TWI887101B - Composite display device - Google Patents

Abstract

According to the present disclosure, a composite display device includes an active display module, a reflective display module and a controlling module. The reflective display module includes a first reflective liquid crystal layer, a first color-changing layer and a second reflective liquid crystal layer. The first reflective liquid crystal layer is arranged between the active display module and the first color-changing layer. The first color-changing layer is arranged between the first reflective liquid crystal layer and the second reflective liquid crystal layer. In the reflective display mode, the controlling module controls the first reflective liquid crystal layer and the second reflective liquid crystal layer to reflect external light and controls the first color-changing layer to change color. In the active display mode, the controlling module controls the active display module to emit a display light and the first color-changing layer to change color. Therefore, optimal display effects can be achieved in different conditions.

Description

Composite display device

The present disclosure relates to a composite display device, and more particularly to a composite display device capable of operating in an active display mode and a reflective display mode.

In order to improve the display effect of the display device in different situations, there is currently a dual-function display device that combines a LED display module with a cholesterol liquid crystal display (ChLCD), which can automatically switch the display mode according to the intensity of the ambient light. When the ambient light is sufficient, the display device will display the content in the form of electronic paper, which reflects the ambient light and does not require a backlight. Therefore, it is still clearly visible outdoors or in strong light, with low power consumption and effective energy saving. When the ambient light is insufficient, the cholesterol liquid crystal electronic paper will switch to the focal conic state and become transparent. At this time, the LED display module is activated, providing a clear picture with its advantages of high color saturation, high brightness and dynamic display.

In conventional dual-function display devices, in order to improve color saturation and reduce color deviation, cholesterol liquid crystal electronic paper is often used with a light-absorbing layer to reduce unnecessary reflected color light. However, the addition of a light-absorbing layer will significantly reduce the brightness of the LED display module and cause color deviation, thereby affecting the display quality. Therefore, how to improve the display effect of cholesterol liquid crystal electronic paper without affecting the brightness and color performance of the LED display module has become the goal of relevant industry players.

The purpose of the present disclosure is to provide a composite display device that can adjust the transmittance of a light absorbing structure, thereby obtaining the best display effect in different states.

An implementation method of the present disclosure provides a composite display device, which includes an active display module, a reflective display module and a control module. The reflective display module includes a first reflective liquid crystal layer, a first color-changing layer and a second reflective liquid crystal layer. The first reflective liquid crystal layer is formed on a surface of the active display module. The first color-changing layer is formed on a surface of the first reflective liquid crystal layer relative to the active display module, and the first reflective liquid crystal layer is located between the active display module and the first color-changing layer. The second reflective liquid crystal layer is formed on a surface of the first color-changing layer relative to the first reflective liquid crystal layer, and the first color-changing layer is located between the first reflective liquid crystal layer and the second reflective liquid crystal layer. The control module is electrically connected to the active display module and the reflective display module, respectively. In a reflective display mode, the control module controls the first reflective liquid crystal layer and the second reflective liquid crystal layer to reflect an external light, thereby forming a first reflected light and a second reflected light, respectively, and the control module controls the first color-changing layer to change color, so that the first color-changing layer absorbs the external light of the same wavelength band as the second reflected light. In an active display mode, the control module controls the active display module to emit a display light and the first color-changing layer to change color, and the display light is transmitted through the reflective display module.

According to the aforementioned composite display device, the reflective display module may further include a second color-changing layer and a third reflective liquid crystal layer. The second color-changing layer may be disposed on a surface of the second reflective liquid crystal layer relative to the first color-changing layer, the second reflective liquid crystal layer may be located between the first color-changing layer and the second color-changing layer, and the second color-changing layer may be electrically connected to the control module. The third reflective liquid crystal layer may be disposed on a surface of the second color-changing layer relative to the second reflective liquid crystal layer, the second color-changing layer may be located between the second reflective liquid crystal layer and the third reflective liquid crystal layer, and the third reflective liquid crystal layer may be electrically connected to the control module. In the reflective display mode, the control module can control the third reflective liquid crystal layer to reflect external light to form a third reflected light, and the control module can control the second color-changing layer to change color so that the second color-changing layer absorbs external light with the same wavelength as the third reflected light. In the active display mode, the control module can control the second color-changing layer to change color so that the display light emitted by the active display module penetrates the third reflective liquid crystal layer and the second color-changing layer.

According to the aforementioned composite display device, the first reflective liquid crystal layer, the second reflective liquid crystal layer and the third reflective liquid crystal layer can be cholesterol liquid crystal layers respectively, and the wavelength bands of the first reflected light, the second reflected light and the third reflected light can be different.

According to the aforementioned composite display device, the first color-changing layer and the second color-changing layer can be respectively an electrochromic layer, which can be selected from the group consisting of polythiophene, polyaniline, polypyrrole, viologen compound and triphenylamine material.

According to the aforementioned composite display device, the wavelength range of the second reflected light may be 480 nm to 620 nm, and the wavelength range of the third reflected light may be 380 nm to 500 nm.

According to the aforementioned composite display device, the wavelength range of the first reflected light may be 560 nm to 780 nm.

According to the aforementioned composite display device, the control module may include a light detection element for detecting an ambient brightness. When the ambient brightness is greater than or equal to a minimum brightness, the control module may control the composite display device to switch to a reflective display mode, and when the ambient brightness is less than the minimum brightness, the control module may control the composite display device to switch to an active display mode.

According to the aforementioned composite display device, the active display module may include a substrate and a plurality of light-emitting elements, and the light-emitting elements may be respectively embedded in the substrate.

According to the aforementioned composite display device, the substrate may be a light absorbing substrate.

According to the aforementioned composite display device, each light-emitting element can be a micro light-emitting diode element, an organic light-emitting diode element or a light-emitting diode element.

Accordingly, the composite display device of the present disclosure introduces a color-changing layer, which can change its optical properties under the action of an electric field, so that the transmittance of the color-changing layer for a specific wavelength band can be adjusted when switching between different modes. Therefore, in the reflective display mode, the color-changing layer can absorb and block unnecessary color light, thereby improving the display saturation of the reflective liquid crystal layer. In the active display mode, the color-changing layer allows the display light to pass through, thereby maximally retaining the brightness and color authenticity of the active display module.

The following will discuss various embodiments of the present disclosure in more detail. However, this embodiment can be an application of various concepts of the disclosure and can be specifically implemented in various specific scopes. The specific embodiments are for illustrative purposes only and are not limited to the scope of the disclosure. In addition, for the sake of simplifying the drawings, some commonly used structures and components will be shown in the drawings in a simple schematic manner, and repeated components may be represented by the same number or similar number.

Please refer to FIG. 1 , which is a cross-sectional view of a composite display device according to an embodiment of the present disclosure. The composite display device 100 includes an active display module 110 , a reflective display module 120 , and a control module 130 .

In detail, the active display module 110 may include a substrate (not numbered) and a plurality of light emitting elements 111, 112, 113, and the light emitting elements 111, 112, 113 may be respectively embedded in the substrate. The substrate may be a light absorbing substrate to absorb light passing through the reflective display module 120 to prevent stray light from affecting the display effect.

Each light-emitting element 111, 112, 113 may be a micro light-emitting diode element, an organic light-emitting diode element, or a light-emitting diode element. Furthermore, the light-emitting elements 111, 112, 113 may each emit light of different colors. For example, the light-emitting elements 111, 112, 113 may be a red light-emitting element, a green light-emitting element, and a blue light-emitting element, respectively. However, the number, color, and position of the light-emitting elements 111, 112, 113 may be adjusted as required, and the present disclosure is not limited thereto.

The reflective display module 120 includes a first reflective liquid crystal layer 121, a first color-changing layer 122, and a second reflective liquid crystal layer 123. The first reflective liquid crystal layer 121 is formed on a surface of the active display module 110. The first color-changing layer 122 is formed on a surface of the first reflective liquid crystal layer 121 opposite to the active display module 110, and the first reflective liquid crystal layer 121 is located between the active display module 110 and the first color-changing layer 122. The second reflective liquid crystal layer 123 is formed on a surface of the first color-changing layer 122 opposite to the first reflective liquid crystal layer 121, and the first color-changing layer 122 is located between the first reflective liquid crystal layer 121 and the second reflective liquid crystal layer 123.

The first reflective liquid crystal layer 121 and the second reflective liquid crystal layer 123 can be respectively a cholesterol liquid crystal layer. By changing the deflection of the liquid crystal molecules in the cholesterol liquid crystal layer, it is possible to control whether the first reflective liquid crystal layer 121 and the second reflective liquid crystal layer 123 reflect light, and the color light bands reflected by the first reflective liquid crystal layer 121 and the second reflective liquid crystal layer 123 can be different, thereby achieving a reflective display effect.

The first color-changing layer 122 may be an electrochromic layer, which may be selected from the group consisting of polythiophene, polyaniline, polypyrrole, viologen compounds and triphenylamine materials, and the color of the first color-changing layer 122 may be changed by controlling the current to achieve the effects of absorbing light or allowing light to pass through.

The control module 130 is electrically connected to the active display module 110 and the reflective display module 120, respectively, and can achieve a reflective display mode or an active display mode by controlling the active display module 110 and the reflective display module 120. The control module 130 may include a light detection element (not shown), which is used to detect an ambient brightness. When the ambient brightness is greater than or equal to a minimum brightness, the control module 130 can control the composite display device 100 to switch to the reflective display mode, and when the ambient brightness is less than the minimum brightness, the control module 130 can control the composite display device 100 to switch to the active display mode, so that the composite display device 100 can actively switch to the best display mode according to the ambient brightness. However, the aforementioned minimum brightness can be adjusted according to the usage scenario, and the present disclosure does not limit it.

In the reflective display mode, the control module 130 controls the first reflective liquid crystal layer 121 and the second reflective liquid crystal layer 123 to reflect an external light, and respectively form a first reflected light and a second reflected light. At this time, the liquid crystal molecules inside the first reflective liquid crystal layer 121 and the second reflective liquid crystal layer 123 will be deflected, thereby achieving the effect of reflecting light and forming a pattern. Furthermore, the control module 130 controls the first color-changing layer 122 to change color, so that the first color-changing layer 122 absorbs the external light with the same wavelength band as the second reflected light. In this way, it is possible to avoid the light that passes through the second reflective liquid crystal layer 123 and has the same wavelength band as the second reflected light, and is reflected by the first reflective liquid crystal layer 121 to affect the display effect. The wavelength range of the first reflected light can be 560 nm to 780 nm, but the content of this disclosure is not limited to the above wavelength range.

In the active display mode, the control module 130 controls the active display module 110 to emit a display light and the first color-changing layer 122 to change color, and the display light is allowed to penetrate the reflective display module 120. Specifically, the control module 130 controls the liquid crystal molecules inside the first reflective liquid crystal layer 121 and the second reflective liquid crystal layer 123 to deflect and control the first color-changing layer 122 to change color, so that the first reflective liquid crystal layer 121 and the second reflective liquid crystal layer 123 do not reflect external light, and the first color-changing layer 122 does not absorb the display light, thereby allowing the display light in the active display mode to pass through the reflective display module 120 to achieve a display effect.

Please refer to FIG. 2, which is a cross-sectional schematic diagram of a composite display device of another embodiment of the present disclosure. The composite display device 200 includes an active display module 210, a reflective display module 220, and a control module 230. The active display module 210 may include light-emitting elements 211, 212, and 213, and the active display module 210 and the control module 230 may have the same or similar structure and configuration as the active display module 110 and the control module 130 of the embodiment of FIG. 1, and will not be described in detail here.

The reflective display module 220 includes a first reflective liquid crystal layer 221, a first color-changing layer 222, a second reflective liquid crystal layer 223, a second color-changing layer 224 and a third reflective liquid crystal layer 225, wherein the first reflective liquid crystal layer 221, the first color-changing layer 222 and the second reflective liquid crystal layer 223 may have the same or similar structure and configuration as the first reflective liquid crystal layer 121, the first color-changing layer 122 and the second reflective liquid crystal layer 123 of the implementation method of FIG. 1, which will not be elaborated here.

The second color-changing layer 224 may be disposed on a surface of the second reflective liquid crystal layer 223 relative to the first color-changing layer 222, the second reflective liquid crystal layer 223 may be located between the first color-changing layer 222 and the second color-changing layer 224, and the second color-changing layer 224 may be electrically connected to the control module 230. The third reflective liquid crystal layer 225 may be disposed on a surface of the second color-changing layer 224 relative to the second reflective liquid crystal layer 223, the second color-changing layer 224 may be located between the second reflective liquid crystal layer 223 and the third reflective liquid crystal layer 225.

The third reflective liquid crystal layer 225 can be electrically connected to the control module 230 and can be a cholesterol liquid crystal layer, whereby the control module 230 can control whether the third reflective liquid crystal layer 225 reflects light, and the color light band reflected by the third reflective liquid crystal layer 225 can be different from that of the first reflective liquid crystal layer 221 and the second reflective liquid crystal layer 223.

The second color-changing layer 224 can be an electrochromic layer, which can be selected from the group consisting of polythiophene, polyaniline, polypyrrole, viologen compounds and triphenylamine materials. It should be particularly noted that the materials of the first color-changing layer 222 and the second color-changing layer 224 can be adjusted according to the light band to be absorbed, and the materials of the first color-changing layer 222 and the second color-changing layer 224 can be the same or different, so the present disclosure is not limited to the above materials.

Please refer to FIG. 3A, which is a cross-sectional schematic diagram of the composite display device of FIG. 2 in the reflective display mode. In the reflective display mode, the control module 230 can control the first reflective liquid crystal layer 221, the second reflective liquid crystal layer 223, and the third reflective liquid crystal layer 225 to reflect the external light L0, thereby forming a first reflected light L1, a second reflected light L2, and a third reflected light L3, and the control module 230 can control the first color-changing layer 222 and the second color-changing layer 224 to change color, so that the first color-changing layer 222 absorbs the external light L0 of the same wavelength band as the second reflected light L2, and the second color-changing layer 224 absorbs the external light L0 of the same wavelength band as the third reflected light L3. In this way, in addition to preventing the light having the same wavelength as the second reflected light L2 that passes through the second reflective liquid crystal layer 223 from being reflected by the first reflective liquid crystal layer 221 as mentioned above, the light having the same wavelength as the third reflected light L3 that passes through the third reflective liquid crystal layer 225 is also prevented from being reflected by the second reflective liquid crystal layer 223 and affecting the display effect.

For example, if the light reflected by the third reflective liquid crystal layer 225 is blue light, the second color-changing layer 224 may change color to yellow, thereby absorbing the blue light passing through the third reflective liquid crystal layer 225. In other words, the light reflected by the third reflective liquid crystal layer 225 and the color of the second color-changing layer 224 may be complementary, and the light reflected by the second reflective liquid crystal layer 223 and the color of the first color-changing layer 222 may be complementary.

The wavelengths of the first reflected light L1, the second reflected light L2, and the third reflected light L3 may be different. The wavelength range of the first reflected light L1 may be 560 nm to 780 nm, the wavelength range of the second reflected light L2 may be 480 nm to 620 nm, and the wavelength range of the third reflected light L3 may be 380 nm to 500 nm, and the materials of the first color-changing layer 222 and the second color-changing layer 224 may be adjusted according to the wavelength ranges of the second reflected light L2 and the third reflected light L3 to achieve a good absorption effect.

In addition to the above wavelength range, the wavelength range of the second reflected light L2 can be 520 nm to 640 nm, and the wavelength range of the third reflected light L3 can be 460 nm to 550 nm. Thus, the wavelength range of the reflected light can be adjusted according to the needs to achieve different display effects.

Please refer to FIG. 3B , which is a cross-sectional schematic diagram of the composite display device of FIG. 2 in the active display mode. In the active display mode, the control module 230 can control the first color-changing layer 222 and the second color-changing layer 224 to change color, so that the display light LE emitted by the active display module 210 penetrates the reflective display module 220 . In detail, the control module 230 controls the deflection of the liquid crystal molecules inside the first reflective liquid crystal layer 221, the second reflective liquid crystal layer 223 and the third reflective liquid crystal layer 225 and controls the color change of the first color-changing layer 222 and the second color-changing layer 224, so that the first reflective liquid crystal layer 221, the second reflective liquid crystal layer 223 and the third reflective liquid crystal layer 225 do not reflect external light, and the first color-changing layer 222 and the second color-changing layer 224 do not absorb the display light LE, thereby allowing the display light LE to pass through the reflective display module 220 to achieve a display effect.

In summary, the composite display device of the present disclosure introduces a color-changing layer, which can change its optical properties under the action of an electric field, so that the transmittance of the color-changing layer for a specific wavelength band can be adjusted when switching between different modes. Therefore, in the reflective display mode, the color-changing layer can absorb and block unnecessary color light, improve the display saturation of the reflective liquid crystal layer, and reduce color deviation. In the active display mode, the color-changing layer allows the display light to pass through, thereby maximally retaining the brightness and color authenticity of the active display module.

Although the contents of this disclosure have been disclosed as above by way of embodiments, they are not intended to limit the contents of this disclosure. Anyone skilled in the art can make various changes and modifications without departing from the spirit and scope of the contents of this disclosure. Therefore, the protection scope of the contents of this disclosure shall be subject to the scope defined by the attached patent application.

100,200: composite display device 110,210: active display module 111,112,113,211,212,213: light-emitting element 120,220: reflective display module 121,221: first reflective liquid crystal layer 122,222: first color-changing layer 123,223: second reflective liquid crystal layer 130,230: control module 224: second color-changing layer 225: third reflective liquid crystal layer L0: external light L1: first reflected light L2: second reflected light L3: third reflected light LE: display light

FIG. 1 is a schematic cross-sectional view of a composite display device of one embodiment of the present disclosure; FIG. 2 is a schematic cross-sectional view of a composite display device of another embodiment of the present disclosure; FIG. 3A is a schematic cross-sectional view of the composite display device of FIG. 2 in a reflective display mode; and FIG. 3B is a schematic cross-sectional view of the composite display device of FIG. 2 in an active display mode.

100: Composite display device

110: Active display module

111,112,113: Light-emitting element

120: Reflective display module

121: first reflective liquid crystal layer

122: First color changing layer

123: Second reflective liquid crystal layer

130: Control module

Claims (10)

A composite display device comprises: an active display module; a reflective display module comprising: a first reflective liquid crystal layer formed on a surface of the active display module; a first color-changing layer formed on a surface of the first reflective liquid crystal layer relative to the active display module, and the first reflective liquid crystal layer is located between the active display module and the first color-changing layer; and a second reflective liquid crystal layer formed on a surface of the first color-changing layer relative to the first reflective liquid crystal layer, and the first color-changing layer is located between the first reflective liquid crystal layer and the second reflective liquid crystal layer; and a control module electrically connected to the active display module and the reflective display module respectively; Wherein, in a reflective display mode, the control module controls the first reflective liquid crystal layer and the second reflective liquid crystal layer to reflect an external light, thereby forming a first reflected light and a second reflected light respectively, and the control module controls the first color-changing layer to change color, so that the first color-changing layer absorbs the external light of the same wavelength band as the second reflected light; Wherein, in an active display mode, the control module controls the active display module to emit a display light and the first color-changing layer to change color, and the display light penetrates the reflective display module. The composite display device as described in claim 1, wherein the reflective display module further comprises: a second color-changing layer, disposed on a surface of the second reflective liquid crystal layer relative to the first color-changing layer, the second reflective liquid crystal layer is located between the first color-changing layer and the second color-changing layer, and the second color-changing layer is electrically connected to the control module; and a third reflective liquid crystal layer, disposed on a surface of the second color-changing layer relative to the second reflective liquid crystal layer, the second color-changing layer is located between the second reflective liquid crystal layer and the third reflective liquid crystal layer, and the third reflective liquid crystal layer is electrically connected to the control module; Wherein, in the reflective display mode, the control module controls the third reflective liquid crystal layer to reflect the external light to form a third reflected light, and the control module controls the second color-changing layer to change color, so that the second color-changing layer absorbs the external light with the same wavelength as the third reflected light; Wherein, in the active display mode, the control module controls the second color-changing layer to change color, so that the display light emitted by the active display module penetrates the third reflective liquid crystal layer and the second color-changing layer. The composite display device as described in claim 2, wherein the first reflective liquid crystal layer, the second reflective liquid crystal layer and the third reflective liquid crystal layer are respectively cholesterol liquid crystal layers, and the first reflected light, the second reflected light and the third reflected light have different wavelength bands. In the composite display device as described in claim 2, the first color-changing layer and the second color-changing layer are respectively an electrochromic layer selected from the group consisting of polythiophene, polyaniline, polypyrrole, viologen compounds and triphenylamine materials. A composite display device as described in claim 2, wherein the wavelength range of the second reflected light is 480 nm to 620 nm, and the wavelength range of the third reflected light is 380 nm to 500 nm. A composite display device as described in claim 1, wherein the wavelength range of the first reflected light is 560 nm to 780 nm. A composite display device as described in claim 1, wherein the control module includes a light detection element, and the light detection element is used to detect an ambient brightness; wherein, when the ambient brightness is greater than or equal to a minimum brightness, the control module controls the composite display device to switch to the reflective display mode, and when the ambient brightness is less than the minimum brightness, the control module controls the composite display device to switch to the active display mode. In the composite display device as described in claim 1, the active display module comprises a substrate and a plurality of light-emitting elements, and the light-emitting elements are respectively embedded in the substrate. A composite display device as described in claim 8, wherein the substrate is a light absorbing substrate. In the composite display device as described in claim 8, each of the light-emitting elements is a micro light-emitting diode element, an organic light-emitting diode element or a light-emitting diode element.

Images