CN2686027Y - Field transmitting display panel feed back circuit with uniform distribution brightness - Google Patents
Field transmitting display panel feed back circuit with uniform distribution brightness Download PDFInfo
- Publication number
- CN2686027Y CN2686027Y CN 200420001892 CN200420001892U CN2686027Y CN 2686027 Y CN2686027 Y CN 2686027Y CN 200420001892 CN200420001892 CN 200420001892 CN 200420001892 U CN200420001892 U CN 200420001892U CN 2686027 Y CN2686027 Y CN 2686027Y
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- China
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- display panel
- field emission
- emission display
- feedback circuit
- feedback
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Abstract
The utility model which refers to a field transmitting display panel feed back circuit with uniform brightness distribution is used in the uniform brightness distribution of each section of the field transmitting display panel, comprising a pulse wave duration modulation device used in the transformation from direct current to alternating current, a voltage feedback circuit which is arranged between a pulse wave duration modulation device and the field transmitting display panel, and is used to feedback the voltage signal,and a current feedback circuit which is connected between the pulse wave duration modulation device and the field transmitting display panel, and is used in the feedback of current signal. Wherein, the pulse wave duration modulation device is used to adjust the alternating current level by detecting the voltage signal and the current signal. The automate current signal is generated by a stable closed circuit and input to the field transmitting display panel, and a consistent current density is gained in each section of the different light-emitting area. The uniform brightness distribution is provided to the field transmitting display panel, solving the bright spot flickering problem in the thick film production process, the service life of the panel is extended, and the quality is improved.
Description
Technical field
The utility model relates to a kind of Field Emission Display panel feedback circuit of illuminance distributionization, be particularly related to and a kind ofly utilize stable closed loop and produce the uniform alternating current of density, the brightness uniformity of Field Emission Display panel also can be increased the serviceable life of panel simultaneously.
Background technology
Present flat-panel screens technology, different with its material and processing procedure, can divide into following several mostly: cathode-ray tube (CRT) (Cathode Ray Tube), Thin Film Transistor-LCD (Thin FilmTransistor crystal display, be called for short TFT-LCD) and Field Emission Display (Filed LiquidEmission display is called for short FED).Wherein Field Emission Display makes Field Emission Display be regarded as having in future the flat-panel screens technology of competition potential owing to have multiple advantages such as fast, thin thickness of reaction time, in light weight and power saving.
So-called Field Emission Display is that a kind of electric field that utilizes makes cathode electronics emissive source (Cathodeelectron emitter) produce electronics, fluorescent powder by this electron excitation positive plate, it is luminous to make fluorescent powder produce photon, its characteristic is that big I light, thin, effectively display area size is made according to processing procedure and product demand, does not also have the visual angle problem as flat liquid crystal display in addition.
Please refer to Fig. 1, structural representation for the Field Emission Display of known two-level structure, wherein Field Emission Display 100 comprises anode 30 and negative electrode 40 at least, be provided with barrier rib (rib) 35 between anode 30 and the negative electrode 40, the interval of anode 30 and 40 vacuum areas of negative electrode is provided, and as the support between anode 30 and the negative electrode 40.And also include anode glass substrate 31, one anode conductive layers, 32, one fluorescent powder coatings 33 (phosphors layer) in the anode 30; 40 on negative electrode comprises a cathode glass substrate 41, one cathode conductive layers 42, one electron emission source layers 43 at least; Wherein anode 30 and negative electrode 40 is by barrier rib 35 configurations at interval, its function is for keeping the vacuum area between negative electrode 40 and the anode 30, and by an extra electric field that provides, the fluorescent powder coating 33 that electron emission source layer 43 on the negative electrode 40 is produced on electronics and the directive anode 30, the fluorescence excitation powder is luminous.The Field Emission Display 100 of this two-level structure, the gap of negative electrode 40 and anode 30 can be between 50 μ m to 200 μ m, needed driving electric field intensity is many need not to surpass 10V/ μ m, or driving voltage (Turn on Voltage) is greater than more than the 150V, can make negative electrode produce electronics, then decide according to this phosphor material powder characteristic of selecting for use as for the luminescence efficiency of fluorescent powder.
Because the Field Emission Display 100 of above-mentioned known technology is to be illustrated with single pixel (One Pixel), yet for monoblock Field Emission Display panel, its current density can be because of the difference of section area (Segment) difference to some extent.In other words, when light-emitting area becomes big, drive large tracts of land institute consumed current and follow and become big, cause current density to diminish relatively, make picture so the deepening that whole front panel presented.In like manner, when driving small size, also can produce the bright excessively defective of picture greatly, therefore reduce the quality and the level of panel because of current density becomes relatively; Moreover, because the current source that adds in the known technology is a direct current, cause whole front panel in the process of using, can send very high temperature, make the life-span of panel also therefore reduce.The more important thing is that direct supply also causes having on the panel problem of bright spot flicker possibly.
Via the explanation of above-mentioned known technology as can be known, the Field Emission Display panel of different area can because of current density to some extent difference cause the phenomenon of brightness disproportionation, the direct supply that adds simultaneously also will cause the overheated or all bad reactions of bright spot flicker of panel.
Summary of the invention
For improving above-mentioned defective, the utility model proposes a kind of simple and easy and solution and device cheaply, utilize stable closed loop to be designed, and the power supply that collocation exchanges is imported this Field Emission Display panel, can be with the brightness uniformity of panel, reduce simultaneously the temperature of panel and the flicker probability that bright spot takes place effectively, by this, improve the life-span and the competitive power of Field Emission Display panel.
The utility model is a kind of Field Emission Display panel feedback circuit of illuminance distributionization, can be in order to brightness uniformity with the Field Emission Display panel, mainly include: a pulse wave width modulation device, in order to changing direct current electric current to an alternating current, and detecting and the signal level that compensates at least one feedback; One voltage feedback circuit is connected between this pulse wave width modulation device and this Field Emission Display panel, in order to feedback voltage; One current feedback circuit is connected between this pulse wave width modulation device and this Field Emission Display panel, in order to the feedback electric current.By this, the picture that allows the Field Emission Display panel be presented has uniform luminosity, the utility model more can solve the problem of bright spot flicker in the thick film processing procedure because of using AC power input Field Emission Display panel simultaneously, and then improves the serviceable life and the quality of panel.
In order further to understand feature of the present utility model and technology contents, see also following about detailed description of the present utility model and accompanying drawing, right accompanying drawing only provide with reference to and explanation usefulness, be not to be used for the utility model is limited.
Description of drawings
Figure 1 shows that the structural representation of known Field Emission Display;
Figure 2 shows that main circuit block scheme of the present utility model;
Figure 3 shows that complete circuit of the present invention.
Wherein, description of reference numerals is as follows:
30 anodes, 31 anode glass substrates
32 anode conductive layers, 33 fluorescent powder coatings
35 barrier ribs, 40 negative electrodes
41 cathode glass substrate, 42 cathode conductive layers
43 electron emission source layers, 100 Field Emission Display
120 pulse wave width modulation devices, 125 holding circuits
130 amplifying circuits, 140 Field Emission Display panels
150 current feedback circuit, 160 voltage feedback circuits
170 control feedback chips
Embodiment
The utility model is a kind of Field Emission Display panel feedback circuit of illuminance distributionization, in order to the brightness uniformity with Field Emission Display picture that panel presents.At first, see also Fig. 2, shown in this Fig is main circuit block scheme of the present utility model, wherein Shu Ru voltage and electric current are represented with direct current, yet, for voltage and electric current that Field Emission Display panel 140 is obtained is AC signal, therefore must become AC signal in order to voltage and current conversion again via a pulse wave width modulation device 120 thereafter with this direct current.
The AC signal that this pulse wave width modulation device 120 is exported is sent to an amplifying circuit 130, this AC signal can be done further amplification, by this, provide the Field Emission Display panel that is connected in thereafter 140 to obtain a high-frequency ac current more than the 10000Hz (hertz) at least.Experimental data presentation, the frequency of this optimized alternating current approximately is between 12000Hz to 14000Hz, the anode or the received voltage of gate pole of Field Emission Display panel 140 approximately are at positive and negative about 300 alternating voltage at this moment, negative electrode then keeps 0 current potential (0 volt), the design of this kind interchange, the light-emitting mode that not only helps user's controlling filed emission display panel 140, more can reduce Field Emission Display panel 140 heat energy that in using, is produced and the probability that specific bright spot takes place further, therefore can improve the shortcoming of importing with direct current in the known technology.Yet in present embodiment, the alternating voltage that anode and negative electrode received of Field Emission Display panel 140 can cooperate the luminescence efficiency of Field Emission Display panel 140 and modulation is not in addition limited by present embodiment.
The prime of this amplifying circuit 130 is connected to this pulse wave width modulation device 120, therebetween form a current feedback circuit 150 by this, can be in order to the alternating current feedback and obtain a stable closed loop, wherein alternating current is fed back to after this pulse wave width modulation device 120, and this pulse wave width modulation device 120 can further be detected the signal level of the alternating current of institute's feedback.If the signal level of this feedback is lost genuine phenomenon, will have influence on the current density among this Field Emission Display panel 140, so 120 signal level that begin to compensate this feedback of pulse wave width modulation device, make Field Emission Display panel 140 thereafter obtain consistent current density, to guarantee that the picture that Field Emission Display panel 140 is presented is the brightness of homogenising.
Similarly, back level in this amplifying circuit 130 is connected to this pulse wave width modulation device 120, form a voltage feedback circuit 160, in order to the feedback alternating voltage and obtain a stable closed loop, wherein this pulse wave width modulation device 120 also can begin to compensate the alternating voltage of institute's feedback, make that the brightness of big section area is unlikely to too dark (or the brightness of away minor segment area is unlikely to too bright) in this Field Emission Display panel 140, obtain uniform picture brightness by this, drive the big or little principle that all can keep brightness uniformity of area no matter reach Field Emission Display panel 140.
Wherein this pulse wave width modulation device 120 is in the operating process of reality, consider the saving of functional integrity and cost, the application of collocation entity component can be controlled this pulse wave width modulation device 120 or compensated with integrated circuit (IC) chip, and the enhancement of its essence effect is arranged; Moreover; for in the process that prevents to use because of surging or unsettled input voltage; can in the Field Emission Display panel feedback circuit of the utility model illuminance distributionization, install a holding circuit 125 separately; the whole feedback circuit of protection is unlikely to so burns; yet the position that this holding circuit 125 is connected; be according to the deviser selected best voluntarily tie point, do not limited, in order to increase the life-span of security of the present utility model and use by present embodiment.
Please consult Fig. 3, be complete circuit of the present invention, the back level that wherein can obviously find out this amplifying circuit 130 must be via the signal level of resistance, electric capacity and diode elder generation this feedback voltage of sensing when feedback voltage, this signal level be fed back to a control feedback chip 170, in order to the modulation pulse bandwidth thereafter.Similarly, the prime of this amplifying circuit 130 is also via the signal level of resistance, electric capacity, diode and N shape field-effect transistor elder generation its feedback electric current of sensing, is fed back to this control feedback chip 170 thereafter again to control the pulse wave width modulation after the feedback.At last, by control feedback chip 170 this feedback voltage of compensation and feedback electric currents.
In sum, the Field Emission Display panel feedback circuit of illuminance distributionization of the present utility model is to import this Field Emission Display panel 140 with the signal that exchanges, make its picture that presents have uniform luminosity, solve the problem of bright spot flicker on the Field Emission Display panel 140 simultaneously, and then improve the serviceable life and the quality of panel.
The above is preferred embodiment of the present utility model only, is not to be used for the utility model is limited, and all equalizations of being done according to the utility model claim are modified and changed, and all should belong to the covering scope of the utility model patent.
Claims (11)
1. the Field Emission Display panel feedback circuit of an illuminance distributionization in order to Field Emission Display panel luminance homogenising, is characterized in that mainly including:
One in order to changing direct current electric current to an alternating current, and detecting and the pulse wave width modulation device that compensates the signal level of at least one feedback;
The one voltage feedback circuit in order to feedback one voltage signal is connected between this pulse wave width modulation device and this Field Emission Display panel;
The one current feedback circuit in order to feedback one current signal is connected between this pulse wave width modulation device and this Field Emission Display panel.
2. the Field Emission Display panel feedback circuit of illuminance distributionization as claimed in claim 1 is characterized in that also comprising in order to control an integrated circuit (IC) chip of this pulse wave width modulation device.
3. the Field Emission Display panel feedback circuit of illuminance distributionization as claimed in claim 1 is characterized in that this alternating current is between the 12000Hz to 14000Hz.
4. the Field Emission Display panel feedback circuit of illuminance distributionization as claimed in claim 1 is characterized in that the voltage that the anode of this Field Emission Display panel is imported is between positive and negative 300 volts.
5. the Field Emission Display panel feedback circuit of illuminance distributionization as claimed in claim 1, the negative electrode that it is characterized in that this Field Emission Display panel are 0 volt current potential.
6. the Field Emission Display panel feedback circuit of illuminance distributionization as claimed in claim 1 is characterized in that further comprising an amplifying circuit.
7. the Field Emission Display panel feedback circuit of illuminance distributionization as claimed in claim 6 is characterized in that the prime of this amplifying circuit is connected to this pulse wave width modulation device, forms this current feedback circuit.
8. the Field Emission Display panel feedback circuit of illuminance distributionization as claimed in claim 6 is characterized in that the back level of this amplifying circuit is connected to this pulse wave width modulation device, forms this voltage feedback circuit.
9. the Field Emission Display panel feedback circuit of illuminance distributionization as claimed in claim 1 is characterized in that this voltage feedback circuit is the accurate position of this voltage signal of feedback, forms a closed loop.
10. the Field Emission Display panel feedback circuit of illuminance distributionization as claimed in claim 1 is characterized in that this current feedback circuit is the accurate position of this current signal of feedback, forms a closed loop.
11. the Field Emission Display panel feedback circuit of illuminance distributionization as claimed in claim 1 is characterized in that further comprising a holding circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420001892 CN2686027Y (en) | 2004-01-17 | 2004-01-17 | Field transmitting display panel feed back circuit with uniform distribution brightness |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420001892 CN2686027Y (en) | 2004-01-17 | 2004-01-17 | Field transmitting display panel feed back circuit with uniform distribution brightness |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2686027Y true CN2686027Y (en) | 2005-03-16 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420001892 Expired - Fee Related CN2686027Y (en) | 2004-01-17 | 2004-01-17 | Field transmitting display panel feed back circuit with uniform distribution brightness |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2686027Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI475925B (en) * | 2011-08-11 | 2015-03-01 | Au Optronics Corp | Field emitting display panel |
-
2004
- 2004-01-17 CN CN 200420001892 patent/CN2686027Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI475925B (en) * | 2011-08-11 | 2015-03-01 | Au Optronics Corp | Field emitting display panel |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20050316 Termination date: 20100219 |