Display device for motor vehicle and related motor vehicle

Abstract

The invention relates to a display device (1) for a motor vehicle, comprising a display surface (2) and a light-emitting element (3), which has a surface (4) corresponding to the display surface (1), which surface is oriented towards the display surface (2) and is designed to emit light that can be provided by the light-emitting element; a first diffusion element (6), which is arranged between the surface (4) of the light-emitting element (3) and the display surface (2) and is designed to homogenize the light of the light-emitting element (3); and a second diffusion element (7) also arranged between the surface (4) of the light-emitting element (3) and the display surface (2), which second diffusion element functions as a diffuser for light incident at a low angle from the light-emitting element (3) and is transparent for light incident thereon at a high angle from the light-emitting element (3). The invention further relates to a motor vehicle.

Description

Technical Field

[0001] This invention relates to a display device for a motor vehicle according to claim 1. Furthermore, this invention also relates to a motor vehicle according to claim 10. Background Technology

[0002] In motor vehicles, such as passenger cars, vans, or trucks, there is usually a display device, especially in the dashboard, which can display, for example, the speed of the motor vehicle.

[0003] Korean patent KR10-1233890B1 discloses a liquid crystal display with a laminated diffusion plate.

[0004] In order to enable the motor vehicle to operate with exceptional efficiency, it is desirable that the components used in the motor vehicle (such as the aforementioned display device) operate in a particularly efficient manner. Summary of the Invention

[0005] Therefore, the objective of this invention is to provide a display device and a motor vehicle that can achieve particularly efficient operation.

[0006] This task is solved by the subject matter of the independent claims. Advantageous designs and improvements of the invention are described in the dependent claims, the specification, and the drawings.

[0007] A first aspect of the present invention relates to a display device for a motor vehicle. The display device for a motor vehicle according to the invention includes a display surface and a light-emitting element having a surface corresponding to the display surface, the surface being oriented toward the display surface and configured to emit light that can be provided by the light-emitting element. Furthermore, the display device includes: a first diffusion element disposed between the surface of the light-emitting element and the display surface, and configured to homogenize the light from the light-emitting element (especially to make the display surface emit light uniformly); and a second diffusion element also disposed between the surface of the light-emitting element and the display surface, which acts as a diffuser for light incident from the light source at a low angle and is substantially transparent for light incident from the light source at a high angle.

[0008] The display surface may, for example, include a liquid crystal display (LCD), and can therefore be configured to be transparent depending on the power supply of the liquid crystal, allowing the light-emitting elements to illuminate the display surface and thus enabling the display device to operate in a manner similar to a conventional TFT monitor. The first diffusion element may, for example, be a milky white glass used to homogenize the light from the light-emitting elements. Thus, the light-emitting elements may consist of, for example, multiple fluorescent tubes or multiple LED elements arranged side-by-side, which should achieve as uniform an illumination of the display surface as possible. For this purpose, the surface of the light-emitting elements is substantially the same size as the display surface. Here, "substantially" means that a few percent difference in size is permissible. Therefore, the display surface, together with the light-emitting elements and the first diffusion element, essentially constitutes the conventional arrangement of a display device.

[0009] The second diffusion element is now used to enable the display device to operate in a particularly efficient manner and is configured such that, for light emitted from the surface of the light-emitting element and incident on the second diffusion element (which in particular also has a surface) at an angle substantially perpendicular to its surface, the second diffusion element does not function as a diffuser, but is at least substantially transparent. Therefore, for light incident on this surface at a substantially perpendicular angle, the achievable transmittance of the second diffusion element is particularly high, and it does not diffuse light incident at that angle, or only produces a very weak diffusion effect. The dimensions of the surface of the second diffusion element can substantially correspond to the dimensions of the display surface or the surface of the light-emitting element.

[0010] As the angle at which light, or beam, incident on the surface of the second diffuser element decreases (becomes increasingly gentle), the diffuser properties of the second diffuser element are enhanced. That is, the beam of light emitted obliquely from the light-emitting element can be deflected at the second diffuser element, similarly to how it is at the first diffuser element, allowing the beam to propagate in almost all directions as spherical waves. The resulting effect is that light that exits obliquely from the light-emitting element or its surface, and thus laterally from the area between the surface of the display device or the light-emitting element and the display surface before reaching the display surface, is reflected back at least partially due to the diffusion that occurs in the second diffuser element. Therefore, this light reflected back due to diffusion is not wasted for illuminating the display surface, or in other words, the overall light intensity loss of the light-emitting element is less. The second diffuser element can be made of plastic, in particular, possessing the desired light refraction-related properties.

[0011] In other words, a display device is provided in which, although the LEDs and / or optical elements that provide light to the surface have broad emission characteristics, the light can still be effectively utilized. A second diffusion element is helpful in this regard; this second diffusion element is transparent at low angles but diffuses at higher angles, and there, better uniformity can be ensured, thereby enabling, for example, particularly uniform illumination of the display surface. The light-emitting elements serve as background illumination for the display surface.

[0012] Backlighting is used in liquid crystal displays (LCDs) and liquid crystal displays (LCDs). It is installed behind the display surface or the LCD to allow information to be displayed by transmitting light. Depending on the control of the image segments on or within the display surface, the light is absorbed to varying degrees there, which creates the impression of a self-illuminating image when viewed.

[0013] Advantageously, the second diffusion element is arranged between the first diffusion element and the light-emitting element. In other words, in the conventional arrangement of the light-emitting element, the first diffusion element, and the display surface, the second diffusion element is installed in the optical path before the first diffusion element, such that a light beam incident at a low angle at the edge of the surface defined by the size of the display surface on its outer periphery can be reflected back to the first diffusion element, thereby achieving particularly advantageous uniformity. The resulting advantage is that the display device can be illuminated particularly uniformly.

[0014] In another advantageous embodiment of the invention, the display surface includes a liquid crystal display. In other words, the display device is configured as a liquid crystal display screen in which the display surface for displaying light can be influenced by the voltage-preset polarization direction of the liquid crystal. The resulting advantage is that the display device can be constructed from well-proven components, thereby, for example, improving reliability.

[0015] In another advantageous embodiment of the invention, the light-emitting element has multiple emitters, particularly light-emitting diodes (LEDs), organic light-emitting diodes (OLEDs), and / or quantum dots, through which light can be provided. In other words, multiple light-emitting elements are provided, for example, arranged in a matrix or in rows and columns, particularly in a planar arrangement, which constitute the surface of the light-emitting element and provide light. Quantum dots are nanoscale material structures, particularly composed of semiconductor elements, which can be advantageously excited to emit light and are therefore advantageously suitable as background illumination. The resulting advantage is that particularly efficient operation can be achieved in a particularly efficient manner, for example, especially compared to side-illuminated display surfaces.

[0016] To achieve particularly advantageous light output efficiency and thus particularly efficient operation in such a light-emitting element, it is advantageous that the second diffuser element has multiple individual segments, each corresponding to one of the plurality of emitters. For example, a separate diffuser element segment can be provided for each emitter, thereby further enabling a particularly advantageous design scheme for the display device.

[0017] To achieve exceptionally high light output efficiency using segmented diffuser elements, each segment is designed to have a void or be completely transparent, particularly at positions corresponding to the respective emitters. For example, the second diffuser element can be conceived as an aperture plate, arranged such that each aperture, or void, is directly above an emitter. Thus, the second diffuser element can be advantageously configured to be particularly transparent to light incident at high angles. The resulting advantage is that the display device can operate with exceptionally high efficiency.

[0018] In another advantageous embodiment of the invention, each emitter is provided with an optical element, particularly a collimator and / or a field lens. In other words, to improve the emission characteristics of each individual emitter and, for example, to advantageously prevent obliquely emitted scattered light from the beginning of the optical path, an optical element is provided, for example, constructed as a collimator or comprising a field lens that also has a collimating function. The resulting advantage is that light can be guided from the light-emitting element to the display surface with particularly high efficiency.

[0019] In an advantageous embodiment of the invention, the display device forms part of a head-up display (HUD) for a motor vehicle. In other words, the display device is used to implement a head-up display for a motor vehicle by acting as an image generator to illuminate the projection surface of the HUD, particularly the windshield. The resulting advantage is that a particularly efficient HUD or head-up display device can be achieved due to its exceptionally high light output efficiency.

[0020] In another advantageous embodiment of the invention, at least one material of the second diffusion element is plastic, particularly stretched plastic. The advantage of using plastic is that the second diffusion element can be constructed at a particularly low cost, and it also possesses the desired optical properties.

[0021] A second aspect of the invention relates to a motor vehicle that includes a display device according to the first aspect of the invention.

[0022] Hereinafter, the advantageous designs, improvements and advantages of the first aspect of the present invention should be regarded as the advantageous designs, improvements and advantages of the second aspect of the present invention, and vice versa.

[0023] Other features of the invention are derived from the claims, drawings, and description of the drawings. The features and combinations thereof mentioned above in the description, as well as those mentioned below in the description of the drawings and / or shown only in the drawings, may be used not only in the respective described combinations, but also in other combinations or alone. Attached Figure Description

[0024] The present invention will now be described in detail with reference to a preferred embodiment and the accompanying drawings. In the drawings:

[0025] Figure 1 A schematic cross-sectional view of a display device for a motor vehicle is shown, the display device having a display surface; and

[0026] Figure 2 This diagram illustrates the distribution of light intensity on the display surface. Detailed Implementation

[0027] Figure 1 A schematic side sectional view shows a display device 1 for a motor vehicle (which may be configured as a passenger car or a freight car). The display device has a display surface 2 and a light-emitting element 3. The light-emitting element 3 has a surface 4 corresponding to the display surface 2, and this surface 4 is oriented towards the display surface 2 and configured to emit light (represented by a beam 5) that can be provided by the light-emitting element 3. A first diffusion element 6 is arranged between the surface 4 of the light-emitting element 3 and the display surface 2. This first diffusion element 6 is configured to homogenize the light from the light-emitting element 3. When the beam 5 is incident on the first diffusion element 6 at an arbitrary angle, diffusion occurs at the corresponding incident point; this diffusion is schematically represented by a further beam 8. Here, in Figure 1 In the beam 8 generated by a single beam 5, the length of each beam 8 corresponds to the intensity of the light (or beam 8) in that direction. Therefore, length corresponds to intensity.

[0028] In order for the display device 1 to be used in a particularly advantageous manner in motor vehicles, it is desirable that it operate, for example, in a particularly efficient manner. To achieve this, a second diffuser element 7 is provided, which is also arranged between the surface 4 of the light-emitting element 3 and the display surface 2. The second diffuser element acts as a diffuser for light (or beam 5) incident from the light source (i.e., the light-emitting element 3) at a low angle (shallow angle), and is transparent to light incident on it from the light source at a high angle (steep angle). The characteristics of the second diffuser element can be clearly seen through the beam 8, which is generated only at the incident positions of the two outer beams 5.

[0029] To achieve particularly efficient operation and to facilitate the diffusion of the laterally emitted beam 5, it is especially advantageous to arrange the second diffusion element 7 between the first diffusion element 6 and the light-emitting element 3.

[0030] The light-emitting element 3 includes or has multiple emitters 9, which may in particular be composed of light-emitting diodes, organic light-emitting diodes, and / or quantum dots, respectively. For clarity, Figure 1 Only one of the emitters 9 for the light-emitting element 3 is shown as an example.

[0031] Display surface 2 is configured, for example, as a liquid crystal display, or in other words, display surface 2 includes a liquid crystal display.

[0032] The second diffusion element 7 can be composed of multiple individual segments, each corresponding to a transmitter. For example, Figure 1 The region or portion of the second diffuser element 7 shown can form a segment corresponding to the corresponding emitter 9. Advantageously, each segment can have, for example, a void (light-transmitting portion) or be completely transparent, which is particularly advantageous in the central region of each segment—for example, in… Figure 1 In this process, the central region can be defined by two beams 5 that are perpendicularly incident on the second diffuser element 7.

[0033] To further achieve efficient operation, it is advantageous to equip each transmitter 9 with an optical element 10, such as an optical element in the form of a collimator and / or a field lens.

[0034] The second diffusion element 7 is made of plastic, which acquires its optical properties, for example, through a stretching process during manufacturing. These optical properties distinguish it from the conventional diffusion element 6 in its angle-dependent diffusion behavior. This is in Figure 1 This is particularly evident through the generation or existence of beam 8.

[0035] Furthermore, this document also aims to propose a motor vehicle that includes the aforementioned display device 1 and can thus be schematically regarded based on its display device 1. Figure 1 As shown in the figure.

[0036] Figure 2 The distribution of light intensity on display surface 2, or rather, along its width diagonally across the paper, is illustrated schematically. Here, solid curves or lines represent... Figure 1 The intensity distribution I of the display device 1 shown on surface F, or rather, the intensity distribution I corresponding to that distribution, corresponds to region B. Region B corresponds to... Figure 1 The width of display surface 2 in the indicated direction.

[0037] The dashed curve or line represents the intensity distribution I of a conventional display device, which is constructed similarly to display device 1 but omits the second diffusion element 7. Figure 2 As can be seen from the schematic diagram, compared with conventional display devices, a particularly high light output efficiency can be achieved precisely at the edge of the display surface 2, or in this region of the display surface 2. This effect can be achieved by cleverly utilizing the characteristics of the second diffusion element 7. The intensity gain achieved by the display device 1 proposed in this invention is highlighted by the shaded area between the two curves.

[0038] The present invention provides a display device 1 and a motor vehicle, which enable the motor vehicle to operate with exceptionally high efficiency.

[0039] List of reference numerals

[0040] 1 Display device

[0041] 2 Display Surface

[0042] 3 light-emitting elements

[0043] 4 sides

[0044] 5 beams

[0045] 6 First diffusion element

[0046] 7 Second diffusion element

[0047] 8. Further beams

[0048] 9 launchers

[0049] 10 optical components

Claims

1. A display device (1) for a motor vehicle, the display device having: a display surface (2) and a light-emitting element (3), the light-emitting element having a surface (4) corresponding to the display surface (2), and the surface being oriented toward the display surface (2) and configured to emit light that can be provided by the light-emitting element; A first diffusion element (6) is disposed between the surface (4) of the light-emitting element (3) and the display surface (2) and is configured to homogenize the light of the light-emitting element (3); And a second diffusion element (7), which is also arranged between the surface (4) of the light-emitting element (3) and the display surface (2), the second diffusion element acts as a diffuser for light incident from the light-emitting element (3) at a low angle, and is transparent for light incident from the light-emitting element (3) at a high angle onto the second diffusion element.

2. The display device according to claim 1, characterized in that, The second diffusion element (7) is arranged between the first diffusion element (6) and the light-emitting element (3).

3. The display device according to claim 1 or 2, characterized in that, The display surface (2) includes a liquid crystal display.

4. The display device according to any one of claims 3, characterized in that, The light-emitting element (3) has multiple emitters (9) through which light can be provided.

5. The display device according to claim 4, characterized in that, The second diffusion element (7) has a separate segment corresponding to each of the plurality of emitters (9).

6. The display device according to claim 5, characterized in that, Each of the aforementioned segments has a blank space or is completely transparent.

7. The display device according to claim 4, 5 or 6, characterized in that, Each of the aforementioned transmitters (9) is equipped with an optical element (10), in particular a collimator and / or a field lens.

8. The display device according to any one of the preceding claims, characterized in that, The display device (1) is configured as a component of the head-up display for the motor vehicle.

9. The display device according to any one of the preceding claims, characterized in that, At least one material of the second diffusion element (7) is plastic, especially stretched plastic.

10. A motor vehicle comprising a display device (1) according to any one of the preceding claims.

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