CN101404187B - Backlight illumination system of LCD and indicating pointer - Google Patents
Backlight illumination system of LCD and indicating pointer Download PDFInfo
- Publication number
- CN101404187B CN101404187B CN2008101809592A CN200810180959A CN101404187B CN 101404187 B CN101404187 B CN 101404187B CN 2008101809592 A CN2008101809592 A CN 2008101809592A CN 200810180959 A CN200810180959 A CN 200810180959A CN 101404187 B CN101404187 B CN 101404187B
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- Prior art keywords
- pointer
- lcd
- light guide
- guide plate
- cylinder
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- 238000005286 illumination Methods 0.000 title abstract description 9
- 238000009792 diffusion process Methods 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000003760 hair shine Effects 0.000 description 2
- 230000004446 light reflex Effects 0.000 description 1
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Abstract
The invention relates to a backlight illumination system used for an LCD and a pointer, comprising a display screen, a light guide bracket, a light guide plate, a pointer and an LED; the LED and the pointer of the system commonly use the LED which is welded on the PCB board of an instrument; furthermore, the external wall of the pointer cylinder is connected with a motor below the pointer cylinder; the upper end of the pointer cylinder is the structure of an through hole; a prism is arranged at a position of the pointer cylinder close to the pointer wall. The backlight illumination system cancels the PCB board and pointer cap of the LCD, only adopts one LED to lead the pointer and the LCD to gain excellent illumination backlight, has simple structure and low cost and leads the integral thickness of the LCD to be thinned.
Description
Technical field
The present invention relates to the instrument backlight illuminating system, be specifically related to the backlight illuminating system of a kind of LCD and pointer.
Background technology
At present the backlight and pointer of the LCD of instrument is backlight all is separate, particularly LCD be placed on pointer directly over, this structure causes very big influence for moulding and the cost of LCD, the structure of general LCD has following a few part to constitute: display screen, the leaded light support, pcb board, this LCD is from the angle of moulding, required thickness is got over Bao Yuehao, and is short more good more from the distance of table board.But illumination is separate, and the LCD illumination needs independently LED, and LED need be welded on the pcb board, if make the thickness attenuation, just needs to increase more LED-backlit illumination, increases cost; If reduce the quantity of LED, remedy with the leaded light support, the height of leaded light support needs to increase, and this will increase the thickness of LCD integral body again,
Make light more even in order to reach in addition, the product that has increases light guide plate and realizes this effect, as application number is light guide plate and the module backlight of CN200310112276.0, but there is following shortcoming in this structure, 1.LED lamp can only be from the side-irradiation of light guide plate, but can not be placed on light guide plate under; 2. need a plurality of sites, mechanism is more complicated also.
Summary of the invention
The objective of the invention is to reduce the thickness of LCD as far as possible, and can obtain good effect backlight not increasing under the condition of cost.
For achieving the above object, the invention provides the backlight illuminating system of a kind of LCD and pointer, comprise a display screen, a leaded light support, a light guide plate, a pointer, one LEDs, the shared LEDs of the LCD of system and pointer, LED is welded on the instrument pcb board, and below the pointer cylinder, the outer wall of pointer cylinder is connected with motor, the upper end of pointer cylinder is a through-hole structure, in the place of pointer cylinder near the pointer wall, establishes a prism.
The present invention cancels the pcb board of LCD and pointer cap on the basis of existing technology, only adopts a LED, and a part of light of LED upwards shines light guide plate by the cylinder of pointer, and another part light also passes through a reflection from lens to pointer arm.So only just make pointer and LCD all obtain good illumination backlight, and simple in structure, with low cost, and can reduce the integral thickness of LCD as required by a LED.
Description of drawings
Fig. 1 always schemes for the backlight illuminating system structure
Fig. 2 is the transmission route figure of light in pointer
Fig. 3 is the transmission route figure of light in light guide plate
Fig. 4 is circular light guide plate upward view
Fig. 5 is the rectangular light guide plate upward view
Description of reference numerals:
The 1-display screen; The 2-light guide plate; 3-leaded light support; The 4-pointer; The 5-prism; 6-pointer cylinder; 7-LED; The 8-motor; 9-instrument pcb board; The 10-groove.
Embodiment
The LED that is used for back illumination is welded on instrument pcb board 8, the chip for driving of LCD also is welded on the instrument pcb board simultaneously, pointer 4 and stepper motor 6 are not that the axle by stepper motor is connected, but be connected with stepper motor by the outer wall of pointer, the drum diameter of pointer becomes big like this, can comprise whole LED, help the transmission of light and the loss of minimizing light, in place near the pointer wall, if the prism 5 of one 45 degree, the height of prism extends to cylinder center, and the effect of prism is that partial L ED light is reflexed on the pointer arm, whole pointer has been cancelled the pointer cap, and the upper end of pointer is a through-hole structure.
The upper end of whole pointer extends in the light guide plate, can reduce the loss of light like this, and the leaded light support is embraced the upper end of pointer, and pyramidal structure is adopted in the place that light guide plate and pointer upper end border on, and cone bottom diameter is greater than drum diameter.
LCD with circle is an example, the dip plane of light guide plate is provided with the concentric grooves that spacing changes, this concentric grooves is that the center with light guide plate is that the center of circle is gradually to external diffusion, the concentric structure that forms, wherein the cross section of each groove is a triangle, in order to reach homogeneity backlight, the quantity of concentric grooves is no less than 20.Concentrically ringed groove is along with the distance from the light guide plate center is far away more simultaneously, and it is close more to distribute, and size is more little, and the upward view of light guide plate as shown in Figure 3.The thickness of light guide plate, linearity reduces gradually from inside to outside, the cross section triangularity, the inclination angle is 15 degree, as shown in Figure 1.
Principle of work is as follows:
1, pointer is backlight: the LED7 that is used for back lighting light shines in the cylinder of pointer 4, and guides light into the LCD direction, and part light reflexes on the pointer wall backlight by prism 5, finishes the pointer back lighting so as shown in Figure 2.
2, LCD is backlight: LED-backlit sees through light guide plate 2, with shining on the LCD of even back.
The light that transmits from pointer, incide on the light guide plate, cone mechanism is dispersed light to the side of light guide plate, light is through repeatedly reflecting or shining directly on the concentric groove, because of these grooves are concentric grooves with variable in distance, it can be assembled in the zones of different, plays the effect of prismatic lens, improve emitting brightness, finally reach even back and distribute.As shown in Figure 4.
According to the shape of LCD, if rectangle can be made concentric rectangle as shown in Figure 5 with groove.
The structure of LCD and pointer is arrived in this back light system overall thinking, thereby reaches the thickness attenuation of the attractive in appearance of moulding: LCD, and the distance of LCD and label shortens, and has reduced the quantity of LED and the pcb board of LCD simultaneously, has reduced cost.
Claims (7)
1.LCD and the backlight illuminating system of pointer, comprise a LCD (1), a leaded light support (3), a light guide plate (2), a pointer (4), one LEDs (7) is characterized in that: the shared LEDs of the LCD of this system and pointer, LED are welded on the below that the pointer cylinder was gone up and be in to instrument pcb board (8), the outer wall of pointer cylinder is connected with motor, the upper end of pointer cylinder is a through-hole structure, in the place of pointer cylinder near the pointer wall, establishes a prism (5).
2. the backlight illuminating system of LCD as claimed in claim 1 and pointer, wherein, leaded light support (3) is embraced the upper end of pointer (4).
3. the backlight illuminating system of LCD as claimed in claim 1 and pointer, light guide plate (2) and the place that pointer (4) upper end borders on adopt pyramidal structure, and cone bottom diameter is greater than drum diameter.
4. the backlight illuminating system of LCD as claimed in claim 3 and pointer, the thickness of light guide plate (2), linearity reduces gradually from inside to outside, the cross section triangularity, the inclination angle is 15 degree.
5. the backlight illuminating system of LCD as claimed in claim 4 and pointer, wherein, the concentric grooves that spacing changes is set on the dip plane of light guide plate (2), this concentric grooves be the center with light guide plate be the center of circle gradually to external diffusion, the concentric structure of formation.
6. the backlight illuminating system of LCD as claimed in claim 5 and pointer, the cross section of wherein said groove is a triangle, and the quantity of concentric grooves is no less than 20, and concentrically ringed groove is along with the distance from the light guide plate center is far away more, and it is close more to distribute, and size is more little.
7. as the backlight illuminating system of above-mentioned any described LCD of claim and pointer, wherein said prism (5) is 45 degree prisms, and the height of prism extends to cylinder center.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101809592A CN101404187B (en) | 2008-11-20 | 2008-11-20 | Backlight illumination system of LCD and indicating pointer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101809592A CN101404187B (en) | 2008-11-20 | 2008-11-20 | Backlight illumination system of LCD and indicating pointer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101404187A CN101404187A (en) | 2009-04-08 |
| CN101404187B true CN101404187B (en) | 2010-09-08 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101809592A Active CN101404187B (en) | 2008-11-20 | 2008-11-20 | Backlight illumination system of LCD and indicating pointer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101404187B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2472269B (en) * | 2009-07-31 | 2014-11-12 | Visteon Global Tech Inc | Pointer display |
| JP5836763B2 (en) * | 2011-11-08 | 2015-12-24 | 矢崎総業株式会社 | Lighting structure of liquid crystal panel in vehicle instrument |
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2008
- 2008-11-20 CN CN2008101809592A patent/CN101404187B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN101404187A (en) | 2009-04-08 |
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