TW201539056A - Touch display panel - Google Patents

Abstract

A touch display panel includes a display device, a touch sensing element, a polarizer, and an optical film. The touch sensing element is disposed on the display device. The polarizer is disposed on the display device and located between the display device and the optical film. The polarizer has an absorption axis, and the optical film has an optical axis, wherein the optical axis is not perpendicular to the absorption axis.

Description

Touch display panel

The present invention relates to a panel, and more particularly to a touch display panel.

With the rapid development of various applications such as information technology, wireless mobile communication and information appliances, many electronic products integrate touch panels into display devices in order to meet the user's demands for portability, compactness, and user-friendly operation. Omit the space required to set the keyboard or manipulate the buttons.

In general, in addition to the touch panel and the display device, the touch display panel is provided with an explosion-proof film to avoid damage to the touch panel due to the impact of external force. The explosion-proof membrane is usually a polyethylene terephthalate (PET) substrate which is formed by stretching a mother roll and then cutting it. However, stretching the film changes the axial axis of the parent roll and causes the parent roll to produce a double optical axis. For example, after stretching the film, the axial axis of the single-piece parent roll may be -30 to 30 degrees from the vertical film forming direction. Therefore, the explosion-proof films obtained after the cutting of the parent roll also have different optical axis axes.

The explosion-proof membrane, display device and touch are not considered in the axial direction of the optical axis of the explosion-proof membrane. With the random combination of the control panel, the polarization state of the beam emitted by the touch display panel cannot be controlled. That is to say, the light beam emitted by the touch display panel may be linearly polarized light, circularly polarized light or elliptically polarized light. Especially in the case where the emitted light beam is linearly polarized light or elliptically polarized light, when the user wears the sunglasses (polarizing element) using the touch display panel, the brightness of the screen is liable to be greatly reduced or even invisible due to the change of the viewing angle. The situation happened. Therefore, how to improve the invisibility situation and reduce the angle dependence during viewing when the user wears the sunglasses will be one of the focuses of the development of the touch display panel.

The invention provides a touch display panel, which can improve the invisibility condition and reduce the angle dependence during viewing when the user wears the sunglasses.

A touch display panel of the present invention includes a display device, a touch sensing component, a polarizer, and an optical film. The touch sensing component is located on the display device. The polarizer is disposed on the display device and located between the display device and the optical film. The polarizer has an absorption axis, and the optical film has an optical axis in which the optical axis is not perpendicular to the absorption axis.

A touch display panel of the present invention includes a display device, a touch sensing component, a polarizer, and an optical film. The touch sensing component is located on the display device. The polarizer is disposed on the display device and located between the display device and the optical film. The polarizer has an absorption axis in which a light beam from the display device is converted from the first polarized light to the second polarized light while passing through the polarizer and the optical film. The polarization state of the second polarized light is different from the polarization state of the first polarized light, and the polarization direction of the first polarized light is perpendicular to the absorption axis.

Based on the above, the touch display panel of the present invention transmits the polarization state of the polarized light after passing through the polarizer, so that the polarization state of the light beam emitted from the touch display panel is not parallel to the absorption axis of the sunglasses, so as to be worn by the user. In the case of sunglasses, the situation of invisibility is improved and the angle dependence at the time of viewing is lowered.

The above described features and advantages of the invention will be apparent from the following description.

100, 200, 300, 400, 500, 600‧‧‧ touch display panels

A1, A2‧‧‧ absorption axis

CG‧‧‧ cover

C1, C2, C3, C4, C5, C6‧‧‧ curves

D1‧‧‧ reference vector

DM‧‧‧ display media layer

DP‧‧‧ display device

GL‧‧‧Sunglasses

L, L’‧‧‧ beams

L1‧‧‧ long side

L2‧‧‧ Short side

O1‧‧‧ optical axis

OF‧‧‧Optical film

PZ‧‧‧ polarizer

SUB1‧‧‧ first substrate

SUB2‧‧‧second substrate

SUB3‧‧‧ third substrate

TS‧‧‧ touch sensing components

TS1‧‧‧ first electrode

TS2‧‧‧ second electrode

θ ₁ , θ ₂ ‧‧‧ angle

1 is a cross-sectional view of a touch display panel in accordance with a first embodiment of the present invention.

2A and 2B are schematic views of the optical film and the polarizer of Fig. 1.

Figure 3 is a graph showing the relationship between the angle of the optical film and the reference vector and the transmittance.

4 to 8 are schematic cross-sectional views of a touch display panel according to second to sixth embodiments of the present invention.

1 is a cross-sectional view of a touch display panel in accordance with a first embodiment of the present invention. Referring to FIG. 1 , the touch display panel 100 of the present embodiment includes a display device DP, a touch sensing component TS, a polarizer PZ, and an optical film OF. The touch sensing element TS is disposed on the display device DP. The polarizer PZ is disposed on the display device DP and located between the display device DP and the optical film OF.

In detail, the display device DP includes a first substrate SUB1 and a second base. The board SUB2 and a display medium layer DM, wherein the second substrate SUB2 is disposed opposite to the first substrate SUB1, and the display medium layer DM is disposed between the first substrate SUB1 and the second substrate SUB2. The first substrate SUB1 may be a TFT array substrate having a pixel array, the second substrate SUB2 may be a color filter substrate, and the display dielectric layer DM may be a liquid crystal layer. However, the invention is not limited thereto. In other embodiments, the first substrate SUB1 may be a color filter on Array (COA) integrated with a color filter layer, and the second substrate SUB2 may be a counter substrate having a common electrode. Alternatively, the first substrate SUB1 may be a thin film transistor array substrate having a pixel array, and the second substrate SUB2 may be a package cover. Further, the display medium layer DM may be an electrophoretic display medium layer, an organic electroluminescent display medium layer, or other display medium layer.

The touch sensing element TS is located on the second substrate SUB2. In this embodiment The touch display panel 100 is, for example, an in-cell touch display panel, wherein the second substrate SUB2 is located between the polarizer PZ and the touch sensing element TS, but the invention is not limited thereto.

The touch sensing element TS may be a single layer of electrode layers or double layers interlaced with each other And an electrically insulating electrode layer, wherein the electrode layer is composed of a transparent conductive material, a metal, a nanowire, a terpene, a graphene or a composite layer of the above materials. The transparent conductive material includes indium tin oxide (ITO), indium zinc oxide (IZO), aluminum zinc oxide (AZO), and the metal includes silver (Ag), aluminum (Al), Copper (Cu), chromium (Cr), titanium (Ti), molybdenum (Mo) At least one of them, a composite layer of the above materials, or an alloy of the above materials. In addition, the touch sensing element TS may be patterned to form a grid pattern, the line width of the grid pattern is, for example, between 0.5 micrometers and 10 micrometers, and the aperture ratio of the grid pattern is greater than 85%.

2A and 2B, how the first embodiment improves the invisibility and how to reduce the angle dependency during viewing will be described. 2A and 2B are schematic views of the optical film and the polarizer of FIG. 1, wherein FIGS. 2A and 2B further illustrate the sunglasses GL and its absorption axis A2.

The sunglasses GL is a polarizing element for shielding glare in the environment. In general, the polarization direction of the glare is mostly in the horizontal direction, so the direction of the absorption axis A2 of the sunglasses GL is usually designed to be horizontal. When the touch display panel is operated by two hands, the direction of the absorption axis A2 of the sunglasses GL is usually parallel to the longitudinal direction of the touch display panel, but the direction is not limit. When operating with one hand, the direction of the absorption axis A2 of the sunglasses GL is not necessarily parallel to the longitudinal direction of the touch display panel. When an optical axis OF (for example, an optical film having a phase value) has an optical axis O1 (for example, a slow axis or a fast axis) whose axial direction is not parallel to a polarization direction, the polarization state of the polarized light is changed. . However, since the prior art does not optimize the angle between the absorption axis A1 of the polarizer PZ of the touch display panel and the optical axis O1 of the optical film OF, the absorption axis A1 of the polarizer PZ and the optical axis of the optical film OF are Under the random match of O1, the light beam L' emitted by the touch display panel may be linearly polarized light, circularly polarized light or elliptically polarized light. In particular, in the case where the emitted light beam L' is linearly polarized light, if the polarization direction of the light beam L' emitted from the touch display panel is parallel to the absorption axis A2 of the sunglasses GL, the light beam L' will be absorbed by the axis. Absorbed by A2, so that the user cannot see the information displayed by the touch display panel. On the other hand, when the emitted light beam L' is elliptically polarized light, the light beam L' emitted from the touch display panel is liable to cause a sharp drop in screen brightness due to a change in viewing angle.

In view of the above, the present embodiment transmits the absorption axis A1 to the polarizer PZ. The angle of the optical axis O1 of the optical film OF is designed such that the polarization direction of the light beam L' emitted from the touch display panel is not parallel to the absorption axis A2 of the sunglasses GL, and the emitted light beam L' is lowered in each polarization direction. The difference in the component is such that, in the case where the user wears the sunglasses GL, the invisible condition is improved and the angle dependency at the time of viewing is lowered.

In detail, as shown in FIG. 2A, the polarizer PZ has an absorption axis A1 to The light beam L from the display device DP (shown in FIG. 1) is made to pass through the polarizer PZ to form first polarized light, and the polarization direction of the first polarized light is perpendicular to the absorption axis A1. Further, the optical film OF has an optical axis O1. In the present embodiment, the optical axis O1 is not perpendicular to the absorption axis A1.

Specifically, the polarizer PZ has a long side L1 and a short side L2, and is touched The control display panel 100 (shown in FIG. 1) has a reference vector D1 parallel to the long side L1, wherein the absorption axis A2 of the sunglasses GL is parallel to the reference vector D1, that is, the angle between the absorption axis A2 and the reference vector D1 is 0. degree. On the other hand, the angle between the absorption axis A1 and the reference vector D1 is θ1, and the angle between the optical axis O1 and the reference vector D1 is θ2, and 0° ≦ θ2 ≦ θ1. In other words, the angle θ2 between the optical axis O1 and the reference vector D1 of the present embodiment falls within the range of the angle θ1 between the absorption axis A1 and the reference vector D1. Due to The polarization direction of the light beam L' emitted from the touch display panel 100 is not parallel to the absorption axis A2 of the sunglasses GL. Therefore, in this embodiment, the invisible condition can be improved in the case where the user wears the sunglasses. In a preferred embodiment, if θ2 = θ 1/2, the transmittance of the light beam L' emitted from the touch display panel can be further improved.

For example, as shown in FIG. 2A, when the absorption axis A1 of the polarizer PZ is When the angle θ1 of the reference vector D1 is 45°, the angle θ2 between the optical axis O1 of the optical film OF and the reference vector D1 is, for example, 22.5°. Alternatively, as shown in FIG. 2B, when the angle θ1 between the absorption axis A1 of the polarizer PZ and the reference vector D1 is 135°, the angle θ2 between the optical axis O1 of the optical film OF and the reference vector D1 is, for example, 67.5°.

It should be noted that the absorption axis A1 of the polarizer PZ and the reference vector D1 The angle θ1 depends on the type of display panel. In other embodiments, the included angle θ1 may also be 0°, 90°, 30°, or 120°, and the corresponding included angle θ2 is, for example, 0°, 45°, 15°, and 60°.

Figure 3 is the relationship between the angle between the optical film and the reference vector and the transmittance. Figure. The curves C1, C2, C3, C4, C5, and C6 in Fig. 3 are the light beams measured by the modulation angle θ2 at the angles θ1 of 45°, 135°, 0°, 90°, 30°, and 120°, respectively. The variation in penetration after passing through the sunglasses. As can be seen from Fig. 3, when θ2 = θ1/2, the optimum transmittance can be obtained. In the present embodiment, the optical film OF is, for example, a light transmissive substrate and a decorative layer may be selectively disposed thereon. The substrate may be a rigid substrate, a flexible substrate, an insulating film, or a combination of at least two of the foregoing. For example, the material of the optical film OF is, for example, polyethylene terephthalate (PET). Due to the influence of stretched film during PET production It will lead to the occurrence of a double optical axis phenomenon, the phase difference is about 2000 nm or more, and has the performance of periodic optical characteristics. As shown in FIG. 3, the transmittance has a periodic variation amount every 90 degrees. Therefore, in another embodiment, θ2 = θ1/2 + 90° can also be obtained to obtain the desired transmittance. On the other hand, in the case where the PET has a periodic variation, the embodiment can be designed to reduce the angle between the absorption axis of the polarizer and the optical axis of the optical film, in addition to improving the invisibility. The difference in the components in the respective polarization directions of the emitted light beam L' (shown in FIG. 2A) reduces the angular dependence during viewing in the case where the user wears the sunglasses GL.

In existing electronic products, in order to execute a specific application or to achieve convenience in use, some electronic products are required to have a rotatable function. That is, when the user turns the touch display panel to 90 degrees, the display screen can correspond to the turn display. However, when the touch display panel is rotated 90 degrees, the angle between the optical axis of the optical film and the absorption axis of the sunglasses is also increased by 90 degrees. In such a case, it is necessary to simultaneously consider the curve in which the angle θ1 is different by 90 degrees in FIG. 3, that is, the curve C1 and the curve C2, the curve C3 and the curve C4, or the curve C5 and the curve C6. As can be seen from FIG. 3, when the touch display panel is a touch display panel that can be rotated, it is preferable to make θ2=45° to have better transmittance in different display directions.

It is worth mentioning that, in addition to the above-mentioned design of the angle between the absorption axis of the polarizer and the optical axis of the optical film, the present invention can also pass the polarization state of the polarized light after passing through the polarizer, for example, The linearly polarized light of the polarizer is converted into circularly polarized light, which allows the user to improve the invisibility and reduce the angular dependence during viewing in the case of wearing sunglasses. For example, in the embodiment of Figure 1, When the optical film OF is made of cellulose triacetate (TAC), polymethyl methacrylate (PMMA), polycarbonate (PC) or other phase difference can be controlled below 2000 nm. When the material is used, the optical film OF can have a phase retardation amount of a quarter wavelength. In this way, the light beam L from the display device DP is converted from the first polarized light to the second polarized light while passing through the polarizer PZ and the optical film OF, and the polarization state of the second polarized light is different from the first polarized light. Polarization state. Specifically, the first polarized light is linearly polarized light whose polarization direction is perpendicular to the absorption axis A1, and the second polarized light is circularly polarized light. Compared with the linearly polarized light, since the components of the circularly polarized light in the respective polarization directions are substantially the same, the problem of high angle dependency can be improved.

It should be noted that although the above embodiment has been described with an in-cell touch display panel, the present invention is not limited thereto. 4 to 8 are schematic cross-sectional views of a touch display panel according to second to sixth embodiments of the present invention. Referring to FIG. 4 , the touch display panel 200 of the present embodiment is substantially the same as the touch display panel 100 of FIG. 1 , and the same components are denoted by the same reference numerals and will not be described again. The difference from the touch display panel 100 is that the touch display panel 200 of the present embodiment is an on-cell touch display panel. In detail, the touch sensing component TS is located between the polarizer PZ and the second substrate SUB2, and the touch display panel 200 further includes a third substrate SUB3, wherein the touch sensing component TS and the optical film OF are respectively located at the first The opposite sides of the three substrates SUB3. The third substrate SUB3 is, for example, a cover. The cover plate is a hard substrate of high mechanical strength to provide a lower component protection function. For example, the cover plate can be a tempered glass, a glass and plastic composite substrate or a composite plastic substrate, such as a poly A composite substrate of carbonate and polymethyl methacrylate.

The touch display panel 200 of the embodiment can transmit the absorption of the polarizer PZ The angle between the shaft and the optical axis of the optical film OF is designed to improve the invisibility and reduce the angle dependence during viewing when the user wears the sunglasses. The design of the angle can be seen in FIG. 2A and FIG. 2B and FIG. 3 and their corresponding descriptions are not described herein again. In addition, the touch display panel 200 can also convert the linearly polarized light that has passed through the polarizer PZ into circularly polarized light to improve the invisibility and reduce the angular dependence during viewing. Specifically, in this embodiment, the optical film OF can have a phase retardation amount of a quarter wavelength, and the second polarized light emitted from the touch display panel 200 is circularly polarized light, thereby improving the invisibility condition and reducing the viewing time. Angle dependence. In the present embodiment, the optical film OF is, for example, a light transmissive substrate and a decorative layer may be selectively disposed thereon. Further, the third substrate SUB3 is located between the optical film OF and the polarizer PZ. That is to say, the first polarized light passes through the third substrate SUB3 and then passes through the optical film OF. In another embodiment, the third substrate SUB3 and the position of the optical film OF can be adjusted to achieve the aforementioned effect of reducing the angular dependence of viewing. In still another embodiment, the optical film OF may also be a cover plate, and a decorative layer may be selectively disposed thereon. Thus, the arrangement of the third substrate SUB3 in FIG. 4 can be omitted.

Referring to FIG. 5 , the touch display panel 300 of the present embodiment is substantially the same as the touch display panel 200 of FIG. 4 , and the same components are denoted by the same reference numerals and will not be described again. The touch sensing device of the touch display panel 300 of the present embodiment includes a first electrode TS1 and a second electrode TS2, wherein the second electrode TS2 is located in the polarizer PZ and the second Substrate SUB2 The second substrate SUB2 is disposed between the first electrode TS1 and the second electrode TS2.

The touch display panel 300 of the present embodiment can also be designed by the angle between the absorption axis of the polarizer PZ and the optical axis of the optical film OF, or by converting the linearly polarized light into circularly polarized light. In the case of wearing sunglasses, the situation of invisibility is improved and the angle dependence during viewing is improved, wherein the design of the angle can be converted into circularly polarized light by referring to FIG. 2A, FIG. 2B and FIG. 3 and their corresponding descriptions. Please refer to the corresponding description in FIG. 4, and details are not described herein again. Under the architecture of FIG. 5, the positions of the third substrate SUB3 and the optical film OF may also be reversed. In addition, the optical film OF can also be a cover plate, and a decorative layer can also be selectively disposed thereon. As such, the arrangement of the third substrate SUB3 in FIG. 5 can be omitted.

Please refer to FIG. 6 , the touch display panel 400 of the embodiment and the touch of FIG. 1 . The display panel 100 is substantially identical, and the same elements are denoted by the same reference numerals and will not be described again. The difference from the touch display panel 100 is that the polarizer PZ, the optical film OF, the touch sensing element TS, and the third substrate SUB3 of the touch display panel 400 of the present embodiment are formed on the display device DP, wherein the optical film OF Located between the polarizer PZ and the touch sensing element TS. In the present embodiment, the optical film OF is, for example, an anti-Splinted Film (ASF), wherein the explosion-proof film is disposed between the touch sensing element TS and the display device DP for use in the touch display panel 400. Avoid damage and fragmentation when used improperly or damaged by external impact. In another embodiment, the optical film OF can also be a shielding electrode film, wherein the shielding electrode film is disposed between the touch sensing component TS and the display device DP for shielding the touch sensing component TS and the display. The situation of signal interference between devices DP.

The third substrate SUB3 may be a hard transparent substrate or a soft transparent light The substrate is, for example, a glass substrate, a plastic substrate, a flexible plastic substrate such as a plastic film, or a thin glass substrate such as a glass film. The thin glass substrate may include an alkali-containing glass, an alkali-free glass or a tempered glass having a thickness of less than 0.25 mm, but is not limited thereto. The plastic film may be, for example, a polyimide (PI) film having a thickness of from 1 micrometer (μm) to 50 micrometers (μm), but not limited thereto. In addition, the third substrate SUB3 can function as a cover. The cover plate is a hard substrate of high mechanical strength to provide a lower component protection function. For example, the cover plate may be a tempered glass, a glass and plastic composite substrate or a composite plastic substrate, such as a composite substrate of polycarbonate and polymethyl methacrylate.

The touch display panel 400 of the embodiment can also pass through the suction of the polarizer PZ. Designing the angle between the retracting axis and the optical axis of the optical film OF, or by converting the linearly polarized light into circularly polarized light, allowing the user to improve the invisibility and reduce the viewing time when wearing the sunglasses. The angle dependence depends on the design of the angles of FIG. 2A, FIG. 2B and FIG. 3 and their corresponding descriptions, and the manner of converting into circularly polarized light is, for example, the optical film OF having a phase retardation of a quarter wavelength. . In this embodiment, since the light beam passes through the explosion-proof film (optical film OF) and the third substrate SUB3 after passing through the polarizer PZ, the optical film OF may also be the third substrate SUB3, so as long as the anti-explosion film and the first The angle between the optical axes of one of the three substrates SUB3 is designed, or one of the two has a phase delay amount of a quarter wavelength, which can improve the invisibility and reduce the angular dependence during viewing. . Under the architecture of FIG. 6, the optical film OF of this embodiment may be in addition to the foregoing The explosion-proof film or the shielding electrode film may also be the third substrate SUB3. In addition, the third substrate SUB3 can function as a cover. Therefore, when the optical film OF is an explosion-proof film or a shielding electrode film, the optical film OF is located between the polarizer PZ and the touch sensing element TS. When the optical film OF is a cover, the touch sensing element TS is located between the polarizer PZ and the optical film OF.

Referring to FIG. 7 , the touch display panel 500 of the present embodiment is substantially the same as the touch display panel 400 of FIG. 6 , and the same components are denoted by the same reference numerals and will not be described again. The difference from the touch display panel 400 is that the third substrate SUB3 of the touch display panel 500 of the present embodiment is a carrier substrate of the touch sensing component TS, and the touch display panel 500 further includes a cover CG, wherein the touch The control sensing element TS is located between the cover plate CG and the third substrate SUB3, and the third substrate SUB3 is bonded to the optical film OF, for example, through an adhesive layer not shown, but is not limited thereto. The touch sensing element TS may also be located on a side of the third substrate SUB3 with respect to the cover CG. In addition, the third substrate SUB3 may be a rigid transparent substrate or a flexible transparent substrate, such as a glass substrate, a plastic substrate, a flexible plastic substrate such as a plastic film, or a thin glass substrate such as a glass film. The thin glass substrate may include an alkali-containing glass, an alkali-free glass or a tempered glass having a thickness of less than 0.25 mm, but is not limited thereto. The plastic film described above may include a polyimide film, but is not limited thereto.

The touch display panel 500 of the embodiment can also pass through the suction of the polarizer PZ. Designing the angle between the retracting axis and the optical axis of the optical film OF, or by converting the linearly polarized light into circularly polarized light, allowing the user to improve the invisibility and reduce the viewing time when wearing the sunglasses. Angle dependence, where the angle is designed Referring to FIG. 2A, FIG. 2B and FIG. 3 and their corresponding descriptions, the mode of converting into circularly polarized light is, for example, by transmitting the optical film OF with a phase retardation amount of a quarter wavelength. In this way, the second polarized light emitted from the touch display panel 500 can be circularly polarized, thereby improving the invisibility and reducing the angular dependence during viewing. In this embodiment, since the light beam passes through the explosion-proof film (refer to the optical film OF), the third substrate SUB3, and the cover CG after passing through the polarizer PZ, the optical film OF may also be the third substrate SUB3 or the cover plate. CG, so as long as the angle between the optical axis of one of the explosion-proof film, the third substrate SUB3, and the cover CG is designed, or one of the three has a phase retardation amount of a quarter wavelength, Both can improve the invisibility and reduce the angular dependence during viewing. Under the structure of FIG. 7, the optical film OF of the present embodiment may be a carrier substrate or a cover plate in addition to the aforementioned explosion-proof film (or shielding electrode film). When the optical film OF is an explosion-proof film, a shielding electrode film or a carrier substrate, the optical film OF is located between the polarizer PZ and the touch sensing element TS. When the optical film OF is a cover, the touch sensing element TS is located between the polarizer PZ and the optical film OF.

Referring to FIG. 8 , the touch display panel 600 of the present embodiment is substantially the same as the touch display panel 500 of FIG. 7 , and the same components are denoted by the same reference numerals and will not be described again. The touch sensing device of the present embodiment includes a first electrode TS1 and a second electrode TS2, wherein the first electrode TS1 is located between the optical film OF and the third substrate SUB3. The second electrode TS2 is located between the cover plate CG and the third substrate SUB3, but is not limited thereto. For example, the first electrode TS1 and the second electrode TS2 of the embodiment are not limited to being simultaneously disposed at The third substrate SUB3 may be respectively disposed on two other substrates, and then the two substrates are bonded to form a touch sensing component.

By designing the angle between the absorption axis of the polarizer PZ and the optical axis of the optical film OF, or by converting the linearly polarized light into circularly polarized light, the invisible can be improved when the user wears the sunglasses. The situation and the angle dependence during viewing are reduced. The design of the included angle can be seen in Figures 2A, 2B and 3 and their corresponding descriptions. The optical film OF may be a film layer having an optical axis or a phase retarding effect disposed on the polarizer PZ, such as the aforementioned explosion-proof film, the shielding electrode film, and the carrier substrate of the touch sensing element TS (ie, the third The substrate SUB3 is at least one of the two other substrates, and one of the cover plates CG.

In summary, the touch display panel of the present invention transmits the polarization state of the polarized light after passing through the polarizer to improve the invisibility condition and reduce the angle dependency during viewing when the user wears the sunglasses.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims.

A1‧‧‧Absorption axis

A2‧‧‧ absorption axis

OF‧‧‧Optical film

D1‧‧‧ reference vector

GL‧‧‧Sunglasses

L, L’‧‧‧ beams

L1‧‧‧ long side

L2‧‧‧ Short side

O1‧‧‧ optical axis

PZ‧‧‧ polarizer

θ ₁ , θ ₂ ‧‧‧ angle

Claims (24)

A touch display panel includes: a display device; a touch sensing component disposed on the display device; a polarizer disposed on the display device; and an optical film disposed on the display device Between the optical films, the polarizer has an absorption axis, and the optical film has an optical axis, wherein the optical axis is not perpendicular to the absorption axis. The touch display panel of claim 1, wherein the display device comprises a first substrate, a second substrate, and a display medium layer, wherein the second substrate is disposed opposite to the first substrate, The display medium layer is disposed between the first substrate and the second substrate, and the touch sensing component is disposed on the second substrate. The touch display panel of the second aspect of the invention, wherein the touch sensing component is located between the polarizer and the second substrate, or the second substrate is located on the polarizer and the touch sensing Between components. The touch display panel of claim 2, wherein the touch sensing component comprises a first electrode and a second electrode, and one of the first electrode and the second electrode is located on the polarizer And the second substrate is located between the first electrode and the second electrode. The touch display panel of claim 1, wherein the optical film comprises an explosion-proof film, a shielding electrode film, a cover plate or at least one substrate. The touch display panel of claim 1, wherein the touch The sensing component is located between the polarizer and the optical film, or the optical film is located between the polarizer and the touch sensing component. The touch display panel of claim 1, further comprising a substrate, the touch sensing component is disposed on the substrate, and the polarizer is located between the display device and the substrate. The touch display panel of claim 7, wherein the optical film is located between the polarizer and the substrate. The touch display panel of claim 8, wherein the touch sensing component is located between the optical film and the substrate. The touch display panel of claim 8, wherein the optical film comprises an explosion-proof film or a shielding electrode film. The touch display panel of claim 8, wherein the touch sensing component comprises a first electrode and a second electrode, and one of the first electrode and the second electrode is located in the optical film And the substrate, and the substrate is located between the first electrode and the second electrode. The touch display panel of claim 7, wherein the substrate is a cover. The touch display panel of claim 7, wherein the touch sensing element and the optical film are respectively located on opposite sides of the substrate. The touch display panel of claim 7, wherein the substrate comprises a glass substrate, a plastic substrate, a glass film, or a plastic film. The touch display panel of claim 14, further comprising a a cover plate between the display device and the cover plate. The touch display panel of claim 15, wherein the cover comprises a tempered glass, a glass and plastic composite substrate or a composite plastic substrate. The touch display panel of claim 1, wherein the polarizer has a long side and a short side, and the touch display panel has a reference vector parallel to the long side, the absorption axis and the reference The angle of the vector is θ1, the angle between the optical axis and the reference vector is θ2, and 0° ≦ θ2 ≦ θ1. The touch display panel of claim 17, wherein θ2=θ1/2. The touch display panel of claim 17, wherein θ2=45°. The touch display panel of claim 1, wherein the polarizer has a long side and a short side, and the touch display panel has a reference vector parallel to the long side, the absorption axis and the reference The angle of the vector is θ1, the angle between the optical axis and the reference vector is θ2, and θ2 = θ1/2 + 90°. The touch display panel of claim 1, wherein the optical film is made of polyethylene terephthalate, triethylene glycol, polymethyl methacrylate or polycarbonate. A touch display panel includes: a display device; a touch sensing component located on the display device; and a polarizer disposed on the display device; An optical film disposed between the display device and the optical film, the polarizer having an absorption axis, wherein a light beam from the display device passes through the polarizer and the optical film The first polarized light is converted into a second polarized light having a polarization state different from a polarization state of the first polarized light, and a polarization direction of the first polarized light is perpendicular to the absorption axis. The touch display panel of claim 22, wherein the second polarized light is circularly polarized light. The touch display panel of claim 22, wherein the optical film provides a phase retardation amount of a quarter wavelength, and the optical film comprises an explosion-proof film, a shielding electrode film, a substrate or a cover board.