KR20070076973A - Orgarnic light emitting diodes and driving method there of - Google Patents

Abstract

An organic light emitting diode and a driving method thereof are provided to reduce a memory capacity required for realizing a screen saver function by using an index for discriminating an icon from a main image. An organic light emitting diode includes an interface(201), a memory(202), a memory controller(203), a screen saver(204), a timing controller(205), and an organic light emitting panel(206). The interface receives image data from the outside and converts the image data into data for the OLED(Organic Light Emitting Diode). The memory stores the data from the interface. The memory controller controls a memory block. The screen saver performs a screen saving function, when the OLED enters a standby mode. The data, which is stored in the memory, is processed in the screen saver and a final image is displayed on a screen.

Description

Organic Light Emitting Diodes and Driving Method there of}

1A illustrates a screen saving method and a memory of a conventional organic electroluminescent device.

Figure 1b is a view showing the structure of a conventional screensaver.

2 shows an example of an organic electroluminescent device of the invention.

3 is a view showing an example of a screen saving method of the organic electroluminescent device of the present invention.

4 is a view showing the structure of the screen saver in the embodiment of the present invention of FIG.

5 is a view for comparing an example in which the screen saving method of the present invention is effectively implemented.

***** Explanation of symbols for main parts of drawing *****

201: interface 202: memory

203: memory controller 204: screensaver

205: timing controller 206: organic electroluminescent panel

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to screen saver generation, and more particularly, to an effective hardware implementation method of a screen saver in an organic electroluminescent device that is spotlighted in a handset.

Organic Light Emitting Diodes are 'self-emitting organic materials' that emit light by using electroluminescence which emits light when electric current flows through a fluorescent organic compound. The organic EL device can be driven at a low voltage and can be made thin. In addition, it is a display candidate that is in the spotlight because it can solve the defects that are pointed out as problems in liquid crystal display (LCD) such as wide viewing angle and fast response speed.

In addition, the organic electroluminescent device has been attracting attention as a next-generation flat panel display because it can have a picture quality equal to or higher than that of a TFT LCD at a medium size or lower than other displays, and is advantageous in price competition due to its simple manufacturing process.

The organic EL device may be divided into a PM (Passive Matrix) and an AM (Active Matrix) according to the structure, and the development of an AM structure is in full swing for large area high resolution.

In addition, such organic electroluminescent devices are mainly used for the display of small devices such as handsets, car audio, and digital cameras.

As described above, in the organic electroluminescent device that is in the spotlight of the handset, the screen saver can be used to solve the problem of shortening the lifespan of the device when a certain area of the device continuously displays bright colors due to the characteristics of the organic light emitting device. This will be described below with reference to FIGS. 1A and 1B.

FIG. 1A illustrates a screen saving method and a memory of a conventional organic EL device.

1B is a view showing the structure of a conventional screen saver.

First, as shown in FIG. 1A, the existing screen saver method divides the entire screen into three areas and performs the screen saver separately. In more detail, as shown in FIG. 1, screen saving is performed considering that the entire screen is divided into three areas (window1, 2, 3), that is, an icon area above and below and a main image area in the middle.

The screen saver is performed in this manner. The structure of the screen saver is as shown in FIG. 1B. That is, when main image data and icon data are input from the outside, the main image data is stored in the frame memory 101, and the icon image data is stored in the icon memory 102.

Thereafter, in the screen saver 103 block, the icon areas windows1 and 3 of the upper and lower parts of FIG. 1A read data from both the frame memory and the icon memory, and generate final output data according to control signals in the screen saver. In order to control two memories at the same time, a memory controller that controls the memory must exist for each of the memories, which causes a problem of increasing hardware burden.

In addition, the hardware burden of the screen saver 103 block is also increased, and as a result, the cost of the overall driver IC is increased.

As described above, when performing the screen saver by dividing the icon from the main image, if the memory area for storing the icon is set aside, the capacity of the memory increases.

That is, for example, when the display screen size is QVGA (240 * 320) as shown in FIG. 1A, the basic frame memory 101 needs 240 * 320 * 18 (RGB) bits, and the memory for storing the icon is 240 * (W1). + W3) * 18 (RGB) bits are required. Here, W1 and W3 mean the number of window1,3 lines, and the number of lines may be included from 40 lines up to 80 lines as an example.

That is, it can be seen that the icon memory needs a size corresponding to 25% to 50% of the basic frame memory size. This, in turn, increases the memory size from 1.25x to 1.5x overall, adding a significant hardware burden.

In addition, the considerably high proportion of memory in driver ICs results in a significant increase in overall driver IC hardware costs. In addition, as the memory increases, the power consumed by the memory also increases, which is disadvantageous in terms of reducing handset power consumption.

In order to solve such a problem, an object of the present invention is to provide an organic EL device and a driving method thereof capable of reducing hardware burden.

In addition, another object of the present invention is to provide an organic electroluminescent device and a method of driving the same that can effectively implement a screen saver method.

In addition, another object of the present invention is to provide an organic electroluminescent device and a driving method thereof capable of saving power by reducing memory capacity.

The technical problem of the present invention is not limited to the above-mentioned thing, and another technical problem to be achieved by the present invention will be clearly understood by those skilled in the art by the effect of the configuration of the present invention.

The organic electroluminescent device according to the present invention for achieving the above object includes an organic electroluminescent panel and an index unit for determining the type of data input from the outside to the organic electroluminescent panel, according to the information output by the index unit And a driving unit configured to screen save the data.

The data may be one of main image data and icon data.

In addition, the capacity of the index portion is characterized in that 1 bit (bit).

The memory unit for storing the main image data and the icon data may be integrated into one.

In addition, the screen saving method is one of auto color inversion, auto color scroll, auto fade in / out and rainbow scroll. It is done.

The organic electroluminescent device driving method according to the present invention for achieving the above object is to determine the type of data input to the organic electroluminescent panel from the outside and the data in accordance with the information output in the indexing step Screen saving.

The data may be one of main image data and icon data.

In addition, the capacity of the index unit for determining the type of the data in the indexing step is characterized in that 1 bit (bit).

The memory unit for storing the main image data and the icon data may be integrated into one.

In addition, the screen saving method is one of auto color inversion, auto color scroll, auto fade in / out and rainbow scroll. It is done.

Hereinafter, with reference to the accompanying drawings will be described in more detail the configuration of the plasma display panel according to the present invention.

2 is a view showing an example of the organic electroluminescent device of the present invention.

As shown in FIG. 2, the organic EL device includes an interface 201, a memory 202, a memory controller 203, a screen saver 204, a driver including a timing controller 205, and a glass EL panel. 206).

The interface 201 receives image data from the outside and converts the image data into data corresponding to the organic EL device and outputs the data.

The memory 202 stores data output from the interface 201.

The memory controller 203 controls the memory 202 block.

The screen saver 204 block performs the screen saving function when the screen enters the standby mode in which the screen does not change normally. That is, the data stored in the memory 202 is operated in the screen saver 204 block to display the final image on the screen. In detail, the screen saver 204 converts a read address to read data or performs a logic operation on the read data to obtain a final image to be displayed on the screen.

 Here, the driving unit of the present invention is characterized in that the screen saving according to the information by determining the type of data input to the organic electroluminescent panel 206 differently from the conventional, which will be described in more detail with reference to FIG. .

The timing controller 205 controls the timing of data output to the electroluminescent panel 206 to implement an image.

Hereinafter, the configuration and operation of the present invention will be more clearly described with reference to the accompanying drawings.

3 is a view showing an example of a screen saving method of the organic electroluminescent device of the present invention.

As shown in FIG. 3, the screen saver method of the present invention divides an area into an icon area and a main image area to perform a screen saver. In more detail, an index unit for distinguishing an icon from a main image may be added to effectively perform screen saving according to the information output from the index unit.

For example, screen saving may be performed by designating an icon region when the index unit is '1' and a main image region when the index unit is '0'. Here, the index unit may be executed in a structure in which 1 bit is added to the memory. That is, a memory block can be implemented by implementing only a frame memory of 19 bits in total by adding an index 1 bit in addition to 18 bits of data.

By greatly reducing the capacity of the memory for storing the main image data and the icon data, it is possible to integrate these memories in one hardware and greatly reduce the cost.

In addition, the increase in capacity of 1 bit due to the above-described index unit is only a size corresponding to 5 to 6% of the basic frame memory size. As a whole, it has a memory capacity of 1.05 times to 1.06 times, which can greatly reduce the burden on hardware.

Looking at the structure of the screen saver in performing the screen saver in this way as shown in FIG.

4 is a view showing the structure of the screen saver in the embodiment of the present invention of FIG.

As shown in Fig. 4, the screen saver structure using the frame memory to which the icon index 1 bit is added is shown. As described above, the screen saver method of the present invention stores the data including the index 1 bit in the image data (main image + icon) in the frame memory 401 as it is, and externally defines a function program (API, Application Programming Interface) defined as 19 bits instead of 18 bits. Will send the data, including the index.

The screen saver 402 block that receives the data including the index receives the 19-bit data from the frame memory 401 and generates final output data by distinguishing whether the region is the main image region or the icon region from the index 1-bit value. do.

In the exemplary embodiment of the present invention, unlike the conventional screen saver structure using the icon memory separately, since there is only one memory, the controller may be performed as one controller without separate icons and main images in the memory controller block (not shown). can do. This has the effect of reducing the hardware cost by half compared to the saber structure using the icon memory separately.

The screen saver 402 block may generate various types of screensavers other than the screensaver associated with the movement. For example, a color change screen saver can be used as a screen saver in a mobile phone display, and also when creating a mobile screen saver, the driver IC can be used without limitation.

The color change screen saver may include auto color inversion, auto color scroll, auto fade in / out, and rainbow scroll. have.

In addition, the screen saver of the present invention can be effectively implemented without changing the existing drive IC structure by screen saving by separating the icon and the main image regardless of the trend of the handset screen, as shown in FIG.

5 is a diagram for comparing an example in which the screen saving method of the present invention is effectively implemented.

FIG. 5A illustrates a structure of a handset screen in which an icon region and a main image region are separated, and FIG. 5B illustrates a structure of a handset screen in which a main image region is displayed up to an icon region.

In the screen structure of FIG. 5A, the entire screen is divided into three areas, and screen savers are separately performed. That is, the screen is divided into upper and lower icon regions Window1 and 3 and the middle main image region Window2. Even in such a structure, the method of the present invention, which separates the icon from the main image and saves the screen, may be used to effectively reduce the memory.

More preferably, it may be used in the structure of FIG. 5B. That is, as shown in Fig. 5B, the main image is displayed not only in the middle main image area (Window2) but also in the upper and lower icon areas (Window1, 3). There is a further need for a method of effectively screening by dividing the icon and the main image of the invention.

As described above, the present invention provides a screen saver for distinguishing an icon from a main image by reflecting the trend of a handset screen in an organic EL device, and provides a method of easily indexing the icon and the main image. In addition to the savings, there is the effect of enabling hardware to be implemented at low cost. As a result, cost reduction and power consumption of the driver IC of the organic light emitting diode are reduced.

In addition, this invention is not limited to the above-mentioned embodiment. In other words, if a screen saver has a configuration of an index unit for determining the type of data, and the amount of memory is to be reduced, it is considered to be included in the present invention.

As such, the technical configuration of the present invention described above can be understood by those skilled in the art that the present invention can be implemented in other specific forms without changing the technical spirit or essential features of the present invention.

Therefore, the exemplary embodiments described above are to be understood as illustrative and not restrictive in all aspects, and the scope of the present invention is indicated by the following claims rather than the detailed description, and the meaning and scope of the claims and All changes or modifications derived from the equivalent concept should be interpreted as being included in the scope of the present invention.

As described above, the organic EL device and the driving method thereof according to the present invention have the effect of reducing the capacity of the memory.

In addition, the organic EL device and its driving method of the present invention has an effect that can reduce the burden on the hardware.

In addition, the organic EL device and the driving method thereof according to the present invention have an effect of easily implementing the screen saver method according to the screen trend.

In addition, the organic EL device and its driving method of the present invention has the effect of reducing the power consumption.

Claims (10)

Organic electroluminescent panels; And And an indexing unit for determining a type of data input from the outside to the organic electroluminescent panel, and including a driving unit for screen saving the data according to the information output from the indexing unit. The method of claim 1, And the data is one of main image data and icon data. The method of claim 1, The capacity of the index portion is an organic electroluminescent device, characterized in that 1 bit. The method of claim 2, And a memory unit for storing the main image data and the icon data. The method of claim 1, The screen saving method may be one of an auto color inversion, an auto color scroll, an auto fade in / out, and a rainbow scroll. Organic electroluminescent device. In a method of driving an organic electroluminescent panel, An indexing step of determining a type of data input from the outside into the organic electroluminescent panel; And And screen-saving the data according to the information output in the indexing step. The method of claim 6, And said data is one of main image data and icon data. The method of claim 6, And a capacity of the index unit for determining the type of data in the indexing step is 1 bit. The method of claim 7, wherein And a memory unit for storing the main image data and the icon data. The method of claim 6, The screen saving method may be one of an auto color inversion, an auto color scroll, an auto fade in / out, and a rainbow scroll. A method of driving an organic electroluminescent device.

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