CN102890365A - Direct-downward type LED (Liquid Crystal Display) liquid crystal module - Google Patents
Direct-downward type LED (Liquid Crystal Display) liquid crystal module Download PDFInfo
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- CN102890365A CN102890365A CN2012104040954A CN201210404095A CN102890365A CN 102890365 A CN102890365 A CN 102890365A CN 2012104040954 A CN2012104040954 A CN 2012104040954A CN 201210404095 A CN201210404095 A CN 201210404095A CN 102890365 A CN102890365 A CN 102890365A
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Abstract
The invention discloses a direct-downward type LED (Liquid Crystal Display) liquid crystal module which comprises a PCB (Printed Circuit Board) substrate, LED chip light sources, a diffusion light guide plate, a diffuser and a brightness enhancement film, wherein the LED chip light sources, the diffusion light guide plate, the diffuser and the brightness enhancement film are arranged on the PCB substrate. A plurality of pits are formed in a light entrance surface of the diffusion light guide plate, each pit is matched with the LED chip light source which is just under the pit, and a light outlet surface of the diffusion light guide plate is a cambered surface matched with the light entrance surface. The direct-downward type LED liquid crystal module disclosed by the invention meets the requirements on ultra-thinness, low power, high color gamut and high contrast.
Description
Technical field
The present invention relates to liquid crystal module, particularly a kind of straight-down negative LED liquid crystal module.
Background technology
In recent years, flat panel display has obtained the development of advancing by leaps and bounds, particularly liquid crystal display development, particularly liquid crystal display (Liquid Crystal Display, LCD) replaced rapidly conventional cathode ray tube (Cathode Ray Tube, CRT) display technique in various fields especially.But LCD needs backlight module as light source as non-autonomous light-emitting display device.Traditional LC D adopts cold-cathode fluorescence lamp (Cold Cat hode Fluorescent Lamp s, CCFL) as back light usually.Along with light emitting diode (Light Emit ting Diode, LED) develop rapidly of manufacturing and encapsulation technology, the RGB three-primary color LED because its luminescence efficiency is high, the life-span is long, but the wide frequency of operation of colour gamut is high, without advantages such as mercury, will replace the main flow that CCFL becomes the backlight field.
The led chip light source show the display quality that has determined to a certain extent liquid crystal display.The thickness of backlight has directly determined the thickness of liquid crystal display, if will realize ultrathin display spare, just needs to reduce the thickness of backlight.
At present, the LCD backlight module mainly adopts side entering type and straight-down negative.The LED of side-edge type backlight is installed in the side of liquid crystal panel, use light guide plate to carry out mixed light, colour mixture, and the white light that colour mixture is formed is coupled to liquid crystal panel, under large-size, uniformity of luminance and the luminosity of side-edge type backlight all are restricted, and the weight of light guide plate and cost also have greatly increased with the increase of size.By comparison, direct-light-type backlight, as shown in Figure 1, the LED11 array arrangement is also arranged the reflectance coating of one deck high reflectance on the PCB substrate 12 on PCB substrate 12, the LED emission of light that makes progress, mixed light effect by certain distance is penetrated, and this distance provides by PCB substrate 12 and diffusion sheet 13.Behind the mixed light, again by diffusion sheet 13, brightness enhancement film 14, obtain white light.Direct-light-type backlight technique is simple, its LED is installed in the backlight bottom surface, liquid crystal panel is coupled in its bright dipping easily expeditiously, while direct-light type LED backlight module, not only the space is large, is convenient to arrange more LED unit, also be convenient to shedding of heat, and the support area light regulating technology, the dynamic contrast of improving picture is had very significantly effect, thereby obtained using more and more widely.
The defective that prior art is deposited is, because used LED power major part is more than 0.3 watt, so LED quantity lacking with regard to usefulness of each backlight, then its distribution density is just very little, the distance of the crosslights between the led chip light source is large, for the light that utilizes LED to send, will cause the thickness of module larger; Because industry compares with price, the mode of white light that shows backlight adopts blue-light LED chip to send the complementary formation of the gold-tinted white light that blue light and yellow fluorescent powder (YAG or TAG) are stimulated more, this white light mode technology maturation and cost are lower, but the emission spectrum of the fluorescent powder that adopts is not had a continuous spectrum, colour rendering is relatively poor, be difficult to satisfy the requirement of low colour temperature illumination, luminous efficacy is high not enough, does not meet requirement energy-conservation, low-carbon (LC); Add that it is even the light of led array could to be mixed, and has so just limited the thickness of backlight, is unfavorable for that liquid crystal display is towards ultra-thin, low-power, high colour gamut, high-contrast future development because the direct-light type LED backlight structure must provide certain light mixing distance.
Summary of the invention
For the above-mentioned shortcoming that overcomes prior art with not enough, the object of the present invention is to provide a kind of straight-down negative LED liquid crystal module, realized ultra-thin, the low-power of straight-down negative LED liquid crystal module, high colour gamut, high contrast requirement.
Purpose of the present invention is achieved through the following technical solutions:
A kind of straight-down negative LED liquid crystal module comprises successively from the bottom to top the PCB substrate, is arranged in led chip light source, diffusing light guiding plate, diffusion sheet and brightness enhancement film on the PCB substrate.
The incidence surface of described diffusing light guiding plate arranges a plurality of depressions, and each depression and the led chip light source under it are complementary; The exiting surface of described diffusing light guiding plate is the cambered surface that is complementary with incidence surface.
Described PCB substrate below is provided with heating radiator.
The gap of described led chip light source is provided with reflectance coating.
Described diffusing light guiding plate is made by polymethylmethacrylate or makrolon material.
Described depression is hemisphere face or half ellipsoidal surface.
Described led chip light source is any two kinds in blue-ray LED, red-light LED, the green light LED.
Described led chip light source is comprised of blue-ray LED, red-light LED and green light LED.
The circuit connecting mode of described led chip light source is series, parallel or string and series-parallel connection.
Compared with prior art, the present invention has the following advantages and beneficial effect:
(1) the present invention is by having adopted diffusing light guiding plate, and the light part that the led chip light source is sent becomes white light by the diffusing light guiding plate mixed light, penetrates from incidence surface; Another part is reflected back the bottom surface, shine on the reflectance coating of bottom surface, return diffusing light guiding plate and carry out the mixed light second time, so just reduced the generation of speck, take full advantage of the light of LED emission, and light is mixed even in that shorter distance is interior, reduced the light mixing distance of direct LED backlight, the developing direction of ultra-thin, the low-power that has satisfied that industry pursues, high colour gamut, high contrast.
(2) the present invention is little, simple to operate to existing straight-down negative LED liquid crystal module change, cost is little, has popularity.
Description of drawings
Fig. 1 is the structural representation that the large scale liquid crystal of prior art shows the direct-light type LED backlight module that uses;
Fig. 2 is the structural representation of the straight-down negative LED liquid crystal module of embodiments of the invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
Embodiment 1
Such as Fig. 2, the straight-down negative LED liquid crystal module of present embodiment comprises successively from the bottom to top PCB substrate 11, is arranged in led chip light source 12, diffusing light guiding plate 15, diffusion sheet 13 and brightness enhancement film 14 on the PCB substrate.Described diffusing light guiding plate is fixed (when the diffusion light-guiding board size is larger by PC firmware all around, as more than 47 cun the time, be subjected to easily gravity deformation, then need to around be provided with little stilt support), draw diffusing light guiding plate from the optimum distance of PCB substrate by computer simulation.Diffusing light guiding plate is made by polymethylmethacrylate, its incidence surface arranges a plurality of hemisphere face depressions, each depression and the led chip light source under it are complementary, and incidence surface can be made by mode of printing, and its size can directly be calculated by following led light source parameter; The exiting surface of described diffusing light guiding plate is the cambered surface that is complementary with incidence surface, and its radius-of-curvature can be calculated by the size of incidence surface.
The led chip light source of this enforcement is comprised of blue-ray LED, red-light LED and green light LED, and array way is positive triarray, and the circuit connecting mode of led chip light source is series connection, and the gap of led chip light source is provided with reflectance coating.
The PCB substrate of this enforcement is arranged with heating radiator, by the dynamic backlight Region control, realizes the accurate control to backlight list lamp.
The course of work of present embodiment is as follows: blue-ray LED, the light that red-light LED and green light LED send is mixed light in the diffusing light guiding plate light mixing distance, then directly penetrating diffusing light guiding plate penetrates, part light is because the total reflection effect in addition, light reflection goes back to the below, after through the reflex of the reflectance coating on the gap of the led chip light source on the PCB substrate, see through again diffusing light guiding plate up or again be scattered, constantly repeat thus this process, pass the light of diffusing light guiding plate again through being mapped on the liquid crystal display after diffusion sheet and the brightness enhancement film effect, realize the high evenness mixed light, high color rendering index (CRI).
Embodiment 2
Present embodiment is except following feature, and all the other features are all same with embodiment 1:
Made by makrolon material on the diffusing light guiding plate of present embodiment, caving in is half ellipsoidal surface, and the led chip light source is comprised of blue-ray LED and red-light LED, and the circuit connecting mode of led chip light source is in parallel.
Embodiment 3
Present embodiment is except following feature, and all the other features are all same with embodiment 1:
The led chip light source is comprised of blue-ray LED and green light LED, and the circuit connecting mode of led chip light source is string and series-parallel connection.
Above-described embodiment is the better embodiment of the present invention; but embodiments of the present invention are not limited by the examples; shape such as depression can also be other shapes; the led chip light source can also be comprised of red-light LED and green light LED etc.; other any do not deviate from change, the modification done under Spirit Essence of the present invention and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (9)
1. a straight-down negative LED liquid crystal module is characterized in that, comprises successively from the bottom to top the PCB substrate, is arranged in led chip light source, diffusing light guiding plate, diffusion sheet and brightness enhancement film on the PCB substrate.
2. straight-down negative LED liquid crystal module according to claim 1 is characterized in that the incidence surface of described diffusing light guiding plate arranges a plurality of depressions, and each depression and the led chip light source under it are complementary; The exiting surface of described diffusing light guiding plate is the cambered surface that is complementary with incidence surface.
3. straight-down negative LED liquid crystal module according to claim 1 is characterized in that, described PCB substrate below is provided with heating radiator.
4. straight-down negative LED liquid crystal module according to claim 1 is characterized in that the gap of described led chip light source is provided with reflectance coating.
5. straight-down negative LED liquid crystal module according to claim 1 is characterized in that described diffusing light guiding plate is made by polymethylmethacrylate or makrolon material.
6. straight-down negative LED liquid crystal module according to claim 1 is characterized in that, described depression is hemisphere face or half ellipsoidal surface.
7. straight-down negative LED liquid crystal module according to claim 1 is characterized in that, described led chip light source is any two kinds in blue-ray LED, red-light LED, the green light LED.
8. straight-down negative LED liquid crystal module according to claim 1 is characterized in that, described led chip light source is comprised of blue-ray LED, red-light LED and green light LED.
9. straight-down negative LED liquid crystal module according to claim 1 is characterized in that, the circuit connecting mode of described led chip light source is series, parallel or string and series-parallel connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104040954A CN102890365A (en) | 2012-10-22 | 2012-10-22 | Direct-downward type LED (Liquid Crystal Display) liquid crystal module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104040954A CN102890365A (en) | 2012-10-22 | 2012-10-22 | Direct-downward type LED (Liquid Crystal Display) liquid crystal module |
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| CN102890365A true CN102890365A (en) | 2013-01-23 |
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| CN2012104040954A Pending CN102890365A (en) | 2012-10-22 | 2012-10-22 | Direct-downward type LED (Liquid Crystal Display) liquid crystal module |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016145670A1 (en) * | 2015-03-17 | 2016-09-22 | 深圳市华星光电技术有限公司 | Smart watch and liquid crystal screen |
| CN106609959A (en) * | 2016-12-27 | 2017-05-03 | 广州弥德科技有限公司 | A direct type directional backlight source |
| CN110312394A (en) * | 2019-06-27 | 2019-10-08 | Oppo广东移动通信有限公司 | A kind of shell, housing unit, electronic equipment and shell light-emitting control method |
| CN111308779A (en) * | 2020-03-05 | 2020-06-19 | 深圳市隆利科技股份有限公司 | Direct type backlight device and display equipment |
| CN113267936A (en) * | 2021-01-05 | 2021-08-17 | 青岛海信移动通信技术股份有限公司 | Electronic terminal |
| CN113409738A (en) * | 2021-05-25 | 2021-09-17 | 青岛海信医疗设备股份有限公司 | Backlight source circuit, control method thereof and display device |
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| JP2006236701A (en) * | 2005-02-23 | 2006-09-07 | Sony Corp | Backlight device and liquid crystal display |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016145670A1 (en) * | 2015-03-17 | 2016-09-22 | 深圳市华星光电技术有限公司 | Smart watch and liquid crystal screen |
| CN106609959A (en) * | 2016-12-27 | 2017-05-03 | 广州弥德科技有限公司 | A direct type directional backlight source |
| CN110312394A (en) * | 2019-06-27 | 2019-10-08 | Oppo广东移动通信有限公司 | A kind of shell, housing unit, electronic equipment and shell light-emitting control method |
| CN111308779A (en) * | 2020-03-05 | 2020-06-19 | 深圳市隆利科技股份有限公司 | Direct type backlight device and display equipment |
| CN113267936A (en) * | 2021-01-05 | 2021-08-17 | 青岛海信移动通信技术股份有限公司 | Electronic terminal |
| CN113409738A (en) * | 2021-05-25 | 2021-09-17 | 青岛海信医疗设备股份有限公司 | Backlight source circuit, control method thereof and display device |
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Application publication date: 20130123 |