non-perpendicular, for example , there is an included angle α between the fast axis 332FA of the substrate 332 and the transmission axis 312TA of the upper polarizer 312 between 5° and 85° (in a preferred embodiment, the included angle α is 45 degree). In this way, after the display image with a linear polarization state passes through the fast axis 332FA of the substrate 332, the display image will be converted from a linear polarization state to a circular polarization state, so as to avoid the occurrence that the image viewed by the user at a specific angle appears full. black condition.

FIG. 3D shows the light distribution result of the angle change between the touch display device of FIG. 3A and polarized sunglasses. As shown in FIG. 3D , it can be seen from the measurement results that even if the user wears polarized sunglasses to watch the touch display device 300 of this embodiment, no matter what angle it is at, it can see the brightness close to that of the present embodiment. Or good viewing quality.

Compared with the existing touch display device, a quarter-wave plate is additionally arranged between the display panel and the touch panel, the touch display device 300 of this embodiment directly utilizes the original substrate in the touch panel 330 to The function of converting the linear polarization state into a circular polarization state is achieved, thereby effectively reducing the thickness of the touch display device.

In this embodiment, the type of the touch panel 330 may include a single glass structure (One Glass Solution, OGS), a glass-film layer structure (Glass-film, GF) or a glass-film layer 2 structure (glass-film2, GF2). It should be noted that although the touch panel 330 of this embodiment is an example of a touch panel with only one substrate 332, in other embodiments, the touch panel 330 may also have multiple substrates, such as glass-film Layer-film structure (Glass-film-film, GFF), etc. This type of touch panel 330 can be achieved as long as one of the substrates 332 has a fast axis 332FA, and the angle between the fast axis 332FA and the transmission axis 312TA of the upper polarizer 312 is between 5 degrees and 85 degrees. The above-mentioned effect of converting the linear polarization state into the circular polarization state can effectively avoid the situation that the picture seen by the user at a specific angle appears completely black. Of course, only a few types of the touch panel 330 are listed above, and the types of the touch panel 330 are not limited thereto.

In addition, in this embodiment, the material of the substrate 332 is, for example, polyethylene terephthalate (polyethyleneterephthalate, PET), cyclo-olefin copolymer (cyclo-olefin polymer, COP) resin or cellulose triacetate (Tri-Acetyl Cellulose, TAC), but the material of the substrate 332 is not limited thereto, as long as it is transparent and has a fast axis 332FA. The material of the cover plate 334 is, for example, transparent material such as glass or plastic. In addition, in other embodiments, the touch panel 330 may also omit the design of the cover plate 334, and a plurality of sensing electrodes (not shown) are arranged on the lower surface of the substrate 332, that is, the side of the substrate 332 facing the display panel 310. surface.

The above are only one or more examples of touch display devices, but the types of touch display devices are not limited thereto, and other touch display devices will be introduced below. It must be noted here that the following embodiments follow the description of the same technical content as the foregoing embodiments. For the description of the omitted part, reference may be made to the foregoing embodiments, and the following embodiments will not be repeated.

FIG. 4A is a schematic cross-sectional view of a touch display device according to another embodiment of the present invention. FIG. 4B is an exploded view of the touch display device shown in FIG. 4A . FIG. 4C is a schematic top view of the angle between the fast axis and the penetration axis of the touch display device shown in FIG. 4A .

Please refer to FIGS. 4A to 4C at the same time. The structure of the touch display device 400 of this embodiment is similar to that of the touch display device 300 of FIGS. 3A to 3B . The display panel 410 is an organic light emitting display panel. In detail, the touch display device 400 of this embodiment includes a display panel 410 and a touch panel 430 . The display panel 410 includes an upper polarizer 412 , a quarter wave plate 416 and an organic light emitting display layer 414 . The upper polarizer 412 has a transmission axis 412TA. The quarter wave plate 416 is disposed between the upper polarizer 412 and the organic light emitting display layer 414 . The organic light emitting display layer 414 enables the display panel 410 to display images.

In this embodiment, the touch panel 430 is disposed on the display panel 410 . Likewise, the touch panel 430 includes a substrate 432 , a cover 434 and a plurality of sensing electrodes (not shown). Substrate 432 has fast axis 432FA. The cover plate 434 has a surface S facing the display panel 410 . The sensing electrodes are disposed between the substrate 432 and the cover 434 . In this embodiment, an angle α between the fast axis 432FA of the substrate 432 of the touch panel 430 and the transmission axis 412TA of the upper polarizer 412 exists between 5 degrees and 85 degrees (for example, the angle α is angle is 45 degrees). Therefore, after the display image with a linear polarization state passes through the fast axis 432FA of the substrate 432, the display image will be converted from a linear polarization state to a circular polarization state, so as to avoid the situation that the image viewed by the user at a specific angle appears completely black. .

Compared with the aforementioned embodiments, in this embodiment, in addition to maintaining a certain display quality when the user wears polarized sunglasses to view the touch display device, and there is no need to install between the display panel and the touch panel. In addition to being equipped with a quarter-wave plate, the organic light-emitting display panel used in this embodiment does not need a backlight module, so it is thinner and lighter, has a wider viewing angle, and saves more power.

FIG. 5A is a schematic cross-sectional view of a touch display device according to an embodiment of the present invention. FIG. 5B is an exploded view of the touch display device shown in FIG. 5A . FIG. 5C is a schematic top view of the included angle between the fast axis and the penetration axis of the touch display device of FIG. 5A .

Please refer to FIGS. 5A to 5C at the same time. The structure of the touch display device 500 of this embodiment is similar to that of the touch display device 300 of FIGS. 3A to 3B . The main difference between the two is that the touch panel 530 of this embodiment includes There are a plurality of substrates 532 , and each substrate 532 of the touch panel 530 has a fast axis 532FA. More precisely, the aforementioned touch display device 300 has only one substrate 332 with a fast axis 332FA. In this embodiment, the touch panel 530 has two substrates 532 , and the two substrates 532 have respective fast axes 532FA. As shown in FIG. 5C, the two fast axes 532FA of the two substrates 532 can be equivalently formed into an assembly fast axis 532TFA, and an angle between the assembly fast axis 532TFA and the transmission axis 512TA of the upper polarizer 512 is between 5 The included angle α between 85 degrees and 85 degrees (for example, the included angle α is 45 degrees).

In this embodiment, the touch panel 530 selects multiple substrates with fast axes, and there is an angle between 5 degrees and 85 degrees between the fast axes 532TFA of the assembly and the transmission axis 512TA of the upper polarizer 512. The design of angle α. After the display image with the linear polarization state passes through the substrates 532 , the display image will be converted from the linear polarization state to the circular polarization state, so as to avoid the situation that the image viewed by the user at a specific angle appears completely black.

In this embodiment, the type of the touch panel 530 is, for example, a glass-film-film structure

(Glass-film-film, GFF), a plurality of first sensing electrodes (not shown) and a plurality of second sensing electrodes (not shown) of the touch panel 530 are respectively arranged on the two substrates 532 , However, the type of the touch panel 530 is not limited thereto.

FIG. 6A is a schematic cross-sectional view of a touch display device according to an embodiment of the present invention. FIG. 6B is an exploded view of the touch display device shown in FIG. 6A . FIG. 6C is a schematic top view of the included angle between the fast axis and the penetration axis of the touch display device of FIG. 6A .

Please refer to FIG. 6A to FIG. 6C at the same time. The structure of the touch display device 600 of this embodiment is similar to that of the touch display device 400 of FIG. 4A to FIG. Each substrate 632 of the touch panel 630 has a fast axis 632FA. In this embodiment, the touch panel 630 particularly selects two substrates 632 each having a fast axis 632FA. For the display image of the display panel 610, the fast axes 632FA of the substrates 632 are equivalent to the assembly fast axis 632TFA, and an angle exists between the assembly fast axis 632TFA and the transmission axis 612TA of the upper polarizer 612. The included angle α between 5 degrees and 85 degrees (for example, the angle of the included angle α is 45 degrees), after the display image with a linear polarization state passes through these substrates 632, the display image will be converted from a linear polarization state to a circular polarization state , so as to avoid the situation that the picture seen by the user at a specific angle is completely black.

To sum up, the touch display device in the embodiment of the present invention utilizes the fast axis of one substrate in the touch panel or the equivalent assembly fast axis of multiple fast axes of multiple substrates. After the axis or the fast axis of the assembly, the polarization direction of the displayed image can be changed from a linear polarization state to a circular polarization state, so as to avoid the problem of uneven brightness at different angles when the user wears polarized sunglasses to watch the touch display device. Since the present invention replaces the original substrate in the touch panel with a substrate having a fast axis, and does not add an additional substrate, the touch display device of the present invention has a thinner thickness.

Although the present invention has been disclosed above with the embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection shall prevail as defined in the claims.

Claims (10)

1. A touch display device, characterized in that, comprising: a display panel for displaying a display image, the display image has a linear polarization state, the display panel includes an upper polarizer, wherein the upper polarizer has a transmission axis; and The touch panel is configured on the display panel and includes a substrate, wherein the substrate has a fast axis, and the displayed image is converted from the linear polarization state to a circular polarization state after passing through the fast axis. 2 . The touch display device according to claim 1 , wherein an included angle between the fast axis and the penetration axis is between 5 degrees and 85 degrees. 3. The touch display device according to claim 1, wherein the display panel is a liquid crystal display panel or an organic light emitting diode display panel. 4. The touch display device according to claim 1, wherein the structure of the touch panel comprises a monolithic glass structure, a glass-film layer structure, a glass-film layer 2 structure or a glass-film layer- film structure. 5. The touch display device according to claim 1, wherein the material of the substrate comprises polyethylene terephthalate, cycloolefin copolymer resin or cellulose triacetate. 6. A touch display device, characterized in that it comprises: a display panel for displaying a display image, the display image has a linear polarization state, the display panel includes an upper polarizer, wherein the upper polarizer has a transmission axis; and The touch panel is configured on the display panel and includes a plurality of substrates, wherein each of the substrates has a fast axis, and the fast axes of the substrates are equivalent to an assembly fast axis, and the displayed image passes through the After the fast axis of the assembly, the linear polarization state is converted to a circular polarization state. 7 . The touch display device according to claim 6 , wherein an included angle between the fast axis and the fast axis of the assembly is between 5 degrees and 85 degrees. 8. The touch display device according to claim 6, wherein the display panel is a liquid crystal display panel or an organic light emitting diode display panel. 9. The touch display device according to claim 6, wherein the structure of the touch panel comprises a glass-film-film structure. 10 . The touch display device according to claim 6 , wherein the material of the substrate comprises polyethylene terephthalate, cycloolefin copolymer resin or cellulose triacetate. 11 .