CN1321344C - Liquid crystal display device - Google Patents

Liquid crystal display device Download PDF

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Publication number
CN1321344C
CN1321344C CNB2003101010962A CN200310101096A CN1321344C CN 1321344 C CN1321344 C CN 1321344C CN B2003101010962 A CNB2003101010962 A CN B2003101010962A CN 200310101096 A CN200310101096 A CN 200310101096A CN 1321344 C CN1321344 C CN 1321344C
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CN
China
Prior art keywords
light
powder layer
lcd device
phosphor
substrate
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Expired - Fee Related
Application number
CNB2003101010962A
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Chinese (zh)
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CN1607429A (en
Inventor
麦哲魁
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TPO Displays Corp
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Toppoly Optoelectronics Corp
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Priority to CNB2003101010962A priority Critical patent/CN1321344C/en
Publication of CN1607429A publication Critical patent/CN1607429A/en
Application granted granted Critical
Publication of CN1321344C publication Critical patent/CN1321344C/en
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Abstract

The present invention relates to a liquid crystal display which comprises a back light module, a first base plate, a fluorescent powder layer, a color filter, a second base plate and a liquid crystal layer, wherein the back light module is provided with a light source which can emit first wave length lights; the first base plate is provided with a plurality of thin film transistors, and is arranged above the back light module; the fluorescent powder layer is arranged above the first base plate, the color filter is arranged above the fluorescent powder layer, and the second base plates is arranged above the color filter; the liquid crystal layer is arranged between the first base plate and the second base plate, wherein the first wavelength light rays firstly penetrate through the fluorescent powder layer, and then reach the color filter; the fluorescent powder layer is excited by short wavelength light rays emitted by a back light source to generate white light, and the white light subsequently penetrates through the color filter and formes three primary colors of red, green and blue. The present invention also relates to an another method that the fluorescent powder layer is excited by the short wavelength light rays emitted by the back light source to directly generate red light, green light, or blue light, and the light can be displayed on a panel of the liquid crystal display without the color filter.

Description

LCD device
Technical field
The present invention relates to a kind of LCD device, particularly at a kind of LCD device with phosphor powder layer.
Background technology
LCD (Liquid Crystal Display, LCD) the self luminous display of right and wrong, unlike plasma display (Plasma Panel Display, PDP), organic electro-luminescent display (Organic LightEmitting Diode, OLED), cathode-ray tube (CRT) (Cathode Ray Tube, CRT) can be luminous voluntarily, LCD need utilize external light source to originate as light.
The employed product of LCD light source can be divided into electroluminescence (Electroluminescence at present, EL), light emitting diode (Light Emitting Diode, LED) with cold-cathode fluorescence lamp (Cold Cathode Florescent Lamp, CCFL), wherein use comparatively general with CCFL and LED.White light LEDs is as the LCD light source, has little or the like the advantage of power saving, volume, be widely used at present mobile phone, personal digital assistant (Personal Digital Assistant, PDA), in the small-sized LCD such as digital camera, digital camera shadow machine.
Existing LCD diagrammatic cross-section is asked for an interview shown in Figure 1.Backlight module 11 has comprised members such as white light LEDs 111, reflector plate 112, light guide plate 113 and diffuser plate, prismatic lens, and the white light that white light LEDs 111 is launched can be through the combination of a little members thus and to uploading to transparent glass substrate 12.A plurality of thin film transistor (TFT)s (TFT) 121 are arranged on the transparent glass substrate 12, and via the control of thin film transistor (TFT), white light can pass the colored filter (CF) 141 that liquid crystal layer 13 arrives on another transparent glass substrate 14.White light promptly can present redness (R) or green (G) or blue (B) through the inferior pixel (Sub-pixel) of red (R) on the colored filter or green (G) or blue (B), is presented at last on the panel of LCD.
Light emitting diode (LED) is a kind ofly to be made of semiconductor material, utilizes the electronics in the semiconductor to combine and send photon with the hole, produces the light-emitting component of the spectrum of different frequency.As its name suggests, white light LEDs should be a LED that can send " white light ", but so-called human eye visible " white light " normally is made up of two kinds of photochromic institutes more than the wavelength, and single light emitting diode can only send very narrow spectrum, way is not directly sent white light, but as long as the LED of suitable combination different colours light can produce the two wavelength white lights that mix as blue light, sodium yellow, or the three-wavelength white light that mixes of red light, blue light, green light.Therefore, so-called white light LEDs is meant with LED to be light source, through specific design, finally can produce the product of white light.
Nichia delivered InGaN/YAG single die white light LEDs in 1996, and white light LEDs formally marches toward commercialization, and relevant application enlarges along with the raising of white light LEDs luminescence efficiency.China's LED industry is played the part of very important role in global competition, also be reluctant absence for white light LEDs development nature, but owing to be subject to the patent strangulation and technology is backward relatively, develops not smooth.But the led light source of other colors of present domestic manufacturers manufacturing, for example blue-ray LED, red-light LED or green light LED are on brightness, serviceable life, price and not second to foreign vendor, and blue-ray LED, red-light LED or green light LED are in brightness, also good than white light LEDs on serviceable life, and price is cheaper.For these reasons, LCD can be saved manufacturing cost if adopt non-white light LEDs as backlight, increase competitiveness of product.
Summary of the invention
In above-mentioned background of invention, the existing white light LEDs backlight that uses is in brightness, poor than short wavelength's backlights such as blue-ray LEDs on serviceable life, but price is than short wavelength's backlight height such as blue-ray LEDs.So the invention provides a kind of new LCD device, can save material cost, increase competitiveness of product.
One object of the present invention, be to provide a kind of LCD device, it utilizes short wavelength's backlights such as blue-ray LED can excite the phosphor powder layer that is positioned on the transparency carrier, therefore the principle that presents white light through mixed light can use short wavelength light source such as blue-ray LED to replace the light source that white light LEDs becomes backlight module.
Another object of the present invention, be to provide a kind of LCD device, it utilizes short wavelength's backlights such as blue-ray LED can excite the phosphor powder layer that is positioned on the transparency carrier, the principle that presents ruddiness, green glow or blue light through mixed light, therefore can use short wavelength light source such as blue-ray LED to replace the light source that white light LEDs becomes backlight module, can remove the demand of colored filter simultaneously.
According to above-described purpose, the invention provides a kind of LCD device, comprising: a backlight module, have a light source, this light source can be launched one first wavelength light source; One first substrate has a plurality of thin film transistor (TFT)s, is positioned at the top of this backlight module; One phosphor powder layer is positioned at the top of this first substrate; One colored filter is positioned at the top of this phosphor powder layer; One second substrate is positioned at the top of this colored filter; And a liquid crystal layer, the position is between this first substrate and this second substrate, and wherein this first wavelength light arrives penetrate this phosphor powder layer earlier in this colored filter again.
According to above-mentioned conception, wherein this first substrate and second substrate are transparency carrier.
According to above-mentioned conception, wherein this backlight module is selected from following: direct type backlight module and lateral emitting formula backlight module.
According to above-mentioned conception, wherein this light source is selected from following: blue light, royal purple light, purple light, UV light and aforesaid combination in any.
According to above-mentioned conception, wherein this light source is light emitting diode (LED) light source.
According to above-mentioned conception, wherein this colored filter has the inferior pixel of a plurality of redness, green, blueness.
According to above-mentioned conception, wherein can excite fluorescent particle in this phosphor powder layer from this first wavelength light, present white light via mixed light.
According to above-mentioned conception, wherein this phosphor powder layer is the composite bed of red fluorescence bisque and green phosphor layer.
According to above-mentioned conception, wherein this phosphor powder layer is the yellow fluorescence bisque.
According to above-mentioned conception, wherein this phosphor powder layer is red fluorescence powder and the mixed uniformly simple layer of green emitting phosphor.
According to above-mentioned conception, wherein this colored filter blue time pairing this phosphor powder layer of pixel is a blue phosphor layer.
According to above-mentioned conception, wherein this colored filter blue time pairing this phosphor powder layer of pixel is removed.
According to above-described purpose, the invention provides a kind of LCD device, comprising: a backlight module, have a light source, this light source can be launched one first wavelength light source; One first substrate has a plurality of thin film transistor (TFT)s, is positioned at the top of this backlight module; One phosphor powder layer has the phosphor area of a plurality of redness, green, blue sub-pixels, is positioned at the top of this first substrate; One second substrate is positioned at the top of this phosphor powder layer; An and liquid crystal layer, the position is between this first substrate and this second substrate, wherein behind this this phosphor powder layer of first wavelength light penetration, phosphor area in this redness time pixel presents ruddiness, phosphor area in this green time pixel presents green glow, phosphor area in this blue sub-pixels presents blue light, and wherein pairing this phosphor powder layer of phosphor area of time pixel of this indigo plant in this phosphor powder layer is blue phosphor layer or is removed.
According to above-mentioned conception, wherein this first substrate and second substrate are transparency carrier.
According to above-mentioned conception, wherein this backlight module is selected from following: direct type backlight module and lateral emitting formula backlight module.
According to above-mentioned conception, wherein this light source is selected from following: blue light, royal purple light, purple light and UV light.
According to above-mentioned conception, wherein this light source is light emitting diode (LED) light source.
According to above-mentioned conception, wherein pairing this phosphor powder layer of the phosphor area of this blue sub-pixels in this phosphor powder layer is a blue phosphor layer.
According to above-mentioned conception, wherein pairing this phosphor powder layer of the phosphor area of this blue sub-pixels in this phosphor powder layer is removed.
Description of drawings
What Fig. 1 showed is existing LCD diagrammatic cross-section;
What Fig. 2 showed is the LCD diagrammatic cross-section of first embodiment of the invention;
What Fig. 3 showed is the LCD diagrammatic cross-section of second embodiment of the invention; And
What Fig. 4 showed is a kind of diagrammatic cross-section of the direct-light-type backlight mould utmost point.
Description of reference numerals
11,21,31 backlight modules, 111 white light LEDs
112,212,312,412 reflector plates, 113,213,313,413 light guide plate
12,22,32 transparent glass substrates, 121,221,321 thin film transistor (TFT)s
14,24,34 another transparent glass substrate 13,23,33 liquid crystal layers
141 colored filters, 211,311 blue-ray LEDs
241,341 phosphor powder layers, 242 colored filters
2411 red fluorescence bisque or green phosphor layers
2412 green phosphor layers or red fluorescence bisque
3411 red pixel regions
3412 green pixel regions
3413 blue sub-pixels regions
41 direct-light-type backlight modules
411 light sources
Embodiment
Some embodiments of the present invention can be described in detail as follows.Yet except describing in detail, the present invention can also be widely implements at other embodiment, and scope of the present invention do not limited, and it is as the criterion with appended claim.
The first embodiment of the present invention is asked for an interview the diagrammatic cross-section of Fig. 2 LCD.Backlight module 21 has comprised members such as blue-ray LED 211, reflector plate 212, light guide plate 213 and diffuser plate, prismatic lens, and the blue light that blue-ray LED 211 is launched can be through the combination of a little members thus and to uploading to transparent glass substrate 22.A plurality of thin film transistor (TFT)s (TFT) 221 are arranged on the transparent glass substrate 22, and via the control of thin film transistor (TFT), blue light can pass the phosphor powder layer 241 that liquid crystal layer 23 arrives on another transparent glass substrate 24.Phosphor powder layer 241 is combined by two-layer phosphor powder layer 2411,2412.Phosphor powder layer 2411 is the red fluorescence bisque, and phosphor powder layer 2412 is a green phosphor layer, and perhaps phosphor powder layer 2411 is a green phosphor layer, all can and phosphor powder layer 2412 is the red fluorescence bisque.Blue light penetration phosphor layer 241 will be short wavelength's light because of blue light, so but the fluorescent particle in the fluorescence excitation bisque 241 sends white light through mixed light.When white light during through colored filter (CF) 242, promptly can be presented at last on the panel of LCD with the inferior pixel (Sbu-pixel) on the colored filter (CF) 242 for red (R) or green (G) or blue (B) presents redness (R) or green (G) or blue (B).
Blue-ray LED also can change the short wavelength LED of blue purple LED, purple LED or UV-LED etc. into.The colored filter 242 blues time pairing phosphor powder layer 241 of pixel also can change blue phosphor layer into, so blue light passes phosphor powder layer 241 and can send blue light, is presented at color on the panel of LCD still for blue through the colored filter of blue sub-pixels again.Colored filter 242 blues time pixel also can not have phosphor powder layer 241, and promptly blue light directly is presented on the panel of LCD through the colored filter of blue sub-pixels, and the color of its demonstration still is blue.Phosphor powder layer 241 also can be red fluorescence powder and the mixed uniformly single-component phosphor layer of green emitting phosphor or single yellow fluorescence bisque constitutes.
The second embodiment of the present invention is asked for an interview the diagrammatic cross-section of Fig. 3 LCD.Backlight module 31 has comprised members such as blue-ray LED 311, reflector plate 312, light guide plate 313 and diffuser plate, prismatic lens, and the blue light that blue-ray LED 311 is launched can be through the combination of a little members thus and to uploading to transparent glass substrate 32.A plurality of thin film transistor (TFT)s (TFT) 321 are arranged on the transparent glass substrate 32, and via the control of thin film transistor (TFT), blue light can pass the phosphor powder layer 341 that liquid crystal layer 33 arrives on another transparent glass substrate 34.When blue light passes the phosphor powder layer 3411 of red time pixel region, will because of blue light short wavelength's light, so but the fluorescent particle in the fluorescence excitation bisque 3411 sends ruddiness through mixed light.In like manner, when blue light passes the phosphor powder layer 3412 of green time pixel region, will because of blue light short wavelength's light, so but the fluorescent particle in the fluorescence excitation bisque 3412 sends green glow through mixed light.When blue light passes the phosphor powder layer 3413 of blue sub-pixels region, will because of blue light short wavelength's light, so but the fluorescent particle in the fluorescence excitation bisque 3413 sends blue light through mixed light.These light through phosphor powder layer 341 are presented at last and present redness (R) or green (G) or blue (B) on the panel of LCD.
Blue-ray LED also can change the short wavelength LED of blue purple LED, purple LED or UV-LED etc. into.The blue sub-pixels region also can not have phosphor powder layer 3413, and promptly blue light directly is presented on the panel of LCD, and the color of its demonstration still is blue.
Be noted that lateral emitting formula backlight source module in the foregoing description also can use the direct-light-type backlight module to replace, as shown in Figure 4.Direct type backlight module 41 has comprised members such as light source 411, reflector plate 412, light guide plate 413 and diffuser plate, prismatic lens, same, the light of launching from light source 411 can be through the combination of a little members thus and to uploading to transparent glass substrate, because of subsequent process same as the previously described embodiments, so no longer repeat specification.
Even the present invention describes by enumerating several preferred embodiments, but the present invention is not limited to the embodiment that enumerated.Though the specific embodiment of before enumerating and narrating, apparently, other does not break away under the disclosed spirit, and the equivalence of being finished changes or modifies, and all should be included in the claim of the present invention.In addition, all other do not break away under the disclosed spirit, and other that finished are similar and approximate to be changed or modification, also all is included in the claim of the present invention.Should explain scope of the present invention with the widest definition simultaneously, use and comprise all modifications and similar structures.

Claims (17)

1. LCD device comprises:
One backlight module has a light source, and this light source can be launched one first wavelength light;
One first substrate has a plurality of thin film transistor (TFT)s, is positioned at the top of this backlight module;
One phosphor powder layer is positioned at the top of this first substrate;
One colored filter is positioned at the top of this phosphor powder layer;
One second substrate is positioned at the top of this colored filter; And
One liquid crystal layer, between this first substrate and second substrate, wherein this first wavelength light arrives penetrate this phosphor powder layer earlier in this colored filter again.
2. LCD device as claimed in claim 1, wherein this first substrate and second substrate are transparency carrier.
3. LCD device as claimed in claim 1, wherein this backlight module is selected from following: direct type backlight module and lateral emitting formula backlight module.
4. LCD device as claimed in claim 1, wherein this light source is selected from following: blue light, royal purple light, purple light, UV light and aforesaid combination in any.
5. LCD device as claimed in claim 1, wherein this light source is a LED source.
6. LCD device as claimed in claim 1, wherein this colored filter has the inferior pixel of a plurality of redness, green, blueness.
7. LCD device as claimed in claim 1 wherein can excite fluorescent particle in this phosphor powder layer from this first wavelength light, presents white light via mixed light.
8. LCD device as claimed in claim 1, wherein this phosphor powder layer is the composite bed of red fluorescence bisque and green phosphor layer.
9. LCD device as claimed in claim 1, wherein this phosphor powder layer is the yellow fluorescence bisque.
10. LCD device as claimed in claim 1, wherein this phosphor powder layer is red fluorescence powder and the mixed uniformly simple layer of green emitting phosphor.
11. LCD device as claimed in claim 6, wherein this colored filter blue time pairing this phosphor powder layer of pixel is a blue phosphor layer.
12. LCD device as claimed in claim 6, wherein this colored filter blue time pairing this phosphor powder layer of pixel is removed.
13. a LCD device comprises:
One backlight module has a light source, and this light source can be launched one first wavelength light;
One first substrate has a plurality of thin film transistor (TFT)s, is positioned at the top of this backlight module;
One phosphor powder layer has the phosphor area of a plurality of red, green, blues time pixel, is positioned at the top of this first substrate;
One second substrate is positioned at the top of this phosphor powder layer; And
One liquid crystal layer is between this first substrate and second substrate, wherein behind this this phosphor powder layer of first wavelength light penetration, phosphor area in this red pixel presents ruddiness, phosphor area in this green pixel presents green glow, presents blue light in the phosphor area of this indigo plant time pixel
Wherein pairing this phosphor powder layer of phosphor area of time pixel of this indigo plant in this phosphor powder layer is blue phosphor layer or is removed.
14. LCD device as claimed in claim 13, wherein this first substrate and second substrate are transparency carrier.
15. LCD device as claimed in claim 13, wherein this backlight module is selected from following: direct type backlight module and lateral emitting formula backlight module.
16. LCD device as claimed in claim 13, wherein this light source is selected from following: blue light, royal purple light, purple light and UV light.
17. LCD device as claimed in claim 13, wherein this light source is a LED source.
CNB2003101010962A 2003-10-14 2003-10-14 Liquid crystal display device Expired - Fee Related CN1321344C (en)

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CN1321344C true CN1321344C (en) 2007-06-13

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US8128272B2 (en) 2005-06-07 2012-03-06 Oree, Inc. Illumination apparatus
US8172447B2 (en) 2007-12-19 2012-05-08 Oree, Inc. Discrete lighting elements and planar assembly thereof
US8182128B2 (en) 2007-12-19 2012-05-22 Oree, Inc. Planar white illumination apparatus
US8215815B2 (en) 2005-06-07 2012-07-10 Oree, Inc. Illumination apparatus and methods of forming the same
US8231237B2 (en) 2008-03-05 2012-07-31 Oree, Inc. Sub-assembly and methods for forming the same
US8272758B2 (en) 2005-06-07 2012-09-25 Oree, Inc. Illumination apparatus and methods of forming the same
US8297786B2 (en) 2008-07-10 2012-10-30 Oree, Inc. Slim waveguide coupling apparatus and method
US8328406B2 (en) 2009-05-13 2012-12-11 Oree, Inc. Low-profile illumination device
US8591072B2 (en) 2011-11-16 2013-11-26 Oree, Inc. Illumination apparatus confining light by total internal reflection and methods of forming the same
US8624527B1 (en) 2009-03-27 2014-01-07 Oree, Inc. Independently controllable illumination device
US8727597B2 (en) 2009-06-24 2014-05-20 Oree, Inc. Illumination apparatus with high conversion efficiency and methods of forming the same
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US8641254B2 (en) 2005-06-07 2014-02-04 Oree, Inc. Illumination apparatus
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US9164218B2 (en) 2008-07-10 2015-10-20 Oree, Inc. Slim waveguide coupling apparatus and method
US8624527B1 (en) 2009-03-27 2014-01-07 Oree, Inc. Independently controllable illumination device
US8328406B2 (en) 2009-05-13 2012-12-11 Oree, Inc. Low-profile illumination device
US8727597B2 (en) 2009-06-24 2014-05-20 Oree, Inc. Illumination apparatus with high conversion efficiency and methods of forming the same
US8840276B2 (en) 2011-11-16 2014-09-23 Oree, Inc. Illumination apparatus confining light by total internal reflection and methods of forming the same
US9039244B2 (en) 2011-11-16 2015-05-26 Oree, Inc. Illumination apparatus confining light by total internal reflection and methods of forming the same
US8591072B2 (en) 2011-11-16 2013-11-26 Oree, Inc. Illumination apparatus confining light by total internal reflection and methods of forming the same
US9857519B2 (en) 2012-07-03 2018-01-02 Oree Advanced Illumination Solutions Ltd. Planar remote phosphor illumination apparatus

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