KR20080034533A - Driving method for electronic paper display panel and electronic paper display panel of using method therof - Google Patents

Abstract

A driving method for an electronic paper display panel, and the electronic paper display panel using the same are provided to apply data voltage while applying scan voltage to a scan electrode, and to apply reset voltage to a data electrode while applying the reset voltage to the scan electrode so as to remove adherence of charged particles and reduce power consumption. An electronic paper display panel includes front and rear substrates, and cells. Scan voltage is applied to a scan electrode during the scanning. Reset voltage is applied to at least one section. Data voltage is applied while applying the scan voltage to the scan electrode, and the reset voltage is applied to the data electrode while applying the reset voltage to the scan electrode. The reset voltage is alternated with + and - voltages. The adherence of charged particles is reduced and power consumption is also dropped.

Description

Driving method of electronic paper display panel and electronic paper display panel using same {{DRIVING METHOD FOR ELECTRONIC PAPER DISPLAY PANEL AND ELECTRONIC PAPER DISPLAY PANEL OF USING METHOD THEROF}

1 is a cross-sectional view schematically showing an electronic paper display device using a conventional electronic ink (Electronic Ink),

(A) to (c) is a view showing the configuration and principle of the electronic paper panel,

3 is a diagram illustrating a connection configuration of an electronic paper display panel and an external circuit for driving the same;

4 is a view illustrating a driving waveform of a conventional electronic paper display panel;

5 is a diagram illustrating a driving waveform of the electronic paper display panel according to the present invention.

The present invention relates to a method for driving an electronic paper display panel, and more particularly, to provide a driving method that can realize a high-quality display panel with low power and low product cost by preventing adhesion of charged particles of a large-sized display panel. For the purpose of

In general, digital paper displays are spotlighted as next-generation display devices following liquid crystal displays, plasma display panels, and organic luminescence devices. It is evaluated as an ideal ideal device as a display device.

In particular, electronic paper is a flexible substrate, such as a thin plastic with millions of beads scattered in an oil hole, and a display element that can display characters or images, which can be reproduced and used millions of times in the future. It is expected to be a material to replace existing print media such as newspapers, newspapers and magazines.

In addition, electronic paper is much cheaper to produce than conventional flat display panels, and does not require background lighting or continuous recharging like still screens, so it can be driven with very little energy, leading to energy efficiency. In addition, the electronic paper is very clear, has a wide viewing angle, and even has a memory function that does not completely disappear even if there is no power source, so it can be widely used in public bulletin boards, advertisements, and e-books.

Such an electronic paper display device is divided into an electrophoretic type, a xylic type, and a toner type according to its structure, and an electronic paper display using an electrophoretic type of electronic ink (hereinafter referred to as 'E-Ink'). The device is used habitually.

1 is a schematic cross-sectional view of an electronic paper display device using a conventional electronic ink.

Referring to FIG. 1, in the electronic paper display device using the electronic ink, the front substrate 10 and the rear substrate 14 are installed in parallel at a predetermined distance. The front and rear substrates 10 and 14 may be formed of any one of plastic or glass. The front transparent electrode pairs 12a and 12b are formed side by side on the rear surface of the front substrate 10. The rear transparent electrode pairs 16a and 16b are formed in parallel on the front surface of the rear substrate 14 so as to correspond to the front transparent electrode pairs 12a and 12b. The transparent electrode pairs are supplied with a controlled polarity control signal of an external driver.

Between the transparent electrode pairs 12a, 12b, 16a, and 16b, a film in which organic capsules 18a and 18b having a diameter of about 150 μm or more and 200 μm or less is uniformly dispersed is formed. Black and white pigments composed of particles having a diameter of 0.5 µm or more and 1 µm or less are dispersed in the suspension in the organic capsules 18a and 18b.

Looking at the operation method of the electronic paper display device having such a structure, first, when the negative electric field is applied to the transparent electrode, the white particles 20a, which are (+) charged particles, are the upper surface of the capsule 18a, that is, the user can see. Is moved in the direction. At this point, the white color is displayed on the surface where white particles are moved. At the same time, the opposite positive electric field attracts the black particles 20b, which are negatively charged particles, to the lower surface of the hidden capsule 18a. When the process is reversed, black particles appear on the top of the capsule causing black to appear at the marking points on the surface.

Basic principles of the electronic paper panel expressing the screen using the coulomb force will be described below.

When two or more kinds of particles having different colors and charging characteristics are inserted between two substrates, and an electric field is applied to the electrodes displayed along the substrate, particles having the corresponding charging characteristics move to express a screen.

2 (a) to 2 (c) are views showing the structure and principle of the electronic paper panel.

In FIG. 1, the electronic paper panel includes an upper glass, a lower glass, an upper electrode, a lower electrode, (+) charged particles, (−) charged particles, and a partition wall.

As shown in FIG. 1 (a), the particles 22a charged with (+) and the particles 22b charged with (-) are disposed between the upper glass 10 and the lower glass 14, respectively. Indicates. Here, when a negative voltage is applied to the upper electrode 12 and a positive voltage is applied to the lower electrode 16, the particles 22a charged with (+) to the coulomb force as shown in (b) of FIG. 1. Is moved to the upper glass 10, and the negatively charged particles 22b are moved to the lower glass 14. Naturally, at this time, the color of the particles 22a charged with (+) is displayed on the screen and is visible to the user.

In the next step, when a positive voltage is applied to the upper electrode 12 and a negative voltage to the lower electrode 16, the particles 22b charged with (-) by the coulomb force as shown in FIG. The particles 22a charged to the upper glass 10 and positively charged are moved to the lower glass 14.

At this time, the color of the particles 22b charged with (-) is displayed on the screen and is visible to the user.

As such, by changing the polarities of the voltages applied to the upper and lower electrodes, an image of a specific pixel can be expressed. Here, depending on what color is applied to the particles charged with (+) and the particles charged with (-), black and white and color can be realized at will.

The advantage of this driving method is that the response speed of the image is fast and the memory effect is maintained so that the current screen is maintained without applying power. In addition, an extra alignment layer or the like is unnecessary, so that the structure is simple, and a large screen can be realized at low cost.

3 is a diagram illustrating a connection configuration of an electronic paper display panel and an external circuit for driving the same.

As shown in Fig. 3, a scan signal and a data signal are used to implement an image of a specific pixel, and the scan signal gives a signal to write data on a specific line, and the data signal is actually applied to a specific pixel on this specific line. Will give you data. In addition, a control unit for controlling such a signal sequence is required.

In this circuit configuration, the actual screen display is repeated in FIGS. 1A to 1C, but display becomes impossible after a certain time when the phenomenon that the particles adhere to the display unit appears. In order to solve this problem, an alternating voltage is used. That is, an alternating voltage is applied before the screen is implemented to eliminate particles from sticking to the display unit.

4 illustrates a driving waveform of a conventional electronic paper display panel. As shown in FIG. 4, the reset voltage consisting of the alternating voltages is applied in the blanking period of the horizontal sync signal Hsync of the screen. The conventional electronic paper display device is composed of a screen of about 10 inches, but if the screen of the electronic paper display device is enlarged, such a conventional alternating voltage method does not effectively eliminate the phenomenon of particles sticking.

That is, as the screen becomes larger, the resistance and capacitor components of the panel also become larger, so that only the reset voltage composed of alternating voltages applied to the blanking section of the horizontal sync signal (Hsync) can sufficiently prevent particle sticking. As a result, the image quality deteriorates, and if a device such as a FET having a large current capacity is used, the product cost increases and power consumption increases.

The technical problem to be solved by the present invention for solving the above problems is to provide a method for driving the panel without expensive driving elements and high power consumption by preventing the sticking of the charged particles due to the enlargement of the panel, and further, The purpose of the present invention is to provide a driving method that can realize high image quality while lowering the product cost of the electronic paper display panel and significantly reducing power consumption.

A driving method of an electronic paper display panel according to the present invention is characterized in that the scanning method of the electronic paper display device is divided into a plurality of cells between the front substrate, the rear substrate and the front substrate and the rear substrate on which the transparent electrode is formed. Applying a scan voltage to the scan electrodes during the period, and applying a reset voltage to at least one partial section; And applying a reset voltage to the data electrode while applying a reset voltage to the data electrode while applying a reset voltage to the scan electrode.

Here, it is preferable to use the reset voltage applied to the scan electrode as an alternating voltage which alternates a positive (+) and a negative (-) voltage, and it is also preferable that the alternating is alternated once.

Preferably, the reset voltage applied to the data electrode may be a positive voltage corresponding to a negative voltage from the reset voltage applied to the scan electrode.

The second aspect of the present invention is characterized by an electronic paper display panel driven by the above-described method.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

5 is a diagram illustrating a driving waveform of the electronic paper display panel according to the present invention. As shown in FIG. 5, a reset voltage is applied to the scan electrode during the blanking period and at least one reset voltage is also applied to a specific frame period representing the screen, thereby effectively preventing particle sticking.

In addition, the scan voltage is applied to the scan electrode and the data voltage is applied to the data electrode to display the screen. The reset voltage is also applied to the data electrode corresponding to the reset voltage applied to the scan electrode.

Here, the reset voltage applied to the scan electrodes is applied by alternating positive and negative voltages, thereby effectively preventing particles from adhering to the electrodes attached to the upper and lower plates, thereby increasing the size of the panel even at low power. It can be driven effectively. The alternating voltage is composed of alternating pulse amounts and cathodes, and one alternating voltage is more preferable for display of image quality and dynamic screen.

The reset voltage applied to the data electrode can be easily controlled in the electronic paper display panel in which a plurality of cells are formed on the upper and lower plates with the partition wall therebetween, so as to easily attach and detach the electrodes by the coulomb force between the electrodes inside the cell and the particles. Various driving waveforms may be applied to the present invention. However, in the present invention, it is preferable that the data electrodes correspond to a reset voltage formed of an alternating voltage applied to the scan electrode, and the data electrode has a positive pulse voltage. It is also preferable that the positive pulse voltage of the reset voltage applied to the data electrode is applied in correspondence with the negative voltage of the reset voltage applied to the scan electrode.

As such, an alternating voltage is applied to prevent particles from sticking to the electronic paper display device, and is generally applied to a blanking section of a horizontal synchronization signal (Hsync). Hereinafter, the present invention is compared with a conventional driving method. The configuration and operation of the will be described.

The driving waveform of the conventional electronic paper display panel shown in FIG. 4 represents waveforms of actual scan lines and data lines, and the waveform shown in FIG. 4A shows a reset voltage (alternate voltage) that prevents particle sticking. And a scan voltage representing the actual scan line.

As shown in (b) of FIG. 3, the conventional driving waveform is composed of a reset voltage (alternating voltage) that prevents particle sticking once and a data voltage representing gray on an actual pixel. The reset voltage is applied to the blanking section of the horizontal synchronization signal (Hsync) and adjusts the particle sticking phenomenon by adjusting the width or amplitude of the reset voltage.

However, when the electronic paper display panel is enlarged, the resistance and capacitance components inherent in the panel become large, so that only the alternating voltage of the reset voltage applied during the blanking period of the horizontal synchronization signal detaches a large number of charged particles fixed to each cell. There is a limit that current is not supplied sufficiently.

In addition, in order to solve such a problem, in order to supply sufficient current, a circuit including an alternating voltage should use an element such as a FET having a large current capacity. As the price increases and the current increases, the power consumption of the driving unit increases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and by applying the drive waveform proposed in the present invention without replacing the device of the driving circuit with an expensive device having a high unit cost, it is possible to effectively prevent the particle sticking phenomenon and increase the size. It is an object of the present invention to provide a method of driving an electronic paper display panel which can reduce a high-quality screen and power consumption.

That is, the method proposed in the present invention, as shown in Figure 5, shows the waveform of the scan line and the data line, and the waveform shown in Figure 5 (a) is a reset voltage (alternating voltage), which prevents the adhesion of particles, In addition, a scan voltage representing an actual scan line is applied. The reset voltage is applied to the alternating voltage of at least one reset voltage during a specific frame period for displaying a screen in addition to the blanking period of the horizontal synchronization signal Hsync.

And it consists of data voltage expressing gradation in actual pixel, where horizontal sync signal (Hsync) section means scan section, and data signal enters together at this time to compose frame period of one screen. .

That is, once the reset voltage is applied in the blanking period to represent the first line, and the first scan voltage is applied in the frame period displaying the screen, the data voltage is simultaneously applied to the pixels on the first line during this time. do.

After that, the second reset voltage is applied. During this time, neither the scan voltage nor the data voltage is applied. The second reset voltage is applied and the scan voltage is applied to the corresponding line again. During this time, the data voltage is simultaneously applied to the pixels in the corresponding line. As such, multiple reset voltages are simultaneously applied to the scan electrode and the data electrode, thereby preventing particle sticking occurring in the large electronic paper display device, thereby realizing a low power and high quality screen without expensive driving circuit elements. It is possible to provide a method of driving a paper display panel.

In the present invention as described above has been described by the specific embodiments, such as specific components and limited embodiments and drawings, but this is provided to help a more general understanding of the present invention, the present invention is not limited to the above embodiments. For those skilled in the art, various modifications and variations are possible from these descriptions.

Therefore, the spirit of the present invention should not be limited to the described embodiments, and all the things that are equivalent to or equivalent to the scope of the claims as well as the claims to be described later belong to the scope of the present invention. will be.

As described above, when the electronic paper display panel driving method is provided, it is possible to drive the panel without expensive driving devices and high power consumption by preventing the charging particles from sticking due to the large size of the panel.

In addition, it is possible to provide a driving method capable of realizing high image quality while lowering the product cost of a large electronic paper display panel and significantly reducing power consumption.

Claims (5)

In the driving method of the electronic paper display device which is divided into a plurality of cells between the front substrate, the rear substrate and the front substrate and the back substrate each having a transparent electrode, Applying a scan voltage to the scan electrodes during the scan period and applying a reset voltage to at least one partial section; And applying a reset voltage to the data electrode while the scan voltage is applied to the scan electrode while the data voltage having the opposite polarity is applied to the scan electrode and the reset voltage is applied to the scan electrode. A method of driving an electronic paper display panel. The method of claim 1, And a reset voltage applied to the scan electrode as an alternating voltage that alternates a positive (+) voltage and a negative (−) voltage. The method of claim 2, And said alternating alternates once. The method of claim 2, The reset voltage applied to the data electrode is applied as a positive voltage corresponding to a negative voltage from the reset voltage applied to the scan electrode. An electronic paper display panel driven by the method of claim 1.

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