CN101303828B - Driving method of field emission backlight panel circuit - Google Patents

Abstract

The present invention provides a field emission backlight panel circuit driving method, which controls the emitters to emit electrons alternately by transmitting a set of driving signals with phase differences to the emitters of the field emission panel, thereby increasing the luminous area of the field emission panel and increasing its brightness and uniformity.

Description

Field emission backlight panel circuit driving method

technical field

The invention relates to a driving method, in particular to a circuit driving method suitable for a field emission backlight panel.

Background technique

In the current display technology field, lamps, such as cold cathode lamps (CCFL), hot cathode lamps (HCFL) or light-emitting diodes (LEDs) are generally used as backlight sources. However, in terms of panel technology improvement and manufacturing area Under the expanded technological breakthrough, the development of large displays is an inevitable trend. Also, for large-scale displays, if the light tube is used as the backlight source, there may be concerns about weak structure or mercury pollution. However, if point light sources such as light-emitting diodes are used as the backlight source, it may not be easy to spread evenly. Due to the doubts of forming a surface light source, many optical films are required to provide a uniform surface light source. Therefore, a technology of using a field emission panel with a strong structure and uniform light emission as a backlight source has been developed at present.

The luminescence principle of the field emission panel is mainly to use the gate to apply a high electric field to control the emission of the electron source on the cathode plate, and the emitted electrons are attracted by the voltage on the anode plate and are accelerated to the anode plate to bombard the coating on the anode plate. Fluorescent substances, so that the fluorescent substances absorb part of the energy carried by the electrons to excite the fluorescent substances to emit light.

However, in the known technology, the gate of the field emission panel and the voltage of the electron emitter need to be driven together, which complicates the driving method, and the electron emitter and the gate need to be fabricated separately, which increases the difficulty of manufacturing the field emission panel and reduces its cost. Luminous area.

Contents of the invention

An object of the present invention is to provide a circuit driving method for a field emission backlight panel, which can increase the light emitting area of the field emission backlight panel.

Another object of the present invention is to provide a field emission backlight panel circuit driving method, which can increase the brightness and uniformity of the field emission backlight panel.

Another object of the present invention is to provide a circuit driving method for a field emission backlight panel, which can save manufacturing cost.

In order to achieve the above object, the present invention provides a field emission backlight panel circuit driving method, which is suitable for a field emission backlight panel, on which a plurality of emitters are formed, and the emitters are divided into complex groups. The above-mentioned driving method includes the following steps: generating A frequency signal; generating a plurality of driving signals according to the frequency signal; converting the voltage of the driving signal; and inputting the converted voltage of the driving signal into the group of emitter backlight panels respectively.

The above-mentioned field emission backlight panel may include various types of field emission panels, but it is preferably a field emission panel including an anode plate, a cathode plate and at least one spacer, and more preferably a plurality of emitters are arranged on the cathode plate Multiple launch groups for . The structure of the above-mentioned anode plate and cathode plate is not limited, but it is preferably a flat plate, and the anode plate is more preferably a flat plate comprising a fluorescent substance. The material for making the spacer is unlimited, and it can be glass or polyamide (Polyimide) Or other materials resistant to vacuum or high pressure.

The manufacturing method of the above-mentioned emitter is not limited, but it is preferably made by laminating an electron source material and a conductive material, and is more preferably made by using a mixture of an electron source material and a conductive material. Secondly, the above-mentioned emitter The shape is also not limited, but it is preferably long. The above-mentioned electron source material can be any material with low work function, such as silicon, metal or carbon-based material, and is preferably polysilicon, molybdenum, niobium, tungsten, diamond thin film or carbon nanotube.

The above-mentioned driving signal can be input to the field emission backlight panel through a scanning driving unit to control the voltage of the emitter, but before it is input to the field emission backlight panel, it can first pass through a voltage electrically connected between the scanning driving unit and the field emission backlight panel The conversion unit converts the voltage of the driving signal, and the voltage conversion unit preferably boosts the driving signal. Therefore, when the voltage of the emitter controlled by the drive signal is a high voltage, the emitter acts as a gate so that the emitter adjacent to the emitter controlled by the drive signal to a low voltage is attracted by its electric field to emit at least one electron, However, it is preferable to control the voltage of adjacent emitters to alternately switch potentials between high and low voltages to alternately emit electrons at successive different time points.

Secondly, the number of the above-mentioned driving signals is not limited, but it is preferably two, and more preferably a pair of odd and even driving signals respectively corresponding to an odd-numbered row of emitters and an even-numbered row of emitters. Then, the electronic characteristics of the above-mentioned driving signal are not limited, but its period is preferably an integer multiple of the period of the frequency signal, and more preferably twice. Also, the electronic characteristics of the above-mentioned drive signals are infinitely correlated, however, they are preferably different in phase, and more preferably have the same frequency or cycle. In addition, the waveform of the above driving signal is not limited, but it is preferably an electric wave with a voltage between a high reference voltage and a low reference voltage, and more preferably a square wave.

Therefore, the circuit driving method of the field emission backlight panel of the present invention transmits a group of driving signals with phase differences to the emitters of the field emission panel to control the emitters to alternately emit electrons, thereby increasing the light-emitting area of the field emission panel and increasing its brightness and uniformity.

Description of drawings

Fig. 1 is a field emission backlight panel system architecture diagram of the first preferred embodiment of the present invention;

Fig. 2 is the sectional view of the field emission panel of the first preferred embodiment of the present invention;

Fig. 3 is the flow chart of the field emission backlight panel circuit driving method of the first preferred embodiment of the present invention;

Fig. 4 is the electronic signal schematic diagram of the field emission backlight panel circuit of the first preferred embodiment of the present invention;

FIG. 5 is a cross-sectional view of a field emission panel according to another preferred embodiment of the present invention.

Explanation of main component symbols

Field emission backlight panel 1 Field emission panel 11 Scanning drive unit 12

Power supply unit 13 Voltage conversion unit 14 Anode plate 111

Cathode plate 112 Gap layer 113 Fluorescent substance 114

emitter 115 gate layer 116

Steps 310, 320, 330, 340

Detailed ways

Regarding the first preferred embodiment of the present invention, please refer to FIGS. 1-4 .

First, please refer to FIG. 1 , as shown in the figure, the field emission backlight panel 1 includes a field emission panel 11 , a scanning driving unit 12 , a power supply unit 13 and a voltage converting unit 14 . The power supply unit 13 is electrically connected to the scan driving unit 12 , and the voltage conversion unit 14 is electrically connected between the field emission panel 11 and the scan driving unit 12 .

Please also refer to FIG. 2 , which shows a cross-sectional view corresponding to line II' of the field emission panel 11 in FIG. 1 . As shown in the figure, the field emission panel 11 is mainly composed of an anode plate 111, a cathode plate 112 and a gap layer 113, wherein the space is a low-pressure state close to vacuum to prevent impurity molecules from polluting or damaging the cathode plate 112. In this implementation In the example, the air pressure is kept below 10-7torr.

The anode plate 111 of the present embodiment is a transparent conductive plate, such as: indium tin oxide (IndiumTin Oxide, ITO), and is applied a positive voltage, then, a layer of fluorescent substance 114 is formed on the anode plate 111, and the fluorescent substance 114 The composition of the phosphor can be a high-voltage fluorescent substance or a low-voltage fluorescent substance, and the difference is that the operating voltage of light emission is different. Therefore, when the fluorescent substance 114 is bombarded by electrons with energy exceeding the operating voltage, it is excited and emits light. The fluorescent substance 114 of this embodiment emits white light.

The cathode plate 112 of this embodiment is a silicon substrate on which a plurality of emitters 115 are formed, which is made of an electron source material, such as: carbon nanotubes and a conductive material, such as: a metal mixed paste, and Form its elongated appearance on the cathode plate 112 by screen printing technology. The emitters 115 of this embodiment are divided into two groups. One ends are electrically connected to each other to form another group.

The gap layer 113 of this embodiment is polyamide with good mechanical strength, no outgassing and good sealing performance, which maintains a gap between the anode plate 111 and the cathode plate 112 and maintains a low air pressure therebetween.

Next, please refer to FIG. 3 and FIG. 4 together, wherein FIG. 3 shows a flow chart of the field emission backlight panel circuit driving method of this embodiment, and FIG. 4 shows a schematic diagram of electronic signals of this embodiment.

In this embodiment, an oscillator (not shown in the figure) in the scan driving unit 12 generates a frequency signal (CLK), which is a periodic pattern of alternating cycles between a high reference voltage and a low reference voltage. wave (step 310). Afterwards, the scan drive unit 12 generates a pair of odd and even drive signals (ODD, EVEN) corresponding to each other according to the frequency signal (step 320). The odd and even drive signals of this embodiment are also at a high reference voltage and a low reference voltage The square wave of alternating voltage cycle, and the period and frequency of the odd and even driving signals are the same, only there is a phase difference between them, and the phase difference of this embodiment is 180 degrees, the high reference voltage and the low voltage of the odd and even driving signals The voltage difference of the reference voltage is about 5 volts. Then, the scan drive unit 12 outputs the odd and even drive signals to the voltage conversion unit 14 through the A and B output terminals respectively, so that the voltage conversion unit 14 will boost the odd and even drive signals so that the odd and even drive signals The voltage difference between the high reference voltage and the low reference voltage is amplified at about 200 volts (step 330 ). Afterwards, the voltage converting unit 14 inputs the boosted odd and even driving signals into the emitter 115 of the field emission panel 11 through two wires (step 340 ).

The two groups of emitters 115 in this embodiment respectively receive the odd and even drive signals, for example, the emitters 115 in odd rows receive the above-mentioned odd drive signals, and the emitters 115 in even rows receive the above-mentioned even drive signals. Because of the phase difference between the odd and even driving signals, there is a voltage difference of about 200 volts between the emitters 115 in the odd row and the emitters 115 in the even row at the same time point. When the odd drive signal is a low reference voltage and the even drive signal is a high reference voltage, the voltage on the odd row emitters 115 is the low reference voltage and the voltage on the even row emitters 115 is the high reference voltage. At this time, a strong electric field is generated between the emitters 115 of the odd row and the emitters 115 of the even row and then the emitter 115 of the odd row is sent out a plurality of electrons, that is, the emitter 115 of the odd row is used as the electron source, and the emitter 115 of the even row Body 115 acts as a gate. The electrons emitted by the emitters 115 in a single row are attracted by the positive voltage of the anode plate 111 and bombard the fluorescent substance 114 thereon, thereby exciting the fluorescent substance 114 to emit light. However, at the next point in time, when the odd drive signal is a high reference voltage and the even drive signal is a low reference voltage, the voltage on the odd row emitters 115 is the high reference voltage and the voltage on the even row emitters 115 is the low reference voltage. Voltage. At this time, the emitters 115 in the even rows are attracted by the strong electric field between them and the emitters 115 in the odd rows, and emit a plurality of electrons to make the fluorescent substance 114 bombarded by them emit light.

Therefore, the field emission backlight panel circuit driving method of this embodiment outputs a group of driving signals with phase difference to the field emission panel to drive the emitter of the field emission panel to alternately emit electrons at different time points, thus simplifying the logic of the driving signals The process and the design of the scanning drive unit save costs and increase the area, brightness and uniformity of the light emitted by the field emission panel.

Please refer to FIG. 5 , which shows a cross-sectional view of a field emission panel according to a second preferred embodiment of the present invention. To avoid redundant description, only the differences between this embodiment and the previous embodiment are described in detail here. As shown in the figure, a gate layer 116 is further formed on the emitter 115 on the cathode plate 112 of the field emission panel 11 of this embodiment, which controls whether the emitter 115 below it emits electrons with a voltage, more precisely , when the voltage of the gate layer 116 is a high voltage and the voltage difference with the emitter 115 is greater than the work function of the emitter 115, the emitter 115 emits electrons, and does not emit electrons in other cases, so that the fluorescent substance 114 can be controlled Whether to shine. Moreover, the gate layer 116 and the emitter 115 of this embodiment are all electrically connected to each other in odd numbers, electrically connected to each other in even numbers, and not electrically connected to each other in even numbers and odd numbers. However, the emitters 115 in odd rows are electrically connected to the gate layers 116 in even rows and are controlled by odd driving signals, and the emitters 115 in even rows are electrically connected to the gate layers 116 in odd rows and Receive control of even drive signal. Therefore, at a point in time, when the voltage of the gate layers 116 of the odd row is the high reference voltage and the emitters 115 below it are the low reference voltage, the emitters 115 of the odd row emit electrons. At the next point in time, when the voltage of the gate layer 116 in the double row is the high reference voltage and the emitter 115 below it is the low reference voltage, electrons are emitted from the emitter 115 in the double row.

As can be known from the above, the present invention generates a plurality of drive signals based on a frequency signal, and after converting the voltage of the drive signal, transmits the drive signal to the field emission backlight panel, so that the plurality of rows of the field emission backlight panel emits The body alternately emits electrons, thereby increasing the light-emitting area, brightness and uniformity of the field emission backlight panel, and can save manufacturing costs.

The above-mentioned embodiments are only examples for convenience of description, and the scope of rights claimed by the present invention should be based on the scope of protection of the claims, rather than limited to the above-mentioned embodiments.

Claims (14)

1. a method for driving circuit of field emission backlight panel is applicable to a field emission backlight panel, forms a plurality of emitters on it, and this emitter is to be divided into plural groups, it is characterized in that, above-mentioned driving method comprises the following steps:

Produce a frequency signal;

Produce a plurality of drive signals according to this frequency signal; Wherein, the phase place difference of these a plurality of drive signals;

Change the voltage of this drive signal; And

To import this plural groups emitter backlight panel respectively through this drive signal of changing voltage, wherein this drive signal is the electric wave of voltage between a high reference voltage and a low reference voltage.

2. method for driving circuit of field emission backlight panel as claimed in claim 1 is characterized in that, wherein, the voltage of this drive signal is to be converted to raise.

3. method for driving circuit of field emission backlight panel as claimed in claim 2 is characterized in that, wherein, this drive signal be by a voltage conversion unit with changing voltage, this voltage conversion unit is to be electrically connected at this field emission backlight panel.

4. method for driving circuit of field emission backlight panel as claimed in claim 1 is characterized in that, wherein, this drive signal is two.

5. method for driving circuit of field emission backlight panel as claimed in claim 1 is characterized in that, wherein, the cycle of this drive signal is the integral multiple in the cycle of this frequency signal.

6. method for driving circuit of field emission backlight panel as claimed in claim 1 is characterized in that, wherein, the frequency or the cycle of these a plurality of drive signals are identical.

7. method for driving circuit of field emission backlight panel as claimed in claim 1 is characterized in that, wherein, this drive signal is to import this field emission backlight panel via the one scan driver element.

8. method for driving circuit of field emission backlight panel as claimed in claim 7 is characterized in that, wherein, this scan drive cell is to be electrically connected between a power-supply unit and this field emission backlight panel.

9. method for driving circuit of field emission backlight panel as claimed in claim 1 is characterized in that, wherein, this drive signal is the voltage of a plurality of emitters of this field emission backlight panel of control.

10. method for driving circuit of field emission backlight panel as claimed in claim 9 is characterized in that, wherein, same time point, the voltage of adjacent transmission body are different.

11. method for driving circuit of field emission backlight panel as claimed in claim 9 is characterized in that, wherein, this emitter is to use the potpourri of an electron source material and a conductive material to make.

12. method for driving circuit of field emission backlight panel as claimed in claim 9 is characterized in that, wherein, this emitter is a strip.

13. method for driving circuit of field emission backlight panel as claimed in claim 9 is characterized in that, wherein, when the voltage of controlling this emitter when this drive signal was a low-voltage, this emitter sent at least one electronics.

14. method for driving circuit of field emission backlight panel as claimed in claim 13 is characterized in that, wherein, the adjacent transmission body alternately sends this electronics.

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