CN116559994A - Backlight module and electric energy meter - Google Patents
Backlight module and electric energy meter Download PDFInfo
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- CN116559994A CN116559994A CN202310627692.1A CN202310627692A CN116559994A CN 116559994 A CN116559994 A CN 116559994A CN 202310627692 A CN202310627692 A CN 202310627692A CN 116559994 A CN116559994 A CN 116559994A
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/002—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
- G02B6/0043—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided on the surface of the light guide
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
- G02B6/0073—Light emitting diode [LED]
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
- G02B6/0086—Positioning aspects
- G02B6/0088—Positioning aspects of the light guide or other optical sheets in the package
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
- G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133608—Direct backlight including particular frames or supporting means
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Planar Illumination Modules (AREA)
Abstract
The invention discloses a backlight module and an electric energy meter, and relates to the technical field of display. In the backlight module, the contact surface of the second flat plate of the light guide plate and the LED covers the LED, so that after the LED emits light beams, the light enters the second flat plate of the light guide plate, then enters the first flat plate of the light guide plate through a corner, and finally the first flat plate refracts the light to the front surface of the LCD, namely the invention can realize that the light is refracted to the front surface of the LCD by only relying on the light guide plate which is provided with the corner and can cover the LED with the contact surface of the LED, thereby achieving better backlight display effect; secondly, the combination of a plurality of different materials is not needed, the production cost is greatly reduced, the situation that the materials are not compact along with the time is avoided, and the backlight display effect is not affected; and the LEDs are directly welded on the circuit board, so that the stability and reliability of the backlight module are improved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a backlight module and an electric energy meter.
Background
The electric energy meter display module generally comprises a liquid crystal display (Liquid Crystal Display, LCD) and a backlight plate arranged below the liquid crystal display, wherein the backlight plate is started by a backlight lamp to backlight the liquid crystal display, so that a user can conveniently view the content on the liquid crystal display.
Current power meter backlight assemblies include backlight holders, light guide plates, light shields, light guides, light emitting diodes (Light Emitting Diode, LEDs). The display screen and the light guide plate are embedded in the groove of the backlight bracket up and down, the LED is inserted in the notch at one side edge of the light guide plate and then is installed on the backlight bracket together with the light guide plate, and two leads of the LED extend downwards from the opening at the edge to the circuit board for electric connection. The upper and lower parts of the light guide plate are respectively provided with a white light guide plate, and the lower part of the front light guide plate is provided with a black light shielding plate. Since the LED is located at the edge of one side of the light guide plate, it is necessary to ensure that light is emitted from the front of the LCD as much as possible by using a combination of the light guide plate, the light shielding sheet, and the light guiding sheet, so as to achieve a good backlight display effect. However, since a plurality of different materials are combined, the production process is more, the structure is more complicated, the production cost is increased, and the adhesion between different materials is not tight with the lapse of time, so that the backlight display effect is reduced.
Therefore, the technical problem to be solved by the person skilled in the art is to provide a backlight module with a simple structure to achieve a good backlight display effect.
Disclosure of Invention
The invention aims to provide a backlight module and an electric energy meter, which are used for achieving a good backlight display effect.
In order to solve the above technical problems, the present invention provides a backlight module, including: the LED is welded on the circuit board; one side of the corner is a first flat plate of the light guide plate, and the other side of the corner is a second flat plate of the light guide plate;
the first flat panel is positioned between the LCD and the circuit board and is parallel to the LCD;
the second flat plate is in contact with the LED, and the contact surface covers the surface of the LED.
Preferably, the corner is an arc chamfer.
Preferably, the size of the contact surface is larger than the size of the surface of the LED.
Preferably, the second flat plate is in a trapezoid structure, a first bottom surface of the trapezoid structure is the contact surface, and the size of the first bottom surface is larger than that of the surface of the LED; the second bottom surface of the trapezoid structure has the same shape and the same size as the first flat plate in a cross section along a direction perpendicular to the LCD.
Preferably, the lower surface of the first plate is provided with mesh points; wherein the lower surface of the first plate is a surface far from the LCD among two surfaces of the first plate parallel to the LCD.
Preferably, the size of each mesh point arranged on the lower surface of the first plate is equal, and the distances between the centers of two adjacent mesh points are equal.
Preferably, the lower surface of the first plate is divided into a plurality of dots of different areas, and the distances between the centers of two adjacent dots of different areas are not equal.
Preferably, the method further comprises: the reflective film is arranged on the lower surface of the first flat plate and the periphery of the first flat plate, wherein the periphery of the first flat plate is four surfaces, perpendicular to the LCD, of the first flat plate.
Preferably, the light guide plate and the backlight bracket are of an integral injection molding structure.
Preferably, the material of the light guide plate is plexiglass.
In order to solve the technical problem, the invention also provides an electric energy meter, which comprises the backlight module.
The backlight module provided by the invention comprises: the LED is welded on the circuit board; one side of the corner is a first flat plate of the light guide plate, and the other side of the corner is a second flat plate of the light guide plate; the first flat plate is positioned between the LCD and the circuit board and is parallel to the LCD; the second flat plate is in contact with the LED, and the contact surface covers the surface of the LED. The backlight module provided by the invention has the beneficial effects that firstly, compared with the mode that the LEDs are positioned in the slots at one side edge of the light guide plate and light rays are emitted from the front surface of the LCD as far as possible in a mode of combining the light guide plate, the light shielding sheet and the light guide sheet, in the backlight module provided by the invention, the contact surface of the second flat plate of the light guide plate and the LEDs covers the LEDs, so that after the LEDs emit light beams, the light rays enter the second flat plate of the light guide plate and then enter the first flat plate of the light guide plate through corners, and finally, the first flat plate refracts the light rays to the front surface of the LCD, namely, the invention only needs to rely on the light guide plate with corners and the contact surface with the LEDs can cover the LEDs, so that the light rays are refracted to the front surface of the LCD, and a better backlight display effect is achieved; secondly, the invention does not need the combination of a plurality of different materials, so that the production cost is greatly reduced, the condition that the plurality of materials are not compact along with the time is avoided, and the backlight display effect is not influenced; in comparison with the prior backlight module, the LED is inserted into the slot at one side edge of the light guide plate and then is mounted on the backlight bracket together with the light guide plate, and the two wires of the LED lamp extend downwards from the opening at the edge to the circuit board for electric connection, so that the LED is directly welded on the circuit board and is not connected with the circuit board through the wires, the LED is not easy to loosen, and the situation that the wires are broken and the LED cannot be electrified when the electric energy meter is vibrated under the action of external force does not exist, so that the stability and the reliability of the backlight module are improved; in addition, because the circuit board is usually provided with antistatic measures, the LED is welded on the circuit board to avoid the influence of static electricity as much as possible, thereby further improving the stability and reliability of the backlight module.
In addition, the invention also provides an electric energy meter which has the same or corresponding technical characteristics as the backlight module, and the effects are the same as those of the backlight module.
Drawings
For a clearer description of embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described, it being apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.
Fig. 1 is a schematic diagram of a backlight module according to an embodiment of the invention;
FIG. 2 is a schematic view of a light guide plate with arc chamfer angle according to an embodiment of the present invention;
fig. 3 is a schematic view of a light guide plate with a corner as an edge according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a position of measuring luminous flux after a light guide plate is turned according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of dot distribution with equal size and equal spacing according to an embodiment of the present invention;
fig. 6 is a schematic diagram of three-segment dot distribution according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without making any inventive effort are within the scope of the present invention.
The invention provides a backlight module and an electric energy meter, which are used for achieving a good backlight display effect.
The electric energy meter display module generally comprises an LCD and a backlight plate arranged below the LCD, and the backlight plate is started by the backlight lamp to backlight the LCD, so that a user can conveniently view the content on the LCD. In the prior backlight module, an LED light-emitting component is arranged in a notch at the edge of one side of a light guide plate, a reflecting film is stuck on the back surface of the light guide plate, and edge strips are stuck on the peripheral side surfaces of the light guide plate to reflect light. After the LED luminous component is electrified to emit light, light is reflected by the reflecting film and the side edge strips and is transmitted to the front surface of the light guide plate, so that the front surface of the light guide plate emits light, and backlight display is provided for a liquid crystal screen of the electric energy meter. That is, in the prior backlight module, the light emission from the front surface of the LCD needs to be ensured as much as possible by the combination of the light guide plate, the light shielding sheet and the light guide sheet. However, the use of a plurality of different material combinations results in more production steps, a more complex structure, increased production cost, and less adhesion between different materials over time, which also affects the display effect. In addition, in the LED light-emitting component, an LED light source is generally directly embedded into a slot at the edge of the light guide plate, and is welded to the circuit board by leading out two wires, so that the LED is easy to loosen for a long time, and the poor contact between the LED and a lead in the light guide plate is caused, so that the normal work of the LED is influenced; secondly, the lead wire connected between the LED and the circuit board is longer, and the lead wire is easy to break when the electric energy meter vibrates under the action of external force, so that the LED cannot be electrified.
Therefore, the invention provides the backlight module, wherein the LED light source is directly welded on the circuit board in the backlight module, and one side of the LED light source is bent by a rounding angle and then faces the light guide plate of the circuit board, so that light rays are emitted from the front of the LCD, and a good backlight display effect is achieved. It should be noted that the backlight module provided by the invention can be applied to any display device, such as a display module of an electric energy meter.
In order to better understand the aspects of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. Fig. 1 is a schematic diagram of a backlight module according to an embodiment of the invention, as shown in fig. 1, the backlight display module includes: a light guide plate 1 with a corner and an LED3 welded on a circuit board 2; wherein, one side of the corner is a first flat plate 10 of the light guide plate 1, and the other side of the corner is a second flat plate 11 of the light guide plate 1;
the first flat plate 10 is located between the LCD4 and the circuit board 2 and parallel to the LCD 4;
the second plate 11 is in contact with the LED3, and the contact surface covers the surface of the LED 3.
The circles in fig. 1 represent the corners. In the backlight module, the LED is turned on to backlight the LCD. In this embodiment, the LEDs are directly soldered on the circuit board, the second plate of the light guide plate contacts the LEDs, and the contact surface covers the surface of the LEDs. When the LEDs are turned on, light beams emitted by the LEDs firstly enter a second flat plate of the light guide plate, enter a first flat plate of the light guide plate after passing through corners, and then the light beams in the first flat plate are refracted to the front face of the LCD, so that the light rays are emitted from the front face of the LCD as much as possible.
The material of the light guide plate, the shape of the first plate, the second plate, the corner, etc. of the light guide plate are not limited, and are determined according to practical situations. The light guide plate is made of polycarbonate, and the light transmittance of the organic glass is 92%, the light transmittance of the polycarbonate is 87%, and the refractive indexes of the organic glass and the polycarbonate are similar, but the organic glass is easier to process and cheaper than the polycarbonate, so that in practice, the light guide plate is preferably made of organic glass.
Since the light is finally refracted to the front side of the LCD through the first panel, the shape and size of the first panel selected in the embodiment are the same as those of the LCD in order to ensure the front brightness uniformity of the LCD as much as possible. In addition, since the second plate is in contact with the LEDs, the light beams emitted by the LEDs are introduced into the light guide plate, and thus, in order to ensure as much light beams as possible into the second plate, in practice, the size of the contact surface of the second plate with the LEDs is larger than the size of the surface of the LEDs.
The first plate and the second plate of the light guide plate are connected through a corner, the shape of the corner is not limited, and the corner can be a corner or an arc. Fig. 2 is a schematic view of a light guide plate with arc chamfer angle, and fig. 3 is a schematic view of a light guide plate with arc chamfer angle. Under the same conditions (such as the material of the light guide plate, the emission half angle of the light source, the size of the light source, etc.), the proper corner shape is determined by testing the light guide plate with arc chamfer of fig. 2, the ratio of the luminous flux 20mm away from the LED on the second plate in the light guide plate with chamfer of fig. 3, and the ratio of the luminous flux 3mm away from the LED on the first plate after the corner. Tests show that for the light guide plate with arc chamfer and the light guide plate with chamfer, the ratio of the luminous flux of the second flat plate, which is 20mm away from the LEDs, to the luminous flux emitted by the LEDs can reach 96.52%, namely 96.52% of the light emitted by the LEDs passes through the second flat plate, which is 20mm away from the LEDs; for the light guide plate with the corner, the ratio of the luminous flux at the width of 3mm after the corner on the first flat plate to the luminous flux emitted by the LED was reduced from 96.52% to 47.14%, while for the light guide plate with the arc chamfer, the ratio of the luminous flux at the width of 3mm after the corner on the first flat plate to the luminous flux emitted by the LED was reduced from 96.52% to 62.21%, and therefore, under the same test conditions, the light guide effect of the light guide plate with the arc chamfer was far greater than that of the light guide plate with the corner. Thus, in practice, the corners are preferably arc-shaped chamfers.
The shape of the corner affects the light guiding efficiency of the light guiding plate, and in practice, the emission half angle of the LED affects the light guiding efficiency of the light guiding plate. The emission half angle of the LED is not limited and is determined according to practical situations. Taking an arc chamfer as an example, when the emission half angle of the LED is increased from 20 degrees to 30 degrees and 35 degrees respectively, the ratio of the luminous flux at the position 20mm away from the LED on the second flat plate to the luminous flux emitted by the LED is measured, and when the emission half angle of the LED is 30 degrees, the luminous flux ratio is reduced from 96.52 percent before the corner to 60.29 percent; at an emission half angle of 35 deg. of the LED, the luminous flux ratio is reduced from 96.52% before the corner to 59.57%. It can be seen that the emission half angles of the LEDs are different, and the light guiding efficiency of the light guiding plate is different.
In practice, the efficiency of the light guide plate in refracting light is also related to the magnitude of the curved radius of the corner. The receiving plate is arranged in the section of the light guide plate after the corner of the light guide plate for measuring the luminous flux. Fig. 4 is a schematic diagram of a position of measuring light flux after a light guide plate turns, and circles in fig. 4 indicate the position of measuring light flux according to an embodiment of the present invention. The LED emission half angle was set to 20 °, and at the test positions shown by circles in fig. 4, the corresponding luminous flux ratios were 96.06%, 96.16%, 95.47%, 96.20%, 96.22%, 96.18% for radii of curvature of 8mm, 9mm, 10.5mm, 11mm, 11.5mm, 12mm, respectively. The light transmission efficiency under the structures with different curvature radiuses is close, and the light transmission efficiency is highest when the radius is 11.5 mm.
The backlight module provided in this embodiment includes: the LED is welded on the circuit board; one side of the corner is a first flat plate of the light guide plate, and the other side of the corner is a second flat plate of the light guide plate; the first flat plate is positioned between the LCD and the circuit board and is parallel to the LCD; the second flat plate is in contact with the LED, and the contact surface covers the surface of the LED. Firstly, compared with the mode that the LEDs are positioned in the slots at one side edge of the light guide plate before, the light rays are emitted from the front face of the LCD as far as possible through the mode of combining the light guide plate, the light shielding sheet and the light guide sheet, in the backlight module provided by the embodiment of the invention, the contact surface of the second flat plate of the light guide plate and the LEDs covers the LEDs, so that after the LEDs emit light beams, the light rays enter the second flat plate of the light guide plate and then enter the first flat plate of the light guide plate through corners, and finally the first flat plate refracts the light rays to the front face of the LCD, namely, the light rays can be refracted to the front face of the LCD only by relying on the light guide plate with corners and the contact surface of the LED can cover the LEDs, and better backlight display effect is achieved; secondly, the embodiment of the invention does not need the combination of a plurality of different materials, so that the production cost is greatly reduced, the condition that the plurality of materials are not compact along with the time is avoided, and the backlight display effect is not influenced; in comparison with the prior backlight module, the LED is inserted into the slot at one side edge of the light guide plate and then is mounted on the backlight bracket together with the light guide plate, and the two wires of the LED lamp extend downwards from the opening at the edge to the circuit board for electric connection, so that the LED is directly welded on the circuit board and is not connected with the circuit board through the wires, the LED is not easy to loosen, and the situation that the wires are broken and the LED cannot be electrified when the electric energy meter is vibrated under the action of external force does not exist, so that the stability and the reliability of the backlight module are improved; in addition, because the circuit board is usually provided with antistatic measures, the LED is welded on the circuit board to avoid the influence of static electricity as much as possible, thereby further improving the stability and reliability of the backlight module.
In the above embodiment, the shape of the second flat plate is not limited, but in practice, in order to improve the brightness of the LCD, the second flat plate is preferably in a trapezoid structure, a first bottom surface of the trapezoid structure is a contact surface, and a size of the first bottom surface is larger than a size of a surface of the LED; the second bottom surface of the trapezoid structure has the same shape and the same size as the first flat board in a cross section along a direction perpendicular to the LCD.
The light guide plate provided in this embodiment is as shown in fig. 2 and 3, and the second plate has a trapezoid structure. If the structure of the second flat plate is a cuboid structure, when the light beam emitted by the LED enters the second flat plate, compared with the second flat plate with a trapezoid structure, the area of the second flat plate with the cuboid structure is larger, so that the loss of the light beam in the second flat plate is more, and the light beam reaching the first flat plate is less, thereby reducing the brightness of the LCD.
The second light guide plate with the trapezoid structure provided by the embodiment enables more light beams to enter the first flat plate, so that the brightness of the LCD is improved.
In order to improve the emergent efficiency of the light beam on the first flat plate of the light guide plate, the lower surface of the first flat plate is provided with lattice points in a preferred embodiment; wherein the lower surface of the first plate is the surface far away from the LCD of the two surfaces parallel to the LCD of the first plate.
The material of the lattice point is the same as that of the light guide plate. The size of the dots, the distance between the dots, and the like are not limited, and are determined according to actual conditions.
The bottom of the first flat plate of the light guide plate is provided with the lattice points, so that more light beams can be refracted to the front surface of the LCD, and the brightness of the LCD is improved.
In practice, in order to ensure a higher emission rate, the preferred embodiment is that the size of each dot provided on the lower surface of the first plate is equal, and the distances between the centers of two adjacent dots are equal.
Fig. 5 is a schematic diagram of dot distribution with equal size and equal spacing according to an embodiment of the present invention. When the dot diameters are 0.4mm and the dot pitches are 0.5mm, 0.6mm, 0.7mm, 0.8mm and 1mm, the emission efficiency of the upper surface (the surface close to the LCD) of the first flat plate is measured, and found that the emission efficiency is 32.02%, 27.88%, 24.04%, 22.40% and 17.85% respectively, and when the size and the equal pitch of the backlight dots are equal, the emission efficiency is reduced along with the increase of the dot center pitch. In addition, uniformity declines when backlight dots are equally sized, dot centers are equally spaced.
The equal-size and equal-spacing dot distribution provided by the embodiment can ensure higher emergence rate.
The equal size and equal pitch dot distribution can ensure higher emission rate, but uniformity is reduced, so in implementation, in order to improve the light uniformity of the LCD, the lower surface of the first panel is preferably divided into dots of multiple areas, and the distances between the centers of two adjacent dots of different areas are not equal.
In this embodiment, dots dividing the lower surface of the first plate into a plurality of areas are referred to as segmented backlight dots. When the lower surface of the first plate is divided into three areas, it is called a three-segment dot. The size of the mesh point in each area and the distance between the centers of two adjacent mesh points are equal, and the distances between the centers of two adjacent mesh points in different areas are unequal. The number of the areas divided from the lower surface of the first plate is not limited, and is determined according to practical situations. Fig. 6 is a schematic diagram of three-segment dot distribution according to an embodiment of the present invention.
The circles in fig. 5 and 6 represent dots 5. When the dot diameter is 0.4mm, the three-section spacing (the spacing between the centers of adjacent dots in each region) is 0.5mm, 0.7mm, 0.9mm, the exit efficiency of the upper surface of the first flat plate is 26.30%; when the dot diameter is 0.6mm, the three-section spacing is 0.7mm, 0.8mm and 1mm, the upper surface emergence rate of the first flat plate is 29.87%; when the dot diameter is 0.8mm, the three-section spacing is 0.9mm, 1.1mm and 1.6mm, the upper surface emergence rate of the first flat plate is 29.54%; when the dot diameter is 1mm, the three-section spacing is 1.2mm, 1.5mm and 2mm, the emergent rate of the upper surface of the first flat plate is 28.88%. The test result shows that the lattice point has three-section structure and equal interval, and the light uniformity of the upper surface can reach excellent effect while ensuring the luminous flux.
In order to make the emergent light more uniform on the upper surface of the first plate, in implementation, the backlight module further includes: the lower surface of the first flat plate and the periphery of the first flat plate are provided with reflecting films, wherein the periphery of the first flat plate is provided with four surfaces which are perpendicular to the LCD in the first flat plate.
When the reflective film is added only to the lower surface of the first flat plate and the reflective film is added to the lower surface and the periphery of the first flat plate, the emergent efficiency of the upper surface of the first flat plate is tested, and the reflective film is added only to the bottom (namely the lower surface), the light emergent rate is 46.64%, the reflective film is added to the bottom and the periphery, the light emergent rate reaches 64.55%, and the emergent light is more uniform on the upper surface.
The reflective films are arranged on the lower surface of the first flat plate and on the periphery of the first flat plate, so that the emitted light rays are more uniform on the upper surface of the first flat plate.
In order to improve the stability of the backlight module, the light guide plate and the backlight bracket are preferably integrally injection-molded.
The light guide plate and the backlight bracket provided by the embodiment adopt an integral injection molding mode, and have the advantages of simple processing and manufacturing, short production period and the like, thereby reducing the production cost; in the production process of the injection molding product, the quality and the structural stability of the light guide plate and the bracket are improved because of no internal stress; the integrated injection molding can also realize the personalized design of the light guide plate and the bracket. When the backlight module is applied to the electric energy meter, the adaptability of the backlight module to the electric energy meter can be improved, and the backlight module is reliably fixed on the electric energy meter.
The above describes a backlight module, and the present embodiment further provides an electric energy meter, including the above backlight module. The embodiments of the backlight module have been described in detail above, and the embodiments of the electric energy meter are not described herein again.
According to the electric energy meter provided by the embodiment, the LED light source is directly welded on the circuit board, then the organic glass is manufactured into the light guide plate with a smooth surface by using an injection molding method, one side of the light guide plate is designed to face the LED welding position on the circuit board after being bent by a rounding angle so as to ensure that light rays are emitted from the front of the LCD, and the situations that looseness, poor contact and the like are easy to occur when the LED is embedded into the side surface of the light guide plate are avoided; the bottom surface of the light guide plate adopts a three-section type backlight screen dot design, and the bottom and the periphery are provided with the reflecting film, so that the light can be uniformly emitted out of the upper surface with high brightness, the structure is simple, the manufacturing process requirement is low, and the cost is saved; the light guide plate and the backlight bracket adopt an integral injection molding technology, so that the product quality and stability are improved, the processing and manufacturing are simple, and the cost is low.
The backlight module and the electric energy meter provided by the invention are described in detail. In the description, each embodiment is described in a progressive manner, and each embodiment is mainly described by the differences from other embodiments, so that the same similar parts among the embodiments are mutually referred. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
It should also be noted that in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Claims (11)
1. A backlight module, comprising: the LED is welded on the circuit board; one side of the corner is a first flat plate of the light guide plate, and the other side of the corner is a second flat plate of the light guide plate;
the first flat panel is positioned between the LCD and the circuit board and is parallel to the LCD;
the second flat plate is in contact with the LED, and the contact surface covers the surface of the LED.
2. A backlight module according to claim 1, wherein the corners are arc-shaped chamfers.
3. A backlight module according to claim 1, wherein the size of the contact surface is larger than the size of the surface of the LED.
4. The backlight module according to claim 1, wherein the second flat plate has a trapezoid structure, a first bottom surface of the trapezoid structure is the contact surface, and a size of the first bottom surface is larger than a size of a surface of the LED; the second bottom surface of the trapezoid structure has the same shape and the same size as the first flat plate in a cross section along a direction perpendicular to the LCD.
5. The backlight module according to claim 1, wherein the lower surface of the first plate is provided with mesh points; wherein the lower surface of the first plate is a surface far from the LCD among two surfaces of the first plate parallel to the LCD.
6. A backlight module according to claim 5, wherein the mesh points provided on the lower surface of the first plate have the same size, and the centers of two adjacent mesh points have the same distance.
7. A backlight module according to claim 5, wherein the lower surface of the first plate is divided into a plurality of dots in a plurality of areas, and the distances between the centers of two adjacent dots in different areas are not equal.
8. A backlight module according to claim 7, further comprising: the reflective film is arranged on the lower surface of the first flat plate and the periphery of the first flat plate, wherein the periphery of the first flat plate is four surfaces, perpendicular to the LCD, of the first flat plate.
9. A backlight module according to any one of claims 1 to 8, wherein the light guide plate and the backlight holder are of an integrally injection-molded structure.
10. A backlight module according to claim 9, wherein the light guide plate is made of plexiglass.
11. An electric energy meter, characterized by comprising a backlight module according to any one of claims 1 to 10.
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| CN202310627692.1A CN116559994A (en) | 2023-05-31 | 2023-05-31 | Backlight module and electric energy meter |
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| CN202310627692.1A CN116559994A (en) | 2023-05-31 | 2023-05-31 | Backlight module and electric energy meter |
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