Picture Generation Device

Abstract

An image forming device is disclosed. According to one embodiment of the present disclosure, an image forming device is provided comprising: a PCB on which one or more light sources are disposed; an LCD that emits an image using light transmitted from one or more light sources; and a housing disposed between the PCB and the LCD, wherein the housing comprises: one or more first funnels disposed corresponding to each of the one or more light sources; a second funnel disposed above the first funnel in a shape that encompasses the one or more first funnels; and one or more vent holes disposed above the second funnel and discharging heat inside the housing to the outside.

Description

Technology Field

[0001] The present disclosure relates to an image forming device. Background Technology

[0002] The content described in this section merely provides background information regarding the present disclosure and does not constitute prior art.

[0003] A Head-Up Display (HUD) is a device that projects various information related to vehicle operation, such as current speed, navigation, and fuel level, onto the windshield for the driver to view. By using a HUD, drivers can easily see this information, allowing them to keep their eyes on the road ahead with minimal visual distraction while driving.

[0004] A head-up display may include a case with an internal housing space, a picture generation unit (PGU) that emits images related to vehicle operation information, a reflection member, a dust cover, etc. Due to its characteristics, the head-up display is installed below the vehicle's windshield.

[0005] An image forming device may include a light source that emits light, a Printed Circuit Board (PCB) on which the light source is placed, a Liquid Crystal Display (LCD) that emits an image, a lens that uniformly concentrates the light transmitted from the light source onto the LCD, and a diffuser that evenly spreads the light onto the LCD.

[0006] When manufacturing various components of an image forming device separately, manufacturing costs are high, and there is a problem in that the image forming device must be manufactured differently depending on the vehicle model.

[0007] Meanwhile, the internal temperature of the image forming device rises due to heat generated from multiple light sources. As key components of the image forming device, such as the LCD, heat up, there is a problem where the temperature reliability of the components is reduced. The problem to be solved

[0008] An image forming device according to one embodiment reduces the manufacturing cost of the image forming device and allows the image forming device to be commonly adopted regardless of the vehicle type by concentrating light transmitted from a light source using a first funnel and a second funnel formed inside a housing.

[0009] An image forming device according to one embodiment can improve the temperature reliability of a key component of the image forming device, such as an LCD, by smoothly discharging heat generated from a light source to the outside using a plurality of vent holes formed in a housing.

[0010] The problems that the present invention aims to solve are not limited to those mentioned above, and other unmentioned problems will be clearly understood by a person skilled in the art from the description below. means of solving the problem

[0011] According to one embodiment of the present disclosure, an image forming device is provided comprising: a PCB on which one or more light sources are disposed; an LCD that emits an image using light transmitted from one or more light sources; and a housing disposed between the PCB and the LCD, wherein the housing comprises: one or more first funnels disposed corresponding to each of the one or more light sources; a second funnel disposed above the first funnel in a shape that encompasses the one or more first funnels; and one or more vent holes disposed above the second funnel and discharging heat inside the housing to the outside. Effects of the invention

[0012] According to one embodiment, the image forming device collects light transmitted from a light source using a first funnel and a second funnel formed inside a housing, thereby reducing the manufacturing cost of the image forming device and enabling the image forming device to be commonly adopted regardless of the vehicle type.

[0013] According to one embodiment, the image forming device can improve the temperature reliability of key components of the image forming device, such as an LCD, by smoothly discharging heat generated from a light source to the outside using a plurality of vent holes formed in the housing. Brief explanation of the drawing

[0014] FIG. 1 is a conceptual diagram of a vehicle head-up display and image forming device according to one embodiment of the present disclosure. FIG. 2 is a perspective view of an image forming device with the assembly completed according to one embodiment of the present disclosure. FIG. 3 is an exploded perspective view of an image forming device according to one embodiment of the present disclosure. FIG. 4 is a longitudinal cross-sectional view and a partial enlarged view of a housing according to one embodiment of the present disclosure. FIG. 5 is a unidirectional cross-sectional view of a housing according to one embodiment of the present disclosure. FIG. 6 is a plan view of a housing according to one embodiment of the present disclosure. Specific details for implementing the invention

[0015] Some embodiments of the present disclosure are described in detail below with reference to exemplary drawings. It should be noted that in assigning reference numerals to the components of each drawing, the same components are given the same reference numeral whenever possible, even if they are shown in different drawings. Furthermore, in describing the present disclosure, if it is determined that a detailed description of related known components or functions could obscure the essence of the present disclosure, such detailed description is omitted.

[0016] In describing the components of the embodiments according to the present disclosure, symbols such as first, second, i), ii), a), b), etc., may be used. These symbols are intended only to distinguish the components from other components, and the essence, order, or sequence of the components is not limited by the symbols. When a part in the specification is described as 'comprising' or 'having' a component, this means that, unless explicitly stated otherwise, it does not exclude other components but may include additional components.

[0017] FIG. 1 is a conceptual diagram of a vehicle head-up display and image forming device according to one embodiment of the present disclosure.

[0018] Referring to FIG. 1, a vehicle head-up display (1) may include a picture generation device (10) and a plurality of reflection members (20). An image related to vehicle operation information emitted from the picture generation device (10) is reflected by the plurality of reflection members (20). The image reflected by the reflection members (20) is displayed on the vehicle's windshield (30).

[0019] FIG. 2 is a perspective view of an image forming device with the assembly completed according to one embodiment of the present disclosure.

[0020] FIG. 3 is an exploded perspective view of an image forming device according to one embodiment of the present disclosure.

[0021] FIG. 4 is a longitudinal cross-sectional view and a partial enlarged view of a housing according to one embodiment of the present disclosure.

[0022] FIG. 5 is a unidirectional cross-sectional view of a housing according to one embodiment of the present disclosure.

[0023] FIG. 6 is a plan view of a housing according to one embodiment of the present disclosure.

[0024] Referring to FIGS. 2 to 6, an image forming device (10) according to one embodiment of the present disclosure may include a PCB (Printed Circuit Board, 100), an LCD (Liquid crystal Display, 200), a housing (300), a diffuser (400), and a heat sink (500).

[0025] The housing (300) may include a first funnel (310), a second funnel (320), a vent hole (330), an LCD seating (340), a diffuser seating (350), and a PCB fastening part (360).

[0026] The first funnel (310) may include a first funnel input opening (311), a first funnel output opening (312), and a first funnel reflection part (313).

[0027] The second funnel (320) may include a second funnel input side opening (321), a second funnel output side opening (322), and a second funnel reflector.

[0028] A plurality of light sources (110) may be arranged on the PCB (100). The PCB (100) is coupled to one end of the housing (300). Specifically, the PCB (100) and the housing (300) can be coupled using a PCB fastening portion (360) formed on the outer side of the housing (300).

[0029] Multiple light sources (110) emit light so that the LCD (200) emits an image related to the vehicle's driving information. Heat is generated from the multiple light sources (110) that emit light. The light sources (110) may be LEDs (Light Emitting Diodes).

[0030] The LCD (200) emits an image using light transmitted from a light source (110). The image emitted from the LCD (200) is reflected by a plurality of reflective members (20) and displayed on the windshield (30) of the vehicle. The LCD (200) can be placed in an LCD mounting portion (340) formed in a housing (300).

[0031] The housing (300) may be placed between the PCB (100) and the LCD (200). The interior of the housing (300) may be formed as a two-layer reflective structure including a first funnel (310) and a second funnel (320). Specifically, the housing (300) according to one embodiment of the present disclosure includes a plurality of first funnels (310) and a second funnel (320) of a single structure that encompasses all of the plurality of first funnels (310).

[0032] The housing (300) can be manufactured by injection molding using a plastic material such as PC (Polycarbonate) or ABS (Acrylonitrile Butadiene Styrene copolymer). Pigment may be added to the material of the housing (300) to make it white or a color close to white, taking into account light reflection.

[0033] The plastic material used to manufacture the housing (300) may be a material in which fine particles of titanium dioxide (TiO2) are dispersed. The size and content of the titanium dioxide fine particles may be selected so that the inner surface of the housing (300) has appropriate light reflectance and / or reflection characteristics.

[0034] As the housing (300) is manufactured by injection molding using a plastic material in which titanium dioxide microparticles are dispersed, there is no need to form a coating for light reflection on the inner surfaces of the first funnel (310) and the second funnel (320). The light reflection characteristics of the inner surfaces of the first funnel (310) and the second funnel (320) can be controlled by the size and content of the titanium dioxide microparticles. Here, the light reflection characteristics refer to regular reflection (or specular reflection) corresponding to mirror surface reflection and diffuse reflection in which reflected light is diffused.

[0035] Regarding the size of titanium dioxide microparticles and the reflective properties of surfaces containing titanium dioxide, the main reflective properties of the surface are distinguished based on a size of half the wavelength of visible light. Based on a size of 200 to 350 nm, which is half the wavelength of visible light of 400 to 700 nm, specular reflection properties are dominant when the size is smaller than that, for example, 100 nm or less, and diffuse reflection properties are dominant when the size is larger than that, for example, in the range of 500 nm to 5 μm.

[0036] Even if titanium dioxide microparticles are prepared with a size of 200 to 350 nm, larger unit particle sizes may be included due to aggregation or other factors during the microparticle formation process, and the distribution of microparticle sizes may be wide. By selecting and using titanium dioxide microparticles with a size within an appropriate range, the light reflection characteristics of the inner surfaces of the first funnel (310) and the second funnel (320) can be controlled. Methods such as sifting, which are commonly known, may be used for selecting the size of the microparticles.

[0037] One embodiment uses titanium dioxide microparticles with a size in the range of 200 to 350 nm, but is not necessarily limited thereto. For example, a method of controlling the light reflection characteristics of the inner surfaces of the first funnel (310) and the second funnel (320) may also be included by adjusting the surface roughness of the injection molding die, or by performing surface finishing after injection molding.

[0038] The first funnel (310) and the second funnel (320) may be manufactured by injection molding using plastic materials such as PC or ABS. The inner surfaces of the first funnel (310) and the second funnel (320) are formed to have an intended surface roughness, and the inner surfaces of the first funnel (310) and the second funnel (320) may be coated with metal to increase light reflection efficiency.

[0039] The radiation pattern from the chip face of an LED has a Lambertian radiation pattern. In most commercial LEDs, the radiation pattern is adjusted to an intended shape by waveguides within the LED element or microstructures acting as lenses placed on the element. Consequently, the radiation pattern of an LED varies depending on the manufacturer. The radiation pattern of an LED can take various shapes, such as hot air balloon shape, cocoon shape, cone shape, or ellipsoid shape.

[0040] The shapes of the first funnel (310) and the second funnel (320) can be formed by taking into account the light radiation pattern of the light source (110). A plurality of first funnels (310) arranged adjacent to the light source (110) can be formed in various shapes by taking into account the light radiation pattern of the light source (110).

[0041] The first funnel (310) may include a first funnel input side opening (311), a first funnel output side opening (312), and a first funnel reflection part (313). The second funnel (320) may include a second funnel input side opening (321), a second funnel output side opening (322), and a second funnel reflection part (323).

[0042] A plurality of first funnel input side openings (311) are formed corresponding to each of the plurality of light sources (110) arranged on the PCB (100). The first funnel input side openings (311) are formed with a size larger than the corresponding light source (110). The center of the first funnel input side openings (311) may be formed to coincide with the center of the light source (110). The output specifications, number, and arrangement of the light sources (110) may be selected by considering the amount of light required for the head-up display (1) and the size of the LCD (200).

[0043] A plurality of first funnel output-side openings (312) are formed such that the overall rim shape corresponds to the second funnel input-side opening (321). The outer shape formed by the plurality of first funnel output-side openings (312) and the second funnel input-side opening (321) are smoothly connected to each other.

[0044] The second funnel output side opening (322) is formed to correspond to the image area of ​​the LCD (200).

[0045] A diffuser mounting portion (350) may be formed in the shape of a stepped portion at the top of the second funnel output side opening (322). An LCD mounting portion (340) may be formed at the top of the diffuser mounting portion (350). The LCD mounting portion (340) may be formed at an angle of 10° or more and 30° or less with respect to the PCB (100) or the diffuser mounting portion (350). As the LCD mounting portion (340) is formed at an angle of 10° or more and 30° or less with respect to the PCB (100) or the diffuser mounting portion (350), the degradation of the image quality of the image forming device (10) due to sunlight can be prevented. A PCB fastening portion (360) may be formed on the outer side of the housing (300) so that the housing (300) and the PCB (100) are coupled.

[0046] Consequently, the housing (300) may include a plurality of first funnels (310) formed on the side of the light source (110), a single second funnel (320) formed on the side of the LCD (200), a diffuser mounting portion (350) formed between the second funnel output side opening (322) and the LCD (200), an LCD mounting portion (340) formed on the upper side of the diffuser mounting portion (350), and a PCB fastening portion (360) formed on the outer side of the housing (300).

[0047] Light transmitted from multiple light sources (110) is guided to a second funnel (320) using multiple first funnels (310), mixed with one another in the second funnel (320), passes through a diffuser (400), and then enters the rear of the LCD (200).

[0048] The inner surfaces of the first funnel (310) and the second funnel (320) may be formed such that the light reflectivity is 80% or more and 95% or less. The inner surfaces of the first funnel (310) and the second funnel (320) may be formed to include both the characteristics of a specular reflection surface and the characteristics of a diffuse reflection surface.

[0049] The first funnel (310) and the second funnel (320) may be formed in different shapes by considering the light radiation pattern of the light source (110) and the reflection characteristics of the inner surfaces of the first funnel (310) and the second funnel (320). For example, they may be designed to provide performance such as the light diffusion angle range required for the head-up display (1) and light homogeneity in the LCD (200) image area using computational simulation such as the Monte-Carlo optical ray-tracing method.

[0050] The internal structure of the housing (300) can be designed so that light emitted from a plurality of light sources (110) passes through the first funnel (310) and the second funnel (320), and the diffusely reflected light and specularly reflected light are mixed so that the cross-section of the light is rectangular similar to that of the LCD (200) and the light intensity is uniform, and is incident on the rear of the LCD (200) in the form of flat light.

[0051] By forming the housing (300) into a double-funnel structure including a first funnel (310) and a second funnel (320), the need for a prism sheet to increase light utilization efficiency can be eliminated.

[0052] The first funnel (310) and the second funnel (320) may be formed with a rectangular input side opening and an output side opening, and a rectangular cross-section that expands and extends from the input side opening to the output side opening. The cross-section of light passing through the first funnel (310) and the second funnel (320) and incident on the LCD (200) may be formed in a rectangular shape to match the shape of the LCD (200).

[0053] The light emitted from the light source (110) does not maintain a square cross-section in the path from the first funnel input side opening (311) to the second funnel output side opening (322). This is because even if the shape of the light source (110) is square, the light emitted from the light source (110) is radiated in a 360-degree direction from each local light starting point and has a Lambertian radiation shape.

[0054] The Lambertian radiation pattern has a Gaussian distribution in which the density of the light cross-section is highest along the central axis of the light and decreases towards the periphery. For example, the radiation pattern of the light may be a distribution in which 90% of the luminous intensity is concentrated in a range of ±20 degrees relative to the primary optical axis in front of the light source (110), and 50% of the luminous intensity is included in a range of ±60 degrees. The three-dimensional distribution of light density in the area in front of the light source (110) may vary depending on the type of light source (110).

[0055] The cross-section of the first funnel (310), the cross-section of the second funnel (320), the first funnel reflector (313), and the second funnel reflector (323) may be formed in a shape other than a rectangle to improve the uniformity of light incident on the LCD (200).

[0056] The first funnel input side opening (311) is basically a rectangular shape, but each side may be a curved shape that is concave toward the center of the rectangle. The cross-sectional shape of the first funnel input side opening (311) may be a shape in which four concave curves, each with a central part close to the center optical axis of the light source (110), are arranged in a rectangular shape.

[0057] The first funnel output side opening (312) may also be formed in a shape similar to the first funnel input side opening (311). However, the degree of concave indentation on each side of the first funnel output side opening (312) may be smaller than that of the first funnel input side opening (311). The reflective surface of the first funnel reflector (313) connecting the first funnel input side opening (311) and the first funnel output side opening (312) may be formed in a convex curved shape toward the central axis of the first funnel (310).

[0058] Light having a Lambertian radiation shape is specularly reflected and diffusely reflected by the first funnel reflector (313) having a convex curved shape, thereby allowing the cross-section of the light to be guided from a circular shape to a square shape so as to have a uniform light density at the first funnel output side opening (312). Among the surface reflection characteristics, the specular reflection characteristic will determine the overall light pattern, and the diffuse reflection characteristic will contribute to light intensity averaging due to the spreading of reflected light.

[0059] The shape of the second funnel input side opening (321) may correspond to the shape formed by a plurality of first funnel output side openings (312), and the shape of the second funnel output side opening (322) may correspond to the shape of the LCD (200). The second funnel reflector (323) may have a concave shape so that light incident on the LCD (200) is perpendicular to the rear surface of the LCD (200).

[0060] Rather than superpositioning multiple circular cross-sectional light patterns to form a single uniform square cross-sectional light pattern, it would be advantageous to superimpose multiple square cross-sectional light patterns to ensure uniformity of the light pattern. As the light cross-sectional pattern is guided into a square shape by multiple first funnels (310), the uniformity of light density of the multiple light patterns mixed in the second funnel (320) can be more easily ensured.

[0061] The cross-sectional shape of the first funnel input side opening (311) is basically a rectangular shape, but each side may be a curved shape that is convex outward from the center of the rectangle. The cross-sectional shape of the first funnel input side opening (311) may be a shape in which four convex curves, with the central part being far from the center optical axis of the light source (110), are arranged in a rectangular shape.

[0062] The first funnel (310) and the second funnel (320) are not necessarily formed in the shape described above, but can be formed in various shapes by considering the light radiation pattern of the light source (110) and the surface reflection characteristics of the first funnel (310) and the second funnel (320).

[0063] The first funnel reflector (313) may be formed to have a specific shape in the front and rear directions of the first funnel reflector (313) so as to limit the range of light diffusion angles and provide a directional or collimating effect to the light incident on the rear of the LCD (200).

[0064] The first funnel reflection section (313) can be formed by morphing the cross-sectional shape of the first funnel input side opening (311) into the cross-sectional shape of the first funnel output side opening (312) according to the first scaling ratio. Here, morphing means that the cross-sectional shape of the first funnel input side opening (311) continuously changes into the cross-sectional shape of the first funnel output side opening (312).

[0065] For example, if the cross-section of the first funnel input side opening (311) has four sides that are concave and the cross-section of the first funnel output side opening (312) is rectangular, the concave cross-section of the first funnel reflector (313) can gradually flatten out as it moves forward from the first funnel input side opening (311) and become a straight line shape at the position of the first funnel output side opening (312).

[0066] When the first magnification rate is constant, the first funnel reflection part (313) may have a shape in which the cross-sectional shape of the first funnel input side opening (311) is morphed and magnified at a constant rate.

[0067] When the first magnification rate decreases and then increases, the first funnel reflector (313) can be formed in a convex shape from the first funnel input side opening (311) to the first funnel output side opening (312) when viewed from the light source (110) side.

[0068] When the first magnification rate increases and then decreases, the first funnel reflection part (313) can be formed in a concave shape from the first funnel input side opening (311) to the first funnel output side opening (312) when viewed from the light source side.

[0069] The first funnel reflector (313) may be formed to have a concave parabolic surface in the direction from the first funnel input side opening (311) to the first funnel output side opening (312). By forming the first funnel reflector (313) to have a concave parabolic surface, a collimation effect may be imparted to at least a portion of the light emitted from the first funnel output side opening (312), or the directionality of the light emitted from the first funnel output side opening (312) may be enhanced.

[0070] An image forming device (10) according to one embodiment of the present disclosure includes a first funnel (310) and a second funnel (320), wherein at least a portion of the first funnel (310) may be arranged such that the central optical axis is inclined with respect to the main optical axis of the entire housing (300).

[0071] A plurality of first funnels (310) arranged in the longitudinal direction of the housing (300) can be formed such that their respective central optical axes are tilted at a greater angle from the main optical axis of the housing (300) as they move further away from the center of the plurality of first funnels (310).

[0072] A first funnel (310) positioned in the center in a rectangular direction can be formed such that its central optical axis is parallel to the main optical axis of the housing (300). As the first funnel (310) is positioned outward from the center, the central optical axis of each first funnel (310) can be formed to be tilted further outward from the main optical axis of the housing (300).

[0073] Even in the case of a unidirectional configuration, as it is positioned outward from the central first funnel (310), the central optical axis of each first funnel (310) can be formed to be tilted further outward from the main optical axis of the housing (300).

[0074] The second funnel (320) can be formed to uniformly mix light incident from a plurality of first funnels (310) and to have an appropriate light emission angle range for the light transmitted to the LCD (200).

[0075] The angle of arrangement of the central optical axis of each of the first funnels (310) may be ±14° in the long-side direction and ±6° in the short-side direction.

[0076] The arrangement angle range and arrangement position range of the optical axis of the first funnel (310) can be selected by considering the diffusion angle range and uniformity of light incident from the second funnel output side opening (322) to the LCD (200).

[0077] Since a plurality of first funnels (310) are formed in the housing (300) such that each has a central optical axis at a different angle, the overall height of the housing (300) can be easily reduced.

[0078] It is well known that a parabolic mirror, which uses a parabolic surface obtained by placing a single light source at the focus of a parabola and rotating the parabola around its axis as its reflective surface, reflects light in a collimated shape toward the front.

[0079] The head-up display (1) needs to be displayed with a high amount of light that is easy to identify even under daylight. When providing a high amount of light from a single light source, heat generated from the light source may be a problem. Multiple light sources (110) can be used to control the heat generated from the light source to an appropriate level.

[0080] Multiple light sources (110) may be widely arranged on the PCB (100) and formed to have a central optical axis in a direction perpendicular to the PCB (100). Even if the light emitted from the multiple light sources (110) is reflected on a single parabolic surface, it may not be easy to secure collimation characteristics or directionality.

[0081] In an image forming device (10) according to one embodiment of the present disclosure, a plurality of first funnels (310) are formed to be tilted according to the position where each center optical axis is arranged. By forming the center optical axis of each of the plurality of first funnels (310) to be tilted, a plurality of light sources (110) can provide a light emission pattern similar to a single light source arranged further back to a second funnel (320).

[0082] Consequently, an image forming device (10) according to one embodiment of the present disclosure includes a plurality of first funnels (310) such that a plurality of light sources (110) are positioned in front of a parabolic focal position of a second funnel (320), and a single light source is positioned at the parabolic focal position of the second funnel (320) to provide a light emission pattern to the second funnel (320). Since the housing (300) of the image forming device (10) is formed as a reflective structure including the first funnel (310) and the second funnel (320), the overall height of the housing (300) can be significantly reduced.

[0083] The height of the housing (300) reflective structure including the first funnel (310) and the second funnel (320) can be formed to be 26 mm or less.

[0084] FIG. 4 is a longitudinal cross-sectional view and a partial enlarged view of a housing according to one embodiment of the present disclosure.

[0085] FIG. 5 is a unidirectional cross-sectional view of a housing according to one embodiment of the present disclosure.

[0086] With reference to FIGS. 4 and FIGS. 5, the shape of the vent hole (330) and the heat dissipation effect according to one embodiment of the present disclosure will be described in detail.

[0087] A vent hole (330) may be formed between the LCD mounting portion (340) and the diffuser mounting portion (350) of the housing (300). There may be multiple vent holes (330). Multiple vent holes (330) may be formed on the side or rear of the housing (300). By forming multiple vent holes (330) in the housing (300), heat inside the housing (300) can be smoothly released to the outside. The vent holes (330) may be formed in a circular, triangular, or square shape. To increase the structural rigidity of the housing (300), the multiple vent holes (330) may each be formed in a divided manner.

[0088] The temperature inside the housing (300) rises due to heat generated from the light source (110), and the LCD (200), which is a main component of the image forming device (10), may be heated. As the LCD (200) is heated, the temperature reliability of the LCD (200) may be reduced. By using a plurality of vent holes (330) formed in the housing (300), the heat generated from the light source (110) is smoothly discharged to the outside of the housing (300), thereby having the effect of improving the reliability of the LCD (200).

[0089] An image forming device (10) according to one embodiment of the present disclosure includes a housing (300) having a function of accommodating parts, a function of concentrating light, and a function of dissipating heat, thereby reducing the manufacturing cost of various parts and enabling commonality of the image forming device (10) according to vehicle type.

[0090] The above description is merely an illustrative explanation of the technical concept of the present embodiment, and a person skilled in the art to which the present embodiment belongs would be able to make various modifications and variations within the scope of the essential characteristics of the present embodiment. Accordingly, the present embodiments are intended to explain, not limit, the technical concept of the present embodiment, and the scope of the technical concept of the present embodiment is not limited by these embodiments. The scope of protection of the present embodiment shall be interpreted by the claims below, and all technical concepts within an equivalent scope shall be interpreted as being included within the scope of rights of the present embodiment. Explanation of the symbols

[0091] 1: Head-up display 10: Image forming device 20: Reflective element 30: Windshield 100: PCB 110: Light source 200: LCD 300: Housing 310: First funnel 311: First funnel input side opening 312: First funnel output side opening 313: First funnel reflector 320: Second funnel 321: Second funnel input side opening 322: Second funnel output side opening 323: Second funnel reflector 330: Vent hole 340: LCD mounting area 350: Diffuser mounting section 360: PCB connection section 400: Diffuser 500: Heat sink

Claims

Claim 1 A Printed Circuit Board (PCB) on which one or more light sources are arranged; a Liquid Crystal Display (LCD) that emits an image using light transmitted from the one or more light sources; and a housing disposed between the PCB and the LCD, wherein the housing comprises: one or more first funnels each disposed corresponding to the one or more light sources; a second funnel disposed above the first funnel in a shape that encompasses the one or more first funnels; and a diffuser mounting portion formed in the shape of a stepped portion above the second funnel. An image forming device comprising one or more vent holes disposed between the diffuser mounting portion and the LCD and discharging heat inside the housing to the outside, wherein each of the one or more first funnels is formed to have a central optical axis having a different shape and a different angle depending on the position in which they are disposed, and includes an inner surface having a light reflectance of 80% or more and 95% or less, wherein each of the central optical axes is formed to be inclined at a larger angle from the main optical axis of the housing as it moves further away from the center of the entire one or more first funnels, and each of the one or more vent holes is formed spaced apart on the side or rear of the housing. Claim 2 In claim 1, the housing is an image forming device formed of a plastic material in which titanium dioxide (TiO2) fine particles are dispersed. Claim 3 An image forming device according to claim 2, wherein the light reflectance of the inner surface of the second funnel is 80% or more and 95% or less. Claim 4 In claim 2, the plastic material is an image forming device in which PC (Polycarbonate) or ABS (Acrylonitrile Butadiene Styrene copolymer). Claim 5 delete Claim 6 An image forming device according to claim 1, wherein the first funnel comprises: a first funnel input side opening; a first funnel output side opening formed with a cross-section larger than the cross-section of the first funnel input side opening; and a first funnel reflector connecting the first funnel input side opening and the first funnel output side opening. Claim 7 In claim 6, the image forming device wherein the cross-sectional shape of the first funnel input side opening is rectangular. Claim 8 In claim 6, the image forming device wherein the cross-sectional shape of the first funnel output side opening is rectangular. Claim 9 In claim 6, the cross-sectional shape of the first funnel input side opening is an image forming device in which four concave curves, with a central portion close to the light source, are arranged in a rectangular shape. Claim 10 In claim 6, the cross-sectional shape of the first funnel input side opening is a shape in which four convex curves, with the central part being far from the light source, are arranged in a rectangular shape, forming an image forming device. Claim 11 An image forming device according to claim 1, wherein the second funnel comprises: a second funnel input side opening; a second funnel output side opening formed with a cross-section larger than the cross-section of the second funnel input side opening; and a second funnel reflector connecting the second funnel input side opening and the second funnel output side opening. Claim 12 In claim 1, an image forming device having an LCD mounting portion formed in the housing so that the LCD is placed thereon. Claim 13 In claim 12, the LCD mounting portion is an image forming device formed at an angle of 10° or more and 30° or less with respect to the PCB. Claim 14 delete Claim 15 An image forming device according to claim 1, wherein a PCB fastening portion is formed on the outer side of the housing to combine the housing and the PCB. Claim 16 In claim 1, the image forming device wherein the vent hole is formed in a circular, triangular, or square shape. Claim 17 An image forming device according to claim 1, wherein the height of the reflection structure of the housing including the first funnel and the second funnel is 26 mm or less.

Images