Display assembly and gear shifter

Abstract

The utility model provides a display assembly and a gear shifter. The display assembly includes a plurality of light sources and a light guide. The light guide part comprises a plurality of light guide pieces which are arranged in a layered mode, the light guide pieces are stacked together, each light guide piece is provided with a pattern, the light guide pieces correspond to the light sources in a one-to-one mode, each light guide piece is provided with a light inlet part right facing the corresponding light source, and the light inlet parts face the light sources in the stacking direction of the light guide pieces. And the light incident part of at least one light guide sheet and the light incident parts of other light guide sheets are arranged in a staggered manner. According to the display assembly, the same display effect can be achieved, meanwhile, the cost is also optimized, and the display effect of the light guide pieces with different light guide parts is further clearer.

Description

Technical Field

[0001] The present application relates to the field of vehicles, and in particular, to a display assembly and a gear shifter. Background Art

[0002] With the advent of the electric and intelligent era of automobiles, the cabin atmosphere and information presentation are becoming more intelligent and diverse. To meet the needs of intelligent cockpits and the ever-increasing demand for a superior driving experience, the driver's direct-control shifter has been enhanced in terms of shifting experience and ritual. The gear position display provides intuitive guidance as the driver operates the shifter. Enhancing the sense of ritual and technology in the gear position display enhances the overall experience of the cockpit. Utility Model Content

[0003] The present application provides a display assembly and a shifter, which can achieve the same display effect while optimizing the cost, and further make the display effect of light guide sheets with different light guide parts clearer.

[0004] Specifically, this application is implemented through the following technical solutions:

[0005] The present application provides a display assembly, comprising

[0006] Multiple light sources;

[0007] The light guide comprises a plurality of light guide plates arranged in layers, and the plurality of light guide plates are stacked together, each of the light guide plates is provided with a pattern, the plurality of light guide plates correspond one-to-one to the plurality of light sources, and each of the light guide plates is provided with a light entrance portion facing the light source, and along the stacking direction of the plurality of light guide plates, the light entrance portion of at least one light guide plate is staggered with the light entrance portions of other light guide plates.

[0008] Optionally, the light incident portions of the light guide plates are staggered with respect to each other.

[0009] Optionally, the light entrance portions of the light guide plates are arranged on the same side, and the light entrance portions are staggered with each other on the side.

[0010] Optionally, the display assembly further includes a fixing bracket, the plurality of light guide plates are assembled on the fixing bracket, the fixing bracket is provided with a light source hole corresponding to the light incident portion, and the light source is arranged corresponding to the light source hole.

[0011] Optionally, one of the light entrance portions is a first light entrance portion, and the first light entrance portion is provided with a protrusion, which protrudes from an edge in a direction parallel to the light guide plate, and the protrusion is provided in the light source hole.

[0012] Optionally, the fixed bracket is provided with a plurality of the light source holes, each of the light source holes corresponds one-to-one to each of the light entrance portions, and each light entrance portion is provided with a protrusion protruding from the edge of the light guide along a direction parallel to the light guide plate, and each of the light sources and each of the protrusions is arranged in each of the light source holes.

[0013] Optionally, the multiple light source holes are arranged on the same side of the fixing bracket, and the display component also includes a circuit board provided with multiple light sources, the circuit board is fixed to the outside of the fixing bracket, and the multiple light sources are opposite to the protrusions through the light source holes.

[0014] Optionally, along the stacking direction of the plurality of light guide sheets, the display assembly further includes a capacitor film stacked on the outside of the light guide member, and the capacitor film is electrically connected to the circuit board.

[0015] Optionally, the fixing bracket is provided with multiple layers of slots, and the multiple light guides are plugged into the slots of each layer in a one-to-one correspondence.

[0016] Optionally, the display assembly further includes a mounting seat and a protective cover, which are respectively arranged on two side surfaces of the light guide member along the stacking direction of the plurality of light guide sheets, and the mounting seat and the protective cover are both fixedly connected to the fixing bracket.

[0017] Another aspect of the present application provides a shifter, comprising any of the display components described above;

[0018] The plurality of light guide sheets at least include a first light guide sheet, a second light guide sheet, and a third light guide sheet; the plurality of light sources at least include a first light source corresponding to the first light guide sheet, a second light source corresponding to the second light guide sheet, and a third light source corresponding to the third light guide sheet; the first light guide sheet is engraved with a forward gear mark, the second light guide sheet is engraved with a neutral gear mark, and the third light guide sheet is engraved with a reverse gear mark;

[0019] When the shifter is switched to the forward gear, the first light source is controlled to emit light; when the shifter is switched to the neutral gear, the second light source is controlled to emit light; when the shifter is switched to the reverse gear, the third light source is controlled to emit light.

[0020] The present application provides a display component and a shifter. In the display component of the present application, a plurality of light guides correspond one to one with a plurality of light sources, and each of the light guides is provided with a light entrance portion facing the light source. The pattern provided on the light guide can be displayed under the irradiation of light. According to the difference in the patterns engraved on the plurality of light guides, and the plurality of light sources being turned on in different preset combinations or individually, the display component can be controlled to display a preset pattern or effect. Furthermore, a light entrance portion is staggered with the other light entrance portions, and the light entrance portion of a light guide is not in a straight line with the light entrance portions on other light guides, and there is a large distance difference. The light entrance portion is the portion with the highest light intensity on the light guide, so the light guide having a staggered light entrance portion can reduce the influence of the light intensity of the light entrance portions on other light guides. Therefore, the present application can also reduce the interference of the light guide having a staggered light entrance portion, and the light guide is less affected by the light on other light guides, so that the display effect of the light guide is clearer. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is an exploded view of a display assembly shown in an exemplary embodiment of the present application;

[0022] Figure 2 is an exploded view of a light guide plate and a fixing bracket shown in an exemplary embodiment of the present application;

[0023] Figure 3 is a schematic diagram of a circuit board shown in an exemplary embodiment of the present application;

[0024] Figure 4 is a schematic diagram of a partial assembly of a display component shown in an exemplary embodiment of the present application;

[0025] Figure 5 1 is a front view of a plurality of light guide plates shown in an exemplary embodiment of the present application;

[0026] Figure 6 is a cross-sectional view of a display assembly shown in an exemplary embodiment of the present application;

[0027] Figure 7 is a schematic diagram of a second fixing bracket shown in an exemplary embodiment of the present application;

[0028] Figure 8 yes Figure 7 K-direction schematic diagram;

[0029] Figure 9 1 is a schematic diagram of the assembly of a mounting base and a protective cover shown in an exemplary embodiment of the present application;

[0030] Figure 10 FIG. 1 is a top view of a display assembly according to an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0031] Here, the technical solutions in the embodiments (or "implementations") of the present application will be clearly and completely described in conjunction with the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0032] If there are terms related to directional indications or positional relationships in the embodiments of this application (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationship, movement, etc. between the components in a specific posture (as shown in the accompanying drawings); if the specific posture changes, the directional indication or positional relationship will also change accordingly. In addition, the terms "first" and "second" in the embodiments of this application are only used for the purpose of convenience of description and should not be understood as indicating or implying relative importance.

[0033] Currently, the commonly used display module in cars is the display screen, but this display screen approach is expensive, requires software integration, has reduced reliability, and cannot meet low-temperature performance requirements.

[0034] Based on this, the present application provides a display component, combined with Figure 1 、 Figure 2 and Figure 3 The display component includes a plurality of light sources 100, such as LEDs, which can be controlled to turn on according to preset conditions. The display component also includes a light guide 200, which includes a plurality of light guide plates arranged in layers, and the plurality of light guide plates are stacked together, and each light guide plate is stacked together with a gap between them. Each light guide plate is provided with a pattern, which can be laser engraved inside the light guide plate, or drawn in raised or recessed shapes on the surface. The plurality of light guide plates correspond one-to-one to the plurality of light sources 100, and each of the light guide plates is provided with a light entrance portion 300 facing the light source. That is, the light emitted by a light source is first directly irradiated on the light entrance portion 300, and then the light is guided into the corresponding light guide plate through the light entrance portion 300, so that the pattern provided on the light guide plate can be displayed under the irradiation of light. Specifically, the engraved pattern reflects or refracts the light so as to be displayed.

[0035] Control multiple light sources 100 to turn on in different combinations or individually, and then control the display of patterns on light guides in different combinations and switch them. When viewed from one side of the multiple light guides, you can see the effect of overlapping and displaying the patterns on the multiple light guides, such as a lighting or enhanced effect. Depending on the different patterns engraved on the multiple light guides, and the multiple light sources 100 turning on in different preset combinations or individually, the display component can be controlled to display a preset pattern or effect. Compared to display screens, this method of displaying patterns using multiple light guides can achieve the same display effect while optimizing costs. Since only multiple light sources 100 need to be controlled, the present application can also solve the display delay problem when the screen is at a low temperature. The display component provided by the present application can replace part of the display screen, such as the gear shift display panel, air conditioning control panel, volume control panel, etc. in the car.

[0036] Along the stacking direction x of the multiple light guide sheets, the light entrance portion 300 of at least one light guide sheet is staggered with the light entrance portions 300 of the other light guide sheets. The other light guide sheets may be arranged side by side on the same line, or may be staggered respectively. When the light entrance portions 300 of the multiple light guide sheets are all the same along the stacking direction x of the multiple light guide sheets, the multiple light entrance portions 300 are distributed along a straight line. However, in the present application, one light entrance portion 300 is staggered with the other light entrance portions 300, and the light entrance portion 300 of one light guide sheet is not on the same straight line with the light entrance portions 300 on the other light guide sheets, and there is a large distance difference. The light entrance portion 300 is the portion with the highest light intensity on the light guide sheet, so the light guide sheet with the staggered light entrance portion 300 can reduce the influence of the light intensity of the light entrance portions 300 on other light guide sheets. Therefore, the present application can further reduce the interference of the light guide sheet with the staggered light entrance portion 300, so that the light guide sheet is less affected by the light from other light guide sheets, making the display effect of the light guide sheet clearer and optimizing the cost of the display component.

[0037] In one embodiment, the light entrance portions 300 of each light guide sheet are staggered relative to one another. That is, along the stacking direction x of the multiple light guide sheets, the light entrance portions 300 of the multiple light guide sheets are not aligned, and the multiple light entrance portions 300 can be distributed on different sides of the light guide. Therefore, the light entrance portion 300 of any light guide sheet is less affected by the light intensity of the light entrance portions 300 of other light guide sheets, resulting in a clearer display effect for the patterns on each light guide sheet.

[0038] In one embodiment, combining Figure 2 and Figure 5, the light entrance parts 300 of each light guide are arranged on the same side, and the light entrance parts 300 are staggered with each other on this side. The light entrance parts 300 of multiple light guides are located on the same side, and the corresponding multiple light sources 100 can also be arranged on the same side. Compared with the light entrance parts 300 on different sides, the corresponding multiple light sources 100 also need to be arranged on different sides, so that the bracket for fixing the light source 100, the wiring harness for connecting the light source 100, etc. will be more difficult in the design process. Therefore, in this embodiment, the light entrance parts 300 of multiple light guides are located on the same side, which can facilitate the design of multiple light sources 100. Furthermore, the light entrance parts 300 are staggered with each other on this side, which reduces the mutual influence of light intensity between the light entrance parts 300, so that the display effect of the display component is better.

[0039] In one embodiment, combining Figure 2 、 Figure 4 、 Figure 7 and Figure 8 The display assembly also includes a fixed bracket 400, and a plurality of light guides are assembled on the fixed bracket 400. The fixed bracket 400 is provided with a light source hole 410 corresponding to the light entrance portion 300, and the light source 100 is provided corresponding to the light source hole. Specifically, the light source hole 410 is provided on the fixed bracket 400, and the light source 100 is irradiated into the light source hole 410. The light source hole 410 can effectively concentrate the light inside and irradiate the corresponding light guide. Therefore, the setting of the light source hole 410 in this embodiment can reduce the scattering of the light source 100, effectively concentrate the light source on the relative light guide, and achieve a better display effect.

[0040] In one embodiment, combining Figure 5 One of the light entrance parts 300 is a first light entrance part 310. The first light entrance part 310 is provided with a protrusion 311. The protrusion 311 protrudes from the edge along a direction y parallel to the light guide plate. The protrusion 311 is arranged in the light source hole 410. The protrusion 311 and the light source 100 are both arranged in the light source hole 410. The protrusion 311 can receive the light from the light source 100 more directly, and in the process of this light transmission, due to the isolation effect of the light source hole 410, this embodiment can further reduce the light from the light source 100 that overflows onto other light guide plates. The display effect of the light guide plate corresponding to the first light entrance part 310 is improved.

[0041] In one embodiment, combining Figure 6 and Figure 8The fixing bracket 400 is provided with a plurality of light source holes 410, each corresponding to a light entry portion 300. Along a direction y parallel to the light guide, each light entry portion 300 is provided with a protrusion 311 extending from the edge of the light guide. Each light source 100 and each protrusion 311 are disposed within a respective light source hole 410. Similarly, due to the isolation provided by the light source holes 410, this embodiment can further reduce the risk of light from any light source 100 spilling onto other light guides, thereby improving the display quality of each light guide and, consequently, the overall display quality of the display assembly.

[0042] Because the light entrance areas 300 are staggered on the same side, the protrusions 311 are also staggered, and the light source holes 410 are also staggered on the fixing bracket 400. The light guide 200 can include four stacked light guide plates 210, 220, 230, and 240. The corresponding light sources 100, protrusions 311, and light source holes 410 are also four. The maximum number of light guide plates is five. Excessive light guide plates can lead to problems such as ghosting and unclear display.

[0043] In one embodiment, reference Figure 3 and Figure 4 , multiple light sources 100 are arranged on the same side of the fixing bracket 400, and the display assembly also includes a circuit board 500 provided with multiple light sources 100. The circuit board 500 is fixed to the outside of the fixing bracket 400, and the multiple light sources 100 are opposite to the protrusions 311 through the respective light source holes 410. The circuit board 500 is used to integrate and fix the multiple light sources 100. The multiple light sources 100 are also staggered on the circuit board 500, corresponding to the multiple light source holes 410 and the multiple protrusions 311. Specifically, the fixing bracket 400 is provided with a mounting position corresponding to the circuit board 500, and the circuit board 500 is snapped onto the fixing bracket 400, and the light source 100 is assembled in the light source hole 410.

[0044] In one embodiment, reference Figure 2 , along the stacking direction x of the multiple light guides, the display component also includes a capacitive film (not shown in the drawings) stacked on the outside of the light guide 200. Taking the light guide 200 as an example, which includes four light guides, the capacitive film can be arranged on the upper side of the first light guide 210, or on the lower side of the fourth light guide 240. The capacitive film is electrically connected to the circuit board 500. When the user needs the display component to display a specified pattern or effect, the user touches the specified position of the capacitive film, and the pressed position will generate a corresponding electrical signal. The circuit board 500 transmits the electrical signal to the control module, and the control module controls the light source 100 to light up according to the preset combination according to the signal, thereby lighting up part of the light guide and displaying the pattern or effect specified by the user. And then realize the function of using a touch screen.

[0045] In one embodiment, reference Figure 2 、 Figure 6 and Figure 7 The fixed bracket 400 is provided with multiple layers of slots 400a, and multiple light guides are plugged into the slots 400a in each layer in a one-to-one manner. The multiple light guides are relatively fixed. This fixing method is convenient to install or disassemble, and can be disassembled and repaired without damaging the light guides. The fixed bracket 400 is located on the peripheral side of the multiple light guides. The fixed bracket 400 includes a first fixed bracket 401 and a second fixed bracket 402 that are split. The first fixed bracket 401 and the second fixed bracket 402 are assembled together by being snapped together. In the process of assembling the display component, the split fixed bracket 400 will be more convenient in the process of assembling with the multiple light guides. Then, the circuit board 500 is assembled on the fixed bracket 400, and it is ensured that the protrusions 311 on the light guide, the light source holes 410 on the fixed bracket 400, and the light source 100 on the circuit board 500 correspond to each other.

[0046] The first fixing bracket 401 and the second fixing bracket 402 are respectively provided with a first slot and a second slot facing the inner surface of the light guide plate. The first slot and the second slot together form a slot 400a consistent with the outline of the light guide plate to fix the position of the light guide plate.

[0047] In one embodiment, combining Figure 9 The display assembly further includes a mounting base 600 and a protective cover 700, which are respectively arranged on the two side surfaces of the light guide 200 along the stacking direction x of the multiple light guide plates. Taking the light guide 200 including four light guide plates as an example, the protective cover 700 is arranged on the upper side of the first light guide plate 210, and the mounting base 600 is arranged on the lower side of the fourth light guide plate 240. The mounting base 600 and the protective cover 700 are both fixedly connected to the fixed bracket 400. The fixed bracket 400 is arranged on the peripheral side of the light guide 200, and the mounting base 600 and the protective cover 700 are respectively arranged on the lower side and the upper side of the light guide 200, together forming a shell for protecting the light guide 200. The fixed bracket 400, the mounting base 600 and the protective cover 700 can be fixed by bonding or other means. The light guide 200 is first installed on the fixed bracket 400 (multiple light guide plates are inserted into the slots 400a on the fixed bracket 400), and then the assembled light guide 200 and the fixed bracket 400 are placed on the mounting seat 600. Finally, the protective cover 700 is covered on the upper side of the light guide 200. The protective cover 700 is made of a light-transmitting material, which can not only display the pattern displayed by the display component, but also prevent dust or foreign objects from damaging the light guide 200.

[0048] Combine Figure 1 and Figure 9The mounting base 600 is provided with four screw mounting bases 610 protruding toward the protective cover 700, and the four screw mounting bases 610 are distributed at the four corners of the mounting base 600. The protective cover 700 is provided with four corresponding screw mounting positions 710, and the screw mounting bases 610 and the screw mounting positions 710 are fixed together by four screws 800.

[0049] Combine Figure 1 The circuit board 500 is connected to a wiring harness for electrical connection with the control module. The mounting base 600 is provided with an insertion port 620, through which the wiring harness passes and is fixed to the mounting base 600.

[0050] Combine Figure 4 、 Figure 6-Figure 8 The light source hole 410 is formed on the second fixing bracket 402. The second fixing bracket 402 includes a positioning portion 4021 that cooperates with the mounting base 600 to position the second fixing bracket 402 relative to the mounting base 600. The clamping portion 4022 is stepped from the inside to the outside and cooperates with the first fixing bracket 401 to achieve a clamping fixation between the first fixing bracket 401 and the second fixing bracket 402.

[0051] In one embodiment, the fixing bracket 400 and the mounting base 600 can be composed of engineering plastic PC plus ABS or sound-absorbing ABS. The circuit board 500 includes a driver chip, a resistor, a diode lamp electronic device, etc. The light guide is made of PMMA (polymethyl methacrylate) material with a thickness of 0.3-1mm and excellent light-guiding performance. The pattern on the light guide will only be displayed when the light source 100 is on. In the absence of light, the engraved content on the light guide cannot be displayed. ABS is a terpolymer of three monomers: acrylonitrile (A), butadiene (B), and styrene (S).

[0052] The present application also provides a shifter for vehicle shifting, and the shifter includes the above-mentioned display assembly. Figure 4 、 Figure 5 、 Figure 9 and Figure 10 The multiple light guide plates include at least a first light guide plate 210, a second light guide plate 220 and a third light guide plate 230, and the multiple light sources include at least a first light source 110 corresponding to the first light guide plate 210, a second light source 120 corresponding to the second light guide plate 220, and a third light source 130 corresponding to the third light guide plate 230. The first light guide plate 210 is engraved with a forward gear mark, the second light guide plate 220 is engraved with a neutral gear mark, and the third light guide plate 230 is engraved with a reverse gear mark.

[0053] When the shifter is switched to forward gear, the first light source 110 is controlled to emit light, thereby illuminating the forward gear indicator on the first light guide plate 210, so that the user knows that the current gear is in forward gear. When the shifter is switched to neutral gear, the second light source 120 is controlled to emit light, thereby illuminating the neutral gear indicator on the second light guide plate 220, so that the user knows that the current gear is in neutral gear. When the shifter is switched to reverse gear, the third light source 130 is controlled to emit light, thereby illuminating the reverse gear indicator on the third light guide plate 230, so that the user knows that the current gear is in reverse gear.

[0054] Specifically, the light guide 200 may also include a fourth light guide 240, and the fourth light guide 240 includes the letters R, N, and D, which are of the same size and smaller. The first light guide 210 includes at least a larger letter R, the second light guide 220 includes at least a larger letter N, and the third light guide 230 includes at least a larger letter D. The fourth light guide 240 is always in a lit state, displaying the positions of the three letters R, N, and D. When switching gears, the light source corresponding to the light guide is switched. Taking switching to the forward gear as an example, the first light source 110 is controlled to light up the first light guide 210, so that the display component displays a larger letter R, prompting the user that the forward gear is currently in progress. The same applies to neutral and reverse gears.

[0055] It should be noted that the technical solutions or technical features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the accompanying drawings; all modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this application shall be included in the scope of protection of this application.

Claims

1. A display component, characterized in that: include Multiple light sources; The light guide comprises a plurality of light guide plates arranged in layers, and the plurality of light guide plates are stacked together, each of the light guide plates is provided with a pattern, the plurality of light guide plates correspond one-to-one to the plurality of light sources, and each of the light guide plates is provided with a light entrance portion facing the light source, and along the stacking direction of the plurality of light guide plates, the light entrance portion of at least one light guide plate is staggered with the light entrance portions of other light guide plates.

2. The display assembly according to claim 1, wherein The light incident portions of the light guide plates are staggered with each other.

3. The display assembly according to claim 2, wherein The light incident portions of the light guide plates are arranged on the same side, and the light incident portions are staggered with each other on the side.

4. The display assembly according to any one of claims 1 to 3, wherein: The display assembly further includes a fixing bracket, the plurality of light guide plates are assembled on the fixing bracket, the fixing bracket is provided with a light source hole corresponding to the light incident portion, and the light source is arranged corresponding to the light source hole.

5. The display assembly according to claim 4, wherein: One of the light entrance portions is a first light entrance portion. The first light entrance portion is provided with a protrusion. The protrusion protrudes from an edge along a direction parallel to the light guide plate. The protrusion is provided in the light source hole.

6. The display assembly according to claim 4, wherein: The fixed bracket is provided with a plurality of light source holes, each of the light source holes corresponds one-to-one to each of the light entrance portions. Along a direction parallel to the light guide plate, each light entrance portion is provided with a protrusion protruding from the edge of the light guide plate, and each of the light sources and each of the protrusions is arranged in each of the light source holes.

7. The display assembly according to claim 6, wherein: The multiple light source holes are arranged on the same side of the fixing bracket. The display component also includes a circuit board provided with multiple light sources. The circuit board is fixed to the outside of the fixing bracket. The multiple light sources are opposite to the protrusions through the light source holes.

8. The display assembly according to claim 7, wherein: Along the stacking direction of the plurality of light guide sheets, the display assembly further includes a capacitor film stacked on the outside of the light guide member, and the capacitor film is electrically connected to the circuit board.

9. The display assembly according to claim 4, wherein: The fixing bracket is provided with multiple layers of slots, and the multiple light guide plates are plugged into the slots of each layer in a one-to-one correspondence.

10. The display assembly according to claim 8, wherein The display assembly further comprises a mounting seat and a protective cover, which are respectively arranged on two side surfaces of the light guide member along the stacking direction of the plurality of light guide sheets. The mounting seat and the protective cover are both fixedly connected to the fixing bracket.

11. A gear shifter, characterized in that: include: The display assembly according to any one of claims 1 to 10; The plurality of light guide sheets at least include a first light guide sheet, a second light guide sheet, and a third light guide sheet; the plurality of light sources at least include a first light source corresponding to the first light guide sheet, a second light source corresponding to the second light guide sheet, and a third light source corresponding to the third light guide sheet; the first light guide sheet is engraved with a forward gear mark, the second light guide sheet is engraved with a neutral gear mark, and the third light guide sheet is engraved with a reverse gear mark; When the shifter is switched to the forward gear, the first light source is controlled to emit light; when the shifter is switched to the neutral gear, the second light source is controlled to emit light; when the shifter is switched to the reverse gear, the third light source is controlled to emit light.

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