TW201430393A - Polarization conversion mechanism and method - Google Patents

Abstract

Disclosed is a polarization conversion mechanism and method, which is suitable for a display device and/or a touch screen display environment. A crystal layer utilizes a birefringent crystal glass for changing phase delay effect in accordance with crystal axial angle thereof. The crystal layer has phase delay characteristics for linear polarization so that the crystal layer can replace a quarter wavelength (1/4 λ) retarder for transforming linear polarization to circular polarized light or elliptical polarized light and emitting the light; emergent light of the display module of the display device and/or touch screen display top-down permeates a polarizing layer with linear polarizer function and the crystal layer to be transformed to a circular polarized light or an elliptical polarized light and emitted.

Description

Polarization conversion mechanism and method

The present invention relates to a polarization conversion mechanism and method, and more particularly to a polarization conversion mechanism and method suitable for use in a display device and/or a touch display device environment, wherein the crystal layer is a birefringent crystal glass. For linear polarization, the phase retardation is such that the crystal layer can replace a quarter-wavelength (1/4 λ) retarder and convert the linearly polarized light into circularly polarized or elliptically polarized light and exit.

Display screens and/or touch screens for display devices/touch display devices/mobile devices. For visibility in bright light environments, linear polarizers or circular polarizers are usually attached (line polarizers plus one quarter) One wavelength retarder) to reduce external light interference; the current practice is to attach a structure to the outside of the display screen and/or the touch screen as a quarter-wave retarder/line polarizer/quarter. A polarizer for a wavelength retarder.

In the theory of polarization, a light passes through a wavelength phase retardation plate, and its wavelength phase difference (δ) is defined as Where n is the refractive index of the phase retardation plate; d is the thickness of the phase retardation plate; λ is the wavelength of the light wave passing through the phase retardation plate, and is called linearly polarized light when δ=π; It is called circularly polarized light; the remaining phase difference is called elliptically polarized light. when An odd multiple, the phase difference is consistent The phase retardation plate is called a quarter-wave retardation plate, and the linearly polarized light is converted into a circularly polarized light through the phase retardation plate. When the birefringent crystal is Δ n = n _e - n _o , its Δ n is substituted for n . meets the Also known as a quarter-wave retardation plate; it can be seen that a visible wavelength ( λ ) contains a linear polarization of 400 nm to 700 nm through a quarter-wave retardation plate, except that a single wavelength is matched. For a circularly polarized light, the remaining wavelengths are elliptically polarized light close to the circularly polarized light, and when the elliptically polarized light passes through the linear polarizer, there is a change in luminous flux with a change in the line deflection angle.

Nowadays, with the advancement of technology, the past sunglasses absorb the light to counter the strong too The way of sunlight is gradually replaced by the technique of applying linear polarizing plate technology to attenuate the light intensity by about half. When the user wears a pair of sunglasses with a linear polarizing plate to view the display device that emits light as linearly polarized light, if it is displayed When the polarization direction of the linearly polarized light emitted by the device is perpendicular to the direction of polarization of the polarizing plate of the sunglasses, the screen of the display device is unrecognizable, and when the polarization direction of the linearly polarized light is at an angle with the direction of polarization of the linear polarizing plate, Some of the light components cannot pass through the linear polarizing plate, and the visibility of the display device is lowered. Therefore, a method of adding a wavelength retarder on one side of the linear polarizing plate is developed, and the emitted light of the display device is converted from linearly polarized light to circularly polarized light or elliptically polarized light by a wavelength retarder, due to circularly polarized or elliptically polarized light to the linear polarizing plate. The high transmittance can avoid the problem that the above display device cannot pass the polarized sunglasses or the visibility is poor.

In other words, from the conventional sunglasses that absorb the dimming method, the sunglasses that use the line polarizer or the circular polarizer are advanced, so that the polarizer of the display screen is circularly polarized so that the information displayed on the screen can be seen wearing the sunglasses. A sheet (a linear polarizer plus a quarter-wave retarder or a quarter-wave retarder plus a linear polarizer plus a quarter-wave retarder) reduces incident light reflection and converts the emitted light from linear to circular Polarization, so that not only the thickness is increased, but also the cost of the polarizer is increased. At the same time, the light intensity is attenuated due to the increase in the number of layers.

Another common application method of the linear polarizer is to provide a small-sized (touch) display device, and a wavelength phase retarder disposed inside the linear polarizer to sequentially pass the incident natural light through the linear polarizer and the wavelength phase retarder. Converted to circularly polarized or elliptically polarized light, since the circularly polarized or elliptically polarized light is reflected by the interface between the elements in the display device, the direction of rotation will be opposite to the incident light, and the original wavelength phase retarder will become the polarization direction and the polarization direction of the linear polarizer. Since the vertical line is polarized and cannot pass through the linear polarizing plate, the amount of reflected light can be reduced, the interference of the light emitted from the display device itself can be reduced, and the visibility in a strong light environment can be improved.

Therefore, in the current display device/touch display device, a wavelength phase retarder is disposed on one side of the outer polarizing plate to convert the emitted light into circularly polarized light, and a wavelength is disposed inside the linear polarizing plate. Phase retarder to reduce reflected light or to provide a wavelength phase retarder inside and outside the linear polarizer to simultaneously convert the outgoing light into circularly polarized light and reduce the interference of reflected light. However, the linear polarizer and wavelength delay are required. The more the number of layers, the thicker the thickness, the higher the cost, and the lower the utilization of light. Thus, how to reduce the thickness of the screen and reduce the use of expensive polarizers has become a problem to be overcome.

Therefore, how to find a polarization conversion technology suitable for the environment of a display device and/or a touch display device can generate a phase delay effect, and has a phase delay characteristic for the linearly polarized light, so that the linear polarization can be eliminated without using a quarter-wave retardation film. When it is converted into circular or elliptically polarized light, it is a problem to be solved by using a polarizer having a simple structure to reduce the thickness of the screen and reducing the use of a polarizing plate which is expensive to use.

The main purpose of the present invention is to provide a polarization conversion mechanism and method suitable for the environment of a display device and/or a touch display device. The crystal layer is a birefringent crystal glass, which can produce a phase delay effect along the axial angle of the crystal axis. Variation, because the crystal layer has a phase retardation characteristic for linearly polarized light, the crystal layer can replace a quarter-wave retarder and convert the linearly polarized light into circularly polarized or elliptically polarized light and exit through the crystal axial angle and line. The control of the polarizing direction of the polarizer can produce a glass window display of the display device and/or the touch display device which does not change with the vertical or horizontal display direction of the display device under the polarizing window.

Another object of the present invention is to provide a polarization conversion mechanism and method suitable for use in a display device and/or a touch display device environment, without using a quarter-wave retardation film, but using a crystal layer to polarize the line. For circular or elliptically polarized light, a polarizer with a simple structure can be used to reduce the thickness of the display device and/or the touch display device, reduce the use of expensive polarizers, and reduce the cost, through the crystal axial angle and linear polarization. The control of the polarization direction of the sheet can produce a glass window display that changes the display brightness without changing the vertical or horizontal direction of the display device under the polarizing window.

According to the above, the polarization conversion mechanism of the present invention comprises a crystal layer and a polarizing layer. Here, the polarization conversion mechanism can be applied to a display device and/or a touch display device, for example, an LCD display device, and an OLED. Display device, Out-Cell LCD touch display device, In-Cell LCD touch display device, On-Cell LCD touch display device, In-Cell/On-Cell hydride LCD touch display device, Out-Cell OLED touch Display device, On-Cell OLED touch display device, In-Cell OLED touch display device.

a crystal layer which uses a birefringent crystal glass to change the phase retardation effect according to the axial angle of the crystal axis. Since the crystal layer has a phase retardation characteristic for linearly polarized light, the crystal layer can replace a quarter wavelength. Delaying the sheet and letting the light passing through the crystal layer have a phase retardation of the wavelength, and converting the linearly polarized light into circularly polarized or elliptically polarized light and exiting; here, the crystal layer is used with a specific axial direction and Δn=n _e - The birefringent crystal glass of n _o ≠0 is used as a glass window, and the birefringent crystal glass is a sapphire glass layer or a quartz glass layer, wherein the crystal direction of the sapphire glass layer can be C axis, M axis, A axis or For the R-axis, the quartz glass uses a C-axis crystal face of a left-handed structure and a right-handed structure.

a polarizing layer having at least one linear polarizing plate to have a linear polarizing plate function, and the light emitted from the display module of the display device and/or the touch display device sequentially passes through a polarizing layer having a linear polarizing plate function and a crystal layer And converting into a circularly polarized light or an elliptically polarized light and emitting it, thereby increasing the visibility of the emitted light; here, since the crystal layer is made of a birefringent crystal glass and has the characteristics of a wavelength phase retarder, the crystal layer can be Instead of a quarter-wave retarder, in other words, there is no need to have a quarter-wave retarder as in the prior art between the crystal layer and the linear polarizer.

In addition, in some embodiments, in order to reduce incident light reflection of the incident display device and/or the touch display device, the polarizing layer may be a circular polarizing plate and have a circular polarizing plate function, and the polarizing layer is divided by the circular polarizing plate. In addition to the one-line polarizer, the complex may comprise a quarter-wave retarder, wherein the linear polarizer is between the crystal layer and the quarter-wave retarder and is incident on the display device and/or The incident light of the touch display device sequentially passes through the linear polarizing plate and the quarter-wave retarder to be converted into a circularly polarized light or an elliptically polarized light, and the reflected light is generated on the reflective interface, and the reflected light is reflected. First, the quarter-wave retarder is used to form a linearly polarized light whose polarization direction is perpendicular to the direction in which the linear polarizing plate is polarized, and the linear polarizing film cannot pass through, thereby reducing the intensity of the reflected light and reducing the reflection. Features.

When performing the process of the polarization conversion method of the present invention, first, a display device having a display module, and/or a touch display device having a touch/display module; and then, on the display device display module, and/or Alternatively, a touch conversion mechanism having a crystal layer and a polarizing layer is disposed on the touch/display module of the touch display device.

In order to make the person skilled in the art understand the purpose, features and effects of the present invention, the following detailed description and the accompanying drawings Add a note like this:

1‧‧‧ Polarization conversion mechanism

10‧‧‧LCD module

101‧‧‧Color filter glass

102‧‧‧Color filters

103‧‧‧Liquid layer

104‧‧‧Thin-film transistor circuit

105‧‧‧ glass substrate

106‧‧‧Line polarizer

107‧‧‧Backlight

14‧‧‧Touch Module

140‧‧‧Y transparent conductive film

1401‧‧‧reflection interface

142‧‧‧Insulation

144‧‧‧X transparent conductive film

2‧‧‧ crystal layer

3‧‧‧ polarizing layer

30‧‧‧Top OLED display module

300‧‧‧Thin-film transistor circuit

302‧‧‧OLED layer

304‧‧‧reflective layer

306‧‧‧Substrate

31‧‧‧Line polarizer

32‧‧‧ Quarter-wave retarder

33‧‧‧Line polarizer

34‧‧‧Touch Module

340‧‧‧Y transparent conductive film

3401‧‧‧reflection interface

342‧‧‧Insulation

344‧‧‧X transparent conductive film

35‧‧‧Line polarizer

36‧‧‧ Quarter-wave retarder

37‧‧‧Line polarizer

4, 5, 6, 7‧‧‧ touch display devices

L1‧‧‧Out of light

L2‧‧‧ incident light

L3‧‧‧ reflected light

11, 12, 21, 22, 41, 42, 51, 52, 61, 62 ‧ ‧ steps

1 is a schematic diagram showing the architecture and operation of the polarization conversion mechanism of the present invention; and FIG. 2 is a flow chart for illustrating the use of the polarization conversion mechanism of the present invention as shown in FIG. The flow chart of the polarization conversion method is performed; FIG. 3 is a schematic diagram showing the architecture and operation of an embodiment of the polarization conversion mechanism of the present invention; and FIG. 4 is a flow chart for illustrating the use of The embodiment of the polarization conversion mechanism of the present invention in FIG. 3 is a flow step of performing a polarization conversion method; and FIG. 5 is a schematic diagram showing the architecture and operation of still another embodiment of the polarization conversion mechanism of the present invention. 6 is a flow chart for showing a flow chart for explaining a polarization conversion method using an embodiment of the polarization conversion mechanism of the present invention as shown in FIG. 5; FIG. 7 is a schematic view for explaining the explanation The architecture and operation of a further embodiment of the polarization conversion mechanism of the present invention; FIG. 8 is a flow chart for illustrating the use of the present invention as shown in FIG. Embodiments of the conversion mechanism to perform the flow steps of the polarization conversion method; FIG. 9 is a schematic diagram showing the architecture and operation of another embodiment of the polarization conversion mechanism of the present invention; and FIG. 10 is a flow Figure for illustrating the flow steps of an embodiment for performing a polarization conversion method using an embodiment of the polarization conversion mechanism of the present invention as in Figure 9.

Figure 1 is a schematic diagram showing the architecture and operation of the polarization conversion mechanism of the present invention. As shown in FIG. 1 , the polarization conversion mechanism 1 of the present invention includes a crystal layer 2 and a polarizing layer 3 . Here, the polarization conversion mechanism 1 can be applied to a display device and/or a touch display device, for example. , LCD display device, OLED display device, Out-Cell LCD Touch display device, In-Cell LCD touch display device, On-Cell LCD touch display device, In-Cell/On-Cell hydride LCD touch display device, Out-Cell OLED touch display device, On-Cell OLED Touch display device, In-Cell OLED touch display device.

The crystal layer 2 is a birefringent crystal glass, which can change the phase retardation effect according to the axial angle of the crystal axis. Since the crystal layer 2 has a wavelength phase retardation characteristic for the linearly polarized light, the crystal layer 2 can be replaced by a crystal layer 2 The quarter-wave retarder not only enhances the hardness and wear-resistant scratch resistance, but also causes phase delay of the light passing through the crystal layer 2, converting the linearly polarized light into circularly polarized or elliptically polarized light and exiting.

The polarizing layer 3 has at least one linear polarizing plate 31, and the light emitted from the display module of the display device and/or the touch display device sequentially passes through the linear polarizing plate 31 of the polarizing layer 3 and the crystal layer 2, And converted into a circularly polarized light or an elliptically polarized light and emitted, thereby increasing the visibility of the outgoing light; here, since the crystal layer 2 is made of birefringent crystal glass and has a wavelength phase retardation characteristic, the crystal layer 2 can be replaced. A quarter-wave retarder, in other words, between the crystal layer 2 and the linear polarizer 31, does not have to have a quarter-wave retarder as in the prior art.

In addition, in some embodiments, in order to reduce the reflection of incident light of the display device and/or the touch display device, the polarizing layer 3 may be a circular polarizing plate, and the polarizing layer 3 of the circular polarizing plate includes a linear polarizing plate 31. In addition, the complex may include a quarter-wave retarder 32, where the linear polarizer 31 is located between the crystal layer 2 and the quarter-wave retarder 32, and is incident on the display device and/or touch. The incident light of the control display device sequentially passes through the linear polarizing plate 31 and the quarter-wave retarder 32, and then converts into a circularly polarized light or an elliptically polarized light, and generates reflected light on the reflective interface, and reflects The light first passes through the quarter-wave retarder 32 to become a linearly polarized light whose polarization direction is perpendicular to the direction in which the linear polarizing film 31 is deflected, and cannot pass through the linear polarizing plate 31, whereby the intensity of the reflected light can be reduced. With anti-reflection function.

In other words, the quarter-wave retarder 32 disposed on one side of the linear polarizer 31 is used to sequentially pass the incident light of the incident display device and/or the touch display device through the linear polarizer 31 and the quarter. After the wavelength retarder 32, it will be converted into circularly polarized or elliptically polarized light, and the reflected light generated by the reflective device which is circularly polarized or elliptically polarized is reflected by the reflective interface between the display device and/or the components in the touch display device. The direction of rotation will be opposite to the incident light, and the reflected light will pass. After passing through the quarter-wave retarder 32, the linearly polarized light having a direction perpendicular to the polarizing direction of the linear polarizing plate 31 is polarized and cannot pass through the linear polarizing plate 31. Therefore, the amount of reflected light can be reduced, and the display device and/or the display device can be reduced. The touch display device itself emits light interference, and can improve the visibility in a strong light environment.

Here, the crystal layer 2 can make the birefringent crystal glass having a specific axial direction and Δn=n _e -n _o ≠0 as a glass light transmission window, and the thickness of the crystal layer is a light transmission wavelength greater than 100 times; The birefringent crystal glass is a sapphire glass layer or a quartz glass layer, wherein the crystal of the sapphire glass layer can be C-axis, M-axis, A-axis or R-axis, and the quartz glass uses a left-handed structure and a right-handed structure. The axial plane depends on the actual implementation; the polarizing layer 3 can use a simple polarizer to reduce the cost, and the polarizer can be attached to the front side and the back side, and/or the polarizing layer 3 is applied. According to the actual design requirements, the functional layer that omits scratch resistance and anti-glare can be omitted, depending on the actual implementation.

Fig. 2 is a flow chart for showing the flow of steps for performing a polarization conversion method using the polarization conversion mechanism of the present invention as shown in Fig. 1. As shown in FIG. 2, first, in step 11, a display device having a display module and/or a touch display device having a touch/display module is prepared, and the process proceeds to step 12.

In step 12, a polarization conversion mechanism having a crystal layer and a polarizing layer is disposed on the display device display module and/or on the touch/display module of the touch display device.

Figure 3 is a schematic diagram showing the architecture and operation of an embodiment of the polarization conversion mechanism of the present invention. As shown in FIG. 3, the polarization conversion mechanism 1 of the present invention includes a crystal layer 2 and a polarizing layer 3. Here, the polarization conversion mechanism 1 can be applied to the touch display device 4, for example, an external embedded type. (On-Cell) LCD touch display device.

The touch display device 4 includes a liquid crystal display module 10, a touch module 14, and a polarization conversion mechanism 1. The liquid crystal display module 10 includes a color filter glass 101 and a color filter from top to bottom. a light sheet 102, a liquid crystal layer 103, a thin film transistor circuit 104, a glass substrate 105, a linear polarizing film 106, and a backlight 107; the touch module 14 located above the liquid crystal display module 10 (from top to bottom) a Y-transparent conductive film (ITO) 140, an insulating layer 142, and an X-pole transparent conductive film 144; the polarizing conversion mechanism 1 covering the touch module 14 includes a crystal layer 2, and a polarizing layer 3, Therefore, in order to reduce incident light incident on the LCD touch display device 4 The reflection of L2, wherein the polarizing layer 3 is a circular polarizing plate, and the polarizing layer 3 which is a circular polarizing plate comprises a quarter-wave retarder 32 in addition to the linear polarizing plate 31.

The emitted light L1 of the touch display device 4 is converted into a circularly polarized light or an elliptically polarized outgoing light L1 from the bottom to the top, through the linear polarizing plate 31 of the polarizing layer 3, and the crystal layer 2, and is emitted. Increasing the visibility of the outgoing light L1; here, since the crystal layer 2 is characterized by a wavelength phase retardation using a birefringent crystal glass, the crystal layer 2 can replace a quarter-wave retarder, in other words, in the crystal layer There is no need to have a quarter-wave retarder as in the prior art between the linear polarizing plate 31 and the linear polarizing plate 31.

The crystal layer 2 is a birefringent crystal glass having a wavelength phase retardation characteristic, which can change a phase retardation effect with respect to the axial angle of the crystal axis, since the crystal layer 2 is linearly polarized for passing through the linear polarizing plate 31. The outgoing light L1 has a phase retardation characteristic, so that the crystal layer 2 can replace a quarter-wave retarder and let the outgoing light L1 passing through the crystal layer 2 have a phase delay of a quarter wavelength, and The outgoing light L1 that is linearly polarized is converted into circularly polarized light or emitted light L1 that is elliptically polarized and emitted.

The polarizing layer 3, in addition to the linear polarizing plate 31, may further comprise a quarter-wave retarder 32, wherein the linear polarizing film 31 is located in the crystal layer 2 and the quarter-wavelength The incident light L2 incident between the retardation sheets 32 and incident on the touch display device 4 is converted into a circularly polarized light or an elliptically polarized light after passing through the linear polarizing plate 31 and the quarter-wave retarder 32. The reflected light L3 is generated by the reflective interface 1401 of the Y-transparent conductive film (ITO) 140, and the reflected light L3 first passes through the quarter-wave retarder 32 to become a polarization direction perpendicular to the linear polarizing plate 31. The line is polarized and thus cannot pass through the linear polarizing plate 31, whereby the intensity of the reflected light L3 can be reduced, and the anti-reflection function can be achieved.

In other words, the incident light L2 incident on the touch display device 4 is sequentially passed through the linear polarizing plate 31 and the quarter-wave retarder in cooperation with the quarter-wave retarder 32 disposed on one surface of the linear polarizing film 31. After 32, it will be converted into circularly polarized or elliptically polarized light, and the direction of rotation of the reflected light L3 generated by the incident light L2 which is circularly polarized or elliptically polarized is reflected by the reflective interface 1401 in the touch display device 4 The light L2 is reversed, and the reflected light L3 passes through the quarter-wave retarder 32, and becomes linearly polarized in a direction perpendicular to the polarization direction of the linear polarizing plate 31, and cannot pass through the linear polarizing plate 31. Therefore, the amount of reflected light can be reduced. , reducing the touch display device 4 It emits the interference of the light L1 itself, and can improve the visibility in a strong light environment.

Here, the crystal layer 2 can make the birefringent crystal glass having a specific axial direction and Δn=n _e -n _o ≠0 as a glass light transmission window, and the thickness of the crystal layer is a light transmission wavelength greater than 100 times; The birefringent crystal glass is a sapphire glass layer or a quartz glass layer, wherein the crystal of the sapphire glass layer can be C-axis, M-axis, A-axis or R-axis, and the quartz glass uses a left-handed structure and a right-handed structure. The axial plane depends on the actual implementation; the polarizing layer 3 can use a simple polarizer to reduce the cost, and the polarizer can be attached to the front side and the back side, and/or the polarizing layer 3 is applied. According to the actual design requirements, the functional layer that omits scratch resistance and anti-glare can be omitted, depending on the actual implementation.

In this embodiment, the polarization conversion mechanism 1 is applied to the touch display device 4, and the touch display device 4 is an On-Cell LCD touch display device. However, for the out-cell (Out-Cell) The LCD touch display device and the in-cell (In-Cell) LCD touch display device are the same, similar to those described in the embodiment, and are not described herein again; The mechanism 1 is applied to the touch display device 4. However, the polarized light conversion mechanism 1 is applied to the LCD display device, which is the same as that described in the embodiment, and will not be described herein.

Fig. 4 is a flow chart for showing the flow of steps for performing a polarization conversion method using an embodiment of the polarization conversion mechanism of the present invention as shown in Fig. 3. As shown in FIG. 4, first, in step 21, a touch display device 4 having a liquid crystal display module 10 and a touch module 14 is prepared, wherein the touch module 14 is located in the liquid crystal display module 10. Above, and proceed to step 22.

In step 22, a polarization conversion mechanism 1 having a crystal layer 2 and a polarizing layer 3 is disposed on the touch module 14 of the touch display device 4.

Figure 5 is a schematic diagram showing the architecture and operation of yet another embodiment of the polarization conversion mechanism of the present invention. As shown in FIG. 5, the polarization conversion mechanism 1 of the present invention includes a crystal layer 2 and a polarizing layer 3. Here, the polarization conversion mechanism 1 can be applied to the touch display device 5, for example, an external embedded type. (On-Cell) LCD touch display device.

The touch display device 5 includes a liquid crystal display module 10, a touch module 14, and a polarization conversion mechanism 1. The liquid crystal display module 10 includes a color filter glass 101 and a color filter from top to bottom. Light sheet 102, a liquid crystal layer 103, a thin film transistor circuit 104, a glass a glass substrate 105, a linear polarizing film 106, and a backlight 107; the touch module 14 (top to bottom) on the liquid crystal display module 10 includes a Y-transparent conductive film (ITO) 140 and an insulating layer. 142 and an X-pole transparent conductive film 144; the polarization conversion mechanism 1 covering the touch module 14 includes a crystal layer 2 and a polarizing layer 3, wherein the polarizing layer 3 is a linear polarizing plate 33.

The emitted light L1 of the touch display device 5 passes through the linear polarizing plate 33 and the crystal layer 2 from bottom to top, and is converted into a circularly polarized light or an elliptically polarized outgoing light L1, and is emitted to increase the outgoing light L1. Visibility; here, since the crystal layer 2 is a birefringent crystal glass and has the characteristics of a wavelength phase retarder, the crystal layer 2 can replace a quarter-wave retarder, in other words, the crystal layer 2 and the line It is not necessary to have one quarter-wave retarder as in the prior art between the polarizing plates 33.

The crystal layer 2 is a birefringent crystal glass having a wavelength phase retardation characteristic, which can change a phase retardation effect depending on the axial angle of the crystal axis, since the crystal layer 2 is linearly polarized for passing through the linear polarizing plate 33. The outgoing light L1 has a phase retardation characteristic, so that the crystal layer 2 can replace a quarter-wave retarder and let the outgoing light L1 passing through the crystal layer 2 have a phase delay of a quarter wavelength, and The outgoing light L1 that is linearly polarized is converted into circularly polarized light or emitted light L1 that is elliptically polarized and emitted.

Here, the crystal layer 2 can make the birefringent crystal glass having a specific axial direction and Δn=n _e -n _o ≠0 as a glass light transmission window, and the thickness of the crystal layer is a light transmission wavelength greater than 100 times; The birefringent crystal glass is a sapphire glass layer or a quartz glass layer, wherein the crystal of the sapphire glass layer can be C-axis, M-axis, A-axis or R-axis, and the quartz glass uses a left-handed structure and a right-handed structure. The axial plane depends on the actual implementation; the polarizing layer 3 can use a simple polarizer to reduce the cost, and the polarizer can be attached to the front side and the back side, and/or the polarizing layer 3 is applied. According to the actual design requirements, the functional layer that omits scratch resistance and anti-glare can be omitted, depending on the actual implementation.

In this embodiment, the polarization conversion mechanism 1 is applied to the touch display device 5, and the touch display device 5 is an On-Cell LCD touch display device. However, for the out-cell (Out-Cell) The LCD touch display device and the in-cell (In-Cell) LCD touch display device are the same, similar to those described in the embodiment, and are not described herein again; Mechanism 1 is applied to the touch display device 5, however, for the polarization conversion mechanism 1 is applied to the LCD display device The reason is the same, similar to that described in the embodiment, and is not described here.

Figure 6 is a flow chart showing the flow steps for carrying out the birefringence method using an embodiment of the polarization conversion mechanism of the present invention as shown in Figure 5. As shown in FIG. 6 , firstly, in step 41, the touch display device 5 having the liquid crystal display module 10 and the touch module 14 is prepared. The touch module 14 is located in the liquid crystal display module 10 . Above, and proceed to step 42.

In step 42 , a polarization conversion mechanism 1 having a crystal layer 2 and a polarizing layer 3 is disposed on the touch module 14 of the touch display device 5 .

Figure 7 is a schematic diagram showing the architecture and operation of a further embodiment of the polarization conversion mechanism of the present invention. As shown in FIG. 7, the polarization conversion mechanism 1 of the present invention includes a crystal layer 2 and a polarizing layer 3. Here, the polarization conversion mechanism 1 can be applied to the touch display device 6, for example, an in-line type. (In-Cell) top-emitting organic light-emitting diode OLED touch display device.

The touch display device 6 includes a top emission organic light emitting diode (OLED) display module 30, a touch module 34, and a polarization conversion mechanism 1. The top light emitting OLED display module 30 is composed of The upper and lower portions include a thin film transistor circuit 300, an OLED layer 302, a reflective layer 304, and a substrate 306; the touch module 34 (from top to bottom) under the top emitting OLED display module 30 includes a Y-transparent conductive film (ITO) 340, an insulating layer 342, and an X-pole transparent conductive film 344; the polarizing conversion mechanism 1 covering the touch module 34 includes a crystal layer 2 and a polarizing layer 3, where The reflection of the incident light L2 incident on the touch display device 6 is reduced, wherein the polarizing layer 3 is a circular polarizing plate, and the polarizing layer 3 which is a circular polarizing plate includes a quarter-polarizing plate 35, and includes a quarter. A wavelength retarder 36.

The outgoing light L1 of the touch display device 6 passes through the linear polarizing plate 35 of the polarizing layer 3 and the crystal layer 2 from bottom to top, and is converted into a circularly polarized light or an elliptically polarized outgoing light L1 and emitted, which can be increased. The visibility of the outgoing light L1; here, since the crystal layer 2 is characterized by a wavelength phase retardation using a birefringent crystal glass, the crystal layer 2 can replace a quarter-wave retarder, in other words, the crystal layer 2 There is no need to have a quarter-wave retarder as in the prior art with the linear polarizing plate 35.

Crystal layer 2, which uses birefringent crystal glass and has a wavelength phase retardation characteristic, which can change phase retardation effect with the axial angle of the crystal axis, due to the crystal layer 2 pair The outgoing light L1 which is linearly polarized through the linear polarizing plate 35 has a phase retardation characteristic, so that the crystal layer 2 can replace a quarter-wave retarder and let the outgoing light L1 passing through the crystal layer 2 have four points. The phase of one of the wavelengths is delayed, and the outgoing light L1 that is linearly polarized can be converted into circularly polarized light or emitted light L1 that is elliptically polarized and emitted.

The polarizing layer 3, in addition to the linear polarizing plate 35, may further comprise a quarter-wave retarder 36, wherein the linear polarizing plate 35 is located in the crystal layer 2 and the quarter-wavelength The incident light L2 incident between the retardation sheets 36 and incident on the touch display device 6 is converted into a circularly polarized light or an elliptically polarized light after passing through the linear polarizing plate 35 and the quarter-wave retarder 36. The reflected light L3 is generated by the reflective interface 3401 of the Y-transparent conductive film (ITO) 340, and the reflected light L3 first passes through the quarter-wave retarder 36 to become a polarization direction perpendicular to the linear polarizing plate 35. The line is polarized and thus cannot pass through the linear polarizing plate 35, whereby the intensity of the reflected light L3 can be reduced and the anti-reflection function can be achieved.

In other words, the quarter-wave retarder 36 disposed on one side of the linear polarizer 35 is used to sequentially pass the incident light L2 incident on the touch display device 6 through the linear polarizer 35 and the quarter-wave retarder. After 36, it will be converted into circularly polarized or elliptically polarized light, and the direction of rotation of the reflected light L3 generated by the incident light L2 which is circularly polarized or elliptically polarized is reflected by the reflective interface 3401 in the touch display device 6 The light L2 is reversed, and the reflected light L3 passes through the quarter-wave retarder 36, and becomes linearly polarized in a direction perpendicular to the polarization direction of the linear polarizing plate 35, and cannot pass through the linear polarizing plate 35. Therefore, the amount of reflected light can be reduced. The interference of the light L1 emitted from the touch display device 6 itself is reduced, and the visibility in a strong light environment can be improved.

In the present embodiment, the polarization conversion mechanism 1 is applied to the touch display device 6, and the touch display device 6 is an in-cell (In-Cell) top-emitting organic light-emitting diode OLED touch display device. The external-type (In-Cell) OLED touch display device and the in-cell (In-Cell) OLED touch display device are the same, similar to those described in the embodiment, and are no longer used herein. Further, although the polarization conversion mechanism 1 is applied to the touch display device 6, the polarization conversion mechanism 1 is applied to the OLED display device, which is the same as the one described in the embodiment. , will not repeat them here.

Fig. 8 is a flow chart for showing the flow of steps for performing a polarization conversion method using an embodiment of the polarization conversion mechanism of the present invention as shown in Fig. 7. As shown in Figure 8 First, in step 51, the touch display device 6 having the top-emitting OLED display module 30 and the touch module 34 is prepared. The touch module 34 is located under the top-emitting OLED display module 30. And proceeds to step 52.

In step 52, a polarizing conversion mechanism 1 having a crystal layer 2 and a polarizing layer 3 is disposed on the touch module 34 of the touch display device 6, wherein the polarizing layer 3 includes a linear polarizing plate 35 and a quarter. One of the wavelength retarders 36.

Figure 9 is a schematic diagram showing the architecture and operation of another embodiment of the polarization conversion mechanism of the present invention. As shown in FIG. 9, the polarization conversion mechanism 1 of the present invention includes a crystal layer 2 and a polarizing layer 3. Here, the polarization conversion mechanism 1 can be applied to the touch display device 7, for example, an in-line type. (In-Cell) top-emitting organic light-emitting diode OLED touch display device.

The touch display device 7 includes a top-emitting organic light-emitting diode (OLED) display module 30, a touch module 34, and a polarization conversion mechanism 1. The top-emitting OLED display module 30 is connected from top to bottom. The invention comprises a thin film transistor circuit 300, an OLED layer 302, a reflective layer 304 and a substrate 306. The touch module 34 (from top to bottom) under the top emitting OLED display module 30 comprises a Y-transparent a conductive film (ITO) 340, an insulating layer 342, and an X-pole transparent conductive film 344; the polarization conversion mechanism 1 covering the touch module 34 includes a crystal layer 2 and a polarizing layer 3, wherein the polarizing layer 3 is a line Polarizing plate 37.

The light L1 emitted from the touch display device 7 passes through the polarizing layer 3 which is the linear polarizing plate 37 and the crystal layer 2 from bottom to top, and is converted into a circularly polarized light or an elliptically polarized light L1 and emitted. Increasing the visibility of the outgoing light L1; here, since the crystal layer 2 is made of a birefringent crystal glass and has the characteristics of a wavelength phase retarder, the crystal layer 2 can replace a quarter-wave retarder, in other words, the crystal There is no need to have a quarter-wave retarder as in the prior art between the layer 2 and the linear polarizing plate 37.

The crystal layer 2 is a birefringent crystal glass having a wavelength phase retardation characteristic, and a phase retardation effect change occurs depending on the axial angle of the crystal axis, since the crystal layer 2 is linearly polarized for passing through the linear polarizing plate 37. The outgoing light L1 has a phase retardation characteristic, so that the crystal layer 2 can replace a quarter-wave retarder and let the outgoing light L1 passing through the crystal layer 2 have a phase delay of a quarter wavelength, and For the linearly polarized outgoing light L1, it becomes a circularly polarized light or It is an elliptically polarized outgoing light L1 and is emitted.

In the present embodiment, the polarization conversion mechanism 1 is applied to the touch display device 7, and the touch display device 7 is an in-cell (In-Cell) top-emitting organic light-emitting diode OLED touch display device. The external-type (In-Cell) OLED touch display device and the in-cell (In-Cell) OLED touch display device are the same, similar to those described in the embodiment, and are no longer used herein. Further, although the polarization conversion mechanism 1 is applied to the touch display device 7, the polarization conversion mechanism 1 is applied to the OLED display device, which is the same as that described in the embodiment. , will not repeat them here.

Fig. 10 is a flow chart for showing the flow of steps for performing a polarization conversion method using an embodiment of the polarization conversion mechanism of the present invention as shown in Fig. 9. As shown in FIG. 10, first, in step 61, a touch display device 7 having a top-emitting OLED display module 30 and a touch module 34 is prepared, wherein the touch module 34 is located at the top-emitting OLED. Below the display module 30, the process proceeds to step 62.

In step 62, a polarization conversion mechanism 1 having a crystal layer 2 and a polarizing layer 3 is disposed on the touch module 34 of the touch display device 7, wherein the polarizing layer 3 is a linear polarizing plate 37.

In combination with the above embodiments, we can obtain a polarization conversion mechanism and method of the present invention, which is suitable for use in a display device and/or a touch display device environment. The crystal layer is a birefringent crystal glass, and can be axially angled with the crystal axis. The phase delay effect is changed. Since the crystal layer has a phase retardation characteristic for the linearly polarized light, the crystal layer can replace a quarter-wave retarder and convert the linearly polarized light into circularly polarized or elliptically polarized light and exit; the display device and And the light emitted from the display module of the touch display device is converted into a circularly polarized light or an elliptically polarized light and emitted through the polarizing layer having the function of the linear polarizing plate and the crystal layer from top to bottom. The polarization conversion mechanism and method of the present invention can reduce the number of layers provided by using the crystal layer of the birefringent crystal glass, thereby reducing the thickness of the display device and/or the touch display device, and reducing the cost, and transmitting the crystal through the crystal. The axial angle and the polarization direction of the linear polarizer can be used to manufacture a glass window display of the display device and/or the touch display device that does not change with the vertical or horizontal display direction of the display device under the polarizing window. . The polarization conversion mechanism and method of the present invention include the following advantages:

1. Providing a polarization conversion mechanism and method suitable for the environment of a display device and/or a touch display device, wherein the crystal layer is a birefringent crystal glass, which can change the phase retardation effect according to the axial angle of the crystal axis, due to the crystal layer Linear polarized light has a phase retardation characteristic, so the crystal layer can replace a quarter-wave retarder and convert the linearly polarized light into circularly polarized or elliptically polarized light and emit it, and the axial direction of the crystal and the polarization direction of the linear polarizer are controlled. The glass window display of the display device and/or the touch display device can be manufactured under the polarized window without changing the display brightness according to the vertical or horizontal display direction of the display device.

2. Instead of using a quarter-wave retardation film, the crystal layer can be used to convert the linearly polarized light into circularly polarized or elliptically polarized light. A simple polarizer can be used to reduce the thickness of the screen and reduce the use of expensive polarizers. Through the control of the crystal axial angle and the polarization direction of the linear polarizer, it is possible to manufacture a glass window display which does not change with the vertical or horizontal display direction of the display device due to the change of the display brightness in the polarizing window.

3. The light emitted from the display module of the display device and/or the touch display device is converted into a circularly polarized light or an elliptically polarized light by passing through the polarizing layer having the function of the linear polarizing film and the crystal layer from top to bottom. The use of the crystal layer of the birefringent crystal glass can reduce the number of film layers, thereby reducing the thickness of the display device and/or the touch display device, and reducing the cost, while transmitting the crystal axial angle and the line polarizer. The control of the polarization direction can produce a glass window display of the display device and/or the touch display device that does not change in display brightness depending on the direction in which the display device is placed.

The above are only the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention; all other equivalent changes or modifications which are not departing from the spirit of the present invention should be included in the following patents. Within the scope.

11, 12 ‧ ‧ steps

Claims (13)

A polarization conversion mechanism is applicable to a display device and/or a touch display device environment, and includes: a crystal layer using a birefringent crystal glass, which can change a phase delay effect according to an axial angle of the crystal axis; a polarizing layer having at least one linear polarizing plate, and the light emitted by the display device and/or the display module of the touch display device sequentially passes through the linear polarizing plate of the polarizing layer and the crystal layer And a light emitted from the circularly polarized light or an elliptically polarized light, wherein the crystal layer and the polarizing layer are located in the display device and/or the touch display device, and are located on the display device and/or the touch Control the display device above the display module. The polarization conversion mechanism of claim 1, wherein the crystal layer has a wavelength phase retardation characteristic for linearly polarized light, and the emitted light passing through the crystal layer has a phase retardation of a wavelength. The polarization conversion mechanism of claim 1, wherein the polarizing layer comprises a quarter-wave retarder in addition to the linear polarizer, the linear polarizer is located in the crystal layer and Between the quarter-wave retarder, the output of the display device and/or the touch display device sequentially passes through the quarter-wave retarder, the linear polarizer and the crystal layer, and then converts into a circularly polarized light. Or an elliptically polarized light. The polarized light conversion mechanism according to the first aspect of the patent application, wherein the touch display device is an Out-Cell LCD touch display device, an In-Cell LCD touch display device, an On-Cell LCD touch display device, and -Cell/On-Cell hybrid LCD touch display device, Out-Cell OLED touch display device, On-Cell OLED touch display device, and In-Cell OLED touch display device. The polarization conversion mechanism of claim 1, wherein the crystal layer uses a birefringent crystal glass having a specific axial direction and Δn=n _e -n _o ≠0 as a glass transparent window, and the crystal layer The thickness is a transmission wavelength greater than 100 times. The polarization conversion mechanism of claim 5, wherein the birefringent crystal glass is a sapphire glass layer or a quartz glass layer, and the crystal axial direction of the sapphire glass layer is a C axis, an M axis, an A axis, One of the R axes, the quartz glass uses a C-axis crystal face of a left-handed structure and a right-handed structure. A polarizing conversion method is applicable to a display device and/or a touch display device environment, and includes the following programs: preparing a display device having a display module, and/or a touch display device having a touch/display module; And a polarizing conversion mechanism having a crystal layer and a polarizing layer on the display module of the display device, and/or the touch/display module of the touch display device; wherein the crystal layer is The birefringence crystal glass can be used to change the phase retardation effect according to the axial angle of the crystal axis. The polarizing layer has at least one linear polarizing plate, and the display device and/or the light emitted by the display module of the touch display device The linear polarizing plate of the polarizing layer and the crystal layer are sequentially converted into a circularly polarized light or an elliptically polarized light and emitted. The polarizing conversion method of the seventh aspect of the invention, wherein the crystal layer and the polarizing layer are located in the display device and/or the touch display device, and are located in the display device and/or the touch display device. Above the display module. The polarization conversion method of claim 8, wherein the crystal layer has a phase retardation characteristic for linearly polarized light, and the emitted light passing through the crystal layer has a phase retardation of a wavelength. The polarization conversion method of claim 8, wherein the polarizing layer comprises a quarter-wave retarder in addition to the linear polarizer, the linear polarizer is located in the crystal layer Between the quarter-wave retarder, the output of the display device and/or the touch display device sequentially passes through the quarter-wave retarder, the linear polarizer and the crystal layer, and then converts into a circularly polarized light. Or an elliptically polarized light. The polarized light conversion method of claim 8, wherein the touch display device is an Out-Cell LCD touch display device, an In-Cell LCD touch display device, an On-Cell LCD touch display device, and -Cell/On-Cell hybrid LCD touch display device, Out-Cell OLED touch display device, On-Cell OLED touch display device, and In-Cell OLED touch display device. The polarized light conversion method according to claim 7, wherein the crystal layer uses a birefringent crystal glass having a specific axial direction and Δn=n _e -n _o ≠0 as a glass transparent window, and the crystal layer The thickness is a transmission wavelength greater than 100 times. The polarized light conversion method according to claim 12, wherein the birefringent crystal glass is a sapphire glass layer or a quartz glass layer, and the crystal axial direction of the sapphire glass layer is a C axis, an M axis, and an A axis. One of the R axes, the quartz glass uses a C-axis crystal face of a left-handed structure and a right-handed structure.