TWI240827B - Liquid crystal display device module - Google Patents

Abstract

A liquid crystal display (LCD) device uses the light rays with short wavelength emitted from the back light source to excite the layer of fluorescent powders to make the white light. The red, green, and blue lights are presented after the white light pass through the color filter. Another method is made by using the light rays with short wavelength emitted from the back light source to excite the layer of fluorescent powders to display directly the red, green, and blue lights on the LCD panel without the color filter.

Description

1240827 V. Description of the invention (1) 1. [Technical field to which the invention belongs In particular, the present invention relates to a liquid crystal display device and a liquid crystal display device having a phosphor layer. 2. [Previous Technology] Liquid Crystal Display (LCD) is a non-self-luminous display, unlike plasma display (P 1 asma Pane 1 Display, PDP), Organic Light Emitting Diode (0LED) ), Cathode ray tube (Cathode Ray Tube, CRT) can emit light by itself, LCD needs to use external light source as light source. The current products used in liquid crystal display light sources can be divided into Electroluminescence (EL), Light Emitting Diode (LED) and Cold Cathode FI orescent Lamp (CCFL), of which CCFL And LED applications are more common. As a light source for liquid crystal displays, white LEDs have the advantages of power saving and small size. They have been widely used in small liquid crystal displays such as mobile phones, personal digital assistants (PDAs), digital cameras, and digital video cameras.

Page 5 1240827 V. Description of the invention (2) The schematic diagram of a conventional LCD display is shown in the first figure. The backlight module 1 1 includes components such as a white light LED 1 1 1, a reflective sheet 1 1 2, a light guide plate 1 1 3, a diffuser plate, and a cymbal. The white light emitted by the white light LED 1 1 1 can be directed to each other through a combination of these components. Upload to the transparent glass substrate 1 2. There are a plurality of thin film transistors (TFTs) 1 2 1 on the transparent glass substrate 1 2. Through the control of the thin film transistors, white light can pass through the liquid crystal layer 1 3 and reach a color filter on another transparent glass substrate 14 ( CF) 1 4 1. White light passes through the red (R) or green (G) or blue (B) sub-pixel on the color filter, and then it will appear red (R) or green (G) or blue (B). Finally displayed on the LCD panel. The electronic and optical components of a photodiode. The spectrum of LE D is longer than the three sources of white light with different wavelengths and two wavelengths of white light passing through a specific conductor. A type of semiconductor material that uses half-holes to emit photons and generate different frequencies of light. As the name implies, a white LED should be able to emit, but the so-called "white light" visible to the human eye is usually composed of light color, and a single Light-emitting diodes can only emit white light, but there is no way to directly emit white light, but as long as the appropriate light LED can produce blue light, yellow light mixed with white light, or red light, blue light, and green light mixed. Therefore, the so-called white LED refers to a product that uses LED as the light design and can finally produce white light. In 1996, Nichia released the InGaN / YAG single-crystal white LED. The white LED was officially commercialized. The related applications expanded with the improvement of the luminous efficiency of white LEDs. China's LED industry plays a pivotal role in global competition

Page 6 1240827 V. Description of the invention (3) The role is naturally unwilling to be absent from the development of white LEDs, but due to patent restraint and relatively backward technology, development is not smooth. But at present, other colors of LED light sources manufactured by domestic manufacturers, such as blue LED, red LED or green LEDS, are not inferior to foreign manufacturers in terms of bone strength, service life, and price, and blue LED, red LED or green Light LEDs are also better than white LEDs in terms of brightness and service life, but at a lower price. Based on the above reasons, if the liquid crystal display uses a non-white LED as a backlight, it will save manufacturing costs and increase product competitiveness. SUMMARY OF THE INVENTION In view of the above background of the invention, it is known that the use of white LED backlights is inferior to short-wavelength backlights such as blue LEDs in terms of brightness and service life, but the price is higher than short-wavelength backlights such as blue LEDs. Therefore, the present invention provides a new liquid crystal display device, which can save material costs and increase product competitiveness. An object of the present invention is to provide a liquid crystal display device which uses a short-wavelength backlight source such as blue LED to excite a phosphor layer on a transparent substrate and displays white light by mixing light. The wavelength light source replaces the white LED as the light source of the backlight module. Another object of the present invention is to provide a liquid crystal display device.

Page 7 1240827 V. Description of the invention (4) The principle of using a short-wavelength backlight such as a blue LED to excite a phosphor layer on a transparent substrate and to mix the light to show the principle of red, green or blue light, so Short-wavelength light sources such as blue LEDs can be used instead of white LEDs as the light source for backlight modules, and the need for color filters can be eliminated. According to the above-mentioned object, the present invention provides a liquid crystal display device, including: a backlight module having a light source that can emit light of a first wavelength; a first substrate having a plurality of thin-film transistors, and Above the backlight module; a phosphor layer is located above the first substrate; a color filter is located above the phosphor layer; a second substrate is located above the color filter; And a liquid crystal layer located between the first substrate and the second substrate, wherein the light with the first wavelength will first penetrate the phosphor layer and then reach the color filter. According to the above concept, wherein the first substrate and the second substrate are transparent substrates. According to the above concept, the backlight module is selected from the following: a direct-type backlight module and a side-emitting backlight module. According to the above concept, the light source is selected from the following: blue light, blue-violet light, violet light, UV light, and any combination thereof. According to the above concept, wherein the light source is a light emitting diode (LED) light

Page 8 1240827 V. Description of Invention (5) Source. According to the above-mentioned concept, the color filter has a plurality of red, green, and blue subdiurnal elements. According to the above-mentioned concept, the light particles in the phosphor layer can be excited from the light of the first wavelength to display white light by mixing light. According to the above concept, the phosphor layer is a composite layer of a red phosphor layer and a green phosphor layer. According to the above concept, the phosphor layer is a yellow phosphor layer. According to the above concept, the phosphor layer is a single layer in which the red phosphor and the green glory powder are uniformly mixed. According to the above-mentioned concept, the phosphor layer corresponding to the blue subday light on the color filter is a blue phosphor layer. According to the above-mentioned concept, the phosphor layer corresponding to the blue subdiurnal on the color filter is removed. According to the above-mentioned object, the present invention provides a liquid crystal display device, including: a backlight module having a light source, the light source can emit a

Page 1240827 V. Description of the invention (6) First wavelength light; a first substrate with a plurality of thin film transistors located above the backlight module; a phosphor powder layer with a plurality of red, green and blue The phosphor powder region of the color sub-dioxin is located above the first substrate; a second substrate is located above the color phosphor; and a liquid crystal layer is located between the first substrate and the second substrate Wherein, when the light of the first wavelength penetrates the phosphor layer, red light appears in the phosphor region of the red subdioxin, green light appears in the phosphor region of the green subdioxin, and in the blue The phosphor powder area of the color subdivision appears blue. According to the above concept, wherein the first substrate and the second substrate are transparent substrates. According to the above concept, the backlight module is selected from the following: a direct-type backlight module and a side-emitting backlight module. According to the above concept, the light source is selected from the following: blue light, blue-violet light, violet light, and UV light. According to the above concept, wherein the light source is a light emitting diode (LED) light source. 0 According to the above concept, wherein the phosphor layer corresponding to the phosphor region of the blue sub-day light in the phosphor layer is blue Color phosphor powder layer.

Page 10 1240827 V. Description of the invention (7) According to the above-mentioned concept, the phosphor layer corresponding to the blue subdiurnal phosphor region in the phosphor layer is removed. Fourth Embodiment] Some embodiments of the present invention will be described in detail as follows. However, in addition to the detailed description, the present invention can be widely implemented in other embodiments, and the scope of the present invention is not limited, which is subject to the scope of subsequent patents. The first embodiment of the present invention is shown in the schematic cross-sectional view of the liquid crystal display in the second figure. The backlight module 2 1 includes blue light LED 2 1 1, reflection sheet 2 1 2, light guide plate 2 13 and diffuser plate, cymbal, and other components. The blue light emitted by blue light LED 21 1 can be uploaded to the component through a combination of these components. Transparent glass substrate 2 2. The transparent glass substrate 22 has a plurality of thin film transistors (T F T) 2 2 1. Through the control of the thin film transistors, blue light can pass through the liquid crystal layer 23 and reach the phosphor layer 241 on the other transparent glass substrate 24. The camping powder layer 241 is a combination of two phosphor powder layers 2411 and 2412. The phosphor layer 2411 is a red phosphor layer, and the phosphor layer 2412 is a green phosphor layer, or the phosphor layer 2411 is a green phosphor layer, and the phosphor layer 2412 is a red phosphor layer. Both are OK. The blue light passes through the phosphor layer 2 4 1, and since the blue light is a short-wavelength light, the fluorescent particles in the phosphor layer 2 4 1 can be excited to emit white light after being mixed. When white light passes through the color filter (CF) 2 4 2, the sub-pixel on the color filter (CF) 24 2 is red (R) or green (G) or blue. (B) while presenting

Page 11 1240827 V. Description of the invention (8) Red (R) or green (G) or blue (B) is finally displayed on the panel of the liquid crystal display. The blue LED can also be changed to a short-wavelength LED of blue-violet LED, violet LED, or UV-LED. The phosphor layer 241 corresponding to the blue subdiurnal on the color filter 2 4 2 can also be changed to a blue phosphor layer, so that blue light passes through the phosphor layer 241 to emit blue light, and then passes through blue The color of the sub-pixel color filter displayed on the LCD panel is still blue. The blue sub-pixels on the color filter 2 4 2 can also have no phosphor powder layer 2 4 1, that is, the blue light is directly displayed on the LCD panel through the blue sub-day color filter, and the displayed color is still Is blue. The phosphor layer 241 may also be a single phosphor layer or a single yellow phosphor layer in which red phosphor and green phosphor are uniformly mixed. A second embodiment of the present invention is shown in a schematic cross-sectional view of a liquid crystal display in the third figure. The backlight module 31 includes components such as a blue LED 31 1, a reflective sheet 312, a light guide plate 3 13, a diffuser plate, and a cymbal. The blue light emitted by the blue LED 31 1 can be uploaded to the transparent glass substrate 3 through a combination of these components. 2. The transparent glass substrate 3 2 has a plurality of thin film transistors (TFTs) 3 2 1. Through the control of the thin film transistors, blue light can pass through the liquid crystal layer 3 3 and reach the phosphor layer 3 on another transparent glass substrate 3 4. 4 1. When the blue light passes through the phosphor layer 3 4 1 1 in the area where the red sub-dioxin is located, the blue light is short-wavelength light, so the fluorescent particles in the phosphor layer 3 4 1 1 can be excited and mixed. And glowed red. Similarly, when the blue light passes through the phosphor layer 3412 in the area where the green subdiurnal is located, the blue light is short-wavelength light, so the fluorescence in the phosphor layer 3 4 1 2 can be excited.

Page 12 1240827 V. Description of the invention (9) The particles emit green light after mixing light. When the blue light passes through the phosphor layer 3 4 1 3 in the area where the blue sub-pixels are located, the blue light is a short-wavelength light, so the fluorescent particles in the phosphor layer 3 4 1 3 can be excited and mixed. Light and emit blue light. The light that has passed through the phosphor layer 3 4 1 is finally displayed on the panel of the liquid crystal display as red (R) or green (G) or blue (B). The blue LED can also be changed to a short-wavelength LED such as a blue-violet LED, a purple LED, or a UV-LED. The area where the blue sub-pixels are located may also be free of the phosphor layer 3413, that is, the blue light is directly displayed on the LCD panel, and the displayed color is still blue. It should be noted that the side-emitting backlight module in the above embodiment may also be replaced by a direct-type backlight module, as shown in the fourth figure. The direct type backlight module 41 includes a light source 41 1, a reflection sheet 41 2, a light guide plate 413, a diffuser plate, and a prism sheet. Similarly, the light emitted from the light source 4 1 1 can be directed through a combination of these components. Uploaded to the transparent glass substrate, the subsequent process is the same as the above embodiment, so the description will not be repeated. Although the present invention has been described by citing several preferred embodiments, the invention is not limited to the illustrated embodiments. Although specific examples have been cited and described previously, it is obvious that other equivalent changes or modifications made without departing from the spirit disclosed by the present invention should be included in the scope of patent application of the present invention. In addition, all other similar and similar changes or modifications completed without departing from the spirit disclosed by the present invention also include

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Page 1240827 Brief Description of the Drawings The first figure shows a schematic cross-sectional view of a conventional liquid crystal display; the second figure shows a cross-sectional schematic view of a liquid crystal display according to the first embodiment of the present invention; A schematic cross-sectional view of a liquid crystal display of the second embodiment, and a schematic cross-sectional view of a direct type backlight module are shown in the fourth figure. t Schematic symbol description: 1 1, 2 1, 3 1: backlight module

1 1 1: White light LED 112 > 212, 312, 412: Reflective sheet 1 1 3, 2 1 3, 3 1 3, 4 1 3 ·· Light guide plate 1 2, 2 2, 3 2: Transparent glass substrate 1 2 1, 2 2 1, 3 2 1 ·· Thin film transistor 1 3, 2 3, 3 3: Liquid crystal layer 14, 24, 34: Another transparent glass substrate 1 4 1: Color filters 211, 311: Blue light LED 241, 341: phosphor layer 2411: red phosphor layer or green phosphor layer 2412: green phosphor layer or red phosphor layer

Page 12 1240827

Claims (1)

Scope of Patent Application 1. A liquid crystal display device comprising: a backlight module having a light source which can emit light of a first wavelength; a first substrate having a plurality of thin film transistors located on the backlight module Above; a phosphor layer on the first substrate; a color filter on the phosphor layer; a second substrate on the color filter; and a liquid crystal layer Is located between the first substrate and the second substrate, wherein the light of the first wavelength will first penetrate the phosphor layer and then reach the color filter ° 2. As described in item 1 of the scope of patent application The liquid crystal display device, wherein the first substrate and the second substrate are transparent substrates. 3. The liquid crystal display device described in item 1 of the scope of patent application, wherein the backlight module is selected from the following: a direct-type backlight module and a side-emitting backlight module. 4. The liquid crystal display device according to item 1 of the scope of patent application, wherein the light source is selected from the following: blue light, blue-violet light, violet light, UV light, and any combination of the foregoing. 5. The liquid crystal display device described in item 1 of the scope of patent application, wherein the Page 17 1240827 6. Scope of patent application The light source is a light emitting diode (LED) light source. 6. The liquid crystal display device according to item 1 of the scope of patent application, wherein the color filter has a plurality of red, green, and blue subdivisions. 7. The liquid crystal display device according to item 1 of the scope of the patent application, wherein the light particles in the phosphor layer can be excited by the light of the first wavelength to display white light through mixed light. 8. The liquid crystal display device according to item 1 of the scope of patent application, wherein the phosphor layer is a composite layer of a red phosphor layer and a green phosphor layer. 9. The liquid crystal display device according to item 1 of the scope of patent application, wherein the phosphor layer is a yellow phosphor layer. 10. The liquid crystal display device according to item 1 of the scope of patent application, wherein the light-emitting powder layer is a single uniformly mixed red fluorescent powder and green fluorescent powder. 11. The liquid crystal display device according to item 6 of the scope of application for a patent, wherein the phosphor layer corresponding to the blue subdiurnal on the color filter is a blue phosphor layer. 12. The liquid crystal display device described in item 6 of the scope of patent application, wherein Page 18 1240827 6. Scope of patent application The phosphor powder layer corresponding to the blue sub-pixels on the color filter is removed. 13. Liquid crystal display devices including: a backlight module having a light source, the light source may Emitting light of a first wavelength; a first substrate having a plurality of thin-film transistors located above the backlight module; a phosphor layer having a plurality of red, green, and blue phosphorescent regions of phosphor, located at Above the first substrate; a second substrate located above the color filter; and a liquid crystal layer located between the first substrate and the second substrate, wherein when the first wavelength light penetrates the After the phosphor layer, red light appears in the phosphor region of the red subdioxin, green light appears in the phosphor region of the green subdioxin, and blue light appears in the phosphor region of the blue subdioxin. 1 4. The liquid crystal display device according to item 13 of the scope of patent application, wherein the first substrate and the second substrate are transparent substrates. 15. The liquid crystal display device as described in item 13 of the scope of patent application, wherein the backlight module is selected from the following: a direct type backlight module and a side-emitting type backlight module. 16. The liquid crystal display device according to item 13 of the scope of patent application, wherein the light source is selected from the following: blue light, blue-violet light, violet light, and UV light. Page 19, 1240827 VI. Patent application scope ZWT, \ l / y item D 3 E one-L Section C enclosure Fan Jieli second special light, please send application as Ruyuan • Light ί7 · The installation instructions The source light of the crystal liquid is fluorescein, and the device of the crystal powder liquid light in the display area of the display area should be installed 13 times a day. The second color layer surrounds the blue powder fan. The light-emitting fluorescent color is blue. The layer of blue powder is as light layer, and the fluorescent powder 8 is light and fluorescent. It should be installed on the display area of the display area. The element of firefly description 13 times in the day, the blue color fan blue fan of the middle school, please apply the layer application powder Ruguang 9