CN1188300A - Liquid crystal display device using phosphor luminescence - Google Patents
Liquid crystal display device using phosphor luminescence Download PDFInfo
- Publication number
- CN1188300A CN1188300A CN97109392A CN97109392A CN1188300A CN 1188300 A CN1188300 A CN 1188300A CN 97109392 A CN97109392 A CN 97109392A CN 97109392 A CN97109392 A CN 97109392A CN 1188300 A CN1188300 A CN 1188300A
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- China
- Prior art keywords
- liquid crystal
- phosphor
- radiation source
- crystal display
- display device
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Abstract
The present invention LCD device using fluorescent intends to improve luminance characteristics of an image by equipping the device with a light source, a liquid crystal cell which is arranged on the light source, a fluorescent film which is excited with the light emitted by the light source, and a reflecting filter layer which reflects the light emitted by the fluorescent film.
Description
The present invention relates to a kind of liquid crystal display device, more specifically to a kind of liquid crystal display device that utilizes phosphor luminescence, by phosphor being excited this device, this display device can color display and is formed the display screen of high brightness.
Usually in liquid crystal display device, when being applied to voltage on the device, by changing the orientation of the liquid crystal material that between two parallel transparent electrode matrixes (matrix), exists, control the optical transmission rate whereby, transmitted light forms coloured images by some color filters then.
Being used in color filter in the conventional liquid crystal display device comprises various pigment and sends about 1/3rd of the light that gives off from radiating light source.Therefore the efficiency of this liquid crystal display device is low.In addition, in order to send enough light with display image, the liquid crystal display device for adopting color filter will use stronger radiating light source.
Recently, studying the liquid crystal display device that replaces color filter and utilize the red, green and blue phosphor in order to improve efficiency.In using the liquid crystal display device of various phosphors, the point type lines of phosphor are configured to consistent by the definite transfer point of the active electrode matrix of liquid crystal display.The various phosphor luminescences of the optical excitation with specific wavelength that utilization is sent by radiation source.
The conventional liquid crystal display device that utilizes the phosphor luminescence color display comprises: liquid crystal display; Radiation source, it launches the visible light that ultraviolet ray or wavelength are shorter than blue light; And phosphor layer, it is configured between liquid crystal display and the radiation source, perhaps is set in place on the liquid crystal display on the radiation source.Luminous by this phosphor layer of optical excitation that radiation source sends to form coloured image.
The advantage of utilizing the liquid crystal display device of phosphor luminescence to have is that the visual angle is wide and can improve colour purity.
When using liquid crystal display device, the light that is produced by phosphor shines to liquid crystal display and radiation source both direction.Yet in order to improve optical efficiency, the light that is sent by phosphor should shine towards the direction of liquid crystal display fully.
Yet, the isolated plant that the light that phosphor is sent reflexes to the direction opposite with radiation source is not housed in the liquid crystal display device of routine.Thereby the light that is sent by phosphor has a big chunk to lose, so the brightness of display screen descends.
The purpose of this invention is to provide a kind of liquid crystal display device that utilizes phosphor luminescence, it will be reflexed to the direction of liquid crystal cells fully by the light that phosphor sends, thereby form the display screen of high brightness.
In order to realize this purpose, the invention provides a kind of liquid crystal display device that utilizes phosphor luminescence, it comprises: radiation source, the light that it sends main emission peak wavelength is 380 to 410 nanometers (dark blue light); Be positioned at the liquid crystal cells on the radiation source; Phosphor layer, between radiation source and liquid crystal cells, luminous by the optical excitation that radiation source sends; Interference filter between radiation source and phosphor layer, is used for the light that phosphor layer produces is reflexed to the direction opposite with radiation source.
The present invention also provides a kind of liquid crystal display device that utilizes phosphor luminescence, and it comprises: radiation source, the light that it sends main emission peak wavelength is 380 to 410 nanometers (dark blue light); Be positioned at the liquid crystal cells on the radiation source; Phosphor layer is positioned on the liquid crystal cells, and is luminous by the optical excitation that radiation source sends; Interference filter between liquid crystal cells and phosphor layer, is used for the light that phosphor layer produces is reflexed to the direction opposite with radiation source.
Other purpose, advantage and novel feature part of the present invention introduced in the following description, partly hereinafter become clearly by research by those skilled in the art, perhaps understands by implementing the present invention.The combination that utilizes various Testing apparatus and particularly point out in the appended claims can realize and reach objects and advantages of the present invention.
Fig. 1 is the decomposition diagram of expression according to the liquid crystal display device of one embodiment of the invention; And
Fig. 2 is the sectional view according to the liquid crystal display device of an enforcement case of the present invention.
In following detailed description, only represent and a preferred embodiment of the present invention is described at the best mode of implementing to consider when of the present invention by the explanation inventor.It should be understood that do not departing from the scope of the present invention, can improve the present invention aspect different at each.
The invention provides a kind of liquid crystal display device that utilizes phosphor luminescence, it comprises: radiation source, the light that it sends main emission peak wavelength is 380 to 410 nanometers (dark blue light); Liquid crystal cells is positioned on the radiation source; Phosphor layer, the optical excitation of being sent by radiation source between radiation source and liquid crystal cells is luminous; And interference filter, between radiation source and phosphor layer, be used for the light that phosphor layer produces is reflexed to the direction opposite with radiation source.
The present invention also provides a kind of liquid crystal display device that utilizes phosphor luminescence, and it comprises: radiation source, the light that it sends main emission peak wavelength is 380 to 410 nanometers (dark blue light); Liquid crystal cells is positioned on the radiation source; Phosphor layer is positioned on the liquid crystal cells, and is luminous by the optical excitation that radiation source sends; Interference filter, between liquid crystal cells and phosphor layer, the light that is used for being produced by phosphor layer reflexes to the direction opposite with the radiation side.
This phosphor comprises the red, green and blue phosphor, and can comprise all can be by the phosphor of main emission peak wavelength light (dark blue light) the institute stimulated luminescence that is 380 to 410 nanometers.
Introduce a preferred embodiment of the present invention with reference to the accompanying drawings in more detail.
Fig. 1 is the skeleton view of liquid crystal display device of the present invention.Fig. 2 represents the sectional view of liquid crystal display device of the present invention.In Fig. 1 and Fig. 2, label 1 expression liquid crystal display.
Liquid crystal display 1 comprises: the liquid crystal layer 14a between two substrate 10a, 12a, two are configured in polaroid 16a, the 18a in substrate 10a, the 12a outside and the transparency conductive electrode 20a that forms on the inboard of substrate 10a, 12a.
Liquid crystal layer 14a can comprise twisted nematic (TN) liquid crystal or super-twist nematic (STN) liquid crystal, and ferroelectric type (FLC) liquid crystal or polymkeric substance diffusion-type (PDLC) liquid crystal etc.
Liquid crystal display device also comprises phosphor layer 3.The configuration of phosphor layer 3 need make its point of red, green and blue phosphor or lines consistent with the transfer point of being determined by the active electrode matrix of liquid crystal display 1.
Because phosphor layer 3 contains red, green and blue type phosphor, can adopt can be by all phosphors of light (dark blue light) the institute stimulated luminescence that to have main emission peak wavelength be 380 to 410 nanometers.
For example, phosphor comprises 6MgOAs
2O
5: Mn, 3.5MgO0.5MgF
2GeO
2: Mn, YVO
4: Eu
3+, SrY
2S
4: Eu
3+And SrY
2S
4: Mn; Green phosphor comprises: SrAl
2O
4: Eu
2+, SrGa
2S
4: Eu
2+, Y
3Al
5O
12: Ce
3+, ZnS:Cu, ZnS:Cu, Cl and ZnS:Cu, Cl, Al; And blue phospher comprises Sr
10(PO
4)
6Cl
2: Eu
2+, BaMgAl
10O
17: Eu
2+, Sr
3MgSi
2O
8: Eu
2+, Ba
3MgSiO
8: Eu
2+, ZnS:Ag, Cl and ZnS:Ag, Al.
Liquid crystal display device of the present invention also comprises a interference filter 7 between phosphor layer 3 and radiation source 5.Interference filter 7 sees through 90% the light that is sent by radiation source 5.In the course of work of liquid crystal display device, the light that interference filter 7 produces phosphor layer 3 reflexes to the direction opposite with radiation source 5.
Liquid crystal display device of the present invention is display image by utilizing the optical excitation light emitting phosphor layer 3 that sent by radiation source 5, thereby makes phosphor in the phosphor layer 3 produce colorama and colorama by liquid crystal display 1 display image.
In the liquid crystal display device course of work, the light that interference filter 7 sends phosphor layer 3 reflexes to the direction opposite with radiation source 5, makes total light output increase.
Therefore, owing to adopt interference filter 7 that the luminous quantity of the light that is produced by phosphor layer 3 is increased, and the brightness that has improved the image that shows by liquid crystal display 1.
Phosphor layer that has interference filter that is used for liquid crystal display device and the brightness that does not have the phosphor layer of interference filter are measured, and its result is illustrated in the following table 1.Brightness in the table 1 is the relative brightness that utilizes each phosphor layer of the luminous red, green, blue of the optical excitation of same intensity to form.
Table 1
| Brightness with phosphor layer of interference filter | The brightness that does not have the phosphor layer of interference filter | |
| Phosphor | ????58.1 | ????46.6 |
| Green phosphor | ????780 | ????604.3 |
| Blue phospher | ????57.2 | ????48.8 |
As shown in table 1, the brightness ratio of phosphor layer with liquid crystal display device of interference filter does not have the brightness high approximately 20% of phosphor layer of the liquid crystal display device of interference filter.
This embodiment has described the liquid crystal display device that comprises phosphor layer 3 and the interference filter 7 between liquid crystal display 1 and radiation source 5.Yet phosphor layer 3 and interference filter 7 can be positioned on the liquid crystal display 1 on the radiation source.
As mentioned above, by being positioned on the liquid crystal display 1, phosphor layer 3 and interference filter 7 prepare liquid crystal display device.Liquid crystal display device (" LCD ") with interference filter and the color coordinates and the brightness that do not have the LCD device of interference filter are measured, its result is illustrated in the following table 2.Brightness in table 2 is R, the G that utilizes the optical excitation of same intensity luminous, the relative brightness of each phosphor layer of B.
Table 2
| LCD device with interference filter | The LCD device that does not have interference filter | |||
| Color coordinates (x, y) | Brightness | Color coordinates (x, y) | Brightness | |
| Phosphor | ??0.5455，0.2686 | ??6.12 | ??0.486，0.2363 | ??4.08 |
| Green phosphor | ??0.2504，0.6014 | ??23.5 | ??0.2489，0.5969 | ??15.36 |
| Blue phospher | ??0.1522，0.066 | ??4.19 | ??0.1565，0.0612 | ??3.02 |
In addition, when forming black matrix (black matrix) between the figure at each phosphor layer, the contrast improvement when color display on the screen.
As mentioned above, the advantage of liquid crystal display device of the present invention is that the visual angle is wide, colour purity is improved, brightness improves.
In this open file, only represent and what introduce is a preferred embodiment of the present invention, but as mentioned above, be appreciated that, in the scope that does not break away from the inventive concept of expressing by this paper, the present invention can use by the various combination mode in various environment, and can change or retrofit.
Claims (4)
1. liquid crystal display device that utilizes phosphor luminescence comprises:
Radiation source, the light that it sends main emission peak wavelength is 380 to 410 nanometers;
Liquid crystal cells is positioned on the radiation source;
Phosphor layer, between radiation source and liquid crystal cells, luminous by the optical excitation that radiation source sends; And
Interference filter between radiation source and phosphor layer, is used for the light that phosphor layer produces is reflexed to the direction opposite with radiation source.
2. liquid crystal display device as claimed in claim 1, phosphor layer wherein comprises the red, green and blue phosphor, and various phosphor is 380 to 410 nanometers by main emission peak wavelength optical excitation is luminous.
3. liquid crystal display device that utilizes phosphor luminescence comprises:
Radiation source, the light that to send main emission peak wavelength be 380 to 410 nanometers;
Liquid crystal cells is positioned on the radiation source;
Phosphor layer, it is luminous to be positioned at the optical excitation of being sent by radiation source on the liquid crystal cells; And
Interference filter, between liquid crystal cells and phosphor layer, the light that is used for being produced by phosphor layer reflexes to the direction opposite with radiation source.
4. liquid crystal display device as claimed in claim 3, phosphor layer wherein comprises the red, green and blue phosphor, and various phosphor is 380 to 410 nanometers by main emission peak wavelength optical excitation is luminous.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97109392A CN1188300A (en) | 1996-12-30 | 1997-12-30 | Liquid crystal display device using phosphor luminescence |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR77980/96 | 1996-12-30 | ||
| CN97109392A CN1188300A (en) | 1996-12-30 | 1997-12-30 | Liquid crystal display device using phosphor luminescence |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1188300A true CN1188300A (en) | 1998-07-22 |
Family
ID=5171173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97109392A Pending CN1188300A (en) | 1996-12-30 | 1997-12-30 | Liquid crystal display device using phosphor luminescence |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1188300A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104460098A (en) * | 2013-09-22 | 2015-03-25 | 联想(北京)有限公司 | Liquid crystal display method and device |
| CN106526947A (en) * | 2015-09-10 | 2017-03-22 | 三星显示有限公司 | Color conversion panel and display device including the same |
| CN109216396A (en) * | 2017-06-30 | 2019-01-15 | 群创光电股份有限公司 | Show equipment |
-
1997
- 1997-12-30 CN CN97109392A patent/CN1188300A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104460098A (en) * | 2013-09-22 | 2015-03-25 | 联想(北京)有限公司 | Liquid crystal display method and device |
| CN106526947A (en) * | 2015-09-10 | 2017-03-22 | 三星显示有限公司 | Color conversion panel and display device including the same |
| CN106526947B (en) * | 2015-09-10 | 2021-04-09 | 三星显示有限公司 | Color conversion panel and display device including the same |
| CN109216396A (en) * | 2017-06-30 | 2019-01-15 | 群创光电股份有限公司 | Show equipment |
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