TWI818565B - Reflective display - Google Patents

Abstract

A reflective display includes a first substrate, a second substrate, a third substrate, a fourth substrate, a plurality of first driving electrodes, a plurality of second driving electrodes, a plurality of third driving electrodes, a plurality of fourth driving electrodes, a first liquid crystal layer and a second liquid crystal layer. The optical density of the first substrate is greater than or equal to 0.5. The first driving electrodes and the second driving electrodes cross, and the first liquid crystal layer, the first driving electrodes and the second driving electrodes are located between the first substrate and the second substrate. The third substrate is disposed on the second substrate. The third driving electrodes and the fourth driving electrodes cross, and the second liquid crystal layer, the third driving electrodes and the fourth driving electrodes are located between the third substrate and the fourth substrate.

Description

reflective display

The present invention relates to a display, and in particular to a reflective display.

Current display technology has developed reflective cholesteric liquid crystal displays, which include cholesteric liquid crystals whose molecular arrangements have two stable states: focal conic state and planar state. Therefore, cholesteric liquid crystal has bistable characteristics, and cholesteric liquid crystal does not require additional energy from the outside world to maintain the original arrangement of liquid crystal molecules (i.e., focal conic arrangement or planar arrangement).

When a voltage is applied to the cholesterol liquid crystal, the voltage can generate an electric field in the cholesterol liquid crystal to control the molecular arrangement state of the cholesterol liquid crystal to switch between the two stable states of the focal conic arrangement state and the planar arrangement state. Cholesterol liquid crystals in a planar arrangement can reflect light of specific wavelengths according to Bragg’s Law, so that reflective cholesteric liquid crystal displays can display images.

On the contrary, the cholesteric liquid crystal in the focal conic arrangement state can basically allow light to completely penetrate, that is, the cholesteric liquid crystal in the focal conic arrangement state appears transparent. However, the transparent cholesteric liquid crystal may cause the contrast ratio of the reflective cholesteric liquid crystal display to decrease, thus reducing the image quality.

At least one embodiment of the present invention provides a reflective display to improve contrast.

The reflective display provided by at least one embodiment of the present invention includes a first substrate, a second substrate, a third substrate, a fourth substrate, a plurality of first driving electrodes, a plurality of second driving electrodes, a plurality of third driving electrodes, A plurality of fourth driving electrodes, a first liquid crystal layer and a second liquid crystal layer. The optical density of the first substrate is greater than or equal to 0.5. The first driving electrodes are disposed on the first substrate and extend toward the first direction, wherein the first driving electrodes are arranged along the second direction, and the first direction and the second direction are staggered. The second driving electrodes are disposed on the second substrate and extend toward the second direction, wherein the second driving electrodes are arranged along the first direction. The first driving electrodes and the second driving electrodes are staggered and overlapped, and the first driving electrodes and the second driving electrodes are located between the first substrate and the second substrate. The first liquid crystal layer is disposed between the first driving electrodes and the second driving electrodes. The third substrate is disposed on the second substrate. These third driving electrodes are disposed on the third substrate and extend toward a third direction, where the third direction intersects with the first direction. The third substrate is located between the fourth substrate and the second substrate. These fourth driving electrodes are disposed on the fourth substrate and extend in a fourth direction, where the fourth direction intersects with the second direction. The third driving electrodes and the fourth driving electrodes are staggered and overlapped, and the third driving electrodes and the fourth driving electrodes are located between the third substrate and the fourth substrate. The second liquid crystal layer is disposed between the third driving electrodes and the fourth driving electrodes.

In at least one embodiment of the present invention, the first substrate is a black substrate.

In at least one embodiment of the present invention, the first substrate includes a support plate and a black light-absorbing layer. The support plate has a bearing surface, and the black light-absorbing layer is disposed on the bearing surface and is located between the first driving electrodes and the support plate, where the black light-absorbing layer completely covers the bearing surface.

In at least one embodiment of the present invention, the first driving electrodes are opaque, and each first driving electrode has a light-absorbing surface, wherein the light-absorbing surface faces the first liquid crystal layer.

In at least one embodiment of the present invention, each first driving electrode includes a metal layer and a light-absorbing film, wherein the light-absorbing film is disposed on the metal layer and has a light-absorbing surface.

In at least one embodiment of the present invention, the above-mentioned reflective display further includes a first light-shielding layer and a plurality of first spacers. The first light-shielding layer is disposed on the fourth substrate and is located between the fourth substrate and the fourth driving electrodes. These first spacers are disposed between the first substrate and the second substrate, where there is a gap between two adjacent first driving electrodes, and at least one of the first spacers is disposed in the gap.

In at least one embodiment of the present invention, the first light-shielding layer covers at least one of the first spacers.

In at least one embodiment of the present invention, the above-mentioned reflective display further includes a plurality of second spacers. The second spacers are disposed between the third substrate and the fourth substrate, wherein the first light-shielding layer covers at least one of the second spacers.

In at least one embodiment of the present invention, the above-mentioned reflective display further includes a fifth substrate, a sixth substrate, a plurality of fifth driving electrodes, a plurality of sixth driving electrodes, a third liquid crystal layer and a second light-shielding layer. The fifth substrate is disposed on the fourth substrate. These fifth driving electrodes are disposed on the fifth substrate and extend in a fifth direction, where the fifth direction intersects with the first direction. The fifth substrate is located between the fourth substrate and the sixth substrate. These sixth driving electrodes are disposed on the sixth substrate and extend in a sixth direction, where the sixth direction intersects with the second direction. The sixth driving electrodes and the fifth driving electrodes are staggered and overlapped, and the fifth driving electrodes and the sixth driving electrodes are located between the fifth substrate and the sixth substrate. The third liquid crystal layer is disposed between the fifth driving electrodes and the sixth driving electrodes. The second light-shielding layer is disposed on the sixth substrate and is located between the sixth substrate and the sixth driving electrodes, wherein the second light-shielding layer covers at least one of the first spacers.

In at least one embodiment of the present invention, the shapes of the first light-shielding layer and the second light-shielding layer are different from each other.

The reflective display provided by at least one embodiment of the present invention includes a first substrate, a second substrate, a third substrate, a fourth substrate, a plurality of first driving electrodes, a plurality of second driving electrodes, a plurality of third driving electrodes, A plurality of fourth driving electrodes, a first liquid crystal layer and a second liquid crystal layer. The first driving electrodes are disposed on the first substrate and extend toward the first direction, wherein the first driving electrodes are arranged along the second direction, and the first direction and the second direction are staggered. The second driving electrodes are disposed on the second substrate and extend toward the second direction, wherein the second driving electrodes are arranged along the first direction. The first driving electrodes and the second driving electrodes are staggered and overlapped, and the first driving electrodes and the second driving electrodes are located between the first substrate and the second substrate. The first liquid crystal layer is disposed between the first driving electrodes and the second driving electrodes. The third substrate is disposed on the second substrate. These third driving electrodes are disposed on the third substrate and extend toward a third direction, where the third direction intersects with the first direction. The third substrate is located between the fourth substrate and the second substrate. These fourth driving electrodes are disposed on the fourth substrate and extend in a fourth direction, where the fourth direction intersects with the second direction. The third driving electrodes and the fourth driving electrodes are staggered and overlapped, and the third driving electrodes and the fourth driving electrodes are located between the third substrate and the fourth substrate. The second liquid crystal layer is disposed between the third driving electrodes and the fourth driving electrodes.

In at least one embodiment of the present invention, the first substrate is a black substrate.

In at least one embodiment of the present invention, the first substrate includes a support plate and a black light-absorbing layer. The support plate has a bearing surface, and the black light-absorbing layer is disposed on the bearing surface and is located between the first driving electrodes and the support plate, where the black light-absorbing layer completely covers the bearing surface.

In at least one embodiment of the present invention, the first driving electrodes are opaque, and each first driving electrode has a light-absorbing surface, wherein the light-absorbing surface faces the first liquid crystal layer, and the first substrate and the first driving electrodes generate optical density, Where this optical density is greater than or equal to 0.5.

In at least one embodiment of the present invention, each first driving electrode includes a metal layer and a light-absorbing film. The light-absorbing film is arranged on the metal layer and has a light-absorbing surface.

Based on the above, the first substrate can effectively absorb light. Therefore, when all the liquid crystal layers (such as the first liquid crystal layer and the second liquid crystal layer) are in a focal cone arrangement state, the first substrate can effectively absorb the light penetrating the liquid crystal layer to improve the contrast of the reflective display.

In the following text, in order to clearly present the technical features of this case, the dimensions (such as length, width, thickness and depth) of the components (such as layers, films, substrates, regions, etc.) in the drawings will be exaggerated in varying proportions. , and the number of some components will be reduced. Therefore, the description and explanation of the embodiments below are not limited to the number of components and the sizes and shapes of the components in the drawings, but should cover the size, shape, and deviations in both caused by actual manufacturing processes and/or tolerances. For example, flat surfaces shown in the drawings may have rough and/or non-linear features, while acute angles shown in the drawings may be rounded. Therefore, the components shown in the drawings of this case are mainly for illustration and are not intended to accurately depict the actual shapes of the components, nor are they intended to limit the patent scope of this case.

Secondly, the words "about", "approximately" or "substantially" appearing in the content of this case not only cover the clearly stated numerical values and numerical ranges, but also cover what can be understood by a person with ordinary knowledge in the technical field to which the invention belongs. The allowable deviation range, where the deviation range can be determined by the error generated during measurement, and this error is caused, for example, by limitations of the measurement system or process conditions. For example, two objects (such as the plane or traces of a substrate) are "substantially parallel" or "substantially perpendicular", where "substantially parallel" and "substantially perpendicular" respectively represent the parallelism and perpendicularity between the two objects. It can include non-parallelism and non-perpendicularity caused by the allowable deviation range.

In addition, "about" may mean within one or more standard deviations of the above numerical value, such as within ±30%, ±20%, ±10%, or ±5%. Words such as "approximately", "approximately" or "substantially" appearing in this text can be used to select acceptable deviation ranges or standard deviations based on optical properties, etching properties, mechanical properties or other properties, and are not solely based on one The standard deviation applies to all the above optical properties, etching properties, mechanical properties and other properties.

FIG. 1A is a schematic cross-sectional view of a reflective display according to at least one embodiment of the present invention. Referring to FIG. 1A , the reflective display 100 includes a first substrate 110 , a second substrate 120 , a plurality of first driving electrodes 171 , a plurality of second driving electrodes 172 and a first liquid crystal layer LC1 . The first driving electrodes 171 are disposed on the first substrate 110, and the second driving electrodes 172 are disposed on the second substrate 120, wherein the first driving electrodes 171, the second driving electrodes 172 and the first liquid crystal layer LC1 are all Located between the first substrate 110 and the second substrate 120 .

The first driving electrode 171 and the second driving electrode 172 are both transparent conductive layers, which can be made of transparent conductive oxide (TCO), such as indium tin oxide (Indium Tin Oxide, ITO) or indium zinc oxide (Indium Zinc Oxide). -doped Zinc Oxide, IZO). The first liquid crystal layer LC1 is cholesteric liquid crystal and is disposed between the first driving electrodes 171 and the second driving electrodes 172 .

When the first driving electrode 171 and the second driving electrode 172 are energized, the first driving electrode 171 and the second driving electrode 172 can apply voltage to the first liquid crystal layer LC1 to generate an electric field in the first liquid crystal layer LC1, thereby controlling the first liquid crystal layer LC1. The molecular arrangement state of a liquid crystal layer LC1 switches between two stable states: the focal conic arrangement state and the planar arrangement state. When the first liquid crystal layer LC1 is in a planar arrangement state, the first liquid crystal layer LC1 can reflect light of a specific wavelength according to Bragg's law, which is, for example, one of red light, green light, blue light and yellow light.

The reflective display 100 further includes a third substrate 130, a fourth substrate 140, a plurality of third driving electrodes 173, a plurality of fourth driving electrodes 174, and a second liquid crystal layer LC2. The third substrate 130 is disposed on the second substrate 120 , and the fourth substrate 140 is disposed on the third substrate 130 , wherein the third substrate 130 is located between the fourth substrate 140 and the second substrate 120 . The third driving electrodes 173 are disposed on the third substrate 130, and the fourth driving electrodes 174 are disposed on the fourth substrate 140, wherein the third driving electrodes 173, the fourth driving electrodes 174 and the second liquid crystal layer LC2 are all Located between the third substrate 130 and the fourth substrate 140 .

Both the third driving electrode 173 and the fourth driving electrode 174 are transparent conductive layers, which can be made of transparent oxide (TCO), such as indium tin oxide (ITO) or indium zinc oxide (IZO). The second liquid crystal layer LC2 is cholesteric liquid crystal and is disposed between the third driving electrodes 173 and the fourth driving electrodes 174 so that the third driving electrodes 173 and the fourth driving electrodes 174 can apply voltage to the second liquid crystal layer LC2 .

When the third driving electrode 173 and the fourth driving electrode 174 apply voltage to the second liquid crystal layer LC2, the third driving electrode 173 and the fourth driving electrode 174 can control the molecular arrangement state of the second liquid crystal layer LC2 to be in the focal conic arrangement state and Planar arrangement state transition between two stable states. When the second liquid crystal layer LC2 is in a planar arrangement state, the second liquid crystal layer LC2 can reflect light of a specific wavelength according to Bragg's law, which is, for example, one of red light, green light, blue light and yellow light.

In this embodiment, when the first liquid crystal layer LC1 and the second liquid crystal layer LC2 are both in a planar arrangement state, the light reflected by the first liquid crystal layer LC1 and the second liquid crystal layer LC2 respectively have two different colors. For example, the first liquid crystal layer LC1 in the planar arrangement state reflects yellow light, and the second liquid crystal layer LC2 in the planar arrangement state reflects blue light. In this way, the first liquid crystal layer LC1 and the second liquid crystal layer LC2 can respectively reflect different colors of light (eg, blue light and yellow light), so that the reflective display 100 can display images.

FIG. 1B is a schematic top view of the first driving electrode and the second driving electrode in FIG. 1A . Referring to FIG. 1B , each first driving electrode 171 and each second driving electrode 172 are both in strip shape, wherein the first driving electrodes 171 are parallel to each other, and the second driving electrodes 172 are parallel to each other. Therefore, a gap 171g exists between two adjacent first driving electrodes 171, and a gap 172g exists between two adjacent second driving electrodes 172.

In the embodiment shown in FIG. 1B , the first driving electrodes 171 may extend toward the first direction D1 and be arranged along the second direction D2 , and the second driving electrodes 172 may extend toward the second direction D2 and be arranged along the second direction D2 . arranged in the first direction D1. The first direction D1 and the second direction D2 intersect, that is, the first direction D1 and the second direction D2 are different from each other. For example, the first direction D1 and the second direction D2 may be substantially perpendicular to each other, as shown in FIG. 1B . Since the first direction D1 and the second direction D2 intersect, the first driving electrodes 171 and the second driving electrodes 172 will intersect and overlap to form multiple overlapping areas P1, where only one overlapping area P1 is marked in FIG. 1B. And the overlapping area P1 is expressed as a dot matrix area.

Referring to FIGS. 1A and 1B , when the first driving electrode 171 and the second driving electrode 172 are powered on, the first driving electrode 171 and the second driving electrode 172 will apply a voltage to the first liquid crystal layer LC1 to cause the first driving electrode to An electric field is generated in these overlapping areas P1 (for example, the lattice area shown in FIG. 1B ) between 171 and the second driving electrode 172 . This electric field can change the arrangement of liquid crystal molecules in the first liquid crystal layer LC1, so that the first liquid crystal layer LC1 can be in a planar arrangement state and can reflect light of a specific wavelength (such as yellow light), where the overlapping area P1 is basically equivalent to a reflective The single-color pixels of the display 100 are sub-pixels.

FIG. 1C is a schematic top view of the third driving electrode and the fourth driving electrode in FIG. 1A . Referring to FIG. 1A and FIG. 1C , similar to the shapes of the first driving electrode 171 and the second driving electrode 172 , the shapes of each third driving electrode 173 and each fourth driving electrode 174 are also strip-shaped, where The third driving electrodes 173 are parallel to each other, and the fourth driving electrodes 174 are parallel to each other. Therefore, a gap 173g exists between two adjacent third driving electrodes 173, and a gap 174g exists between two adjacent fourth driving electrodes 174.

The third driving electrodes 173 extend toward the third direction D3 and may be arranged along the fourth direction D4, and the fourth driving electrodes 174 extend toward the fourth direction D4 and may be arranged along the third direction D3, where the third The direction D3 intersects with the fourth direction D4, that is, the third direction D3 is different from the fourth direction D4. Taking FIG. 1C as an example, the third direction D3 and the fourth direction D4 may be substantially perpendicular to each other. Therefore, the third driving electrodes 173 and the fourth driving electrodes 174 are staggered and overlapped, as shown in FIG. 1C . Therefore, the third driving electrodes 173 and the fourth driving electrodes 174 can form multiple overlapping regions P2. In addition, FIG. 1C only indicates one overlapping area P2, which is represented by a dot matrix area.

Referring to FIG. 1B and FIG. 1C , the third direction D3 intersects with the first direction D1 , and the fourth direction D4 intersects with the second direction D2 . In other words, the third direction D3 is different from the first direction D1, and the fourth direction D4 is different from the second direction D2. Furthermore, in this embodiment, the third direction D3 may be parallel to the second direction D2, and the fourth direction D4 may be parallel to the first direction D1. That is to say, the third direction D3 may be the same as the second direction D2, and the fourth direction D4 may be the same as the first direction D1, as shown in FIG. 1B and FIG. 1C.

However, in other embodiments, the third direction D3 may not be parallel or perpendicular to the second direction D2, and the fourth direction D4 may not be parallel or perpendicular to the first direction D1. Therefore, the extending direction of any one of the third driving electrode 173 and the fourth driving electrode 174 (ie, the third direction D3 or the fourth direction D4) may not be parallel, nor perpendicular to any of the first direction D1 or the second direction D2. One. Therefore, any one of the third driving electrode 173 and the fourth driving electrode 174 may be neither parallel nor perpendicular to any one of the first driving electrode 171 and the second driving electrode 172 . Therefore, FIG. 1B and FIG. 1C do not limit the extending direction of the third driving electrode 173 (ie, the third direction D3) and the extending direction of the fourth driving electrode 174 (ie, the fourth direction D4).

Referring to FIGS. 1A and 1C , when the third driving electrode 173 and the fourth driving electrode 174 are energized, an electric field will be generated in the overlapping areas P2 between the third driving electrode 173 and the fourth driving electrode 174 , so that the third driving electrode 173 and the fourth driving electrode 174 are electrically connected. The second liquid crystal layer LC2 can be in a focal conic arrangement state or a planar arrangement state. In this way, the second liquid crystal layer LC2 in a planar arrangement can reflect light of a specific wavelength (eg, blue light), and the overlapping area P2 is basically equivalent to a single-color pixel, that is, a sub-pixel of the reflective display 100 .

Referring to FIG. 1A , the optical density of the first substrate 110 is greater than or equal to 0.5. For example, the optical density may be 0.6 or greater than or equal to 1. The optical density here can also be called absorbance, and the optical density is defined as the following mathematical formula (1). ……………………………… Mathematical formula (1)

Optical density OD uses light to measure. During the process of measuring the optical density OD, light will penetrate the object to be measured, such as the first substrate 110 . The above-mentioned light is visible light, so the wavelength of the light can be approximately between 380 nanometers and 780 nanometers. In the above mathematical formula (1), Io is the intensity of the light before penetrating the object to be measured (for example, the first substrate 110), and It is the intensity of the light after penetrating the object to be measured. It can be seen that during the process of light penetrating the object to be measured, Io is the intensity of the incident light, and It is the intensity of the outgoing light after penetrating the object to be measured. Therefore, the above mathematical formula (1) can be rewritten into the following mathematical formula (2), where T in mathematical formula (2) is the transmittance (transmittance, which can also be called light transmittance). ……………… Mathematical formula (2)

According to the optical density defined by the above mathematical formulas (1) and (2), since the optical density of the first substrate 110 is greater than or equal to 0.5, the first substrate 110 can effectively absorb light. When the first liquid crystal layer LC1 and the second liquid crystal layer LC2 are in a focal cone arrangement state, the first substrate 110 can effectively absorb the light penetrating the first liquid crystal layer LC1 and the second liquid crystal layer LC2, thereby improving the contrast, thereby improving the reflective Image quality of display 100.

In the embodiment shown in FIG. 1A , the first substrate 110 may include a support plate 111 and a black light-absorbing layer 112 , where the support plate 111 has a bearing surface 111s, and the black light-absorbing layer 112 is disposed on the bearing surface 111s and located on these third Between a driving electrode 171 and the support plate 111, the black light-absorbing layer 112 completely covers the bearing surface 111s. The black light-absorbing layer 112 is an opaque film layer and may contain a black dye, such as carbon black, so that the black light-absorbing layer 112 can absorb light. In addition, the optical density of the black light-absorbing layer 112 may be greater than or equal to 1.0.

The support plate 111 may be a transparent substrate, such as a glass plate, a sapphire substrate or a transparent plastic substrate. When the support plate 111 is a transparent substrate, although light can penetrate the support plate 111, since the black light-absorbing layer 112 can absorb the light, the optical density of the entire first substrate 110 is still greater than or equal to 0.5, so that the first substrate 110 can The light penetrating the first liquid crystal layer LC1 and the second liquid crystal layer LC2 is effectively absorbed, thereby improving the contrast. In addition, the second substrate 120 , the third substrate 130 and the fourth substrate 140 may be made of the same material as the support plate 111 , that is, the second substrate 120 , the third substrate 130 and the fourth substrate 140 may also be transparent substrates. For example, glass plate, sapphire substrate or transparent plastic substrate.

In the embodiment shown in FIG. 1A , the first substrate 110 may further include a protective layer 113 . The protective layer 113 is disposed on the black light-absorbing layer 112, and the black light-absorbing layer 112 is located between the protective layer 113 and the supporting plate 111. The black light-absorbing layer 112 and the protective layer 113 are both located between the first driving electrodes 171 and the supporting plate 111. . The protective layer 113 is an insulating layer and may be made of inorganic materials. For example, the protective layer 113 may be made of silicon oxide or silicon nitride. During the manufacturing process of the first substrate 110, the protective layer 113 can protect the black light-absorbing layer 112 to prevent the black light-absorbing layer 112 from being damaged during processes such as etching or development, thereby improving yield.

The reflective display 100 may further include a first optical glue A12, where the first optical glue A12 is disposed between the second substrate 120 and the third substrate 130, and is adhered to the second substrate 120 and the third substrate 130. In one embodiment, the first optical glue A12 may be a transparent and colorless glue layer, that is, the first optical glue A12 is transparent. Therefore, when light penetrates the first optical glue A12, the first optical glue A12 basically does not change the color of the light.

However, in other embodiments, the first optical glue A12 may have a light filtering function. Specifically, the first optical glue A12 may contain at least one dye. Using this dye, the first optical glue A12 can filter out light of specific wavelengths to enhance the image color of the reflective display 100 . For example, when the second liquid crystal layer LC2 can reflect blue light and the first liquid crystal layer LC1 can reflect yellow light, the first optical glue A12 can absorb blue light so that the light incident on the first liquid crystal layer LC1 basically does not contain blue light, thereby improving the Image color. The wavelength of the above-mentioned blue light can be between 380 nanometers and 500 nanometers, such as 450 nanometers, so the first optical glue A12 can filter out the light with a wavelength between 380 nanometers and 500 nanometers, among which the yellow light can Penetrate the first optical glue A12.

FIG. 1D is a schematic top view of the first light-shielding layer in FIG. 1A. Referring to FIGS. 1A and 1D , the reflective display 100 further includes a first light-shielding layer 142 . The first light-shielding layer 142 is disposed on the fourth substrate 140 and is located between the fourth substrate 140 and the fourth driving electrodes 174 . The reflective display 100 may further include a protective layer 143, wherein the protective layer 143 is disposed on the fourth substrate 140 and the first light-shielding layer 142, and the first light-shielding layer 142 and the protective layer 143 are located on the fourth driving electrodes 174 and the fourth substrate. between 140. The protective layers 113 and 143 may be made of the same material, and the protective layer 143 can protect the first light-shielding layer 142 from being damaged during processes such as etching or development to improve yield.

Referring to FIG. 1B, FIG. 1C, and FIG. 1D, the first light-shielding layer 142 includes a first light-shielding frame 142f and a first light-shielding pattern 142p, wherein the first light-shielding pattern 142p is located in the first light-shielding frame 142f. That is to say, the first light-shielding frame 142f surrounds the first light-shielding pattern 142p. The shape of the first light-shielding pattern 142p may be a mesh, and the first light-shielding pattern 142p has a plurality of openings 142h, wherein the openings 142h may be arranged in an array and are respectively aligned with the overlapping areas P1 and P2.

In other words, the first light shielding pattern 142p will not basically block the overlapping areas P1 and P2, but will block areas outside the overlapping areas P1 and P2, such as the gaps 171g, 172g, 173g and 173g shown in FIGS. 1B and 1C. 174g. It can be seen that light can pass through these openings 142h, but parts of the first light-shielding layer 142 other than these openings 142h will block the light. In this way, the first light-shielding layer 142 can help prevent light leakage to improve the contrast of the reflective display 100 .

Since the first light shielding pattern 142p basically does not block the overlapping areas P1 and P2, external light can be incident on the first liquid crystal layer LC1 in the overlapping areas P1 and the second liquid crystal layer in the overlapping areas P2 from the openings 142h. LC2. In this way, the first liquid crystal layer LC1 in the planar arrangement state can reflect light of a specific wavelength (eg, yellow light) from the overlapping area P1, and the first liquid crystal layer LC1 in the focal cone arrangement state can allow light to penetrate. Similarly, the second liquid crystal layer LC2 in a planar arrangement can reflect light of a specific wavelength (such as blue light) from the overlapping area P2, while the second liquid crystal layer LC2 in a focal cone arrangement can allow light to penetrate.

Referring to FIG. 1A and FIG. 1B , the reflective display 100 further includes a plurality of first spacers 181 and a plurality of second spacers 182 , wherein the first spacers 181 and the second spacers 182 may be made of photoresist. . The first spacers 181 are disposed between the first substrate 110 and the second substrate 120, and at least one of the first spacers 181 is disposed in the gap 171g. For example, in this embodiment, each first spacer 181 may be located on two adjacent first driving electrodes 171 and extend into the gap 171g between the two first driving electrodes 171.

Referring to FIGS. 1A and 1C , the second spacers 182 are disposed between the third substrate 130 and the fourth substrate 140 , and at least one of the second spacers 182 is disposed in the gap 174g. For example, in this embodiment, each second spacer 182 may be located on two adjacent fourth driving electrodes 174 and extend into the gap 174g between the two fourth driving electrodes 174 . The first light-shielding layer 142 can cover at least one of the first spacers 181 and at least one of the second spacers 182 . For example, in this embodiment, the first light-shielding layer 142 can cover all the first spacers 181 and all the second spacers 182 to weaken or eliminate the light leakage caused by both the first spacers 181 and the second spacers 182 .

It is particularly mentioned that in other embodiments, the first spacers 181 can respectively extend along the gaps 171g and be distributed in the gaps 171g, and the second spacers 182 can respectively extend along the gaps 174g and be distributed. 174g for these gaps. Therefore, at least one first spacer 181 may be distributed in at least one gap 172g, and at least one second spacer 182 may be distributed in at least one gap 173g.

The reflective display 100 may further include two sealants S12 and S34. The sealant S12 is located between the first substrate 110 and the second substrate 120 and is adhered to the first substrate 110 and the second substrate 120 . The sealant S12 surrounds the first liquid crystal layer LC1 so that the first substrate 110 and the second substrate 120 and the sealant S12 can seal the first liquid crystal layer LC1. Similarly, the sealant S34 is located between the third substrate 130 and the fourth substrate 140 and is adhered to the third substrate 130 and the fourth substrate 140 , wherein the sealant S34 surrounds the second liquid crystal layer LC2 so that the third substrate 130, The fourth substrate 140 and the sealant S34 can seal the second liquid crystal layer LC2.

The reflective display 100 may also include two electrical connectors 191 and 193 and two driving elements 192 and 194. The driving components 192 and 194 may be chips, and the electrical connectors 191 and 193 may be circuit boards, such as flexible printed circuits (FPC). The driving element 192 is mounted on the electrical connector 191, and the driving element 194 is mounted on the electrical connector 193. The driving elements 192 and 194 can be used with Anisotropic Conductive Film (ACF) or flip chip. Chip on Film (COF) is installed on the electrical connectors 191 and 193 respectively, so that the driving elements 192 and 194 are electrically connected to the electrical connectors 191 and 193 respectively.

These driving elements 192 and 194 can be electrically connected to the first driving electrode 171, the second driving electrode 172, the third driving electrode 173 and the fourth driving electrode 174 via the electrical connectors 191 and 193 respectively, so that the driving element 192 can input The voltage signal is sent to the first driving electrode 171 and the second driving electrode 172 to control the arrangement state of the first liquid crystal layer LC1, and the driving element 194 can input the voltage signal to the third driving electrode 173 and the fourth driving electrode 174 to control the second liquid crystal. The layer LC2 is arranged so that the reflective display 100 can display images.

It is worth mentioning that in the embodiment shown in FIG. 1A , the second substrate 120 , the third substrate 130 and the first optical glue A12 bonded between the second substrate 120 and the third substrate 130 can be located at the electrical connection. between connectors 191 and 193, wherein both electrical connectors 191 and 193 may be located between drive elements 192 and 194, as shown in Figure 1A.

FIG. 2A is a schematic cross-sectional view of a reflective display according to another embodiment of the present invention. Please refer to FIG. 2A. The reflective display 200 of this embodiment is similar to the reflective display 100 of the previous embodiment. The reflective displays 200 and 100 also include some of the same components, such as the first liquid crystal layer LC1 and the second liquid crystal layer LC2. , the second driving electrode 172, the third driving electrode 173 and the fourth driving electrode 174. The following mainly describes the differences between the reflective displays 200 and 100 . Basically, the same features of the reflective displays 200 and 100 will not be repeatedly described.

Different from the first driving electrodes 171 of the reflective display 100 in FIG. 1A , the plurality of first driving electrodes 271 included in the reflective display 200 are opaque, so light cannot penetrate the first driving electrodes 271 . In other words, the first driving electrode 271 can block light. In addition, each first driving electrode 271 has a light-absorbing surface S27, wherein the light-absorbing surface S27 faces the first liquid crystal layer LC1 and can absorb light.

Each first driving electrode 271 may include a metal layer 271m and a light-absorbing film 271a, wherein the light-absorbing film 271a is disposed on the metal layer 271m and has a light-absorbing surface S27. Specifically, the metal layer 271m may be a molybdenum metal layer or a tantalum metal layer, and the light-absorbing film 271a may be made of molybdenum oxide or tantalum oxide, wherein the light-absorbing film 271a may be formed by oxidizing the surface of the metal layer 271m. The metal layer 271m can also be a metal layer other than molybdenum and tantalum, such as an aluminum metal layer, and the light-absorbing film 271a (such as a molybdenum oxide layer or a tantalum oxide layer) can be formed on the metal layer 271m through deposition, wherein the deposition can be a physical gas Phase deposition (Physical vapor deposition, PVD), such as sputtering or evaporation.

The first substrate 210 included in the reflective display 200 includes a support plate 111, a black light-absorbing layer 212 and a protective layer 213. The black light-absorbing layers 212 and 112 may be made of the same material, and the protective layers 213 and 113 may be made of the same material. same. However, unlike the first substrate 110 in the previous embodiment, in the first substrate 210, the black light-absorbing layer 212 is a pattern layer and partially covers the bearing surface 111s of the support plate 111. That is, the black light-absorbing layer 212 does not fully cover the bearing surface 111s. Face 111s.

FIG. 2B is a schematic top view of the black light-absorbing layer in FIG. 2A. Please refer to FIG. 2A and FIG. 2B. The black light-absorbing layer 212 includes a plurality of parallel first light-absorbing strips 212b, and there are gaps 212g between two adjacent first light-absorbing strips 212b. The first light-absorbing strips 212b and the gaps are 212g all extend toward the first direction D1 and are arranged along the second direction D2. The black light-absorbing layer 212 may also include two second light-absorbing strips 212s, wherein the two second light-absorbing strips 212s may extend toward the second direction D2 and connect the first light-absorbing strips 212b. These second light-absorbing strips 212s connect the outermost two first light-absorbing strips 212b to form a light-absorbing frame (not labeled), wherein the light-absorbing frame surrounds other first light-absorbing strips 212b except the outermost two first light-absorbing strips 212b.

The first driving electrodes 271 also extend toward the first direction D1 and are arranged along the second direction D2, wherein the first driving electrodes 271 are respectively aligned with the gaps 212g, so that the first driving electrodes 271 can cover the gaps 212g. . Therefore, the first driving electrodes 271 can block the light incident on the gaps 212g, so that it is difficult for the light to penetrate the black light-absorbing layer 212 from the gaps 212g.

The first substrate 210 and the first driving electrodes 271 can produce an optical density greater than or equal to 0.5, that is, the first substrate 210 and the first driving electrodes 271 can have an optical density greater than or equal to 0.5 after being integrated together, such as 0.6 or is an optical density greater than or equal to 1. In this way, the black light-absorbing layer 212 and the first driving electrodes 271 can effectively absorb the light penetrating the first liquid crystal layer LC1 and the second liquid crystal layer LC2 to improve the contrast, thereby improving the image quality of the reflective display 100 .

It is worth mentioning that the black light-absorbing layer 212 in this embodiment can be replaced by the black light-absorbing layer 112 in FIG. 1A , that is, the black light-absorbing layer 212 may not have any gaps 212g and completely cover the bearing surface of the support plate 111 111s, so that the first substrate 210 still has an optical density greater than or equal to 0.5. Therefore, the reflective display 200 in FIG. 2A can also use the black light-absorbing layer 112 in FIG. 1A , but FIG. 2A does not limit the reflective display 200 to include the black light-absorbing layer 212 .

FIG. 3A is a schematic cross-sectional view of a reflective display according to at least one embodiment of the present invention. Referring to FIG. 3A , the reflective display 300 of this embodiment is similar to the reflective display 100 of the previous embodiment, and the reflective displays 300 and 100 also include some same or similar components, such as the second substrate 120 and the third substrate 130 , the fourth substrate 140, the plurality of first driving electrodes 171, the plurality of second driving electrodes 172, the plurality of third driving electrodes 173 and the plurality of fourth driving electrodes 174.

Secondly, the first driving electrodes 171 and the second driving electrodes 172 are arranged as shown in FIG. 1B , and the third driving electrodes 173 and the fourth driving electrodes 174 are arranged as shown in FIG. 1C . The following mainly describes the differences between the reflective displays 300 and 100 . Basically, the same features of the reflective displays 300 and 100 will not be repeatedly described.

Different from the aforementioned reflective display 100 , the reflective display 300 not only includes the first substrate 310 , the second substrate 120 , the third substrate 130 and the fourth substrate 140 , but also includes the fifth substrate 350 and the sixth substrate 360 . The fifth substrate 350 and the sixth substrate 360 may be made of the same material as the second substrate 120 , the third substrate 130 and the fourth substrate 140 , that is, the fifth substrate 350 and the sixth substrate 360 may also be transparent substrates. The fifth substrate 350 is disposed on the fourth substrate 140 , and the sixth substrate 360 is disposed on the fifth substrate 350 , wherein the fifth substrate 350 is located between the fourth substrate 140 and the sixth substrate 360 .

The reflective display 300 also includes a plurality of fifth driving electrodes 375, a plurality of sixth driving electrodes 376, and a third liquid crystal layer LC33. The fifth driving electrodes 375 and the sixth driving electrodes 376 are both transparent conductive layers, which can be formed by transparent oxidation. Made of materials (TCO), such as indium tin oxide (ITO) or indium zinc oxide (IZO). The fifth driving electrodes 375 are disposed on the fifth substrate 350, and the sixth driving electrodes 376 are disposed on the sixth substrate 360, wherein the fifth driving electrodes 375 and the sixth driving electrodes 376 are located between the fifth substrate 350 and the sixth driving electrode 376. Between six substrates 360. The third liquid crystal layer LC33 is cholesteric liquid crystal and is disposed between the fifth driving electrodes 375 and the sixth driving electrodes 376 .

FIG. 3B is a schematic top view of the fifth driving electrode and the sixth driving electrode in FIG. 3A. Referring to FIG. 3A and FIG. 3B , these fifth driving electrodes 375 are arranged side by side so that there is a gap 375g between two adjacent fifth driving electrodes 375 . These sixth driving electrodes 376 are arranged side by side so that there is a gap 376g between two adjacent sixth driving electrodes 376 . The fifth driving electrodes 375 extend toward the fifth direction D5, and the sixth driving electrodes 376 extend toward the sixth direction D6, where the fifth direction D5 is different from the sixth direction D6, that is, the fifth direction D5 and the sixth direction D6 intersect. , so the fifth driving electrodes 375 and the sixth driving electrodes 376 overlap in a staggered manner. In addition, the fifth direction D5 and the sixth direction D6 may be substantially perpendicular to each other.

Please refer to Figure 3B and Figure 1B. It can be seen from Figure 1B and Figure 3B that the fifth direction D5 intersects with the first direction D1, and the sixth direction D6 intersects with the second direction D2. That is, the fifth direction D5 is different from the first direction D1. The sixth direction D6 is different from the second direction D2. In this embodiment, the fifth direction D5 can be parallel to the second direction D2, and the sixth direction D6 can be parallel to the first direction D1. That is, the fifth direction D5 can be the same as the second direction D2, and the sixth direction D6 can be Same as the first direction D1.

Please refer to Figure 3B, Figure 1B and Figure 1C. In this embodiment, the third direction D3 (see Figure 1C) can be parallel to the second direction D2, and the fourth direction D4 (see Figure 1C) can be parallel to The first direction D1 and therefore the fifth direction D5 may also be parallel to the third direction D3, and the sixth direction D6 may also be parallel to the fourth direction D4, as shown in FIG. 3B and FIG. 1C.

However, in other embodiments, the fifth direction D5 may not be parallel or perpendicular to the second direction D2 and/or the third direction D3, and the sixth direction D6 may not be parallel or perpendicular to the first directions D1 and D3. /or the fourth direction D4, so the fifth driving electrode 375 may not be parallel or perpendicular to at least one of the second driving electrode 172 and the third driving electrode 173, and the sixth driving electrode 376 may not be parallel or perpendicular. At least one of the first driving electrode 171 and the fourth driving electrode 174 .

Please refer to FIG. 3A and FIG. 3B . The fifth driving electrodes 375 and the sixth driving electrodes 376 can form multiple overlapping areas P3 , while FIG. 3B only marks one overlapping area P3 (represented by a lattice area). The fifth driving electrode 375 and the sixth driving electrode 376 can generate an electric field in these overlapping areas P3, so that the third liquid crystal layer LC33 can be in a focal cone arrangement state or a planar arrangement state, and reflect light of a specific wavelength, so the overlapping area P3 It is basically equivalent to the single-color pixel of the reflective display 300, that is, the sub-pixel.

The reflective display 300 further includes a first liquid crystal layer LC31 and a second liquid crystal layer LC32. The first liquid crystal layer LC31 is disposed between the first driving electrodes 171 and the second driving electrodes 172 , and the second liquid crystal layer LC32 is disposed between the third driving electrodes 173 and the fourth driving electrodes 174 . The first liquid crystal layer LC31 and the second liquid crystal layer LC32 are both cholesteric liquid crystals. Therefore, each of the first liquid crystal layer LC31, the second liquid crystal layer LC32 and the third liquid crystal layer LC33 can reflect light of a specific wavelength, such as red light, according to Bragg's law. , green light or blue light.

When the first liquid crystal layer LC31, the second liquid crystal layer LC32 and the third liquid crystal layer LC33 are all in a planar arrangement state, the first liquid crystal layer LC31, the second liquid crystal layer LC32 and the third liquid crystal layer LC33 can reflect light of different wavelengths. For example, in this embodiment, the first liquid crystal layer LC31 in a planar arrangement state can reflect red light, the second liquid crystal layer LC32 in a planar arrangement state can reflect green light, and the third liquid crystal layer LC33 in a planar arrangement state can reflect light. Reflect blue light so that the reflective display 300 can display images.

The reflective display 300 may also include a first optical glue A12 and a second optical glue A23, wherein the first optical glue A12 is disposed between the second substrate 120 and the third substrate 130 and is bonded to the second substrate 120 and the third substrate. 130. The second optical glue A23 is disposed between the fourth substrate 140 and the fifth substrate 350 and adhered to the fourth substrate 140 and the fifth substrate 350 . In one embodiment, the first optical glue A12 and the second optical glue A23 can be transparent and colorless glue layers, that is, the first optical glue A12 and the second optical glue A23 are transparent, and they will not change substantially. The color of light.

However, in other embodiments, the first optical glue A12 and the second optical glue A23 may have a light filtering function. For example, each of the first optical glue A12 and the second optical glue A23 may contain at least one dye to filter out light of a specific wavelength, thereby improving the image color of the reflective display 300 . When the first liquid crystal layer LC31 can reflect red light, the second liquid crystal layer LC32 can reflect green light, and the third liquid crystal layer LC33 can reflect blue light, the second optical glue A23 can absorb blue light and allow yellow light to pass through, so that the incident The light in the second liquid crystal layer LC32 basically does not contain blue light. The second optical glue A23 can absorb green light and allow red light to pass through, so that the light incident on the first liquid crystal layer LC31 substantially does not contain green light. In this way, the image color of the reflective display 300 can be improved.

The reflective display 300 may further include a protective layer 143, a protective layer 363, a first light-shielding layer 342, and a second light-shielding layer 343. The first light-shielding layer 342 is disposed on the fourth substrate 140 and is located between the fourth substrate 140 and the fourth driving electrodes 174 . The protective layer 143 is disposed on the fourth substrate 140 and the first light-shielding layer 342, and the first light-shielding layer 342 and the protective layer 143 are located between the fourth driving electrodes 174 and the fourth substrate 140. The protective layer 143 can protect the first light-shielding layer 140 and the fourth driving electrode 174. The light shielding layer 342 is protected from damage during processes such as etching or developing.

The second light-shielding layer 343 is disposed on the sixth substrate 360 and is located between the sixth substrate 360 and the sixth driving electrodes 376 . The protective layer 363 is disposed on the sixth substrate 360 and the second light-shielding layer 343 , and the second light-shielding layer 343 and the protective layer 363 are located between the sixth driving electrodes 376 and the sixth substrate 360 . The protective layers 363 and 143 may be made of the same material, and the protective layer 363 can protect the second light-shielding layer 343 from being damaged during processes such as etching or developing.

FIG. 3C is a schematic top view of the second light-shielding layer in FIG. 3A , and FIG. 3D is a schematic top view of the first light-shielding layer in FIG. 3A . Referring to FIGS. 3C and 3D , the shapes of the second light-shielding layer 343 (shown in FIG. 3C ) and the first light-shielding layer 342 (shown in FIG. 3D ) are different from each other. Specifically, the second light shielding layer 343 shown in FIG. 3C includes a second light shielding frame 343f and a second light shielding pattern 343p, and the first light shielding layer 342 shown in FIG. 3D includes a first light shielding frame 342f and a first light shielding pattern 342p. .

Please refer to Figure 3C. In the second light-shielding layer 343, the second light-shielding pattern 343p is located in the second light-shielding frame 343f, and the second light-shielding pattern 343p includes a plurality of parallel second light-absorbing strips AB2, so two adjacent second light-shielding strips AB2 There is a gap of 343g between the light-absorbing strips AB2. In addition, there is also a gap 343g between the second light-shielding frame 343f and its adjacent second light-absorbing strip AB2. The second light-absorbing strips AB2 and the gaps 343g both extend toward the sixth direction D6 and can be arranged along the fifth direction D5, as shown in FIG. 3C .

Referring to FIG. 3B and FIG. 3C , the sixth driving electrodes 376 are respectively aligned with the gaps 343g, and the second light-absorbing strips AB2 are respectively aligned with the gaps 376g between the sixth driving electrodes 376 . Therefore, the second light shielding pattern 343p can cover the gaps 376g between the sixth driving electrodes 376, but does not basically cover the sixth driving electrodes 376, so that light can be incident on the sixth driving electrodes 376 and 376 from the gaps 343g. These overlap areas P3. In this way, the third liquid crystal layer LC33 can reflect light (eg, blue light), and the second light-shielding layer 343 helps prevent light leakage to improve the contrast of the reflective display 300 .

Please refer to FIG. 3D. In the first light-shielding layer 342, the first light-shielding pattern 342p is located in the first light-shielding frame 342f, and the first light-shielding pattern 342p includes a plurality of parallel first light-absorbing strips AB1, so two adjacent first light-shielding strips AB1 There is a gap of 342g between the light-absorbing strips AB1. In addition, there is also a gap 342g between the first light-shielding frame 342f and its adjacent first light-absorbing strip AB1. The first light-absorbing strips AB1 and the gaps 342g both extend toward the third direction D3 and can be arranged along the fourth direction D4, as shown in FIG. 3D .

Referring to FIG. 1C and FIG. 3D , the third driving electrodes 173 are respectively aligned with the gaps 342g, and the first light-absorbing strips AB1 are respectively aligned with the gaps 173g between the third driving electrodes 173 . Therefore, the first light shielding pattern 342p can cover the gaps 173g between the third driving electrodes 173, but does not basically cover the third driving electrodes 173, so that light can be incident on the third driving electrodes 173 and 173 from the gaps 342g. These overlap areas P2. In this way, the second liquid crystal layer LC32 can reflect light (eg, green light), and the first light-shielding layer 342 can help prevent light leakage to improve the contrast of the reflective display 300 .

Please refer to FIG. 3C and FIG. 3D. The first light-shielding layer 342 and the second light-shielding layer 343 overlap each other, wherein the first light-shielding patterns 342p and the second light-shielding patterns 343p are staggered and overlapped, so that the first light-shielding patterns 342p and the second light-shielding patterns 343p are overlapped. A network structure will be formed. Therefore, the first light-shielding pattern 342p and the second light-shielding pattern 343p will partially cover the first driving electrodes 171, the second driving electrodes 172, the third driving electrodes 173, the fourth driving electrodes 174, and the fifth driving electrodes 375. with these sixth drive electrodes 376 to help reduce or avoid light leakage.

It should be noted that the overlapping first light-shielding pattern 342p and the second light-shielding pattern 343p basically do not cover these overlapping areas P1, P2 and P3, so external light can penetrate the first light-shielding pattern 342p and the second light-shielding pattern 343p. The first liquid crystal layer LC31 in the overlapping area P1, the second liquid crystal layer LC32 in the overlapping area P2, and the third liquid crystal layer LC33 in the overlapping area P3 are incident on the first liquid crystal layer LC31 and the second liquid crystal layer LC33 in the overlapping area P3. The layer LC32 and the third liquid crystal layer LC33 can respectively reflect light of specific wavelengths, such as red light, green light and blue light, from these overlapping areas P1, P2 and P3, so that the reflective display 300 can display images.

In particular, since the first light-shielding patterns 342p and the second light-shielding patterns 343p are staggered and overlapped to form a network structure, the first light-shielding patterns 342p and the second light-shielding patterns 343p can reduce or eliminate the diffraction effect on light. . In this way, the first light-shielding pattern 342p and the second light-shielding pattern 343p help to suppress or prevent the formation of moire patterns, thereby improving the image quality of the reflective display 300.

Referring to FIG. 3A , the reflective display 300 further includes a plurality of third spacers 383 , wherein the third spacers 383 are disposed between the sixth substrate 360 and the fifth substrate 350 , and at least one of the third spacers 383 is disposed between the sixth substrate 360 and the fifth substrate 350 . Within the gap 376g (please refer to Figure 3B). For example, each third spacer 383 may be located on two adjacent sixth driving electrodes 376 and extend into the gap 376g between the two sixth driving electrodes 376. Therefore, the second light-shielding layer 343 can cover at least one of the third spacers 383 to weaken or eliminate light leakage caused by the third spacers 383 .

Since the first light-shielding pattern 342p and the second light-shielding pattern 343p form a network structure, the first light-shielding layer 342 and the second light-shielding layer 343 can cover all the first spacers 181, the second spacers 182, and the third spacers 383. , to effectively weaken or eliminate the light leakage caused by the first spacer 181, the second spacer 182 and the third spacer 383, wherein the first light-shielding layer 342 or the second light-shielding layer 343 can cover these first spacers 181, 182 and 383. At least one of the second spacers 182 and the third spacers 383 .

Different from the first substrate 110 in the previous embodiment, in this embodiment, the first substrate 310 is a black substrate and has an optical density greater than or equal to 0.5. Specifically, the first substrate 310 may not include the black light-absorbing layer 112 or 212, and the first substrate 310 may include a support plate 311 and a protective layer 113. The support plate 311 may be a black plate and can absorb light, and the black The plate material is, for example, a black glass plate or a black ceramic plate. Furthermore, in other embodiments, the first substrate 310 may only include the support plate 311. In other words, the protective layer 113 in FIG. 3A may be omitted, and the first substrate 310 may be a black support plate 311.

It is worth mentioning that the first substrate 310 can be applied to the aforementioned reflective display 100 . Specifically, in the reflective display 100 shown in FIG. 1A , the first substrate 110 can be replaced with the first substrate 310 in FIG. 3A , and the protective layer 113 of the first substrate 310 can be omitted. Furthermore, in the reflective display 300 shown in FIG. 3A , the first substrate 310 may be replaced with the first substrate 110 in FIG. 1A or the first substrate 210 in FIG. 2A . When the first substrate 310 in FIG. 3A is replaced with the first substrate 210 in FIG. 2A, these first driving electrodes 171 can be replaced with the first driving electrodes 271 in FIG. 2A. Therefore, the reflective display 300 shown in FIG. 3A is only for illustration and does not limit the structure of the first substrate 310 .

In addition, in this embodiment, the reflective display 300 not only includes the frame glue S12 and S34, but also includes the frame glue S56, where the frame glue S56 is located between the fifth substrate 350 and the sixth substrate 360 and is adhered to the fifth substrate. The substrate 350 and the sixth substrate 360. The sealant S56 surrounds the third liquid crystal layer LC33 so that the fifth substrate 350, the sixth substrate 360 and the sealant S56 can seal the third liquid crystal layer LC33.

Reflective display 300 may also include three electrical connectors 191, 193, and 395 and three driving elements 192, 194, and 396. The driving element 396 may be a die, and the electrical connector 395 may be a circuit board, such as a flexible circuit board (FPC). The driving element 396 is installed on the electrical connector 395. For example, the driving element 396 can be installed on the electrical connector 395 using anisotropic conductive glue (ACF) or a chip-on-film packaging (COF), so that the driving element 396 is electrically connected to the electrical connector 395 . In this way, the driving element 396 can input voltage signals to the fifth driving electrode 375 and the sixth driving electrode 376 to control the arrangement state of the third liquid crystal layer LC33 so that the reflective display 300 can display images.

FIG. 4A is a schematic top view of the second light-shielding layer according to another embodiment of the present invention. Referring to FIG. 4A , the second light-shielding layer 443 includes a second light-shielding frame 343f and a second light-shielding pattern 443p. The second light-shielding pattern 443p is surrounded by the second light-shielding frame 343f and includes a plurality of light absorption points AP2, where the light absorption points AP2 can be arranged in an array. The second light-shielding layer 443 may be applied to the reflective display 300 shown in FIG. 3A. That is to say, in the reflective display 300 shown in FIG. 3A , the second light shielding layer 343 can be replaced by the second light shielding layer 443 shown in FIG. 4A , wherein the function of the second light shielding layer 443 is substantially the same as that of the second light shielding layer 443 . layer 343, so the second light-shielding layer 443 also helps prevent light leakage to improve contrast.

FIG. 4B is a schematic top view of the second light-shielding layer in FIG. 4A and the first light-shielding layer in FIG. 3D . Referring to FIG. 4B, after the second light-shielding layer 343 in the reflective display 300 shown in FIG. 3A is replaced with the second light-shielding layer 443, each light-absorbing point AP2 can be aligned with the gap 342g of the first light-shielding pattern 342p, so that the multiple The light absorption points AP2 can be distributed on opposite sides of one of the first light absorption strips AB1, and a plurality of light absorption points AP2 can be arranged along the gap 342g.

Secondly, as shown in FIG. 4B , the first light-shielding pattern 342p and the second light-shielding pattern 443p can form a network structure, in which the overlapping areas P1, P2 and P3 are respectively aligned with the grid of this network structure, so the staggered and overlapping first The light shielding pattern 342p and the second light shielding pattern 443p basically do not cover the overlapping areas P1, P2 and P3, so that external light can be incident on the overlapping areas P1, P2 and P3. In this way, the first liquid crystal layer LC31, the second liquid crystal layer LC32 and the third liquid crystal layer LC33 can respectively reflect light of specific wavelengths from these overlapping areas P1, P2 and P3, thereby forming an image.

It is worth mentioning that in the reflective display 300 shown in FIG. 3A , the first light-shielding layer 342 and the second light-shielding layer 343 can be swapped. In other words, the first light-shielding layer 342 may be located between the sixth substrate 360 and the sixth driving electrodes 376 , and the second light-shielding layer 343 may be located between the fourth substrate 140 and the fourth driving electrodes 174 . In other embodiments, when the second light shielding layer 343 is located between the fourth substrate 140 and the fourth driving electrodes 174, the second light shielding layer 443 shown in FIG. 4A may be located between the sixth substrate 360 and the sixth driving electrodes 174. Between 376. Therefore, the arrangement of the first light-shielding layer 342 and the second light-shielding layers 343 and 443 is not limited to FIG. 3A.

Although the present invention has been disclosed above through embodiments, they are not intended to limit the present invention. Those with ordinary skill in the technical field to which the present invention belongs may make some modifications and modifications without departing from the spirit and scope of the present invention. Therefore, the present invention is The scope of invention protection shall be determined by the appended patent application scope.

100, 200, 300: Reflective display 110, 210, 310: first substrate 111, 311: Support plate 111s: Bearing surface 112, 212: Black light-absorbing layer 113, 143, 213, 363: protective layer 120: Second substrate 130:Third substrate 140:Fourth substrate 142, 342: first light-shielding layer 142f, 342f: first shading frame 142h:Open your mouth 142p, 342p: first shading pattern 171, 271: first driving electrode 171g, 172g, 173g, 174g, 212g, 342g, 343g, 375g, 376g: clearance 172: Second drive electrode 173: Third driving electrode 174: Fourth drive electrode 181: First spacer 182: Second spacer 192, 194, 396: driving components 191, 193, 395: Electrical connector 212b, AB1: first light absorption strip 212s, AB2: second light absorption strip 271a:Light absorbing film 271m:Metal layer 343, 443: Second light shielding layer 343f: Second shading frame 343p, 443p: Second shading pattern 350:Fifth substrate 360:Sixth substrate 375: Fifth driving electrode 376:Sixth drive electrode 383:Third spacer A12: The first optical glue A23: Second optical glue AP2: light absorption point D1: first direction D2: second direction D3: Third direction D4: The fourth direction D5: fifth direction D6: The sixth direction LC1, LC31: first liquid crystal layer LC2, LC32: second liquid crystal layer LC33: The third liquid crystal layer P1, P2, P3: overlapping areas S12, S34, S56: frame glue S27: Light-absorbing surface

FIG. 1A is a schematic cross-sectional view of a reflective display according to at least one embodiment of the present invention. FIG. 1B is a schematic top view of the first driving electrode and the second driving electrode in FIG. 1A . FIG. 1C is a schematic top view of the third driving electrode and the fourth driving electrode in FIG. 1A . FIG. 1D is a schematic top view of the first light-shielding layer in FIG. 1A. FIG. 2A is a schematic cross-sectional view of a reflective display according to another embodiment of the present invention. FIG. 2B is a schematic top view of the black light-absorbing layer in FIG. 2A. FIG. 3A is a schematic cross-sectional view of a reflective display according to at least one embodiment of the present invention. FIG. 3B is a schematic top view of the fifth driving electrode and the sixth driving electrode in FIG. 3A; FIG. 3C is a schematic top view of the second light-shielding layer in FIG. 3A. FIG. 3D is a schematic top view of the first light-shielding layer in FIG. 3A. FIG. 4A is a schematic top view of the second light-shielding layer according to another embodiment of the present invention. FIG. 4B is a schematic top view of the second light-shielding layer in FIG. 4A and the first light-shielding layer in FIG. 3D .

100: Reflective display

110: First substrate

111:Support plate

111s: Bearing surface

112: Black light-absorbing layer

113, 143: Protective layer

120: Second substrate

130:Third substrate

140:Fourth substrate

142: First light shielding layer

171: First driving electrode

172: Second drive electrode

173: Third driving electrode

174: Fourth drive electrode

181: First spacer

182: Second spacer

192, 194: Drive components

191, 193: Electrical connector

A12: The first optical glue

LC1: first liquid crystal layer

LC2: Second liquid crystal layer

S12, S34: frame glue

Claims (14)

A reflective display includes: a first substrate with an optical density greater than or equal to 0.5; a plurality of first driving electrodes disposed on the first substrate and extending in a first direction, wherein the first driving electrodes extend along arranged in a second direction, and the first direction intersects with the second direction, the first driving electrodes are opaque, and each first driving electrode has a light-absorbing surface; a second substrate; a plurality of second driving electrodes Driving electrodes are provided on the second substrate and extend toward the second direction, wherein the second driving electrodes are arranged along the first direction, and the first driving electrodes and the second driving electrodes are staggered and overlapped, And the first driving electrodes and the second driving electrodes are located between the first substrate and the second substrate; a first liquid crystal layer is provided between the first driving electrodes and the second driving electrodes. , wherein the light-absorbing surface faces the first liquid crystal layer; a third substrate is disposed on the second substrate; a plurality of third driving electrodes are disposed on the third substrate and extend toward a third direction, wherein the third Three directions intersect with the first direction; a fourth substrate, wherein the third substrate is located between the fourth substrate and the second substrate; a plurality of fourth driving electrodes are disposed on the fourth substrate and face a first Extending in four directions, the fourth direction intersects with the second direction, the third driving electrodes and the fourth driving electrodes are staggered and overlapped, and the third driving electrodes and the fourth driving electrodes are located on the third between the substrate and the fourth substrate between; and a second liquid crystal layer disposed between the third driving electrodes and the fourth driving electrodes. The reflective display of claim 1, wherein the first substrate is a black substrate. The reflective display of claim 1, wherein the first substrate includes: a support plate having a bearing surface; and a black light-absorbing layer disposed on the bearing surface and located between the first driving electrodes and the Between the support plates, the black light-absorbing layer completely covers the bearing surface. The reflective display of claim 1, wherein each first driving electrode includes: a metal layer; and a light-absorbing film disposed on the metal layer and having the light-absorbing surface. The reflective display as claimed in claim 1, further comprising: a first light-shielding layer disposed on the fourth substrate and located between the fourth substrate and the fourth driving electrodes; and a plurality of first spacers component, disposed between the first substrate and the second substrate, wherein there is a gap between two adjacent first driving electrodes, and the At least one first spacer is disposed in the gap. The reflective display of claim 5, wherein the first light-shielding layer covers at least one of the first spacers. The reflective display according to claim 5, further comprising: a plurality of second spacers disposed between the third substrate and the fourth substrate, wherein the first light-shielding layer covers at least one of the second spacers . The reflective display according to claim 5, further comprising: a fifth substrate disposed on the fourth substrate; a plurality of fifth driving electrodes disposed on the fifth substrate and extending in a fifth direction, wherein The fifth direction intersects with the first direction; a sixth substrate, wherein the fifth substrate is located between the fourth substrate and the sixth substrate; a plurality of sixth driving electrodes are disposed on the sixth substrate, and Extending toward a sixth direction, wherein the sixth direction intersects with the second direction, the sixth driving electrodes and the fifth driving electrodes are staggered and overlapped, and the fifth driving electrodes and the sixth driving electrodes are located at the between the fifth substrate and the sixth substrate; a third liquid crystal layer disposed between the fifth driving electrodes and the sixth driving electrodes; and a second light-shielding layer disposed on the sixth substrate, and is located between the sixth substrate and the sixth driving electrodes, wherein the second light-shielding layer covers the at least one of the first spacers. The reflective display of claim 8, wherein the shapes of the first light-shielding layer and the second light-shielding layer are different from each other. A reflective display includes: a first substrate; a plurality of first driving electrodes disposed on the first substrate and extending in a first direction, wherein the first driving electrodes are arranged along a second direction, and The first direction intersects with the second direction, the first driving electrodes are opaque, and each first driving electrode has a light-absorbing surface; a second substrate; a plurality of second driving electrodes disposed on the second on the substrate and extending toward the second direction, wherein the second driving electrodes are arranged along the first direction, the first driving electrodes and the second driving electrodes are staggered and overlapped, and the first driving electrodes and The second driving electrodes are located between the first substrate and the second substrate; a first liquid crystal layer is provided between the first driving electrodes and the second driving electrodes, wherein the light-absorbing surface faces the third a liquid crystal layer; a third substrate disposed on the second substrate; a plurality of third driving electrodes disposed on the third substrate and extending toward the third direction, wherein the third direction is consistent with the first direction Staggered; a fourth substrate, wherein the third substrate is located between the fourth substrate and the second substrate; A plurality of fourth driving electrodes are disposed on the fourth substrate and extend toward the fourth direction, where the fourth direction intersects with the second direction, and the third driving electrodes overlap with the fourth driving electrodes. , and the third driving electrodes and the fourth driving electrodes are located between the third substrate and the fourth substrate; and a second liquid crystal layer is provided between the third driving electrodes and the fourth driving electrodes. between. The reflective display of claim 10, wherein the first substrate is a black substrate. The reflective display of claim 10, wherein the first substrate includes: a support plate having a bearing surface; and a black light-absorbing layer disposed on the bearing surface and located between the first driving electrodes and the Between the support plates, the black light-absorbing layer completely covers the bearing surface. The reflective display of claim 10, wherein the first substrate and the first driving electrodes generate an optical density, and the optical density is greater than or equal to 0.5. The reflective display as claimed in claim 10, wherein each first driving electrode includes: a metal layer; and a light-absorbing film disposed on the metal layer and having the light-absorbing surface.

Images