TWI626472B - High efficiency head-up display illumination system using three primary color sources - Google Patents

Abstract

A high-efficiency head-up display illumination system using a three primary color light source, which is a light source group consisting of at least one set of red (R), green (G), and blue (B) monochromatic light sources, which are emitted through a collimating lens, via A specially configured microlens array directs the light beam into a color filter in a liquid crystal display having dense and regular receiving red (R), green (G), blue (B) a color point of light, which is respectively aligned with three liquid crystal display units representing R, G, and B image outputs in each pixel (Pixel) of the liquid crystal display; wherein the microlens array has a dense number of lens units and a liquid crystal display The total number of pixels (Pixel) is the same and aligned, so that the three colors can each penetrate the red (R), green (G), and blue (B) color points on the color filter without being significantly absorbed, resulting in transmittance. Significantly improved; and the color saturation of the liquid crystal display is better, and the color triangle is larger, and the diffusion sheet is not required, which significantly improves the directivity and brightness of the illumination system.

Description

High efficiency head-up display illumination system using three primary color light sources

The present invention relates to a high efficiency head-up display illumination system using a three primary color light source, and more particularly to an illumination system that is particularly suitable for use in a vehicle head-up display.

Head Up Display (hereinafter referred to as HUD) is composed of a virtual projection system (Box) and a light combiner (Combiner). It was installed on the fighter aircraft at an early stage. The pilot can watch the front through the optical synthesizer. Scenery, and the virtual image information projected by the device, without having to look down on the dashboard, due to the continuous advancement of technology, the more advanced automotive industry has gradually adopted the HUD system, and in the HUD system, how to reduce the waste of the light source, provide enough The brightness, reducing power consumption, reducing heat dissipation requirements, and the reliability of the HUD system are particularly important in the harsh environmental conditions of the vehicle system. Therefore, the design of HUD's lighting system needs to be carefully researched and developed to take it to the next level.

The conventional head-up display illumination system, as shown in Figures 5 and 6, includes: a plurality of illumination sources 60, each of which is covered by a white light source of the light-emitting diode 602 with a collecting cup 601 After the light emitting diode 602 emits the light source, the light is emitted outward through the collecting cup 601; since the light emitting diode 602 is a small area of the Lambertian light source, the luminous intensity and the light emitting angle It has a cosine relationship, and the function of the collecting cup 601 is to condense the diffused light source of the light-emitting diode 602 to form a small angle with a directionality, which is closer. The large area of the parallel light (the size of the exit of the collecting cup) is a direct light source.

A light guide 61 is configured to accommodate the light source 60. The light guide column is a hollow cylinder with a high reflectivity mirror surface. In the present case, the lower side is the light incident surface, and the upper side is the light emitting surface. The light from the light source 60 can be mixed through the light emitted from each of the collecting cups 601 to achieve uniform mixing, and the light is emitted in the direction of the light emitting surface of the light guiding rod 61.

A diffusion sheet 62 is disposed at the other end of the light guiding rod 61 (ie, the light emitting surface), and the effect of adding the diffusion sheet 62 is to diffuse the light emitted from the light emitting surface of the light guiding column 61 to an appropriate angle to form a uniform surface light source. A backlight used to fill the rear LCD panel 63 constitutes a conventional illumination system.

However, in the conventional technology, the light source 60 is covered with a light-emitting diode 602 of a white light source, and a light collecting cup 601 is shielded. The light is reflected forward, and the energy is consumed, and the diffusion sheet 62 is added. The illumination light changes evenly and softly; however, the angle is also diffused, and it is difficult to concentrate on a specific angle (the angle of view of the HUD) and the visible range of the HUD (Eye-box), which causes a waste of luminosity in the use of the HUD, and is used The white light source of the illumination system is further absorbed by the color filter in the rear liquid crystal display, and the intensity of the light source is further weakened, and the light is easily diffused and difficult to concentrate. This is a major disadvantage of the conventional use, so the HUD needs a better illumination system. Make HUD more quality and more competitive.

The main object of the present invention is to emit a light source group consisting of a single color source of three colors of red (R), green (G), and blue (B), through a collimating lens, via a set of specially arranged microlens arrays. Introducing a light beam into a color filter in a liquid crystal display, the color filter It has dense and regular color points for receiving red (R), green (G), and blue (B) light. The color points are respectively aligned with the three pixels of the liquid crystal display (Pixel) representing the R, G, and B image outputs. Liquid crystal display unit; wherein the microlens array has a dense number of lens units and is aligned and aligned with the total number of pixels (Pixel) on the liquid crystal display, so that the three colors can respectively penetrate the red (R), green color on the color filter (G), blue (B) color point is not significantly absorbed, resulting in a substantial increase in penetration; and the liquid crystal display color saturation is better, and the color triangle is larger, and does not require a diffuser, significantly improved The brightness of the lighting system and the waste of the light source.

To achieve the above objects, the present invention can be achieved in the following manner:

The invention comprises at least: a light source group comprising three monochromatic light sources of red, green and blue, respectively capable of directing the light beam to the front; and a collimating lens disposed in front of the monochromatic light sources of the light source group, so that the light can be a plurality of microlens arrays are formed by a light-transmitting material, and are respectively disposed on the light-incident surface and the light-emitting surface which are disposed in parallel with each other, and are respectively provided with opposite lens array surfaces. Each of the lens array faces is formed with a plurality of consecutive and closely arranged lens units; when the light of the light source group is incident on the first unit plate of the microlens array through the collimating lens, the lens unit can be changed. The incident light beam is divided into a concentrated light beam in the direction of R, G, and B, and is projected onto each corresponding lens unit on the second lens array surface on the light exiting side; each of the second lens array faces The corresponding lens unit can change the direction of each beam so that each R, G, B concentrated light beam is emitted in the vertical direction; a color filter (which can be located in the liquid crystal display or can be separately set) is placed in the micro Lens array On the light side, the color filter is provided with a dense and regular color point for receiving red, green and blue light, and the pixel composed of the color point is respectively aligned with the red, green and blue image output of each pixel of the liquid crystal display. Three liquid crystal display units; and the above microlens array has a dense number of lens units and a total number of pixels on the liquid crystal display The numbers are the same and aligned so that the three color beams can each penetrate the red, green, and blue color points on the color filter to increase the color saturation and brightness of the liquid crystal display.

[Use]

60‧‧‧Light source

601‧‧‧Spotlight

602‧‧‧Lighting diode

61‧‧‧Light guide

62‧‧‧Diffuser

63‧‧‧ panel

〔this invention〕

10‧‧‧Light source group

11‧‧‧monochromatic light source

12‧‧‧Monochrome light source

13‧‧‧monochromatic light source

20‧‧‧ Collimating lens

30‧‧‧Microlens array

30'‧‧‧Microlens Array

31‧‧‧ lens array surface

31'‧‧‧ lens array surface

310‧‧‧ lens unit

32‧‧‧ lens array surface

32'‧‧‧ lens array surface

320‧‧‧ lens unit

40‧‧‧Color filters

41‧‧‧ pixels

41R‧‧‧ color point

41G‧‧‧ color point

41B‧‧‧ color point

50‧‧‧LCD display

L‧‧‧beam

L0‧‧‧beam

L1‧‧‧ Beam

L2‧‧‧ beam

Figure 1 is a schematic view of the planar structure of the present invention.

Figure 2 is a schematic view of the three-dimensional structure of the present invention.

Figure 3 is a schematic view showing a second embodiment of the microlens array of the present invention and a three-dimensional assembly.

Fig. 4 is a schematic view showing an embodiment of the light source of the present invention used in parallel.

Figure 5 is an exploded view of the light source system of a conventional head-up display.

Figure 6 is a cross-sectional view of a light source system of a conventional head-up display.

The structure of the head-up display of the present invention is shown in FIG. 1 as a plan view of a unit of the system of the present invention, and FIG. 2 is a perspective view of the unit of the present invention, comprising at least one light source group 10 including three single colors. The light sources 11, 12, 13, the preferred embodiment are red (R), green (G), blue (B) three-color light-emitting diode (LED) or laser diode light source, respectively, the beam L is directed to the front; in order to enable the light to be emitted in parallel forward, a collimating lens 20 may be disposed in front of the monochromatic light sources 11, 12, 13 of the light source group 10, and the collimating lens 20 may be increased according to actual needs. The quantity, usually designed with both efficiency and space-free requirements, is one or two common patterns, but the schema of this case is only indicated by one.

A set of microlens arrays 30 are transparent block-shaped structures, and are respectively provided with opposite lens array faces 31, 32 on the light incident surface and the light exiting surface which are arranged in parallel with each other. The lens array faces 31, 32 are respectively formed with a plurality of continuous and closely arranged lens units 310, 320, wherein the lens units 310, 320 shown in FIG. 2 are a plurality of closely arranged rectangular units; the two lenses of the microlens array 30 Between the array faces 31 and 32, the light beams L1, L0, and L2 can be directly passed through the light-transmitting material; the microlens array 30 can be integrally formed by a transparent material; for example, as shown in Figures 1 and 2 The embodiment of the microlens array 30, when the red (R), green (G), and blue (B) monochromatic light sources 11, 12, 13 of the light source group 10 emit the light beam L toward the front, through the collimating lens 20 The lens unit 310, which is incident on the first lens array face 31 of the microlens array 30, can converge the light beams L1, L0, L2 and project to the opposite lens unit 320 on the second lens array face 32. on.

Referring to Figures 1 and 2, a color filter 40 is disposed outside the second lens array face 32 on the light exit side of the microlens array 30. The color filter 40 is provided with dense and regular reception. The color points 41R, 41G, and 41B of the red (R), green (G), and blue (B) lights (that is, the left enlarged view of Fig. 1), and the pixels 41 composed of the color points 41R, 41G, and 41B (i. Pixel) is respectively aligning three liquid crystal display units (not shown) representing red (R), green (G), and blue (B) image outputs in each pixel (Pixel) of the liquid crystal display 50; wherein the microlens The array 30 has dense lens units 310, the number of which is the same as the total number of pixels on the liquid crystal display (Pixel), so that the three color light beams L1, L0, L2 can each converge and penetrate the red (R) on the color filter 40. The color points 41R, 41G, and 41B of green (G) and blue (B) make the color saturation of the liquid crystal display 50 better, and the color triangle is larger, and the directionality is good, and the diffusion sheet is not required, which significantly improves the illumination system. Brightness.

The collimating lens 20 disposed in front of the light source group 10 may be a single large lens or a lens array composed of a plurality of small collimating lenses. However, those skilled in the art can easily modify and modify according to the present invention. Let's take a look at the diagram again.

Referring to FIG. 2, the lens units 310, 320 on the front and rear lens array faces 31, 32 of the microlens array 30 are a plurality of rectangular lenses, and can collect an appropriate amount of light to be projected on the color filter 40 in a row. The pixel 41; but under the premise that the light source group 10, the collimator lens 20, and the color filter 40 are unchanged, the microlens array 30 can be changed into the microlens array 30' as shown in FIG. The lens units 310', 320' on the front and rear lens array faces 31', 32' of the microlens array 30' are an elongated cylindrical lens, and the width of the cylindrical lens can directly cover the upper row of the color filter R. , the opposite pixels of G, B, that is, each of the pixels 41 composed of red (R), green (G), and blue (B) color points 41R, 41G, 41B on the color filter 40, Can achieve the desired effect.

Referring to Figures 1 and 4, in the implementation of the present invention, it can be juxtaposed into a densely distributed light source for projection, and an array of one (or several) collimating lenses 20 is used to obtain better color saturation. Light is not consumed by excessive lighting systems.

Referring to Figures 1 and 2, since the present invention is in use, the red (R), green (G), and blue (B) monochromatic light sources 11, 12, 13 of the light source group 10 emit light beams. Forward, the collimating lens 20 forms parallel light and then enters the lens unit 310 closely arranged on the first lens array surface 31 of the microlens array 30, so that the light beams L1, L0, L2 are respectively condensed and projected to the first On the lens unit 320 on the two lens array faces 32; since the microlens array 30 has dense lens units 310, the number of 320 is the same as the total number of pixels on the liquid crystal display (Pixel), so that the three color light beams L1, L0, L2 are concentrated. The color points 41R, 41G, and 41B of the red (R), green (G), and blue (B) colors of the color filter 40 can be respectively penetrated, so that the color saturation of the liquid crystal display 50 is better, and the light is not consumed. Too much is the main advantage of the present invention.

In addition, since the light source group 10 of the present invention corresponds to the opposite pixels 41 in three colors, Therefore, the color saturation of the three colors of red (R), green (G), and blue (B) is better, and the color gamma is larger, which is another advantage of the present invention.

The present invention does not have a diffuser arrangement as conventionally used, so that the light source is not consumed in a large amount. According to actual tests, in the case of the light-emitting diode, the light transmittance of the present invention is a conventional specification (less than 5%). Two to three times as many advantages of the present invention.

The above-mentioned structures are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention; therefore, equivalents or modifications may be made without departing from the invention. Equal changes and modifications made in the spirit and scope, such as adding other accessories, or slightly changing the size, or changing the number of lens units in the microlens array, or material changes, but the overall structure is unchanged, should cover Within the features of the invention.

Claims (7)

A high-efficiency head-up display illumination system using a three primary color light source, comprising at least: a light source group comprising three monochromatic light sources of red, green and blue, and arranged in a side by side manner, respectively capable of directing the light beam to the front; and at the light source A pair of monochromatic light sources are provided with a collimating lens in front of the monochromatic light source to enable the light to be emitted in parallel forward; a set of microlens arrays are formed of a light-transmissive material and are arranged in parallel with each other. On the surface and the light-emitting surface, there are respectively arranged lens array surfaces, and each of the lens array surfaces respectively forms a plurality of continuous and closely arranged lens units; when the light of the light source group is incident from the light-in side through the collimating lens In the case of the microlens array, the closely arranged lens units on the first lens array surface on the side can separate the incident light beams into three concentrated light beams of red, green and blue, and project to the second side of the light exiting side. Each corresponding lens unit on the surface of the lens array; each corresponding lens unit on the surface of the second lens array can change the direction of each light beam, so that each red, green and blue color The light beam is emitted in a vertical direction; a color filter is disposed on a liquid crystal display panel and is disposed on the light exiting side of the microlens array, and the color filter is provided with dense and regular receiving red, green, and blue light. a color point, the pixel composed of the color point is respectively aligned with three liquid crystal display units representing red, green, and blue image outputs in each pixel of the liquid crystal display; and the microlens array has a dense number of lens units and a liquid crystal display The total number of pixels is the same and aligned, and guided by the microlens array, so that the three color light beams can respectively penetrate the red, green and blue color points on the color filter without being obviously absorbed, thereby achieving the transmittance improvement and the color saturation degree. improve. A high-efficiency head-up display illumination system using a three primary color light source as described in claim 1, wherein the microlens array is made of a transparent material and is integrally formed. A high efficiency head-up display illumination system using a three primary color light source as described in claim 1, wherein the collimating lens is a single lens. A high efficiency head-up display illumination system using a three primary color light source as described in claim 1, wherein the collimating lens is composed of a plurality of lenses. A high-efficiency head-up display illumination system using a three primary color light source as described in claim 1, wherein the monochromatic light source of the light source group is one of a light-emitting diode or a laser diode source. A high-efficiency head-up display illumination system using a three primary color light source as described in claim 1, wherein the light source group is composed of a plurality of light sources, respectively, and is composed of red, green, and blue light sources. The high-efficiency head-up display illumination system using the three primary color light source according to claim 1, wherein the lens unit on the two lens array surface of the microlens array is an elongated cylindrical lens, and the width of the cylindrical lens is just It can cover pixels of a row of red, green and blue dots on a color filter.