Display panel and display device

Abstract

The invention discloses a display panel and a display device. The display panel comprises a transverse waveguide, a turning grating and a coupling-out grating which are sequentially arranged from top to bottom. The transverse waveguide is composed of four faces, the first face is parallel to the second face, and the third face is parallel to the fourth face. A coupling-in grating is arranged on the end side of the first surface, and the third surface is in butt joint with the turning grating; light enters from the coupling-in grating, is transversely transmitted in the transverse waveguide, is transmitted to the turning grating through the third surface, and is emitted from the coupling-out grating. The coupling-in grating is arranged on the end side of the transverse waveguide, light enters from the coupling-in grating and then is transversely propagated, even if long-distance propagation is carried out, the turning grating can be very small, the size of the coupling-out grating on a panel with the same area can be very large, and use of a user is facilitated.

Description

Technical Field

[0001] This invention relates to the field of AR display technology, and in particular to a display panel and display device. Background Technology

[0002] With the development of display technology, people have increasingly higher requirements for the display quality of display devices. Previous AR display panels, due to their long propagation distances, required very large extended transition grating sizes, resulting in very small coupling areas, which is detrimental to user experience.

[0003] In summary, there is a lack of user-friendly display panels and display devices in the existing technology.

[0004] It should be noted that the information disclosed in the background section above is only for understanding the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. It should be noted that the information disclosed in the background section above is only for understanding the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] The present invention provides a display panel and a display device that can solve at least one problem in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A display panel includes a transverse waveguide, a transition grating, and a coupling grating arranged sequentially from top to bottom; the transverse waveguide consists of four surfaces, with the first and second surfaces parallel, and the third and fourth surfaces parallel; a coupling grating is disposed on the end side of the first surface, and the third surface is connected to the transition grating; light enters from the coupling grating and is transversely transmitted within the transverse waveguide, and is transmitted through the third surface to the transition grating, and exits from the coupling grating.

[0007] Preferably, the third surface is coated with a film having a gradient transmittance.

[0008] Preferably, the transmittance of the coating on the third surface located below the coupling grating is the initial transmittance, and the transmittance is 100% at the position L furthest from the coupling grating on the third surface; the transmittance of the coating on the third surface is: T = (1-a) / L*x + a Where x is the distance from a point on the third surface to a point directly below the center point of the coupling grating, T is the transmittance of the coating on the third surface, and L is the total length of the transverse waveguide.

[0009] Preferably, the grating period d11 of the coupled grating, the grating period d12 of the transition grating, and the grating period d13 of the coupled grating have a vector sum of 0 in the K-space structure, forming a closed loop.

[0010] Preferably, the grating period d11 of the coupled grating, the grating period d12 of the folding grating, and the grating period d13 of the coupled grating form a triangular grating.

[0011] Preferably, the grating period d11 of the coupled grating, the grating period d12 of the bend grating, and the grating period d13 of the coupled grating are the same; and the angle between the grating direction of the coupled grating and the horizontal direction is θ1=30°, the angle between the grating direction of the bend grating and the horizontal direction is θ2=30°, and the grating direction of the coupled grating is the vertical direction.

[0012] Preferably, the lateral waveguide comprises two waveguide layers: a first lateral waveguide and a second lateral waveguide, with the coupling grating evenly disposed on both layers. The contact surface between the first and second lateral waveguides is the bottom surface of the first lateral waveguide, with a first portion of the bottom surface being the part away from the coupling grating and a second portion being the remaining portion. The first portion is coated with a gradient transmission film; the second portion is coated with a total reflection film. The contact surface between the second lateral waveguide and the transition grating is the ground surface of the second lateral waveguide, with a third portion of the bottom surface being the part away from the coupling grating and a fourth portion being... The remaining portion; the third portion is coated with a fully transmissive film; the fourth portion is coated with a gradient transmissive film; light enters the first transverse waveguide and the second transverse waveguide from the coupled grating for transverse transmission; light is transversely transmitted in the first transverse waveguide by total internal reflection through the second portion of the bottom surface of the first transverse waveguide, and then undergoes gradient transmission through the first portion to the second transverse waveguide; light is split into two paths through the fourth portion of the second transverse waveguide, one part is transmitted into the transition grating, and the other part is reflected in the second transverse waveguide for transverse transmission; and then enters the transition grating through the third portion with full transmission.

[0013] Preferably, the width ratio of the first transverse waveguide to the second transverse waveguide is 4:6 to 6:4; the ratio of the first part and the second part of the first transverse waveguide is 4:6 to 6:4; and the ratio of the third part and the fourth part of the second transverse waveguide is 4:6 to 6:4.

[0014] Preferably, the lateral waveguide comprises three waveguide layers: a third lateral waveguide, a fourth lateral waveguide, and a fifth lateral waveguide; the coupling grating is evenly disposed on the third, fourth, and fifth lateral waveguides; the contact surface between the third and fourth lateral waveguides is the bottom surface of the third lateral waveguide, the fifth portion of the bottom surface of the third lateral waveguide is the portion away from the coupling grating, and the sixth portion is the remaining portion; the fifth portion is coated with a gradient transmission film; the sixth portion is coated with a total reflection film; the contact surface between the fourth and fifth lateral waveguides is the bottom surface of the fourth lateral waveguide, the seventh portion of the bottom surface of the fourth lateral waveguide is the portion away from the coupling grating, the portion close to the coupling grating is the ninth portion, and the eighth portion is the remaining portion; the seventh portion is coated with a total transmission film, the eighth portion is coated with a gradient transmission film, and the ninth portion is coated with a total reflection film; the contact surface between the fifth lateral waveguide and the turning grating is the ground surface of the fifth lateral waveguide. The tenth portion of the bottom surface of the fifth transverse waveguide is the portion away from the coupling grating, and the eleventh portion is the remaining portion; the tenth portion is coated with a total transmission film; the eleventh portion is coated with a gradient transmission film; light enters the third transverse waveguide, the fourth transverse waveguide, and the fifth transverse waveguide from the coupling grating for transverse transmission; light undergoes total internal reflection at the sixth portion of the third transverse waveguide for transverse transmission within the third transverse waveguide, and undergoes gradient transmission through the fifth portion to the fourth transverse waveguide; light undergoes total internal reflection at the ninth portion of the fourth transverse waveguide for transverse transmission within the fourth transverse waveguide, undergoes gradient transmission through the eighth portion, and undergoes total transmission through the seventh portion to the fifth transverse waveguide; light is split into two paths at the eleventh portion of the fifth transverse waveguide, one part is transmitted into the transition grating, and the other part is reflected within the fifth transverse waveguide for transverse transmission; and then undergoes total transmission through the tenth portion into the transition grating.

[0015] Preferably, the transverse waveguide and the folding grating are either separately configured or integrally formed.

[0016] The present invention also provides a display device, including a display panel as described above.

[0017] The present invention has the following beneficial effects: This invention provides a coupling grating at the end of a transverse waveguide. Light enters through the coupling grating and propagates laterally. Even for long-distance propagation, the grating can be very small, resulting in a very large coupling grating size on a panel of the same area, which is beneficial for users. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a display panel according to an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the coating transmittance of the lateral waveguide of a display panel according to an embodiment of the present invention.

[0020] Figure 3 This is a schematic diagram of the grating structure of a display panel according to an embodiment of the present invention.

[0021] Figure 4 This is a schematic diagram of the grating structure of another display panel according to an embodiment of the present invention.

[0022] Figure 5 This is a schematic diagram of the grating structure of another display panel according to an embodiment of the present invention.

[0023] Figure 6 This is a schematic diagram of another display panel according to an embodiment of the present invention.

[0024] Figure 7 This is a schematic diagram of the coating transmittance of the lateral waveguide of a display panel according to another embodiment of the present invention.

[0025] Figure 8 This is a schematic diagram of another display panel according to an embodiment of the present invention.

[0026] Figure 9 This is a schematic diagram of the coating transmittance of the lateral waveguide of a display panel according to another embodiment of the present invention.

[0027] Figure 10 This is a schematic diagram of another display panel according to an embodiment of the present invention.

[0028] Figure 11 This is a schematic diagram of another display panel according to an embodiment of the present invention. Detailed Implementation

[0029] The embodiments of the present invention will be described in detail below. It should be emphasized that the following description is merely exemplary and not intended to limit the scope and application of the present invention. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0030] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as "connected to" another component, it can be directly connected to or indirectly connected to that other component. Furthermore, a connection can be used for fixing, coupling, or communication.

[0031] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of the present invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0033] See Figure 1 An embodiment of the present invention provides a display panel, including a transverse waveguide 1, a transition grating 12, and a coupling grating 13 arranged sequentially from top to bottom; the transverse waveguide 1 is composed of four surfaces, the first surface S1 and the second surface S2 are parallel, and the third surface S3 and the fourth surface S4 are parallel; a coupling grating 11 is arranged on the end side of the first surface S1, and the third surface S3 is connected to the transition grating 12; light enters from the coupling grating 11 and is transversely transmitted in the transverse waveguide 1 and transmitted through the third surface S3 to the transition grating 12, and exits from the coupling grating 13.

[0034] This invention provides a coupling grating at the end of a transverse waveguide. Light enters through the coupling grating and propagates laterally. Even for long-distance propagation, the grating can be very small, resulting in a very large coupling grating size on a panel of the same area, which is beneficial for users.

[0035] It is understood that the transverse waveguide 1 in this invention comprises four parallel surfaces, and the cross-section can be any of a square, rectangle, or parallelogram. A coupling grating 11 is disposed on the left or right end of the transverse waveguide, while the bend grating 12 and coupling grating 13 can be adaptively disposed. In a specific embodiment, the width of the transverse waveguide 1 is 2mm~6mm, the width of the bend grating is 2mm~6mm, and the width of the output grating is 100mm~500mm; the length of the panel is 200mm~600mm, and the thickness is 0.5mm~2mm.

[0036] In one embodiment of the present invention, a coating with gradient transmittance is deposited on the third surface S3. After light enters from the coupling grating 11, it travels along the transverse waveguide 1, but the light intensity becomes weaker as it propagates towards the other end of the transverse waveguide 1. The gradient coating on the third surface S3 is to make the light exiting from the third surface S3 approximately uniform when it is emitted outward from the coupling grating 13.

[0037] like Figure 2 As shown, the transmittance of the coating on the third surface S3 below the coupling grating 11 is the initial transmittance a. At the position L furthest from the coupling grating 11 on the third surface S3, the transmittance is 100%. The transmittance of the coating on the third surface is: T = (1-a) / L*x + a Where x is the distance from a point on the third surface to a point directly below the center point of the coupling grating, T is the transmittance of the coating on the third surface, and L is the total length of the transverse waveguide.

[0038] In one specific embodiment, the initial transmittance α ranges from 1% to 10%.

[0039] like Figures 3-5 As shown, the grating period d11 of the coupled grating, the grating period d12 of the transition grating, and the grating period d13 of the coupled grating have a vector sum of 0 in the K-space structure, which is a closed loop.

[0040] In one embodiment, the grating period d11 of the coupled grating, the grating period d12 of the folding grating, and the grating period d13 of the coupled grating form a triangular grating.

[0041] like Figure 3 As shown, the grating period d11 of the coupled grating, the grating period d12 of the bend grating, and the grating period d13 of the coupled grating are the same; and the angle between the grating direction of the coupled grating and the horizontal direction is downward θ1=30°, the angle between the grating direction of the bend grating and the horizontal direction is downward θ2=30°, and the grating direction of the coupled grating is vertically upward.

[0042] In one specific embodiment, the grating period d11 of the coupled grating, the grating period d12 of the transition grating, and the grating period d13 of the coupled grating are the same, ranging from 300nm to 500nm.

[0043] Where BND1 and BND2 represent the first boundary for satisfying the total internal reflection (TIR) ​​standard in the display panel, and BND2 represents the second boundary for the maximum wave vector in the display panel. The maximum wave vector can be determined by the refractive index of the display panel and the incident angle. The grating period d11 of the coupled grating 11 and the refractive index n of the waveguide are adjusted to satisfy the total internal reflection condition in the transverse waveguide 1, where θ is the incident angle of the beam, θ' is the diffraction angle in the transverse waveguide 1, λ is the wavelength of the incident light, and d is the grating period. According to the grating diffraction formula and the total internal reflection condition: After transforming the above formula, we take the diffraction order as ±1 order to obtain the grating period. By substituting different incident angles and refractive indices, we can obtain a suitable grating period.

[0044] like Figure 4 As shown, is Figure 3 An equivalent grating of the embodiment shown can be equivalent to θ1 upward 30°, the grating direction of the adaptive adjustment grating is θ2 upward 30° with the horizontal, and the grating direction of the coupling grating is vertically downward.

[0045] like Figure 5 As shown, the grating period d11 of the coupled grating, the grating period d12 of the bend grating, and the grating period d13 of the coupled grating form a triangular grating; the grating direction of the coupled grating is at an angle of 10°-50° downward or upward with the horizontal direction, the grating direction of the bend grating is at an angle of 10°-50° downward or upward with the horizontal direction, and the grating direction of the coupled grating can be adaptively adjusted by adjusting the angle θ3 between the coupled grating and the horizontal direction.

[0046] In one embodiment of the present invention, the lateral waveguide 1 is a multilayer lateral waveguide, including two or three layers of lateral waveguides. Using a multilayer lateral waveguide allows for more uniform light emission from the coupling grating. Furthermore, the size of the coupling grating can be larger, resulting in greater light intensity incident from the coupling grating.

[0047] like Figure 6 As shown, the transverse waveguide includes two waveguide layers: a first transverse waveguide 31 and a second transverse waveguide 32. The coupling grating 11 is evenly disposed in the first transverse waveguide and the second transverse waveguide. It can be understood that the structure of the first transverse waveguide 31 and the second transverse waveguide 32 is similar to the structure of the transverse waveguide 1.

[0048] The contact surface between the first transverse waveguide 31 and the second transverse waveguide 32 is the bottom surface of the first transverse waveguide 31. A first part s31a of the bottom surface of the first transverse waveguide 31 is the part away from the coupling grating 11, and a second part s31b is the remaining part; the first part s31a is coated with a gradient transmission film; the second part s31b is coated with a total reflection film; The contact surface between the second transverse waveguide 32 and the turning grating 12 is the bottom surface of the second transverse waveguide 32. A third part s32a of the bottom surface of the second transverse waveguide 32 is the part away from the coupling grating, and a fourth part s32b is the remaining part; the third part s32a is coated with a total transmission film; the fourth part s32b is coated with a gradient transmission film; Light enters the first transverse waveguide 31 and the second transverse waveguide 32 from the coupling grating 11 for transverse transmission; Light is totally reflected within the first transverse waveguide 31 through the second part s31b of the bottom surface of the first transverse waveguide 31 for transverse transmission within the first transverse waveguide, and is gradient-transmitted through the first part s31a to the second transverse waveguide 32; Light is split into two paths within the second transverse waveguide 32 through the fourth part s32b of the second transverse waveguide 32. One part is transmitted into the turning grating 12, and one part is reflected for transverse transmission within the second transverse waveguide 32; and is totally transmitted through the third part s32a into the turning grating.

[0049] In a specific embodiment, the width ratio of the first transverse waveguide 31 and the second transverse waveguide 32 is 4:6 to 6:4; The ratio range of the first part s31a and the second part s31b of the first transverse waveguide 31 is 4:6 to 6:4; The ratio range of the third part s32a and the fourth part s32b of the second transverse waveguide is 4:6 to 6:4.

[0050] [[ID=​​​​​​​​​Where x is the distance from a point on the third surface to a point directly below the center point of the coupling grating, and T is the transmittance of the coating.

[0051] In one specific embodiment, the initial transmittance α ranges from 1% to 10%.

[0052] like Figure 8 As shown, the lateral waveguide includes three waveguide layers: a third lateral waveguide 33, a fourth lateral waveguide 34, and a fifth lateral waveguide 35; the coupling grating is evenly disposed in the third lateral waveguide 33, the fourth lateral waveguide 34, and the fifth lateral waveguide 35. The contact surface between the third transverse waveguide 33 and the fourth transverse waveguide 34 is the bottom surface of the third transverse waveguide 33. The fifth part 33a of the bottom surface of the third transverse waveguide is the part away from the coupling grating, and the sixth part 33b is the remaining part. The fifth part 33a is coated with a gradient transmission film, and the sixth part 33b is coated with a total reflection film. The contact surface between the fourth transverse waveguide 34 and the fifth transverse waveguide 35 is the bottom surface of the fourth transverse waveguide 34. The seventh part 34a of the bottom surface of the fourth transverse waveguide 34 is the part away from the coupling grating, the part close to the coupling grating is the ninth part 34c, and the eighth part is the remaining part 34b. The seventh part 34a is coated with a full transmission film, the eighth part 34b is coated with a gradient transmission film, and the ninth part 34c is coated with a total reflection film. The contact surface between the fifth transverse waveguide 35 and the deflection grating 12 is the bottom surface of the fifth transverse waveguide 35. The tenth part 35a of the bottom surface of the fifth transverse waveguide 35 is the part away from the coupling grating, and the eleventh part 35b is the remaining part. The tenth part 35a is coated with a full transmission film. The eleventh part 35b is coated with a gradient transmission film. Light enters the third transverse waveguide 33, the fourth transverse waveguide 34 and the fifth transverse waveguide 35 from the coupling grating 11 for transverse transmission; The light undergoes total internal reflection in the sixth part 33b of the third transverse waveguide 33 and is transversely transmitted within the third transverse waveguide, and then undergoes gradient transmission through the fifth part 33a to the fourth transverse waveguide 34. Light undergoes total internal reflection in the ninth portion 34c of the fourth transverse waveguide 34, is transversely transmitted within the fourth transverse waveguide, undergoes gradient transmission through the eighth portion 34b, and is fully transmitted to the fifth transverse waveguide 35 through the seventh portion 34a. Light is divided into two paths within the eleventh part 35b of the fifth transverse waveguide 35 in the fifth transverse waveguide 35. One part is transmitted into the turning grating 11, and the other part is reflected and undergoes transverse transmission within the fifth transverse waveguide 35; and it is completely transmitted through the tenth part 35a into the turning grating.

[0053] In a specific embodiment, the length of the transverse waveguide is L, and for S33a, S34b, and S35b, its width ranges from L / 3*(0.8 to 1.2) within the overall length range of the transverse waveguide.

[0054] As Figure 9 shown, the fifth part S33a, the eighth part S34b, and the eleventh part S35b are of gradient transmission, coated with a gradient transmission film, and their lengths are L33a, L34b, and L35b; similar to the third surface S3 of the transverse waveguide 1 in the previous embodiment; the transmittance of the coating located below the coupling grating 11 is the initial transmittance a. For the length L33a of S33a, at the position x (0 < x < L33a), the curve of the transmittance T is: T = (1 - a) / L33a * x + a For the length L34b of S34b, at the position x (0 < x < L34b), the curve of the transmittance T is: T = (1 - a) / L34b * x + a For the length L35b of S35b, at the position x (0 < x < L35b), the curve of the transmittance T is: T = (1 - a) / L35b * x + a where x is the distance from the point on the third surface to the point directly below the center point of the coupling grating, and T is the transmittance of the coating.

[0055] As Figure 10 and Figure 11 shown, in an embodiment of the present invention, a transverse prism is added as a transverse waveguide. After light enters the transverse prism 2 from the coupling grating 11, it will propagate in the transverse prism 2. At the same time, because a part of the transverse prism 2 and 1 are connected, the light beam will exit from the connected part and enter the turning part 12 and the output grating 13.

[0056] In a specific embodiment, the transverse waveguide and the turning grating are adhesively connected or integrally formed.

[0057] The present invention also provides a display device, including the display panel described in any one of the above. The display device of the present invention can be a display screen similar to a PAD.

[0058] The above description provides a further detailed explanation of the present invention in conjunction with specific / preferred embodiments, and it should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various substitutions or modifications can be made to these described embodiments without departing from the concept of the present invention, and all such substitutions or modifications should be considered within the scope of protection of the present invention. In the description of this specification, the reference to terms such as "an embodiment," "some embodiments," "preferred embodiment," "example," "specific example," or "some examples," etc., indicates that the specific features, structures, materials, or characteristics described in connection with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. Without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification and the features of different embodiments or examples. Although the embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions, and modifications can be made herein without departing from the scope of protection of the patent application.

Claims

1. A display panel, characterized in that, It includes, from top to bottom, a transverse waveguide, a bend grating, and a coupling grating; The transverse waveguide consists of four surfaces, with the first and second surfaces parallel to each other, and the third and fourth surfaces parallel to each other. A coupling grating is provided on the end side of the first surface, and the third surface is connected to the deflection grating. Light enters from the coupling grating and is transversely transmitted within the transverse waveguide, passing through the third surface to the deflection grating, and exits from the coupling grating.

2. The display panel as described in claim 1, characterized in that, The third surface is coated with a film having a gradient transmittance.

3. The display panel as described in claim 2, characterized in that, The transmittance of the coating on the third surface located below the coupling grating is the initial transmittance. At the position L furthest from the coupling grating on the third surface, the transmittance is 100%. The transmittance of the coating on the third surface is: T = (1-a) / L*x + a Where x is the distance from a point on the third surface to a point directly below the center point of the coupling grating, T is the transmittance of the coating on the third surface, and L is the total length of the transverse waveguide.

4. The display panel as described in claim 1, characterized in that, The grating period d11 of the coupled grating, the grating period d12 of the transition grating, and the grating period d13 of the coupled grating have a vector sum of 0 in the K-space structure, forming a closed loop.

5. The display panel as described in claim 1, characterized in that, The grating period d11 of the coupled grating, the grating period d12 of the folding grating, and the grating period d13 of the coupled grating form a triangular grating.

6. The display panel as described in claim 4, characterized in that, The grating period d11 of the coupled grating, the grating period d12 of the folding grating, and the grating period d13 of the coupled grating are the same; and the angle between the grating direction of the coupled grating and the horizontal direction is θ1=30°, the angle between the grating direction of the folding grating and the horizontal direction is θ2=30°, and the grating direction of the coupled grating is the vertical direction.

7. The display panel as described in claim 1, characterized in that, The transverse waveguide includes two waveguide layers: a first transverse waveguide and a second transverse waveguide, and the coupling grating is evenly disposed in the first transverse waveguide and the second transverse waveguide; The contact surface between the first lateral waveguide and the second lateral waveguide is the bottom surface of the first lateral waveguide. The first part of the bottom surface of the first lateral waveguide is the part away from the coupling grating, and the second part is the remaining part. The first part is coated with a gradient transmission film, and the second part is coated with a total reflection film. The contact surface between the second transverse waveguide and the deflection grating is the bottom surface of the second transverse waveguide. The third part of the bottom surface of the second transverse waveguide is the part away from the coupling grating, and the fourth part is the remaining part. The third part is coated with a full transmission film. The fourth part is coated with a gradient transmission film. Light enters the first and second transverse waveguides from the coupled grating for transverse transmission; Light undergoes total internal reflection within the first transverse waveguide via the second portion of the bottom surface of the first transverse waveguide, and is then transposed laterally through the first portion to the second transverse waveguide via gradient transmission. Light is split into two paths within the second transverse waveguide through the fourth part of the second transverse waveguide. One part is transmitted into the transition grating, and the other part is reflected and transmitted laterally within the second transverse waveguide. Light then passes through the third part and is fully transmitted into the transition grating.

8. The display panel as described in claim 7, characterized in that, The width ratio of the first transverse waveguide to the second transverse waveguide is between 4:6 and 6:4; The ratio of the first part and the second part of the first transverse waveguide is in the range of 4:6 to 6:4; The ratio of the third and fourth parts of the second transverse waveguide is in the range of 4:6 to 6:

4.

9. The display panel as described in claim 7, characterized in that, The lateral waveguide comprises three waveguide layers: a third lateral waveguide, a fourth lateral waveguide, and a fifth lateral waveguide; the coupling grating is evenly disposed in the third lateral waveguide, the fourth lateral waveguide, and the fifth lateral waveguide; The contact surface between the third lateral waveguide and the fourth lateral waveguide is the bottom surface of the third lateral waveguide. The fifth part of the bottom surface of the third lateral waveguide is the part away from the coupling grating, and the sixth part is the remaining part. The fifth part is coated with a gradient transmission film, and the sixth part is coated with a total reflection film. The contact surface between the fourth lateral waveguide and the fifth lateral waveguide is the bottom surface of the fourth lateral waveguide. The seventh part of the bottom surface of the fourth lateral waveguide is the part away from the coupling grating, the part close to the coupling grating is the ninth part, and the eighth part is the remaining part. The seventh part is coated with a full transmission film, the eighth part is coated with a gradient transmission film, and the ninth part is coated with a total reflection film. The contact surface between the fifth transverse waveguide and the transition grating is the bottom surface of the fifth transverse waveguide. The tenth part of the bottom surface of the fifth transverse waveguide is the part away from the coupling grating, and the eleventh part is the remaining part. The tenth part is coated with a full transmission film. The eleventh part is coated with a gradient transmission film. Light enters the third, fourth, and fifth lateral waveguides from the coupled grating for lateral transmission; The light undergoes total internal reflection at the sixth part of the third transverse waveguide and is transversely transmitted within the third transverse waveguide, and then undergoes gradient transmission through the fifth part to the fourth transverse waveguide. Light undergoes total internal reflection at the ninth part of the fourth transverse waveguide, propagates laterally within the fourth transverse waveguide, undergoes gradient transmission through the eighth part, and undergoes total transmission through the seventh part to the fifth transverse waveguide. Light is split into two paths within the fifth transverse waveguide through the eleventh part of the fifth transverse waveguide. One part is transmitted into the folding grating, and the other part is reflected and transmitted laterally within the fifth transverse waveguide. Light then passes through the tenth part and is fully transmitted into the folding grating.

10. The display panel as claimed in claim 1, characterized in that, The transverse waveguide and the folding grating are either separately configured or integrally formed.

11. A display device, characterized in that, Includes the display panel as described in any one of claims 1-10.

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