CN107515467B

CN107515467B - Display device

Info

Publication number: CN107515467B
Application number: CN201710901464.3A
Authority: CN
Inventors: 马扬昭; 沈柏平
Original assignee: Xiamen Tianma Microelectronics Co Ltd
Current assignee: Xiamen Tianma Microelectronics Co Ltd
Priority date: 2017-09-28
Filing date: 2017-09-28
Publication date: 2021-01-15
Anticipated expiration: 2037-09-28
Also published as: CN107515467A

Abstract

The invention discloses a display device, comprising: a display panel; the backlight module is arranged opposite to the display panel, a first plane where the display panel is located is intersected with a second plane where the backlight module is located, and an included angle between the first plane and the second plane is theta 0; and the light path conversion medium layer is arranged between the display panel and the backlight module and is provided with a first surface and a second surface which are oppositely arranged, wherein light rays which are generated by the backlight module and are vertical to the second plane enter the light path conversion medium layer through the first surface and then enter the display panel after being emitted from the second surface, and the included angle between the light rays entering the display panel and the vertical line of the first plane is more than or equal to 0 and less than theta 0. By reducing the incident angle of light entering the display panel, the contrast of the display panel is improved, and the display effect is improved.

Description

Display device

Technical Field

The present invention relates to the field of display, and more particularly, to a display device.

Background

Head Up Displays (HUDs) are currently a popular flight aid used in aircraft. The HUD projects important relevant information on a piece of glass by using the principle of optical reflection. The piece of glass is located at the front of the cockpit and the text and images are projected onto the coated lens and reflected into the pilot's eye. When the pilot looks ahead through the HUD, the external scene and the data displayed by the HUD can be easily fused together. Since the image reflected into the eye is always balanced with the central axis of the aircraft, the height of the pilot will not cause deviation in pitch angle or visual aiming. The HUD design is used for enabling a pilot to always keep the head-up posture without lowering the head to check the display and data of an instrument, and reducing delay and discomfort caused by neglecting the rapid change of the external environment between lowering the head and raising the head and continuously adjusting the focal length of eyes.

Along with the improvement of technology, HUD has also used the auttombilism field gradually, and HUD produces light through its light source that is shaded, forms the picture through its display panel, and the picture passes through level crossing and curved mirror reflection projection to the medium on, can make the car front gear form the driver and look at the visual picture of head. Because the picture is clearly visible in an outdoor environment and after two reflections, a display panel of the HUD is required to have high contrast and brightness.

Therefore, it is an urgent problem in the art to provide a display device to improve the contrast of the display panel of the HUD.

Disclosure of Invention

In view of this, the present invention provides a display device, which solves the technical problem of low contrast of the display panel of the HUD.

In order to solve the above technical problem, the present invention provides a display device, including:

a display panel;

the backlight module is arranged opposite to the display panel, wherein a first plane where the display panel is located is intersected with a second plane where the backlight module is located, and an included angle between the first plane and the second plane is theta 0;

the light path conversion medium layer is arranged between the display panel and the backlight module and is provided with a first surface and a second surface which are oppositely arranged, wherein the light beam generated by the backlight module is perpendicular to the second plane and enters the light path conversion medium layer through the first surface and then enters the display panel after being emitted from the second surface, and the included angle between the light beam entering the display panel and the perpendicular line of the first plane is more than or equal to 0 and less than theta 0.

Compared with the prior art, the display device disclosed by the invention has the following beneficial effects that:

the display device provided by the invention comprises the backlight module, the display panel and the light path conversion medium layer, wherein the light path conversion medium layer is positioned between the backlight module and the display panel and is used for deflecting light rays emitted by the backlight module and reducing the incident angle of the light rays entering the display panel, so that the contrast of the display device is improved, the display effect is improved, the product percent of pass is increased, and better user experience is achieved,

other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

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

FIG. 1 is a schematic diagram of a flat panel display according to the prior art;

FIG. 2 is a schematic view of a display device according to the present invention;

FIG. 3 is a diagram of the optical path of FIG. 2 with the optical path conversion medium layer removed;

FIG. 4 is a light path diagram of another display device according to the present invention;

FIG. 5 is a schematic view of another display device according to the present invention;

FIG. 6 is a schematic view of another display device according to the present invention;

FIG. 7 is a schematic view of another display device according to the present invention;

FIG. 8 is a schematic view of another display device according to the present invention;

FIG. 9 is a schematic view of another display device according to the present invention;

FIG. 10 is a schematic view of another display device according to the present invention;

FIG. 11 is a schematic view of another display device according to the present invention;

FIG. 12 is a schematic view of another display device according to the present invention;

FIG. 13 is a schematic view of another display device according to the present invention;

FIG. 14 is a schematic view of another display device according to the present invention;

fig. 15 is a schematic structural view of another display device according to the present invention.

Detailed Description

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

Fig. 1 is a schematic structural diagram of a flat panel display in the prior art, as shown in fig. 1, the main components of the flat panel display in the prior art include a backlight module 11 and a display panel 12, an included angle θ 0 is formed between the backlight module 11 and the display panel 12, the backlight module 11 emits a light L4 to the display panel 12, the display panel 12 displays a predetermined image, L1 in fig. 1 is a perpendicular line of the backlight module 11, L1 is perpendicular to a plane where the backlight module 11 is located, and the light L4 is parallel to L1, when a user views an image on the display panel 12, a direction of a line of sight is not always along a direction of L1, and when the user views the image on the display panel 12, the display panel 12 is viewed from a direction of a certain included angle with L1, therefore, the display flat panel display is required to have a certain viewing angle, the viewing angle is usually required to be not less than 25 °, L2 and L3 in fig. 1 are indicated as boundaries of viewing angles, that a size of an angle a and, meanwhile, in the angle range, certain contrast must be ensured, the minimum value of the contrast is usually not less than 350, and the typical value of the contrast is not less than 500, however, the conventional flat panel display is often difficult to meet the requirement, for some conventional flat panel displays, the minimum value of the contrast is about 310, and the typical value of the contrast is about 356, which is not enough to meet the requirement of users, and in actual production, due to the fluctuation of the production process, the quality of the flat panel display is easy to fluctuate, and the yield is reduced.

The inventor has found that when the light emitted from the backlight module 11 vertically enters the display panel 12, the contrast of the flat panel display is greatly improved, the minimum value of the contrast can reach 376, and the typical value of the contrast can reach 398, which is enough to meet the user's requirement. Therefore, the inventor adds the light path conversion medium layer in the backlight module and the display panel, so that the light emitted by the backlight module vertically enters the display panel as far as possible after being converted by the light path conversion medium layer, thereby greatly improving the contrast of the flat panel display, improving the display effect, having better user experience, and the light path conversion medium layer has simple preparation process and low price, and after the light path conversion medium layer is added, the qualification rate of the contrast of the flat panel display is greatly improved. .

The present invention provides a display device, optionally a head-up display. Fig. 2 is a schematic structural diagram of a display device according to the present invention, and as shown in fig. 2, the display device according to the present invention includes: a display panel 22, a backlight module 21 and a light path conversion medium layer 23.

The display panel 22 is used for displaying a predetermined pattern, and the displayed pattern has a certain brightness and contrast, and the display panel 22 may be any transmissive panel or a transflective panel.

The backlight module 21 is disposed opposite to the display panel 22, and is configured to provide light for the display panel 22, and the light emitting diode may be used as a light source of the backlight module 21, or may be another type of light source.

The light path conversion medium layer 23 is disposed between the display panel 22 and the backlight module 21, and has a first surface 231 and a second surface 232 which are disposed opposite to each other, the light path conversion medium layer 23 may be a fully transparent material, a semi-transparent material, a uniform medium material, or a non-uniform medium material, and the light path conversion medium layer 23 may have any shape.

With reference to fig. 2, the first plane where the display panel 22 is located intersects the second plane where the backlight module 21 is located, and an included angle between the first plane and the second plane is θ 0, wherein a light L4 generated by the backlight module 21 and perpendicular to the second plane enters the light path conversion medium layer 23 through the second surface 232, and then is emitted through the first surface 231 to form a light L5, a direction of the light L5 is different from a direction of the light L4, and then the light L5 enters the display panel 22, and an included angle c between the light L5 entering the display panel and a perpendicular d1 of the first plane is greater than or equal to 0 and less than θ 0.

Fig. 3 is a light path diagram of the display device in fig. 2 with the light path conversion medium layer 23 removed, as shown in fig. 3, when the light path conversion medium layer 23 is removed from the display device in fig. 2, a light L4 perpendicular to the backlight module 21 generated by the backlight module 21 directly emits to the display panel 22, as known from the geometrical relationship, an angle d between a perpendicular line d1 perpendicular to the display panel 22 and the light L4 is equal to an angle θ 0 between the backlight module 21 and the display panel 22, and it is found by the inventor that the incident angle d when the light L4 enters the display panel 22, i.e. the angle d, has a direct influence on the display effect of the display device, and under the condition that the maximum viewing angle of the display device is 25 degrees, the larger the angle of the incident angle d when the light L4 enters the display panel 22 in fig. 3 is, the contrast of the display device is worse, and by reducing the incident angle d when the light L4 enters the display panel 22 in fig., the contrast of the display device can be improved.

Therefore, in the display device provided by the present invention, as shown in fig. 2, the light path conversion medium layer 23 is added between the backlight module 21 and the display panel 22, the light L4 emitted from the backlight module 21 changes the direction in the light path conversion medium layer 23 to become the light L5, which is used as the incident light of the display panel 22, the incident angle c of the incident light L5 is smaller than the included angle d between the L4 and the perpendicular line d1 in fig. 3, that is, smaller than the included angle θ 0 between the backlight module 21 and the display panel 22, so that by adding the light path conversion medium layer 23, the incident angle of the incident light of the display panel 22 is reduced, thereby improving the contrast of the display device, improving the display effect, having better user experience, and meanwhile, in some display devices whose original contrast cannot meet the user requirements, the light path conversion medium 23 is added, so that the contrast can meet the user requirements, therefore, the yield in the product preparation process is improved, and the optical performance requirements on the backlight module and the display panel can be properly reduced.

Further, in some alternative embodiments, fig. 4 is a light path diagram of another display device according to the present invention, and as shown in fig. 4, an angle between a light ray L5 entering the display panel 22 and a perpendicular d1 of the first plane is equal to 0. At this time, the light L4 emitted from the backlight module 21 is deflected by the light path conversion medium layer 23 to form a light L5, and the light L5 is used as the incident light of the display panel 22 and is perpendicular to the display panel 22, i.e. parallel to the perpendicular line d 1.

Further, in some alternative embodiments, with continued reference to fig. 4, a third plane in which the first surface 231 is located intersects a fourth plane in which the second surface 232 is located, i.e., the first surface 231 is not parallel to the second surface 232. Emergent light L4 of the backlight module 21 enters the light path conversion medium layer 23 through the first surface 231, and light L4 can be linearly transmitted or transmitted in a broken line or a curve in the light path conversion medium layer 23, that is, the light path conversion medium 23 can be a uniform medium or a medium with a density gradient or concentration gradient inside, and is deflected and then emitted from the second surface 232 to enter the display panel 22. The included angle between the third plane and the fourth plane may be any value, and may be greater than θ 0, or smaller than or equal to θ 0, and the volume of the light path conversion medium layer 23 is not limited, and the space between the backlight module 21 and the display panel 22 is completely filled with the light path conversion medium layer 23, or may be partially filled.

Further, in some optional embodiments, fig. 5 is a schematic structural diagram of another display device in the present invention, as shown in fig. 5, a fourth plane where the second surface 232 is located overlaps the first plane, that is, the second surface of the optical path conversion medium layer 23 overlaps a surface of the display panel 22 close to the backlight module 21, a light L4 emitted from the backlight module 21 enters the optical path conversion medium layer through the first surface 321, when the optical path conversion medium layer 23 is a uniform medium, the light L4 is deflected to become a light L6, the light L6 is linearly propagated in the optical path conversion medium layer 23 and then enters the display panel 22, at this time, the direction of the light L6 can be adjusted by adjusting the slope of the first surface 231, that is, the included angle between the first surface 231 and the light L4, so that the light L6 is perpendicular to the display panel 22, the display effect is improved, and by adjusting the slope of the first surface 231, the direction of the light ray L6 can be controlled relatively simply, the cost is low, and the implementation is easy.

In other alternative embodiments, fig. 6 is a schematic structural view of another display device in the present invention, and as shown in fig. 6, the fourth plane is parallel to the first plane, that is, the second surface 232 of the light path conversion medium layer 23 is spaced from and parallel to one surface of the display panel 22 close to the backlight module 21. After the light L4 passes through the light path conversion medium layer 23, the incident light L5 of the display panel 22 is transmitted to enter the display panel 22, and the light path display medium layer 23 is separated from the backlight module 21 and the display panel 22 by a certain distance, so that the heat dissipation space can be increased, the phenomenon that the temperature of the display device is too high for a long time is avoided, and the service life is shortened.

Further, in some alternative embodiments, fig. 7 is a schematic structural diagram of another display device in the present invention, as shown in fig. 7, an included angle between the third plane and the fourth plane is θ 3, and the refractive index of the light path conversion medium layer 23 is n1, then θ 0, θ 3, and n1 satisfy the following relationships: sin (θ 0+ θ 3)/sin θ 3 ═ n 1. Specifically, as shown in fig. 7, a perpendicular line d2 is perpendicular to the first surface 231, L4 is perpendicular to the backlight module 21, L6 is perpendicular to the display panel 22, light emitted from the backlight module 21 reaches the first surface 231 along L4, and is refracted on the first surface 231, the light enters the light path conversion medium layer 23 along L6, L6 is perpendicular to the display panel 22, and L41 is an extension line of L4, as seen from a geometrical relationship, an included angle between L41 and L6 is equal to an included angle θ 0 between the backlight module 21 and the display panel 22, an included angle between L6 and d2 is equal to an included angle θ 3 between the first surface 231 and the second surface 232, an included angle θ 2 between L4 and d2 is equal to θ 0 plus θ 3, refraction occurs on the first surface 231, a refraction law must be satisfied, and when the space between the light path conversion medium layer 23 and the backlight module 21 is in an air or vacuum state, a refractive index of the space can be regarded as 1, since sin (θ 2)/sin θ 3 ═ n1/1, that is, sin (θ 0+ θ 3)/sin θ 3 ═ n1, is known from the law of refraction, after the material of the optical path conversion medium is selected, the value of the angle θ 3 can be determined from the refractive index of the material and the value of the angle of the included angle θ 0, thereby relating to the shape of the optical path conversion medium layer.

Further, in some alternative embodiments, the material of the optical path conversion medium layer 23 is glass, θ 0 is 15 ° to 30 °, θ 3 is 25.8 ° to 38.3 °, specifically, referring to fig. 7, the refractive index of common glass is about 1.5, that is, n1 is equal to 1.5, and according to the equation sin (θ 0+ θ 3)/sin θ 3 is n1, after determining that one of θ 0 and θ 3 is determined, another number can be determined, the included angle θ 0 between the backlight module 21 and the display panel 22 is typically 15 ° to 30, therefore, when selecting glass as the material of the optical path conversion medium layer 23, θ 3 is 25.8 ° to 38.3 °, when the incident light L6 is incident to the display panel 22 in a direction approximately perpendicular to the display panel 22, so as to improve the contrast of the display device, and when the material of the substrate for manufacturing the display panel 22 is glass, that is the same as the material of the optical path conversion medium layer 23, the second surface 232 of the light path conversion medium layer 23 is attached to a surface of the display panel 22 close to the backlight module 21, so that light L4 emitted from the backlight module 21 is deflected at the first surface 231 and enters the light path conversion medium layer 23 to become light L6, and the light L6 propagates along a straight line direction and is not refracted on a contact surface between the light path conversion medium layer 23 and the display panel 22, so that the propagation direction of the light L6 in the display panel 22 is also approximately perpendicular to the display panel 22, thereby improving the utilization rate of the light and improving the contrast and brightness.

Further, in some alternative embodiments, the material of the optical path conversion medium layer 23 is an organic material, and θ 0 is 15 ° to 30 °, and θ 3 is 20.5 ° to 40.5 °. Specifically, referring to fig. 7, after determining one of θ 0 and θ 3, the refractive index of a transparent organic material, such as polycarbonate or organic glass, is between 1.45 and 1.65, and according to the equation sin (θ 0+ θ 3)/sin θ 3 ═ n1, the other number can be determined, and the included angle θ 0 between the backlight module 21 and the display panel 22 is usually 15 ° to 30, therefore, when selecting the organic material as the material of the light path conversion medium layer 23, it is necessary to set θ 3 to 20.5 ° to 40.5 °, that is, after determining the material of the light path conversion medium layer 23, the included angle θ 3 between the first surface 231 and the second surface 232 in fig. 7 can be determined according to the included angle between the backlight module 21 and the display panel 22, and by adjusting the value of θ 3, the light L6 entering the display panel 22 is ensured to be approximately perpendicular to the display panel 22, thereby improving the contrast and display effect of the display device.

Further, in some optional embodiments, referring to fig. 7, the optical path conversion medium layer 23 includes a monolithic prism, the monolithic prism has a first surface 231 and a second surface 232, specifically, the optical path conversion medium layer 23 may be a monolithic prism, and at this time, the prism of the optical path conversion medium layer 23 may be prepared in an integrated injection molding manner, and the preparation process is simple, and when adjusting the prism, the position and the posture of the prism may be adjusted, and an included angle between the first surface 231 and the second surface 232 may also be adjusted, so that the adjustment and the processing are easy.

Further, in some alternative embodiments, the prism as shown in fig. 7 is a triple prism, when the prism as the light path conversion medium layer 23 is a triple prism, the included angle between the first surface 231 and the second surface 232 is an included angle of the triple prism, when the triple prism is used, one surface of the triple prism may be attached to the display panel as shown in fig. 7, fig. 8 is a schematic structural view of another display device according to the present invention as shown in fig. 8, in some alternative embodiments, the triple prism may be disposed between the backlight module 21 and the display panel 22 without contacting with each other, so as to increase a heat dissipation space and prevent overheating, at this time, in order to fix the relative positions between the light path conversion medium layer 23, the backlight module 21 and the display panel 23, a fixing bracket 24 as shown in fig. 8 may be added on one side of the display device, and the fixing bracket 24 may be respectively connected to the backlight module 21, and the display panel, The light path conversion medium layer 23 and the display panel 22 are connected to fix these components.

Fig. 8 is an example, which shows an alternative embodiment, and does not limit the fixing manner between the respective components of the display device of the present invention. In other embodiments, when the second surface 232 of the optical path conversion medium layer 23 is parallel to and attached to the display panel 22, a transparent optical adhesive, i.e., OCA adhesive, may be used to fix the optical path conversion medium layer 23 on the surface of the display panel 22. At this time, only the fixing device is needed to fix the display panel 22, and the fixing device is not needed to fix the light path conversion medium layer 23, so that the occupied space of the display device is saved.

Fig. 9 is a schematic structural view of another display device in the present invention, and as shown in fig. 9, in some alternative embodiments, the first surface 231 may be attached to the backlight module 21. Fig. 10 is a schematic structural view of another display device according to the present invention, and as shown in fig. 10, in some alternative embodiments, the prism 23 may be a trapezoidal prism. No matter a prism or a trapezoidal prism is adopted, the light path conversion medium layer 23 will have a third surface 233, and referring to fig. 10, an included angle θ 5 is formed between the second surface 232 and the third surface 233, and an included angle θ 4 is formed between the third surface 233 and the first surface 231, when all the light rays emitted from the backlight module 21 can be just received by the first surface 231, the third surface 231 is perpendicular to the backlight module 21, and at this time, as can be seen from the geometric relationship, θ 5 is θ 0+90 °. Therefore, if the first surface 231 is ensured to receive all the light emitted from the backlight module 21, θ 5 should be not less than θ 0+90 °, and θ 3+ θ 4+ θ 5 is 180 ° as seen from the geometric relationship, and therefore, θ 4 should not be greater than 90 ° - θ 0- θ 3 as shown in fig. 10.

Further, in some alternative embodiments, fig. 11 is a schematic structural diagram of another display device in the present invention, fig. 12 is a schematic structural diagram of another display device in the present invention, as shown in fig. 11, the optical path conversion medium layer 23 includes a plurality of micro prism units 234 arranged in sequence, each micro prism unit 234 has a first surface 231 and a second surface 232, the micro prism units 234 may be triangular prisms in fig. 11, or trapezoidal prisms in fig. 12, the shapes of the micro prism units 234 may be the same, or different, and the materials used may be the same, or different, as shown in fig. 11, when the micro prism units 234 are triangular prisms, the micro prism units 234 further have third surfaces 233, which are parallel to the light L4 emitted from the backlight module 21, and the first surfaces 231 of the micro prism units 234 are projected on the backlight module 21, covering the light-emitting area of the backlight module 21, ensuring that the light emitted from the backlight module 21 can be totally emitted into the display template 22, improving the light utilization rate, and increasing the brightness of the display panel, as shown in fig. 12, when the micro-prism unit 234 is a trapezoidal prism, the micro-prism unit 234 further has a fourth surface 235 parallel to the third surface 233, and the third surface 234 and the fourth surface 235 are parallel to the light L4 emitted from the backlight module 21, so as to prevent interference to the light.

Further, in some alternative embodiments, fig. 13 is a schematic structural diagram of another display device in the present invention, as shown in fig. 13, when the optical path conversion medium layer 23 includes a plurality of micro prism units 234 arranged in sequence, each micro prism unit 234 has a first surface 231 and a second surface 232, the micro prism units 234 may be triangular prisms in fig. 11 or trapezoidal prisms in fig. 12, the micro prism units 234 in fig. 13 are only used as an example, in order to fix each micro prism unit 234, in this case, as shown in fig. 11 or fig. 12, the second surface 232 of one or more micro prism units 234 may be fixed on a side of the display panel 22 close to the backlight module 21, the micro prism units 234 are directly or indirectly connected with other micro prism units 234, so as to fix the whole optical path conversion medium layer 23, as also shown in fig. 13, the second surface 232 of one or more micro-prism units 234 is fixed on the surface of the display panel 22 close to the backlight module 21, and the contact point between the first surface 231 and the third surface 233 of another micro-prism unit 234 is fixed on the backlight module 21, and these micro-prism units 234 are directly or indirectly connected with the rest micro-prism units 234, thereby fixing the whole light path conversion medium layer 23.

In some alternative embodiments, a light-transmissive material may be further poured between the backlight module 21 and the display panel 22, the micro-prism units 234 are embedded on the light-transmissive material, and the light-transmissive material is in contact with the backlight module 21 or the display panel 22, in some alternative embodiments, the micro-prism units 234 may be connected into a whole, and at one side or both sides of the display device, the fixing bracket 24 shown in fig. 8 is disposed, and the light path conversion medium layer 23 is fixed on the fixing bracket 24, where the fixing bracket may be one or multiple ones.

Further, in some optional embodiments, fig. 14 is a schematic structural view of another display device in the present invention, and fig. 15 is a schematic structural view of another display device in the present invention, as shown in fig. 14 and fig. 15, the second surfaces 232 of the micro-prism units 234 are on the same plane, and the first surfaces 231 of the micro-prism units 234 are parallel to each other, as shown in fig. 14, when the micro-prism units 234 are triangular prisms, the micro-prism units 234 are similar to each other in a triangular shape and made of the same material, and the third surfaces 234 of the micro-prism units 234 are parallel to the light emitted from the backlight module 21, i.e., the third surfaces 234 are perpendicular to the backlight module 21, as shown in fig. 15, when the micro-prism units 234 are trapezoidal prisms, the third surfaces 233 and the fourth surfaces 235 of the micro-prism units 234 are parallel to the light emitted from the backlight module 21. In some alternative embodiments, the micro prism unit 234 may include both a triangular prism and a trapezoidal prism, and in some alternative embodiments, the micro prism unit 234 may be a thin film of the triangular prism micro prism unit 234 or a thin film of the trapezoidal prism, or a mixture of the triangular prism thin film and the thin film of the trapezoidal prism, and the thickness of the optical path conversion medium layer 23 and the absorption of light may be reduced by preparing the micro prism unit 234 as a thin film, thereby increasing the brightness of the display device.

According to the embodiment, the display device of the invention has the following beneficial effects: the display device provided by the invention comprises the backlight module, the display panel and the light path conversion medium layer, wherein the light path conversion medium layer is positioned between the backlight module and the display panel and is used for deflecting light rays emitted by the backlight module and reducing the incident angle of the light rays entering the display panel, so that the contrast of the display device is improved, the display effect is improved, better user experience is achieved, the contrast of the display device is greatly improved by arranging the light path conversion medium layer, and the product percent of pass is improved.

Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A display device, wherein the display device is a head-up display, comprising:

a display panel;

the backlight module is arranged opposite to the display panel, wherein a first plane where the display panel is located is intersected with a second plane where the backlight module is located, and an included angle between the first plane and the second plane is theta 0; the backlight module comprises a fifth surface and a sixth surface which are arranged oppositely, the plane of the fifth surface is parallel to the plane of the sixth surface, the fifth surface is a light-emitting surface of the backlight module, and the sixth surface is a surface of the backlight module on the side far away from the fifth surface; the display panel comprises a seventh surface and an eighth surface which are arranged oppositely, the plane where the seventh surface is located and the plane where the eighth surface is located are parallel to each other, the seventh surface is the surface of the display panel close to one side of the backlight module, and the eighth surface is the light-emitting surface of the display panel;

the light path conversion medium layer is arranged between the display panel and the backlight module and is provided with a first surface and a second surface which are oppositely arranged, wherein light rays generated by the backlight module and perpendicular to the second plane enter the light path conversion medium layer through the first surface and then enter the display panel after being emitted through the second surface, and an included angle between the light rays entering the display panel and a perpendicular line of the first plane is more than or equal to 0 and less than theta 0;

a third plane where the first surface is located is intersected with a fourth plane where the second surface is located, and the fourth plane and one surface, close to the backlight module, of the display panel are parallel to each other and have equal distances;

an included angle between the third plane and the fourth plane is theta 3; the light path conversion medium layer comprises a third surface intersected with the first surface and the second surface, an included angle theta 5 is formed between the second surface and the third surface, an included angle theta 4 is formed between the third surface and the first surface, theta 5 is larger than or equal to theta 0+90 degrees, and theta 4 is smaller than or equal to 90 degrees and smaller than or equal to theta 0-theta 3 degrees.

2. The display device according to claim 1, wherein an angle between a light ray entering the display panel and a perpendicular to the first plane is equal to 0.

3. The display device according to claim 1, wherein the refractive index of the light path conversion medium layer is n1, and θ 0, θ 3, and n1 satisfy the following relationships:

sin(θ0+θ3)/sinθ3＝n1。

4. the display device according to claim 1, wherein the material of the optical path conversion medium layer is glass, and θ 0-15 ° to 30 ° and θ 3-25.8 ° to 38.3 °.

5. The display device according to claim 1, wherein the material of the optical path conversion medium layer is an organic material, and θ 0 ═ 15 ° to 30 ° and θ 3 ═ 20.5 ° to 40.5 °.

6. The display device of claim 1, wherein the optical path conversion medium layer comprises a one-piece prism having the first surface and the second surface.

7. The display device of claim 6, wherein the one-piece prism is a triangular prism or a trapezoidal prism.

8. The display device according to claim 1, wherein the light path conversion medium layer comprises a plurality of micro-prism units arranged in sequence, each of the micro-prism units having the first surface and the second surface.

9. The display device according to claim 8, wherein the second surface of each of the microprism units is in a same plane and the first surfaces of each of the microprism units are parallel to each other.

10. The display device according to claim 9, wherein the micro prism unit is a triple prism film or a trapezoidal prism film.