CN113960831A

CN113960831A - Display panel

Info

Publication number: CN113960831A
Application number: CN202010704544.1A
Authority: CN
Inventors: 吴许合; 游家华; 林松君; 林侑正; 蔡博凯; 李政彦
Original assignee: Hannstar Display Corp
Current assignee: Hannstar Display Corp
Priority date: 2020-07-21
Filing date: 2020-07-21
Publication date: 2022-01-21

Abstract

The invention provides a display panel which comprises a first substrate, a second substrate, a display medium layer, a plurality of pixel structures and a light source structure. The first substrate and the second substrate are arranged opposite to each other. The display medium layer is arranged between the first substrate and the second substrate. The pixel structures are arranged on the first substrate and respectively comprise a reflecting electrode and a light excitation layer. The reflective electrode is overlapped on the light excitation layer and is positioned between the light excitation layer and the first substrate. The light source structure is arranged on the second substrate.

Description

Display panel

Technical Field

The present disclosure relates to display technologies, and particularly to a display panel.

Background

Generally, thin film transistor liquid crystal display (TFT-LCD) panels can be classified into three categories, i.e., transmissive, reflective, and transflective, according to the utilization of light sources and the difference between TFT array substrates. The reflective TFT-LCD panel mainly uses a front-light source (front-light) or an external light source as a light source, and the pixel electrode on the TFT array substrate is a metal or other reflective electrode with good reflective properties, which is suitable for reflecting the front light source or the external light source. At present, reflective liquid crystal display panels are mostly applied in black and white or black and red. In order to increase the diversity of colors, more color filters must be disposed in the transmissive regions of the pixels, resulting in a decrease in contrast and reflectivity. Therefore, the development of reflective liquid crystal display panels with diversified colors and high vividness is still one of the important issues of related manufacturers.

Disclosure of Invention

The invention provides a display panel which has better diversity and vividness of display colors.

The display panel comprises a first substrate, a second substrate, a display medium layer, a plurality of pixel structures and a light source structure. The first substrate and the second substrate are arranged opposite to each other. The display medium layer is arranged between the first substrate and the second substrate. The pixel structures are arranged on the first substrate and respectively comprise a reflecting electrode and a light excitation layer. The reflective electrode is overlapped on the light excitation layer and is positioned between the light excitation layer and the first substrate. The light source structure is arranged on the second substrate.

In an embodiment of the invention, the light source structure includes a light guide plate and a light source. The light guide plate is provided with a light emergent surface and a light incident surface. The light-emitting surface faces the second substrate. The light source is arranged on one side of the light incident surface of the light guide plate.

In an embodiment of the invention, the optical excitation layer includes at least one first wavelength conversion particle and at least one second wavelength conversion particle. The first wavelength conversion particles and the second wavelength conversion particles respectively generate first light and second light after being irradiated by the light source structure, and the color of the first light is different from that of the second light.

In an embodiment of the invention, the plurality of pixel structures include a first pixel structure and a second pixel structure. The optically active layer of the first pixel structure comprises at least one first wavelength converting particle and the optically active layer of the second pixel structure comprises at least one second wavelength converting particle. The first wavelength conversion particles and the second wavelength conversion particles respectively generate first light and second light after being irradiated by the light source structure, and the color of the first light is different from that of the second light.

In an embodiment of the invention, the color of the first light and the color of the second light are red and green, respectively.

In an embodiment of the invention, the wavelength of the first light is greater than the wavelength of the second light, and the light emitted by the light source structure includes light having a wavelength less than the wavelength of the second light.

In an embodiment of the invention, the light emitted by the light source structure includes blue light or ultraviolet light.

In an embodiment of the invention, the plurality of pixel structures further includes a third pixel structure. The photo-excited layer of the third pixel structure comprises at least one third wavelength converting particle. The third wavelength conversion particles generate third light after being irradiated by the light source structure, and the color of the third light is different from the colors of the first light and the second light.

In an embodiment of the invention, the color of the first light, the color of the second light, and the color of the third light are red, green, and blue, respectively.

In an embodiment of the invention, a wavelength of the first light is greater than a wavelength of the second light, the wavelength of the second light is greater than a wavelength of the third light, and the light emitted by the light source structure includes light having a wavelength less than the wavelength of the third light.

In an embodiment of the invention, the light emitted by the light source structure includes ultraviolet light.

In view of the above, in the display panel according to an embodiment of the invention, the color diversity of the display panel can be increased without reducing the contrast and the reflectivity by disposing the light excitation layer overlapping the reflective electrode of the pixel structure. On the other hand, the second substrate of the display panel is provided with a light source structure, and the light source structure is used for emitting light towards the reflecting electrode of the pixel structure. Therefore, the operation flexibility and the color vividness of the display panel can be further improved.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and together with the description serve to explain the principles of the invention.

FIG. 1 is a schematic top view of a display panel according to a first embodiment of the present invention;

FIG. 2 is a schematic partial cross-sectional view of the display panel of FIG. 1;

FIG. 3 is a schematic top view of a display panel according to a second embodiment of the present invention;

FIG. 4 is a schematic partial cross-sectional view of the display panel of FIG. 3;

FIG. 5 is a schematic top view of a display panel according to a first variation of the second embodiment of the present invention;

FIG. 6 is a schematic partial cross-sectional view of the display panel of FIG. 5;

fig. 7 is a schematic partial cross-sectional view of a display panel according to a third embodiment of the present invention;

fig. 8 is a schematic partial cross-sectional view of a display panel according to a fourth embodiment of the present invention;

FIG. 9 is a schematic top view of a display panel according to a fifth embodiment of the present invention;

fig. 10 is a partial cross-sectional schematic view of the display panel of fig. 9.

Description of the reference numerals

10. 11, 11a, 12, 13, 14: a display panel;

101: a first substrate;

102: a second substrate;

110: a gate insulating layer;

120: a first insulating layer;

130: a second insulating layer;

130 r: an opening;

130 s: a surface;

135: an optical microstructure;

140: a protective layer;

200: a light source structure;

210: a light guide plate;

210 a: a light incident surface;

210 b: a light-emitting surface;

220: a light source;

CLC1, CLC2, CLC3, CLC1-A, CLC2-A, CLC 3-A: a cholesterol liquid crystal layer;

and (3) CP: a conductive pattern;

d: a drain electrode;

DL: a data line;

DML, DML-A, DML-B: a display medium layer;

EB. LB: light rays;

g: a gate electrode;

GL: scanning a line;

LC: liquid crystal molecules;

OC: an ohmic contact layer;

PA: a pixel region;

PE, PE1, PE2, PE 3: a reflective electrode;

PEL, PEL1, PEL2, PEL 3: a light excitation layer;

PR1, PR2, PR 3: a pixel column;

PX, PX1, PX2, PX1-A, PX2-A, PX3-A, PX3-A1, PX1-B, PX2-B, PX 3-B: a pixel structure;

s: a source electrode;

SC: a semiconductor pattern;

SP: a spacer;

t: an active component;

WCP1, WCP2, WCP 3: wavelength converting particles;

x, Y: and (4) direction.

Detailed Description

The foregoing and other technical matters, features and effects of the present invention will be apparent from the following detailed description of a preferred embodiment, which is to be read in connection with the accompanying drawings. Directional terms as referred to in the following examples, for example: up, down, left, right, front or rear, etc., are simply directions with reference to the drawings. Accordingly, the directional terminology is used for purposes of illustration and is in no way limiting. Some examples of the invention are set forth below to illustrate the disclosure in detail. Wherever possible, the same reference numbers will be used throughout the drawings and the description to refer to the same or like parts.

Fig. 1 is a schematic top view of a display panel according to a first embodiment of the invention. Fig. 2 is a partial cross-sectional schematic view of the display panel of fig. 1. Specifically, for the sake of clarity, fig. 1 only shows the first substrate 101, the light source 220, the scanning line GL, the data line DL, the reflective electrode PE and the light excitation layer PEL of fig. 2, and the light excitation layer PEL of fig. 1 omits the illustration of the first wavelength conversion particle WCP1, the second wavelength conversion particle WCP2 and the third wavelength conversion particle WCP3 of fig. 2. Referring to fig. 1 and fig. 2, the display panel 10 includes a first substrate 101, a second substrate 102, a display medium layer DML, and a plurality of pixel structures PX. The first substrate 101 and the second substrate 102 are disposed opposite to each other. The display medium layer DML is disposed between the first substrate 101 and the second substrate 102. In the present embodiment, the display medium layer DML includes, for example, a plurality of liquid crystal molecules LC. That is, the display panel 10 is, for example, a liquid crystal display panel.

More specifically, the display panel 10 of the present embodiment is a reflective liquid crystal display panel. The pixel structures PX are disposed on the first substrate 101, and each pixel structure PX includes a reflective electrode PE. For example, the display panel 10 further includes a plurality of scan lines GL and a plurality of data lines DL. These scanning lines GL are arranged along the direction Y and extend in the direction X. These data lines DL are arranged along the direction X and extend in the direction Y. That is, the scan lines GL intersect the data lines DL and define a plurality of pixel areas PA of the display panel 10. The plurality of pixel structures PX are respectively disposed in the pixel regions PA, and each pixel of the display panel 10 includes a portion of the display medium layer DML and the pixel structure PX located in the corresponding pixel region PA. The pixel structure PX includes a reflective electrode PE and an active device T. The reflective electrode PE is electrically connected to the active device T. In the present embodiment, the active device T may be a thin film transistor, but not limited thereto. In this embodiment, the material of the reflective electrode PE may include metal or other suitable materials.

It should be understood that, in the present embodiment, the display panel 10 may further include a conductive layer (not shown), such as a common electrode layer, disposed on the second substrate 102 and located between the second substrate 102 and the display medium layer DML, but not limited thereto. When the display panel 10 is enabled, the electric field formed between the conductive layer and the reflective electrode PE of the pixel structure PX drives the liquid crystal molecules LC of the display medium layer DML to rotate to form an arrangement distribution corresponding to the magnitude of the electric field. For example, in the embodiment, the display medium layer DML may be driven in an Electrically Controlled Birefringence (ECB) mode, but the invention is not limited thereto. In other embodiments, the display dielectric layer DML may be driven In a mode of lateral electric Field Switching (IPS), Fringe Field Switching (FFS), Twisted Nematic (TN), Super Twisted Nematic (STN), Vertical Alignment (VA), or Optically Compensated Bend (OCB).

In this embodiment, the method for forming the active device T may include the following steps: a gate electrode G, a gate insulating layer 110, a semiconductor pattern SC, an ohmic contact layer OC, a source electrode S, and a drain electrode D are sequentially formed on the first substrate 101, but not limited thereto. The semiconductor pattern SC overlaps the gate electrode G in a direction perpendicular to the first substrate 101. The source S and the drain D are overlapped on the semiconductor pattern SC and electrically connected to two different regions of the semiconductor pattern SC through the ohmic contact layer OC. For example, in the present embodiment, the gate G of the active device T is optionally disposed below the semiconductor pattern SC to form a bottom-gate thin film transistor (bottom-gate TFT), but the invention is not limited thereto. In other embodiments, the gate electrode G of the active device may also be optionally disposed above the semiconductor pattern SC to form a top-gate thin film transistor (top-gate TFT).

It should be noted that the gate G, the source S, the drain D, the semiconductor pattern SC, the ohmic contact layer OC and the gate insulating layer 110 may be respectively implemented by any gate, any source, any drain, any semiconductor pattern, any ohmic contact layer, any gate insulating layer and any insulating layer known to those skilled in the art for a display panel, and the gate G, the source S, the drain D, the semiconductor pattern SC, the ohmic contact layer OC and the gate insulating layer 110 may be respectively formed by any method known to those skilled in the art, and therefore, no further description is provided herein.

In the present embodiment, the display panel 10 may further include a first insulating layer 120, a second insulating layer 130, and a conductive pattern CP. The conductive pattern CP penetrates the first insulating layer 120 to electrically connect the drain D of the active device T. The second insulating layer 130 is disposed on the first insulating layer 120 as a planarization layer, and has an opening 130r overlapping the drain D of the active device T. The reflective electrode PE is disposed on the second insulating layer 130 and extends into the opening 130r to electrically connect the conductive pattern CP. However, the invention is not limited thereto, and according to other embodiments, the reflective electrode PE may also penetrate the insulating layer 120 to directly electrically connect the drain D of the active device T, so that the conductive pattern CP is not required to be disposed. In addition, in other embodiments, only one insulating layer (e.g., only the second insulating layer 130) may be disposed between the reflective electrode PE and the active device T, and/or the reflective electrode PE may penetrate the insulating layer to directly electrically connect to the drain D of the active device T. In the embodiment, the surface 130s of the second insulating layer 130 may be provided with a plurality of optical microstructures 135 to increase the uniformity of the outgoing light after the external light is reflected by the reflective electrode PE, but the invention is not limited thereto. In this embodiment, the display panel 10 further includes a protection layer 140 and a spacer SP. The passivation layer 140 is disposed on the second substrate 102. The material of the protection layer 140 may include an inorganic insulating material (e.g., silicon oxide or silicon nitride) or an organic insulating material (e.g., organic resin). In some embodiments, the display panel 10 may not include the protective layer 140. The spacer SP is located between the passivation layer 140 and the insulating layer 120, and is configured to maintain the thickness of the display medium layer DML at a predetermined value. However, the invention is not limited thereto, and in some embodiments, the spacer SP may be disposed on the second insulating layer 130, for example, the spacer SP may be located between the protection layer 140 and the second insulating layer 130.

It is worth mentioning that the pixel structure PX further includes a photoexcited layer PEL. The optical excitation layer PEL overlaps the reflective electrode PE in a direction perpendicular to the first substrate 101, and the reflective electrode PE is located between the optical excitation layer PEL and the first substrate 101. In the present embodiment, the photoexcitation layer PEL of the pixel structure PX includes a plurality of wavelength conversion particles. The wavelength converting particles may include at least one first wavelength converting particle WCP1, at least one second wavelength converting particle WCP2, and at least one third wavelength converting particle WCP3, and the light emitting wavelengths of the first wavelength converting particle WCP1, the second wavelength converting particle WCP2, and the third wavelength converting particle WCP3 are different from each other, but not limited thereto. For example, the emission colors of the first wavelength converting particle WCP1, the second wavelength converting particle WCP2 and the third wavelength converting particle WCP3 include red, green and blue, respectively, but the emission colors of the first to third wavelength converting particles WCP1, WCP2 and WCP3 of the present invention are not limited thereto. The wavelength conversion particles may be made of fluorescent materials, quantum dot materials, or combinations thereof. For example, when the wavelength converting particles are quantum dots, the quantum dots may emit light of a longer wavelength after absorbing light of a shorter wavelength.

In the present embodiment, the plurality of photoexcitation layers PEL of the plurality of pixel structures PX are connected to each other. More specifically, the photoexcitation layers PEL of the plurality of pixel structures PX may be formed by one-time (or full-surface) coating, but the present invention is not limited thereto. From another point of view, each of the pixel structures PX of the present embodiment is, for example, the first pixel structure PX1 and the second pixel structure PX2 adjacent to each other along the direction X, and the light excitation layer PEL thereof has the first wavelength-converting particle WCP1, the second wavelength-converting particle WCP2 and the third wavelength-converting particle WCP 3. Accordingly, the purpose of simplifying the manufacturing process can be achieved. For example, the light excitation layer PEL including the first to third wavelength conversion particles WCP1, WCP2, WCP3 may be coated in the plurality of pixel areas PA of the display panel 10, such that each pixel structure PX located in the plurality of pixel areas PA includes the first to third wavelength conversion particles WCP1, WCP2, WCP3, that is, the kinds of the wavelength conversion particles in each pixel having the light excitation layer PEL may be the same as each other.

As shown in fig. 2, in the present embodiment, the display panel 10 further includes a light source structure 200 disposed on the second substrate 102. For example, the light source structure 200 includes a light guide plate 210 and a plurality of light sources 220, wherein the light guide plate 210 has a light incident surface 210a and a light emitting surface 210 b. The light source 220 is disposed on one side of the light incident surface 210a of the light guide plate 210, the light guide plate 210 is disposed on the second substrate 102, and the light emitting surface 210b of the light guide plate 210 faces the second substrate 102 (or the first substrate 101). More specifically, the light source 220 is adapted to provide light rays LB, and the light rays LB are transmitted in the light guide plate 210 and transmitted toward the reflective electrode PE of the pixel structure PX through the light emitting surface 210 b. In other words, the light source structure 200 of the present embodiment is substantially a front-light (front-light) of the display panel 10. In this embodiment, the light source 220 may emit light LB having a specific wavelength or a specific wavelength range to excite the first to third wavelength-converting particles WCP1, WCP2, and WCP3 according to absorption spectra of the first to third wavelength-converting particles WCP1, WCP2, and WCP3 in the photoexcited layer PEL, so that when the light LB of the light source 220 is transmitted to the photoexcited layer PEL, the light source may excite the first to third wavelength-converting particles WCP1, WCP2, and WCP3 in the photoexcited layer PEL to emit light of the first to third colors, respectively. In this embodiment, the wavelength of the light of the first color is greater than the wavelength of the light of the second color, and the wavelength of the light of the second color is greater than the wavelength of the light of the third color. For example, the light of the first to third colors may be red light, green light and blue light, respectively, but the first to third colors of the present invention are not limited thereto.

For example, the wavelength of the light beam LB emitted by the light source 220 may be smaller than the wavelength of the light beam of the third color, and the wavelength conversion particles of the light excitation layer PEL located between the display medium layer DML and the reflective electrode PE can excite the light beams of the first to third colors under the irradiation of the light beam LB. For example, when the third color is blue, the light ray LB may be ultraviolet light, but not limited thereto. When the light ray LB is visible light, each pixel may display a mixed color of the light ray LB and the first to third colors; when the light ray LB is non-visible light (e.g., ultraviolet light), each pixel may display a mixed color of the first to third colors. In addition, since each of the first to third colors of light emitted after the first to third wavelength converting particles WCP1, WCP2 and WCP3 are excited has a narrow emission spectrum, that is, a full width at Half Maximum (FWHM) of the emission spectrum is narrow, the color purity of the color displayed by the pixel is high. For example, when the light LB emitted from the light source 220 is ultraviolet light to excite the first to third wavelength conversion particles WCP1, WCP2, and WCP3 to generate red light, green light, and blue light, respectively, white light with better quality can be mixed, but not limited thereto. The present invention can select which of the first color, the second color, and the third color is according to the color to be displayed by the pixel, and select the kinds of the first to third wavelength-converting particles WCP1, WCP2, WCP3 accordingly.

In the first embodiment described above, the photoexcitation layer PEL includes three kinds of wavelength-converting particles, for example, first to third wavelength-converting particles WCP1, WCP2, WCP3, whose emission colors are first to third colors, respectively. However, the present invention is not limited thereto, and according to the variation of the first embodiment, the kinds of the wavelength conversion particles in the photo-excitation layer PEL may be one, two, or more than or equal to four, that is, according to the variation of the first embodiment and the first embodiment, the photo-excitation layer PEL of one pixel structure PX may include at least one kind of the wavelength conversion particles, and the kinds of the wavelength conversion particles in each pixel having the photo-excitation layer may be the same as each other.

In an embodiment where the types of the wavelength conversion particles in the light excitation layer PEL of one pixel structure PX are four or more, the light rays LB of the light source 220 have a specific wavelength or a specific wavelength range to excite the four or more wavelength conversion particles to generate corresponding four or more colors of light. When the light ray LB is visible light, each pixel may display a mixed color of the light ray LB and the four or more colors; when the light ray LB is non-visible light (e.g., ultraviolet light), each pixel may display a mixed color of the above four colors or more. For example, the light excitation layer PEL of each pixel structure PX includes only four wavelength converting particles that can be excited to generate red light, yellow light, green light, and blue light, respectively, and each pixel can display a mixed color of red, yellow, green, and blue when the light LB is non-visible light having a wavelength less than that of the blue light, for example, the light LB is ultraviolet light.

In an embodiment where the types of the wavelength conversion particles in the light excitation layer PEL of one pixel structure PX are two, for example, the light excitation layer PEL of one pixel structure PX includes only two wavelength conversion particles of the first to third wavelength conversion particles WCP1, WCP2, WCP3, and the light LB of the light source 220 has a specific wavelength or a specific wavelength range to excite the two wavelength conversion particles to generate light of corresponding two colors. When the light ray LB is visible light, each pixel may display a color of the light ray LB and a mixed color of the two colors; when the light ray LB is non-visible light (e.g., ultraviolet light), each pixel may display a mixed color of the above two colors. For example, the light excitation layer PEL of each pixel structure PX includes only the first and second wavelength converting particles WCP1, WCP2, the first and second wavelength converting particles WCP1, WCP2 may be excited to generate red light and green light, respectively, and each pixel may display a mixed color of red, green, and blue when the light ray LB is visible light having a wavelength less than that of the green light, for example, the light ray LB is blue light; when the light ray LB is non-visible light having a wavelength less than green, for example, the light ray LB is ultraviolet light, each pixel may display a mixed color of red and green.

In an embodiment where the kind of the wavelength conversion particles in the light excitation layer PEL of one pixel structure PX is one, for example, the light excitation layer PEL of one pixel structure PX includes only one of the first to third wavelength conversion particles WCP1, WCP2, WCP3, and the light LB of the light source 220 has a specific wavelength or a specific wavelength range to excite the one wavelength conversion particle to generate a corresponding one of the colors of light. When the light ray LB is visible light, each pixel may display a mixed color of the light ray LB and the one color; when the light ray LB is non-visible light (e.g., ultraviolet light), each pixel may display one of the colors. For example, the light excitation layer PEL of each pixel structure PX includes only the first wavelength converting particles WCP1, the first wavelength converting particles WCP1 may be excited to respectively generate red light, and each pixel may display a mixed color of red and green or a mixed color of red and blue when the light ray LB is visible light having a wavelength less than red, such as the light ray LB green light or blue light; when the light ray LB is invisible light having a wavelength smaller than red, for example, the light ray LB is ultraviolet light, each pixel may display red.

In the first embodiment and the variation of the first embodiment, the kind of the wavelength conversion particles in the photo excitation layer PEL of each pixel structure PX can be selected according to the color displayed by the pixel, so that a color filter layer is not required to be disposed in the first embodiment and the variation of the first embodiment, and the color purity of the color displayed by the pixel is high.

It should be noted that, by the arrangement of the light source structure 200 and the light excitation layer PEL, the color quality of the display panel 10 can be effectively increased. In addition, because the light-activated layer PEL is disposed on the reflective electrode PE, when the light beam LB emitted from the light source 220 is incident on the light-activated layer PEL, a portion of the light beam LB can be absorbed by the wavelength conversion particles to emit light beams of corresponding colors, and another portion of the light beam LB that is not absorbed by the wavelength conversion particles can be reflected by the reflective electrode PE to reach the light-activated layer PEL again and possibly be absorbed by the wavelength conversion particles to emit light beams of corresponding colors, so that the efficiency of the light beam LB absorbed by the wavelength conversion particles can be increased to improve the picture quality of the display panel 10. On the other hand, when the display panel 10 is in a standby state, displays a special image or the external environment light EB is sufficient, the light sources 220 of the light source structure 200 can be turned off to achieve the power saving effect.

Fig. 3 is a schematic top view of a display panel according to a second embodiment of the invention, and fig. 4 is a schematic partial cross-sectional view of the display panel of fig. 3. For example, fig. 4 is a schematic cross-sectional view of the first to third pixel structures PX1-A, PX2-A, PX3-a respectively located in the pixel columns PR1, PR2 and PR3 in fig. 3. On the other hand, fig. 3 only shows the first substrate 101, the light source 220, the scanning lines GL, the data lines DL, the reflective electrodes, and the light excitation layer of fig. 4 for the sake of clarity.

Referring to fig. 3 and 4, the difference between the display panel 11 of the present embodiment and the display panel 10 of the first embodiment (fig. 1 and 2) and the variation of the first embodiment is as follows: the arrangement of the light excitation layers of the pixel structures is different. Specifically, the photoexcitation layer PEL in one pixel (i.e., the photoexcitation layer PEL located in one pixel region PA) of the first embodiment and the variation of the first embodiment includes at least one type of wavelength conversion particles, and the types of the wavelength conversion particles in each pixel having the photoexcitation layer may be the same as each other, that is, the types of the wavelength conversion particles in the photoexcitation layers in two pixels adjacent in any one direction may be the same as each other; however, there is only one kind of wavelength conversion particles in the optical excitation layer in one pixel of the present embodiment, and the kinds of wavelength conversion particles in the optical excitation layers in two pixels adjacent to each other along one direction may be different from each other.

In the present embodiment, the plurality of pixel structures of the display panel 11 include a first pixel structure PX1-a, a second pixel structure PX2-a, and a third pixel structure PX3-a, the photo-excitation layer PEL1 of the first pixel structure PX1-a includes at least one first wavelength-converting particle WCP1, the photo-excitation layer PEL2 of the second pixel structure PX2-a includes at least one second wavelength-converting particle WCP2, the photo-excitation layer PEL3 of the third pixel structure PX3-a includes at least one third wavelength-converting particle WCP3, and the light emitting wavelengths of the first wavelength-converting particle WCP1, the second wavelength-converting particle WCP2, and the third wavelength-converting particle WCP3 are different from each other. For example, the light emitting colors of the first, second and third wavelength conversion particles WCP1, WCP2 and WCP3 include a first color, a second color and a third color, respectively, the wavelength of the light of the first color is greater than that of the light of the second color, and the wavelength of the light of the second color is greater than that of the light of the third color. For example, the first to third colors may be red, green and blue, respectively, but not limited thereto.

It should be noted that, in the present embodiment, the types of the wavelength converting particles of the light excitation layers of the plurality of pixel structures between two adjacent data lines DL are the same, the light excitation layers of any two adjacent pixel structures in the plurality of pixel structures may be connected to each other, and two light excitation layers adjacent to each other in the direction X have different types of wavelength converting particles. That is, the vertical projection of the light excitation layers on the first substrate 101 is in a long shape extending along the direction Y, and each of the light excitation layers in the long shape is overlapped with the corresponding pixel row, but the invention is not limited thereto. In some embodiments, the photoactive layers of any two adjacent pixel structures in the plurality of pixel structures between two adjacent data lines DL may not be connected to each other, that is, a plurality of block-shaped photoactive layers are disposed between two adjacent data lines DL. As shown in fig. 3, the plurality of pixel structures of the display panel 11 are arranged in a plurality of pixel columns along the direction Y, such as a pixel column PR1, a pixel column PR2 and a pixel column PR3, each pixel column extends along the direction Y, and the plurality of pixel columns are arranged along the direction X. The plurality of light excitation layers of the display panel 11, such as the light excitation layer PEL1, the light excitation layer PEL2, and the light excitation layer PEL3, are arranged along the direction X, and each light excitation layer extends along the direction Y to form a long light excitation layer, but the present invention is not limited thereto. The longitudinal strips of the photo-active layers are respectively overlapped with the pixel rows, for example, the photo-active layer PEL1, the photo-active layer PEL2 and the photo-active layer PEL3 are respectively overlapped with the pixel row PR1, the pixel row PR2 and the pixel row PR 3. Specifically, the light excitation layer PEL1, the light excitation layer PEL2 and the light excitation layer PEL3 can be made by multiple (or divisional) coating, but the invention is not limited thereto. In the embodiment, the light LB from the light source 220 may be transmitted to the light excitation layers PEL1, PEL2, and PEL3 to excite the first to third wavelength conversion particles WCP1, WCP2, and WCP3 and generate the first to third colors of light. In other embodiments, the types of the wavelength conversion particles of the light excitation layers of the plurality of pixel structures between two adjacent scan lines GL may be the same as each other. The light excitation layers of any two adjacent pixel structures in the plurality of pixel structures may be connected to each other, and two light excitation layers adjacent in the direction Y have different kinds of wavelength conversion particles. That is, the vertical projection of the light excitation layers on the first substrate 101 is in a long shape extending along the direction X, and each of the light excitation layers in the long shape overlaps with a corresponding pixel row.

In the embodiment, the wavelength of the light beam LB emitted by the light source 220 may be smaller than the wavelength of the light beam of the third color (for example, when the third color is blue, the light beam LB may be, for example, ultraviolet light), and the first to third wavelength conversion particles WCP1, WCP2, and WCP3 of the light excitation layer PEL1, PEL2, and PEL3 may respectively excite the light beams of the first to third colors, for example, red, green, and blue light beams, under the irradiation of the light beam LB, but not limited thereto. For example, when the light beam LB emitted by the light source 220 is ultraviolet light, the light beam LB emitted by the light source 220 excites the first wavelength conversion particles WCP1 of the first pixel structure PX1-a to generate red light, excites the second wavelength conversion particles WCP2 of the second pixel structure PX2-a to generate green light, and excites the third wavelength conversion particles WCP3 of the third pixel structure PX3-a to generate blue light, so that the pixel rows PR1, PR2, and PR3 respectively display red, green, and blue colors, and thus the display panel 11 can display color images without a color filter layer, but not limited thereto.

In the second embodiment, the display panel 11 includes three different light excitation layers PEL1, PEL2, PEL3, and the first to third wavelength conversion particles WCP1, WCP2, and WCP3, and the light emission colors thereof are the first to third colors, respectively.

However, the present invention is not limited thereto,

fig. 5 is a schematic top view of a display panel according to a first variation of the second embodiment of the present invention, and fig. 6 is a schematic partial cross-sectional view of the display panel of fig. 5. For example, fig. 6 is a schematic cross-sectional view of the first to third pixel structures PX1-A, PX2-A, PX3-a1 respectively located in the pixel columns PR1, PR2, and PR3 in fig. 5. On the other hand, fig. 5 only shows the first substrate 101, the light source 220, the scanning lines GL, the data lines DL, the reflective electrodes, and the light excitation layer of fig. 6 for the sake of clarity.

According to the first variation of the second embodiment, the display panel 11a may only include two kinds of light excitation layers PEL1, PEL2, which respectively include the first and second wavelength conversion particles WCP1, WCP2, which respectively emit light with the first and second colors. In the first variation, the light LB of the light source 220 may excite the first and second wavelength conversion particles WCP1 and WCP2 in the light excitation layers PEL1 and PEL2 to emit light of first and second colors, such as red light and green light, respectively, but not limited thereto. The light LB emitted from the light source 220 may have a wavelength smaller than that of the light of the second color (for example, when the second color is green, the light LB may be blue), and the light-activated layers PEL1 and PEL2 may respectively activate the light of the first color and the light of the second color under the irradiation of the light LB. For example, in the first variation of the second embodiment, the first pixel structure PX1-a of the pixel row PR1 and the second pixel structure PX2-a of the pixel row PR2 have the photo-excitation layer PEL1 and the photo-excitation layer PEL2, respectively, and the third pixel structure PX3-a1 of the pixel row PR3 does not have the photo-excitation layer, so when the light LB emitted by the light source 220 is blue light, the pixel row PR1 and the pixel row PR2 can excite red light and green light, respectively, and the blue light LB is reflected from the reflective electrode PE of the third pixel structure PX3-a1 of the pixel row PR3, so that the pixel rows PR1, PR2, and PR3 can display red light, green light, and blue light, respectively, and the display panel of the first variation can display a color picture without providing a color filter layer, but the invention is not limited thereto.

According to the second embodiment and the first variation of the second embodiment, the display panel includes a plurality of pixels, at least some of the pixels have the light excitation layer PEL, the kinds of the wavelength conversion particles in each of the pixels having the light excitation layer are one, and the kinds of the wavelength conversion particles in the light excitation layers in two pixels adjacent in one direction may be different from each other. However, the present invention is not limited thereto, and according to a second variation of the second embodiment, the display panel includes a plurality of pixels, at least some of which have the light excitation layer PEL, among which the kinds of the wavelength conversion particles in the light excitation layer PEL (that is, the light excitation layer PEL located in one pixel area PA) of each of at least one pixel are at least two, and the kinds of the wavelength conversion particles in the light excitation layers in two pixels adjacent in one direction may be partially different or completely different from each other. For example, the types of the wavelength conversion particles in the light excitation layer PEL1 of the first pixel structure PX1-a in fig. 3 and 4 (or fig. 5 and 6) can be changed into two, for example, the light excitation layer PEL1 includes the first wavelength conversion particle WCP1 and the second wavelength conversion particle WCP2, or includes the first wavelength conversion particle WCP1 and the fourth wavelength conversion particle, and the light emitting color of the fourth wavelength conversion particle is different from the first to the third colors, but the invention is not limited thereto. For example, when the types of the wavelength converting particles in the light excitation layer PEL1 of the first pixel structure PX1-a in fig. 3 and 4 (or fig. 5 and 6) are changed into two, such as the first and second wavelength converting particles WCP1, WCP2, and the light LB emitted by the light source 220 is ultraviolet light, the light LB emitted by the light source 220 excites the first wavelength converting particles WCP1 and the second wavelength converting particles WCP2 of the first pixel structure PX1-a to generate a mixed light of red light and green light (e.g., yellow light), excites the second wavelength converting particles WCP2 of the second pixel structure PX2-a to generate green light, and excites the third wavelength converting particles WCP3 of the third pixel structure PX3-a to generate blue light, so that the pixel columns PR1, PR2, PR3 display yellow, green, and blue colors, respectively; or when the types of the wavelength converting particles in the light excitation layer PEL1 of the first pixel structure PX1-a in fig. 5 and 6 are changed into two, such as the first and second wavelength converting particles WCP1 and WCP2, and the light LB emitted by the light source 220 is blue light, the light LB emitted by the light source 220 excites the first wavelength converting particles WCP1 and the second wavelength converting particles WCP2 of the first pixel structure PX1-a to generate a mixed light of red light and green light (such as yellow light), excites the second wavelength converting particles WCP2 of the second pixel structure PX2-a to generate green light, and the blue light LB is reflected from the reflective electrode PE of the third pixel structure PX3-a of the pixel row PR3, so that the pixel rows PR1, PR2, PR3 respectively display yellow, green light, and blue light. Therefore, the display panel of the second variation embodiment can display a color image without providing a color filter layer, but is not limited thereto.

It should be noted that, because the half-width of the light emitting spectrum of the light of different colors excited by the wavelength conversion particles is narrow, the color purity of the light generated by the display panel of the second embodiment of the present invention and the first and second variation embodiments of the second embodiment is higher, that is, the quality of the color picture displayed by the display panel of the present invention is better than that of the general reflective display panel.

Fig. 7 is a schematic partial cross-sectional view of a display panel according to a third embodiment of the invention. Referring to fig. 7, the difference between the display panel 12 of the present embodiment and the display panel 10 of fig. 2 is: the composition of the display panel is different. Specifically, the display medium layer DML-a of the display panel 12 includes, but is not limited to, a first cholesteric liquid crystal layer CLC1, a second cholesteric liquid crystal layer CLC2, and a third cholesteric liquid crystal layer CLC3, which are stacked on each other in a direction perpendicular to the first substrate 101. In other embodiments, the number of the cholesteric liquid crystal layers of the display medium layer can also be one, two or more than three. The cholesteric liquid crystal layer has a planar state (planar texture) for reflecting the ambient light EB and a focal-conic texture (focal-conic texture) for scattering the ambient light EB, and can be switched in different states by adjusting the magnitude of the electric field applied to the cholesteric liquid crystal (i.e. by adjusting the voltage applied to the cholesteric liquid crystal), and the cancellation of the electric field after the switching (i.e. the voltage applied to the cholesteric liquid crystal is 0) can still maintain the stable state, i.e. the cholesteric liquid crystal has a bi-stable state, so the display panel 12 has the advantage of power saving.

In the present embodiment, the first, second and third cholesteric liquid crystal layers CLC1, CLC2 and CLC3 have different reflection wavelengths, for example, the cholesteric liquid crystal layers may have different helical pitches (helical pitches) respectively to reflect light with different wavelengths. For example, the first, second and third cholesteric liquid crystal layers CLC1, CLC2 and CLC3 respectively reflect light of a first color, a second color and a third color. In this embodiment, the wavelength of the light of the first color is greater than the wavelength of the light of the second color, and the wavelength of the light of the second color is greater than the wavelength of the light of the third color. For example, the light of the first to third colors may be red light, green light and blue light, respectively, but not limited thereto. When the first to third cholesteric liquid crystal layers CLC1, CLC2, CLC3 are all in a planar state, a portion of the ambient light EB is reflected by the first to third cholesteric liquid crystal layers CLC1, CLC2, CLC3, and the reflected light is a mixed light of a first color light, a second color light, and a third color light, for example, the reflected light is a mixed light of blue light, green light, and red light, that is, the reflected light is white light; when one of the first to third cholesteric liquid crystal layers CLC1, CLC2, CLC3 is in a planar state and the other two are in a non-planar state (e.g., a focal-conic state), a portion of the ambient light EB is reflected by one of the first to third cholesteric liquid crystal layers CLC1, CLC2, CLC3 and the reflected light is one of the first to third colors of light, e.g., the reflected light is one of blue, green, and red; when two of the first to third cholesteric liquid crystal layers CLC1, CLC2, CLC3 are in a planar state and the remaining one is in a non-planar state (e.g., a focal-conic state), a portion of the ambient light EB is reflected by two of the first to third cholesteric liquid crystal layers CLC1, CLC2, CLC3 and the reflected light is a mixed light of two of the first to third colors of light, for example, the reflected light is a mixed light of blue light and green light (e.g., CYAN) or a mixed light of green light and red light (e.g., yellow).

In this embodiment, an isolation layer (not shown) may be disposed between any two adjacent cholesteric liquid crystal layers of the first to third cholesteric liquid crystal layers CLC1, CLC2, and CLC3 to prevent the cholesteric liquid crystal layers with different spiral pitches from mixing with each other, and an electrode layer (not shown) may be disposed on each of the first to third cholesteric liquid crystal layers CLC1, CLC2, and CLC3, and a voltage of the electrode layer may be controlled such that each cholesteric liquid crystal layer has an independently controllable cross-voltage; or any two adjacent cholesteric liquid crystal layers of the first to third cholesteric liquid crystal layers CLC1, CLC2, and CLC3 are in direct contact without an isolation layer, and electrode layers (not shown) are respectively disposed only on the upper and lower sides of the stacked structure of the first to third cholesteric liquid crystal layers CLC1, CLC2, and CLC3, so that the voltage across each of the first to third cholesteric liquid crystal layers CLC1, CLC2, and CLC3 can be adjusted according to a voltage division principle (for example, the voltage across the electrode layers and the capacitance and resistance of each of the first to third cholesteric liquid crystal layers CLC1, CLC2, and CLC3 can be adjusted to adjust the voltage across each of the first to third cholesteric liquid crystal layers CLC1, CLC2, and CLC 3). The display medium layer DML-a of the present embodiment includes a cholesteric liquid crystal material, for example, the display medium layer DML-a may include a Polymer Dispersed Liquid Crystal (PDLC) material, and a content ratio of a polymer thereof may be significantly higher than that of the cholesteric liquid crystal material, such that the cholesteric liquid crystal of any one of the first to third cholesteric liquid crystal layers CLC1, CLC2, and CLC3 is surrounded by the polymer, and thus, in a case where no isolation layer is provided, the cholesteric liquid crystals of any two adjacent cholesteric liquid crystal layers of the first to third cholesteric liquid crystal layers CLC1, CLC2, and CLC3 may not be mixed with each other. In other words, the cholesterol liquid crystal layers can be stacked in direct contact, that is, any two adjacent cholesterol liquid crystal layers of the first to third cholesterol liquid crystal layers CLC1, CLC2, CLC3 can be in direct contact without an isolation layer. However, the invention is not limited thereto, and in other embodiments, the cholesteric liquid crystal layer may also be a Polymer Stabilized Cholesteric Texture (PSCT) liquid crystal layer or a Polymer Network Liquid Crystal (PNLC) liquid crystal layer, but is not limited thereto. When the content ratio of the high molecular polymer in the display medium layer is smaller than that of the cholesteric liquid crystal material, an isolation layer may be disposed between any two adjacent cholesteric liquid crystal layers to prevent the cholesteric liquid crystal layers with different spiral pitches from mixing with each other. The present invention does not limit the kind of the cholesterol liquid crystal layer.

Since the cholesteric liquid crystal layer displays a picture by reflecting light, when a user views the picture at some angles, the quality of the picture is poor, that is, there is a limitation on the viewing angle, and therefore, in the present embodiment, the light excitation layer PEL including the first to third wavelength conversion particles WCP1, WCP2, and WCP3 may be disposed between the display medium layer DML-a and the reflective electrode PE to obtain a better viewing angle range by the self-luminous property of the wavelength conversion particles. For example, in the present embodiment, in addition to the purpose of saving power by displaying the image through the way of reflecting light by the cholesteric liquid crystal layer, when a preferred viewing angle range is to be obtained, the states of the first to third cholesteric liquid crystal layers CLC1, CLC2, CLC3 can all be set to a non-planar state (e.g., a focal conic state), so that the light LB emitted by the light source 220 and the incident ambient light EB can pass through the first to third cholesteric liquid crystal layers CLC1, CLC2, CLC3 to reach the photo-excitation layer PELs, and the first to third wavelength conversion particles WCP1, WCP2, WCP3 can be excited to generate the light of the first to third colors, respectively.

Fig. 8 is a schematic partial cross-sectional view of a display panel according to a fourth embodiment of the present invention. The display panel 13 of the present embodiment is different from the display panel 12 of fig. 7 in that: the display panel 13 of the present embodiment does not have the light source structure 200. In the present embodiment, in addition to the purpose of saving power by displaying the image through the way of reflecting light by the cholesteric liquid crystal layer, when a preferred viewing angle range is to be obtained, the states of the first to third cholesteric liquid crystal layers CLC1, CLC2, CLC3 can all be set to a non-planar state (e.g. a focal conic state), so that the incident ambient light EB can pass through the first to third cholesteric liquid crystal layers CLC1, CLC2, CLC3 to reach the photo-excitation layer PEL, because the ambient light EB includes light of a plurality of wavelength segments, and thus a part of the wavelength segments in the ambient light EB can excite the first to third wavelength conversion particles WCP1, WCP2, WCP3 to generate light of the first to third colors, respectively.

In the third and fourth embodiments, the excitation layer PEL of each pixel includes three kinds of wavelength converting particles, for example, first to third wavelength converting particles WCP1, WCP2, WCP3, of which emission colors may be first to third colors, respectively. However, the present invention is not limited thereto, and according to the first variation of the third embodiment and the first variation of the fourth embodiment, the wavelength conversion particle types of the excitation layer PEL of each pixel may be one, two, or greater than or equal to four, that is, according to the first variation of the third embodiment and the third embodiment (or the first variation of the fourth embodiment and the fourth embodiment), the light excitation layer PEL of one pixel may include at least one wavelength conversion particle, and the wavelength conversion particle types in each pixel having the light excitation layer may be the same as each other. For example, the types of the wavelength conversion particles in the light excitation layer PEL are two or one, and for example, the light excitation layer PEL of each pixel only includes two or one wavelength conversion particles of the first to third wavelength conversion particles WCP1, WCP2 and WCP3, so that when the states of the first to third cholesteric liquid crystal layers CLC1, CLC2 and CLC3 are all set to a non-planar state (e.g., a focal-conic state), the light ray LB emitted from the light source 220 and the incident ambient light EB can pass through the first to third cholesteric liquid crystal layers CLC1-A, CLC2-A, CLC3-a to excite the two or one wavelength conversion particles to generate two colors or one color of the first to third colors of light. When the types of the wavelength conversion particles in the light excitation layer PEL are greater than or equal to four, the light rays LB emitted from the light source 220 and the incident ambient light EB can pass through the light rays of the first to third cholesteric liquid crystal layers CLC1-A, CLC2-A, CLC3-a to excite the four or more wavelength conversion particles to generate corresponding four or more colors of light rays.

The kind of the wavelength conversion particles in the photo-excitation layer PEL in one pixel (i.e., the photo-excitation layer PEL located in one pixel area PA) in the third embodiment, the first variation of the third embodiment, the fourth embodiment, and the first variation of the fourth embodiment described above is at least one, and the kind of the wavelength conversion particles in each pixel having the photo-excitation layer may be the same as each other. However, the present invention is not limited thereto. According to a second variation of the third embodiment and the second variation of the fourth embodiment, the display panel includes a plurality of pixels, at least some of the pixels have the light excitation layer PEL, the kinds of the wavelength conversion particles in each of the pixels having the light excitation layer are one, and the kinds of the wavelength conversion particles in the light excitation layers in two pixels adjacent in one direction may be different from each other. However, the present invention is not limited thereto. According to a third variation of the third embodiment and a third variation of the fourth embodiment, the display panel includes a plurality of pixels, at least some of the pixels have the light excitation layer PEL, among the at least some pixels, the kinds of the wavelength conversion particles in the light excitation layer PEL (that is, the light excitation layer PEL located in one pixel area PA) of each of at least one pixel are at least two, and the kinds of the wavelength conversion particles in the light excitation layers in two pixels adjacent in one direction may be partially different or completely different from each other.

Fig. 9 is a schematic top view of a display panel according to a fifth embodiment of the invention. Fig. 10 is a partial cross-sectional schematic view of the display panel of fig. 9. In particular, for the sake of clarity, fig. 9 only shows the first substrate 101, the light source 220, the scanning line GL, the data line DL, the reflective electrode and the cholesteric liquid crystal layer of fig. 10. Referring to fig. 9 and 10, the difference between the display panel 14 of the present embodiment and the display panel 12 of fig. 7 is: the cholesterol liquid crystal layers of the display medium layer are arranged in different modes. Specifically, in the third embodiment, the first to third modified embodiments of the third embodiment, the fourth embodiment, and the first to third modified embodiments of the fourth embodiment, the number of the cholesterol liquid crystal layers in the display medium layer DML-a of each pixel is at least one, the display medium layers DML-a in all the pixels of the display panel are identical to each other, and when the number of the cholesterol liquid crystal layers is plural, the plural cholesterol liquid crystal layers are stacked in a direction perpendicular to the first substrate 101. In the fifth embodiment, the vertical projections of the cholesteric liquid crystal layers of the display medium layer DML-B on the first substrate 101 may not overlap each other. More specifically, when the display panel 14 is viewed from a direction perpendicular to the first substrate 101, the first cholesterol liquid crystal layer CLC1-a is adjacent to the second cholesterol liquid crystal layer CLC2-a, the second cholesterol liquid crystal layer CLC2-a is adjacent to the third cholesterol liquid crystal layer CLC3-a, that is, a vertical projection of the first cholesterol liquid crystal layer CLC1-a on the first substrate 101 is adjacent to a vertical projection of the second cholesterol liquid crystal layer CLC2-a on the first substrate 101, and a vertical projection of the second cholesterol liquid crystal layer CLC2-a on the first substrate 101 is adjacent to a vertical projection of the third cholesterol liquid crystal layer CLC3-a on the first substrate 101. In the fifth embodiment, the cholesterol liquid crystal layers of a plurality of pixels between two adjacent data lines DL are identical to each other, and two pixels adjacent in the direction X have cholesterol liquid crystal layers of different spiral pitches, but the present invention is not limited thereto. For example, the display panel 14 includes a plurality of pixel columns arranged along the direction X, and a plurality of pixel structures in each pixel column are arranged along the direction Y, and the first to third cholesteric liquid crystal layers CLC1-A, CLC2-A, CLC3-a respectively overlap the corresponding pixel columns. As shown in fig. 9, the display panel 13 includes pixel rows PR1, PR2, and PR3, and the first to third cholesteric liquid crystal layers CLC1-A, CLC2-A, CLC3-a overlap the pixel rows PR1, PR2, and PR3, respectively. In other embodiments, the cholesteric liquid crystal layers of the pixels between two adjacent scanning lines GL may be the same as each other, and two pixels adjacent in the direction Y have cholesteric liquid crystal layers with different spiral pitches, but the invention is not limited thereto.

In the present embodiment, the plurality of pixel structures of the display panel 14 include a first pixel structure PX1-B, a second pixel structure PX2-B, and a third pixel structure PX3-B, and the first cholesterol liquid crystal layer CLC1-a, the second cholesterol liquid crystal layer CLC2-a, and the third cholesterol liquid crystal layer CLC3-a overlap the first pixel structure PX1-B, the second pixel structure PX2-B, and the third pixel structure PX3-B, respectively, in a direction perpendicular to the first substrate 101. In the present embodiment, the spiral pitch of the first cholesterol liquid crystal layer CLC1-a is different from the spiral pitch of the second cholesterol liquid crystal layer CLC2-a, the spiral pitch of the second cholesterol liquid crystal layer CLC2-a is different from the spiral pitch of the third cholesterol liquid crystal layer CLC3, the first cholesterol liquid crystal layer CLC1-a, the second cholesterol liquid crystal layer CLC2-a and the third cholesterol liquid crystal layer CLC3-a are respectively configured to reflect light of a first color, light of a second color and light of a third color, and the first to third colors are different from each other. For example, the spiral pitch of the first cholesteric liquid crystal layer CLC1-a may be greater than the spiral pitch of the second cholesteric liquid crystal layer CLC2-a, the spiral pitch of the second cholesteric liquid crystal layer CLC2-a may be greater than the spiral pitch of the third cholesteric liquid crystal layer CLC3, the wavelength of the light of the first color (e.g., red light) is greater than the wavelength of the light of the second color (e.g., green light), and the wavelength of the light of the second color (e.g., green light) is greater than the wavelength of the light of the third color (e.g., blue light), but not limited thereto.

In the present embodiment, the first cholesterol liquid crystal layer CLC1-a, the second cholesterol liquid crystal layer CLC2-a, and the third cholesterol liquid crystal layer CLC3-a are respectively overlapped with one of the first to third pixel structures PX1-B, PX2-B, PX3-B, and the cross-pressure of the first cholesterol liquid crystal layer CLC1-a, the cross-pressure of the second cholesterol liquid crystal layer CLC2-a, and the cross-pressure of the third cholesterol liquid crystal layer CLC3-a are independently adjusted to control the color of the reflected light of the first to third cholesterol liquid crystal layers CLC1-A, CLC2-A, CLC3-a of each pixel, but the present invention is not limited thereto. In addition, the display panel 14 further includes a light excitation layer PEL1, PEL2, PEL3 respectively disposed between the first cholesteric liquid crystal layer CLC1-a and the reflective electrode PE1 of the first pixel structure PX1-B, between the second cholesteric liquid crystal layer CLC2-a and the reflective electrode PE2 of the second pixel structure PX2-B, and between the third cholesteric liquid crystal layer CLC3-a and the reflective electrode PE3 of the third pixel structure PX3-B, and each of the light excitation layers PEL1, PEL2, and PEL3 includes first to third wavelength conversion particles WCP1, WCP2, WCP3 to obtain a preferred viewing angle range by the self-luminous characteristics of the wavelength conversion particles. For example, when a preferred viewing angle range is to be obtained, the states of the first to third cholesteric liquid crystal layers CLC1, CLC2, CLC3 can be set to a non-planar state (e.g., a focal conic state), so that light emitted from the light source 220 and incident ambient light can pass through the first to third cholesteric liquid crystal layers CLC1-A, CLC2-A, CLC3-a to reach the corresponding photo-excitation layers PEL1, PEL2, PEL3, and the first to third wavelength conversion particles WCP1, WCP2, WCP3 can be excited to generate light of the first to third colors, respectively.

In the above-described fifth embodiment, each of the photoexcitation layers PEL1, PEL2, PEL3 includes three kinds of wavelength-converting particles, such as first to third wavelength-converting particles WCP1, WCP2, WCP3, which emit light of first to third colors, such as red, green, and blue, respectively. However, the present invention is not limited thereto, and according to the first variation of the fifth embodiment, the kinds of the wavelength converting particles of the excitation layer of each pixel may be one, two, or more than or equal to four, that is, according to the fifth embodiment and the first variation of the fifth embodiment, the light excitation layer of one pixel structure PX may include at least one kind of the wavelength converting particles, and the kinds of the wavelength converting particles in each pixel having the light excitation layer may be the same as each other. For example, when the types of the wavelength converting particles in the light excitation layer are two or one, for example, the light excitation layer of each pixel includes only two or one of the first to third wavelength converting particles WCP1, WCP2 and WCP3, so that when the states of the first to third cholesteric liquid crystal layers CLC1, CLC2 and CLC3 are all set to a non-planar state (e.g., a focal-conic state), the light emitted from the light source 220 and the incident ambient light can pass through the first to third cholesteric liquid crystal layers CLC1-A, CLC2-A, CLC3-a to excite the two or one wavelength converting particles to generate corresponding two or one color light. When the types of the wavelength conversion particles in the light excitation layer are equal to or greater than four, the light emitted from the light source 220 and the incident ambient light can pass through the first to third cholesteric liquid crystal layers CLC1-A, CLC2-A, CLC3-a to excite the four or more wavelength conversion particles to generate corresponding four or more colors of light. .

The kind of the wavelength conversion particles in the photo-excitation layer in one pixel (i.e., the photo-excitation layer located in one pixel area PA) in the above-described fifth embodiment and the first variation of the fifth embodiment is at least one, and the kinds of the wavelength conversion particles in the photo-excitation layer in each pixel may be the same as each other. However, the present invention is not limited thereto. According to a second variation of the fifth embodiment, the display panel includes a plurality of pixels, at least some of the plurality of pixels have the light excitation layer, the kinds of the wavelength conversion particles in each of the pixels having the light excitation layer are one, and the kinds of the wavelength conversion particles in the light excitation layers in two pixels adjacent in one direction may be different from each other. However, the present invention is not limited thereto. According to a third variation of the fifth embodiment, the display panel includes a plurality of pixels, at least some of the pixels have a light excitation layer, among the at least some pixels, the kinds of the wavelength converting particles in the light excitation layer (i.e., the light excitation layer located in one pixel area PA) of each of at least one pixel are at least two, and the kinds of the wavelength converting particles in the light excitation layers in two pixels adjacent in one direction may be partially different or completely different from each other.

In addition, in some embodiments, the light source structure 200 in the fifth embodiment, the first variation of the fifth embodiment, the second variation of the fifth embodiment, and the third variation of the fifth embodiment may be removed, that is, the display panel does not have the light source structure 200.

In summary, through the arrangement of the cholesteric liquid crystal layer, the light excitation layer and the light source structure, the characteristic that the cholesteric liquid crystal layer reflects light can be utilized to achieve the purpose of saving power, and when a better viewing angle and/or displaying a color picture are to be obtained, the state of the cholesteric liquid crystal layer can be set to a light penetration state, so that light emitted by the light source and incident ambient light can penetrate through the cholesteric liquid crystal layer to excite the wavelength conversion particles in the light excitation layer to generate light of a corresponding color. Furthermore, in some embodiments, no light source structure may be provided.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A display panel, comprising:

a first substrate and a second substrate disposed opposite to each other;

the display medium layer is arranged between the first substrate and the second substrate;

a plurality of pixel structures disposed on the first substrate, each of the pixel structures including a reflective electrode and a light excitation layer, wherein the reflective electrode overlaps the light excitation layer, and the reflective electrode is located between the light excitation layer and the first substrate; and

and the light source structure is arranged on the second substrate.

2. The display panel of claim 1, wherein the light source structure comprises:

the light guide plate is provided with a light emergent surface and a light incident surface, and the light emergent surface faces the second substrate; and

the light source is arranged on one side of the light incident surface of the light guide plate.

3. The display panel of claim 1, wherein the light excitation layer comprises at least one first wavelength conversion particle and at least one second wavelength conversion particle, the first wavelength conversion particle and the second wavelength conversion particle respectively generate a first light and a second light after being irradiated by the light source structure, and a color of the first light is different from a color of the second light.

4. The display panel of claim 1, wherein the pixel structures include a first pixel structure and a second pixel structure, wherein the light excitation layer of the first pixel structure includes at least one first wavelength conversion particle, the light excitation layer of the second pixel structure includes at least one second wavelength conversion particle, the first wavelength conversion particle and the second wavelength conversion particle respectively generate a first light and a second light after being irradiated by the light source structure, and a color of the first light is different from a color of the second light.

5. The display panel according to claim 4, wherein the first light has a color of red and the second light has a color of green.

6. The display panel according to claim 4, wherein the first light has a wavelength longer than that of the second light, and the light emitted from the light source structure comprises light having a wavelength shorter than that of the second light.

7. The display panel of claim 6, wherein the light emitted by the light source structure comprises blue light or ultraviolet light.

8. The display panel according to claim 4, wherein the plurality of pixel structures further includes a third pixel structure, wherein the light excitation layer of the third pixel structure includes at least one third wavelength conversion particle, the third wavelength conversion particle generates a third light after being irradiated by the light source structure, and a color of the third light is different from colors of the first light and the second light.

9. The display panel according to claim 8, wherein the color of the first light, the color of the second light and the color of the third light are red, green and blue, respectively.

10. The display panel of claim 8, wherein the first light has a wavelength longer than that of the second light, the second light has a wavelength longer than that of the third light, and the light emitted by the light source structure comprises light having a wavelength shorter than that of the third light.

11. The display panel of claim 10, wherein the light emitted by the light source structure comprises ultraviolet light.