TWI316729B - Flat fluorescent lamp and liquid crystal display - Google Patents

Description

13 1 67 〇 ITW 18719 twf.doc / 006 IX. Description of the Invention: [Technical Field] The present invention relates to a light source module and display skirt, and in particular to a plane having high luminous efficiency Fluorescent lamp (FFL) and liquid crystal display using this flat fluorescent lamp. [Prior Art] With the advancement of modern video technology, liquid crystal displays have been widely used in the display screens of mobile phones, notebook computers, personal computers, and personal digital assistant (pDA)/portable electronic products. However, since the liquid crystal panel of the liquid crystal display itself does not have the function of emitting light, it is necessary to arrange a backlight module under the liquid crystal panel to provide a display light source required for the liquid crystal panel. Currently, backlight modules on the market mainly use flat fluorescent lamps, cold cathode fluorescent lamps (CCFLs) and light emitting diodes (LEDs), among which flat fluorescent lamps have costs. It is widely used in liquid crystal displays because of its low cost and small space. 1 is a partial cross-sectional view of a conventional flat fluorescent lamp, and FIG. 2 is a top view of the flat fluorescent lamp, wherein in order to make the illustration clear, FIG. 2 does not show some of the components in FIG. Referring to FIGS. 1 and 2, a conventional planar fluorescent lamp 100 is formed with a plurality of discharge spaces 132 between the upper substrate 12 and the lower substrate 11 by spacers 130, wherein the discharge space 132 is filled with a discharge gas 140. . In addition, an electrode group 150 is disposed on the lower substrate 11 in each of the discharge spaces 132, and includes a first strip electrode 152 and a second strip electrode 154 (which may be anode and cathode respectively), and the electrode group 15 is covered with There is a 13 1 672 today 80ITW 18719twf.cioc / 〇〇 6 electrical layer 160 to protect the electrode group 15 〇. Further, a fluorescent material i7 is coated on the upper substrate 120 and the outer wall of the dielectric layer 16A. = The driving voltage is applied to the electrode group, and an electric field can be generated between the first strip electrode and the strip electrode 154, so that the discharge gas 140 and the earth electricity water are 'electron in the electropolymerization. When the ultraviolet ray emitted from the electricity is emitted to the camping material 17G, the luminescent material 17 〇 emits light.

It is worth mentioning that it is conventionally known that the electric field is used for the discharge gas (10) =, and a plurality of electrodes 7 are generally formed on both sides of the first strip electrode 152 to be used by the tip of the electrode branch 152a. The main discharge region 156 having a three-Shaw shape is formed with the second strip electrode 154 of the noodle shape. However, in actual operation, the brightness of the discharge region 156 and other regions other than the discharge region 156 tends to be greatly different, which affects the overall surface uniformity. In the case of the base view, when the brightness of the tip of the electrode 152a reaches 1 〇〇〇〇 nit, the brightness of other areas is only 6000 mt, and when the brightness of the tip of the electrode branch 152a is 7 〇〇〇 nit, the other The brightness of the area is only 4000 nit. SUMMARY OF THE INVENTION In view of the above, it is an object of the present invention to provide a planar fluorescent lamp which has better luminous efficiency and can output a uniform surface light source. Another object of the present invention is to provide a liquid crystal display which achieves a better display effect by the above-described planar fluorescent lamp. In order to achieve the above or other (four), the present invention proposes a planar glory lamp, including - a first substrate, a plurality of electrode groups, a patterned dielectric layer, a plurality of 131,672 pounds, 8 〇itw 18719 twf.doc / 006 number 'I electric branch a second substrate, a plurality of Raleigh μ-number spacers, a phosphor material, and a plurality of mutually parallel------------------------------------- ^ Electrode branch. In addition, the _ 介 雷 结 结 ^ ^ 条 条 条 条 ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ 条 条 条The substrate is connected to the second substrate to form a plurality of discharge spaces between the first substrate and the second substrate. Each of the discharge spaces has an electrical group, and the fluorescent material and the discharge gas are disposed in the discharge space. In an embodiment of the invention, the dielectric branch may be adjacent to the patterned dielectric layer above the first strip electrode or adjacent to the second strip electrode over the dielectric layer. Μ In the embodiment of the invention, the dielectrics on both sides of each electrode branch are parallel to each other. In the embodiment of the present invention, a plurality of discharge regions are formed between the electrode branches on each of the first strip electrodes and the second strip electrodes opposed thereto, and dielectric branches are disposed along the edges of the discharge regions. In the embodiment of the invention, the 'partial phosphor material may be distributed on both side walls of each of the dielectric branches. Wherein, the side of each dielectric branch away from the electrode branch may have more fluorescing material than the side of the adjacent electrode branch. In an embodiment of the invention, the patterned dielectric layer above each of the second strip electrodes has a plurality of recesses, wherein the recesses in each of the discharge spaces are, for example, 131 672^8〇itw i8719twf.d〇c/〇〇 6

In an embodiment of the invention, the emitter layer is disposed on the first substrate, and the planar fluorescent lamp further includes an opposite reflector and is located below the electrode group. The invention further provides a liquid crystal display fluorescent lamp and a liquid crystal panel, which is mainly composed of the above-mentioned plane 'the planar fluorescent lamp is arranged beside the liquid helium panel for providing the liquid crystal panel display. The backlight /, ^ in the above-mentioned 'Benfa County electrode branch off _ Cheng recorded dielectric branch Μ敕 2 2 plus the coating area of the fluorescent material' and can be used to branch the location of the glory material by dielectric branch, so there is Help to improve the flat glory = and can improve the uniformity of the light, so that the liquid crystal display H has a better display. The above and other objects, advantages and advantages of the present invention will become more apparent and will be described in detail below. [Embodiment] The present invention can be applied to various types of flat fluorescent lamps to improve the problem of uneven light emission due to the tip discharge phenomenon of the electrode branches. In the conventional flat fluorescent lamps, the electrode groups are arranged in different ways. For example, each discharge space has only a pair of first strip electrodes and a second strip electrode, or may have alternates. Most of the first strips of electricity are arranged = and the second strip electrodes, and the shape of the electrode branches is more varied, for example, a square, a circular arc, a 131672980^18719twf.doc/006, or a triangle. The following embodiments will be described by way of example only. However, it is not intended to limit the scope of application of the present invention. The existing planar fluorescent lamps can adopt the dielectric branch design and the ten concept proposed by the present invention. To improve the uniformity of light output, or to further improve the light extraction efficiency. Figure 3 is a partial cross-sectional view of a planar fluorescent lamp in accordance with a preferred embodiment of the present invention. As shown in FIG. 3, the flat fluorescent lamp 300 includes a first substrate.

31A, a second substrate 320, a plurality of spacers 330, a discharge gas 340, a plurality of electrode groups 350, a patterned dielectric layer 360, and a phosphor material 370. The first substrate 310 and the second substrate 320 are disposed opposite to each other, and the wall 330 is connected between the first substrate 31 〇 and the second substrate 32 , to form a plurality of discharge spaces 332 between the first substrate and the second substrate. .

Referring to FIG. 3, the discharge space 332 is filled with a discharge gas 340, which is, for example, an inert gas such as helium, neon or argon, and the electrode group 35 is disposed on the first substrate 310, wherein each electrode group 35 The crucible includes a first strip electrode 352 and a second strip electrode 354 which are alternately arranged, which are, for example, an anode and a cathode. Further, the patterned dielectric layer 360 covers the electrode group 35A to protect the electrode group 35 from direct bombardment by plasma ions. For example, the 370 is coated on the second substrate 32 and the dielectric layer is fine, and the first substrate 310 is further formed, for example, as a reflective layer 312, which is made of metal, for example, and is located under the electrode group. Light extraction efficiency. When a driving voltage is applied to the electrode group 35, an electric field is generated between the pole 352 and the second strip electrode 354 to dissociate the compact = 40 into electropolymerization. After that, the excited electrons and the ground state of the electric beam emit ultraviolet rays at the same time, and when the ultraviolet rays emitted by the plasma illuminate 9; 〇ITW 18719twf.doc/006 to the fluorescent material 370, the fluorescent material 37 can be excited. 〇 glow. 4A is a top view of a planar fluorescent lamp 3 ,, and FIG. 48 is a partial schematic view of a dielectric layer and an electrode structure of the present embodiment, wherein FIG. 4A is not shown in FIG. Two substrates 32 〇, discharge gas 340, fluorescent material 370 and the like. Referring to FIGS. 4A and 4B, both sides of the first strip electrode 352 have a plurality of electrode branches 352a extending toward the second strip electrode 354, respectively, and between the electrode strip 352a and the second strip electrode 354 opposite thereto. A large number of discharge regions 356 are formed due to the tip discharge of the electrode branch 352a. In order to increase the brightness and luminous efficiency of the planar fluorescent lamp 300, a dielectric branch 38A is disposed on each side of the electrode branch 352a. The dielectric branch 380 is, for example, adjacent to the patterned dielectric layer 360 ′ above the second strip electrode 354 and the dielectric branches 380 on both sides of the parent-electrode branch 352 a are parallel to each other, wherein the height of the dielectric branch 380 is less than or A thickness equal to the thickness of the patterned dielectric layer 360 is a preferred range. Further, the dielectric branch 38 can be formed, for example, by a layer mask using a screen mask. Since the dielectric branch 380 is disposed on both sides of the electrode branch 352a, the coated area of the fluorescent material 370 (such as the sidewall of the dielectric branch 38A) can be increased. The method for coating the fluorescent material 370 in the present invention may be multiple choices. For example, the phosphor material 370 can be evenly distributed on both sidewalls of each of the dielectric branches 380 to increase the coating area of the entire phosphor material 37, thereby improving the luminous efficiency. In addition, since the discharge region 356 is a portion having a higher discharge efficiency, it is possible to make each dielectric branch 13 1 6729s 〇 ITW 18719 twf. doc / 〇〇 6 38 〇 away from the side of the electrode branch 352a as compared with the adjacent side. One side of the electrode branch 352a has more phosphor material 370 to compensate for the drop in discharge efficiency, which will improve the uniformity of the overall surface light source. - The following table is a comparison of the brightness obtained when the planar fluorescent lamp of the present invention is actually operated with a conventional flat fluorescent lamp, and the dielectric branch size used in the present invention is ", double-gang", and The thickness of the light material is 70 #m. It can be seen from the following table that the overall brightness of the flat fluorescent lamp of the present invention is better than that of the conventional one.

Overall brightness 10596 nit 12393 nit 17% or more

Conventional Structure The structure of the present invention has a ratio of 12470 nit ------ 15022 nit 20.5% or more 9105 nit 10188 nit 11.9% or more except that the dielectric branch is adjacent to the patterned dielectric layer on the opposite side of the electrode branch as in the above embodiment. In addition, the present invention implements (iv) the dielectric branch, for example, may be adjacent to the patterned dielectric layer on the same side as the electrode branch (ie, above the first strip electrode), or at any suitable location where the electrode branches are off. Further, in addition to the parallel arrangement of the dielectric branches on both sides of the electrode branch, it is also possible to arrange the dielectric branch along the edge of the discharge region for better luminous efficiency. The figure is a top view of another planar fluorescent lamp of the present invention, and FIG. 5B is a partial schematic view of the dielectric layer and the electrode structure of the present embodiment, wherein in order to make the display more/monthly, the objects 5A and 5B are only painted. Show the partial components, the complete structure, please refer to phase 3 and its phase _ text. In this embodiment, the dielectric blade 580 / σ is disposed between the electrode branch 552a and the second strip electrode 11 I3167298 〇itw 18719 twf. doc / 006 electrical region 556, wherein the dielectric branch 580 is also smaller than the pattern The thickness of the dielectric layer 560 is a preferred range. It can also be fabricated by laminate printing using a screen. Since the dielectric branch 580 of the present embodiment is disposed along the edge of the discharge region 556, the discharge region 556 can be effectively utilized such that the dielectric branch 580 is adjacent to the fluorescent material on the sidewall of the discharge region 556 (not shown). Rechargeable = reaction, which increases the brightness of the light. In addition, this embodiment can also be

The coating amount of the phosphor material on both side walls of the dielectric branch 580 is changed to adjust the light effect, which will not be described herein. In addition to the above embodiments, the present invention can further improve the luminous efficiency of the planar fluorescent lamp. Referring to the above embodiment, since the wire is driven to generate a shape electrode between the first strip electrode and the second strip electrode, the main light emitting region of the planar fluorescent lamp is located between the first strip electrodes. between. In other words, the spacers are adjacent to the strips. In order to get to the electric field, ride to form a darker area

The structure is carried out; the force = clearly visible to the patterned dielectric layer ^ = fluorescent_brightness. The following is a description of Weng. Partially showing another embodiment - the difference between the dielectric layer and the electrode structure of the second embodiment: 7 Ϊ Φ8 respectively 5 shows the dielectric layer and the electrode structure in the plane of the fluorescent lamp: 'The method of the dragon is based on Fig. 4 Α and 4 Β The plots are changed based on Fig. 4A, 4BJ:f, so Figures 6-8 use component descriptions _ aforementioned; like = re=phase: 12 13 1 672S〇ITW 187l9twf.doc/006 L household ^ Example dielectric The layer and electrode structures are formed on the patterned dielectric layer in addition to the multi-H knives 380 on the side of the patterned dielectric layer above the second strip (Fig. 4A), for example, forming a majority on the patterned dielectric layer = __ 362, for example, facing the first The electrode branches 352a' on the strip electrode are located between adjacent dielectric branches. Since the patterned dielectric layer has a recess 362, the embodiment can be as shown. 1 shows = recess 362 coated glory material 370 to increase glory material

The coating area is further improved by the overall luminous efficiency of the ten-plane fluorescent lamp. In addition, when a discharge is performed between the electrode branch 352a and the second strip electrode 354 opposite thereto, the generated electric field may affect the non-luminescence between the spacer 330 and the adjacent second strip electrode 354 via the recess. The region may thus also be coated with a phosphor material 37G ' on a region between the spacer 33 〇 and the patterned dielectric layer 36 上方 above the adjacent second strip electrode 354 as shown in FIG. 8 or The phosphor material 370 that has been previously applied to this location will be illuminated by the action of free plasma. In other words, the design of the recess 362 on the patterned dielectric layer 360 by the present embodiment is not only

Increasing the coating area of the fluorescent material 370 can also cause the area where the original light is not emitted to emit light by the electric field, thereby further improving the luminous efficiency of the planar fluorescent product. And the application of the above planar fluorescent lamp, the present invention further proposes a liquid crystal display. Figure 9 is a schematic view of a liquid crystal display of the present invention, wherein the liquid crystal display 900 mainly comprises a liquid crystal panel 91A and a planar fluorescent lamp 92A. In this embodiment, the planar fluorescent lamp 920 may be the above-mentioned various types of planar fluorescent lamps proposed by the present invention, and the liquid crystal panel 91 is configured with 13 18719 twf.doc/006 above the planar fluorescent lamp 920. The surface light source provided by the flat fluorescent lamp 92 is used as a display light source. In summary, the planar fluorescent lamp and the liquid crystal display of the present invention form a plurality of dielectric branches around the electrode branches, and increase the luminous efficiency of the planar fluorescent lamp by increasing the coating area of the fluorescent material to improve the liquid crystal. The display brightness of the display. In addition, the present invention can adjust the distribution position of the luminescent material by the dielectric branch, compensate for the difference in discharge efficiency of the different regions (4), and improve the uniformity of the overall surface light source, and make the liquid crystal display ϋ have a better display effect. The present invention has been disclosed in the above preferred embodiments, but it is not intended to be used by those skilled in the art, and may be modified and retouched without departing from the spirit and scope of the invention. Therefore, the companion of the present invention: the scope of the application of the patent application is defined as the standard of the U, the thin section of the figure [simplified description of the drawing] The figure is a partial cross-sectional view of the S-shaped flat fluorescent lamp. 2 is a top view of the planar fluorescent lamp of FIG. 1. Wei Wei is a preferred embodiment of the invention - a part of a flat lamp. Figure 4A is a top view of the planar glory lamp of Figure 3. A partial schematic representation of the dielectric layer and electrode structure.円^ U Another top view of a flat fluorescent lamp. =4 Picture 2? Electrical layer and electrode junction _ partial schematic ^ dielectric layer and electrode structure of the embodiment 14 13 1 672? 98 〇 ITW 18719twf.doc / 006 Figures 7 and 8 respectively illustrate the dielectric layer and electrode structure of Figure 6 Sectional view of different locations. Figure 9 is a schematic view of a liquid crystal display of the present invention. [Main component symbol description] 100: Flat fluorescent lamp 110: Lower substrate 120: Upper substrate

130: spacer 132: discharge space 140: discharge gas 150: electrode group 152: first strip electrode 152a: electrode branch 154: second strip electrode 15 6 . discharge region 160: dielectric layer 170: fluorescent material 300 : planar fluorescent lamp 310 : first substrate 312 : reflective layer 320 : second substrate 330 : spacer 332 : discharge space 340 : discharge gas 15 13 1 672980ITW 18719twf.doc / 006 350 : electrode group 352a : electrode branch 352 : First strip electrode 354: second strip electrode 3 5 6 : discharge region 360 : patterned dielectric layer 370 : fluorescent material 380 : dielectric branch 552a : electrode branch 554 : second strip electrode 5 5 6 : Discharge region 560: patterned dielectric layer 580: dielectric branch 900: liquid crystal display 910: liquid crystal panel 920: flat fluorescent lamp 13 1 672980ITW 18719twf.doc/006

16

Claims (1)

13 1 6729801^ 18719ΐχνΜ〇〇/006 X. Patent application scope: 1. A flat fluorescent lamp comprising: • a first substrate; • a plurality of electrode groups disposed on the first substrate, wherein each electrode group is at least And a second strip electrode, and a side edge of the strip electrode has a plurality of electrode branches extending toward the second strip; a patterned dielectric layer, configured On the first substrate, and covering the climbing electrode group; the second electric circuit W branch is disposed on the first substrate and located around the pole branch; a first substrate, and the first substrate a plurality of spacers are connected to the first substrate and the second substrate to form a plurality of discharge spaces between the substrate and the second substrate, wherein the electrode groups are respectively located in the discharge spaces; The light material and a discharge gas are disposed in the discharge spaces. The flat fluorescent lamp of claim 1, wherein the dielectric branch is adjacent to the pattern above the first strip electrodes, such as the patent application scope 1 The planar fluorescent lamp of claim 1, wherein the electrical branch is adjacent to the patterned dielectric-2 above the second strip electrodes, such as the planar fluorescent lamp of claim 1, wherein each The dielectric branches on both sides of the knives are parallel to each other. 5. The flat fluorescent lamp of claim 1, wherein the electrode branches on each of the strip electrodes are opposite to the second strip electrode opposite thereto. A plurality of discharge regions are formed, and the dielectric branches are disposed along the edges of the lightning protection regions. The planar fluorescent lamp of claim 1, wherein a portion of the fluorescent material is distributed on both side walls of each dielectric branch. 7. The flat fluorescent lamp of claim 6, wherein a side of each of the dielectric branches away from the electrode branch has more phosphor material than a side adjacent to the electrode branch. 8. The planar fluorescent lamp of claim 1, wherein the patterned dielectric layer above each of the second strip electrodes has a plurality of depressions. 9. The planar fluorescent lamp of claim 8, wherein the recesses in each of the discharge spaces are opposite to the electrode branches, and each recess is located between adjacent dielectric branches. 10. The planar fluorescent lamp of claim 8, wherein a portion of the fluorescent material is distributed in the recesses, and the patterned dielectric layer above each second strip electrode is adjacent to the adjacent Between the gaps. 11. The planar fluorescent lamp of claim 2, further comprising a reflective layer disposed on the first substrate and located under the electrode groups. 12. A liquid crystal display comprising: a liquid crystal panel; a planar fluorescent lamp disposed under the liquid crystal panel for providing a backlight for display of the liquid crystal panel, the planar fluorescent lamp comprising: 18 13167259 δ 〇 ITW 18719 twf .doc/006 a first substrate; a plurality of electrode groups disposed on the substrate, wherein each electrode group includes at least a first strip electrode and a second strip electrode parallel to each other, and the first strip a side edge of the electrode has a plurality of electrode branches extending toward the first strip electrode; a patterned dielectric layer disposed on the first substrate and covering the electrode groups; a plurality of dielectric branches are disposed in the first a substrate is disposed around the electrode branches; a second substrate is disposed opposite the first substrate; and a plurality of spacers are disposed on the first substrate and the second substrate to be on the first substrate and the Forming a plurality of discharge regions between the second substrates, wherein the electrode groups are respectively located in the discharge regions; and a phosphor material and a discharge gas are disposed in the discharge regions . The liquid crystal display of claim 12, wherein the electric branch is secreted by the patterned dielectric layer above the strip-shaped f-pole. The liquid crystal display of claim 12, wherein the electric branch is adjacent to the liquid crystal display according to the second aspect of the second strip electrode, as described in claim i2, - Electrode branches two - These dielectric branches are parallel to each other. - 19 The liquid crystal display of claim 2, wherein between the electrode branches on each of the first strip electrodes and the third strip electrode opposite thereto, A plurality of discharge regions are formed, and the dielectric branches are disposed along the edge of the gate region. The liquid crystal display of claim 12, wherein a portion of the phosphor material is distributed on both side walls of each dielectric branch. In the liquid crystal display of claim 17, the side of the mother-dielectric branch away from the electrode branch has more fluorescent material than the side adjacent to the eight-branch. A liquid crystal display according to claim 12, wherein the mother-second recording electrode is over the dielectric layer, and the liquid crystal display is as described in claim 19, the mother-to-discharge There are some recesses in the space, and some of the electrodes are located between the adjacent two dielectric branches. ΐ, and the mother-one 21. The fluorescent material as part of the 19th article of the patent application is distributed in the depressions. And a strip of electricity between the patterned dielectric layer and the adjacent spacers in the upper portion of the device. The liquid=face glory according to claim 12 further includes a reflective layer. It is disposed in the first:: board; and is located below the electrode groups.