KR20050062908A - Flat display panel and image display method - Google Patents

Abstract

The present invention relates to an organic electroluminescent panel that drives an image by implementing scan lines vertically and column lines horizontally, and a method of addressing when inputting an image into a memory and writing a stored image for display. Disclosed is an image display method capable of securing sufficient duty by applying differently.

Accordingly, the present invention provides a control unit including a graphics memory for storing an input image; A panel for displaying an image; A scan driver configured at an upper portion of the panel to provide a scan signal in a vertical direction to the panel as a control signal output from the controller; And a column driver configured at one side of the panel to provide a column signal to the panel in a horizontal direction as data and control signals output from the controller, and when the controller stores the input image in the graphic memory. The first addressing is performed by matching the scanned data in the vertical direction, and the second addressing is performed by matching the data scanned in the horizontal direction in the vertical direction when displaying the image stored in the graphic memory on the panel.

Description

Flat display panel and image display method

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat panel display panel, and more particularly, to a flat panel display panel which drives an image by implementing scan lines vertically and column lines horizontally, and when storing an input image into a memory and storing images for display. The present invention relates to an image display method capable of ensuring sufficient duty by applying different addressing methods when writing.

Recently, flat panel displays have been commercialized in various ways such as liquid crystal displays, organic electroluminescent devices, and plasma display devices.

Among these, the organic electroluminescent device is characterized in that when the voltage is applied to both electrodes by stacking the organic light emitting layer, electrons and charges are recombined in the organic light emitting layer to emit light, and are driven at a low voltage and have low power consumption.

BACKGROUND ART A flat panel display panel using the organic electroluminescent element is widely used in a mobile communication terminal, a PDA, and the like.

As shown in FIG. 1, a sub-pixel is formed at a point where a column line 12 and a scan line 14 are formed on the panel 10, and the column line 12 and the scan line 14 cross each other. Is implemented. The sub-pixels correspond to R, G, and B, respectively, and the sub-pixels corresponding to each of the R, G, and B are combined and implemented as one unit pixel 16. An array of subpixels corresponding to R, G, and B constituting the unit pixel 16 is formed horizontally along the scan line 14.

In addition, a column driver 24 configured to output data to the column line 12 is formed above the panel 10, and a scan driver 26 that outputs a scan signal to the scan line 14 on one side of the panel 10. ) Is configured.

In addition, the input image is input to the control unit 20, and the control unit 20 includes a graphic memory 22 to write the input image, read the stored image for display, and output the data signal and the control signal accordingly. 24) and a scan driver 26.

That is, when the resolution of the panel is 176 x 220, the control unit 20 scans the input image in the line unit or the predetermined number of pixel units (in the burst mode) from the upper left to the lower right, and the graphics memory 22 The addressing direction for storage is also set and written from the upper left to the lower right in the same manner as the scan direction.

In addition, even when the image stored in the graphic memory 22 is displayed, the control unit 20 advances the addressing from the upper left to the lower right in units of lines or a predetermined number of pixels (in the burst mode). Accordingly, the scanned data is sequentially displayed in units of lines or a predetermined number of pixels (in the burst mode) from the upper left portion of the panel 10 to the lower right direction.

As the flat panel display panel using the conventional organic EL device configured as described above is gradually developed for high image quality, the number of scan lines is increasing.

However, if the scan line is gradually increased to realize a good display screen in a limited size panel, the scan signal duty is limited by that amount.

Therefore, when the duty is limited and there is not enough time to express the data applied to the column line, sufficient luminance is not guaranteed and the luminance of the display screen is deformed.

An object of the present invention is to ensure sufficient duty of a scan signal by adjusting the arrangement of column lines and scan lines of a flat panel display panel.

Another object of the present invention is to write an image to be stored in the graphic memory, and display the image in a state where luminance is sufficiently secured by applying addressing differently when reading to display the stored image.

According to an aspect of the present invention, there is provided a flat panel display panel including: a controller having a graphic memory configured to store an input image; A panel for displaying an image; A scan driver configured at an upper portion of the panel to provide a scan signal in a vertical direction to the panel as a control signal output from the controller; And a column driver configured at one side of the panel to provide a column signal to the panel in a horizontal direction as data and control signals output from the controller.

Accordingly, when the controller stores the input image in the graphic memory, the image display performs first addressing by corresponding the data scanned in the horizontal direction in the vertical direction, and displays the image stored in the graphic memory on the panel. When the data scanned in the horizontal direction correspond to the vertical direction, the second addressing is performed.

The column driver may be disposed on the right side of the panel, and the controller may scan every line in the horizontal direction of data stored in the graphic memory, and sequentially display each line from right to left in the scanned data. 2 Perform addressing.

The controller may perform at least one of the first addressing and the second addressing by applying a burst mode to perform the corresponding addressing by a predetermined number of pixels.

The controller may further include a buffer for storing the data of the predetermined number of pixels in order to apply the burst mode to the second addressing.

The scan driver may perform a dual scan to display the image on the panel.

Hereinafter, exemplary embodiments of a flat panel display panel and an image display method thereof according to the present invention will be described in detail with reference to the accompanying drawings.

In the present invention, the flat panel display panel may include an organic light emitting panel.

The flat panel display panel according to the present invention constitutes a column line in a horizontal direction and a scan line in a vertical direction on the panel, and correspondingly arranges a scan driver on an upper portion of the panel and a column driver on one side (the right side of the embodiment). Place it.

Specifically, referring to FIG. 3, a column line 32 and a scan line 34 are formed on the panel 30, and a sub pixel is implemented at a point where the column line 32 and the scan line 34 cross each other. do. The sub-pixels correspond to R, G, and B, respectively, and the sub-pixels corresponding to each of the R, G, and B are combined and implemented as one unit pixel 36. An array of subpixels corresponding to R, G, and B constituting the unit pixel 36 is vertically formed along the scan line 34.

In addition, a column driver 44 configured to output a column signal (data) to the column line 32 is formed at one side of the panel 30, and a scan signal is output to the scan line 34 at the upper part of the panel 30. The scan driver 46 is configured.

Then, the input image is input to the control unit 40, the control unit 40 is equipped with a graphics memory 42 to write to store the input image and to read the stored image for display and to thereby receive the data signal and the control signal accordingly. The column driver 44 and the scan driver 46 are provided.

Herein, the control unit 40 according to the present invention includes addressing for writing when the input image is stored in the graphic memory 42 and addressing for reading when the image stored in the graphic memory 42 is read and displayed on the panel 30. Do it differently.

An embodiment will be described in detail with an example in which the input image has a resolution of 176 × 220 and the panel 30 is also configured to implement a resolution of 176 × 220.

First, the addressing method to be written when storing in the graphics memory 42 will be described.

The controller 40 reads the input image in units of horizontal lines and writes the address to the graphic memory 42 in units of vertical lines. That is, the input image is read in the X direction (horizontal direction) and addressed and written to the graphic memory 42 in the Y direction (vertical direction).

That is, the scan start point (1, 1) at the upper left position of the input image is addressed to the lower left position in the graphics memory 42, and the scan end points 220 and 176 at the lower right position of the input image are provided in the graphic memory 42. It is addressed to the upper right position.

The image addressed and stored in the graphics memory 42 as described above is consequently stored in a 90 ° rotation to the left.

 Thereafter, the controller 40 describes an addressing method of reading an image stored in the graphic memory 42 for display on the panel 30.

The stored image of the graphics memory 42 stored with the input image (original image) rotated 90 ° to the left is read and read in the horizontal direction (X direction) from the upper left position in the stored state.

In the embodiment of the present invention, the column driver 44 is configured at the right side of the panel 30 and the scan driver 46 is configured at the top of the panel 30. Therefore, as described above, the data which leads every line in the horizontal direction in the graphic memory 42 is input in the vertical direction (Y direction), and the display proceeds in the horizontal direction.

That is, the data addressed to the upper left positions (1, 176) of the graphic memory 42 correspond to the upper right positions (1, 1) of the panel 30, and the upper right positions (220, 176) of the graphics memory 42. ) And the data read out correspond to the lower right positions 220 and 176 of the panel 30.

As a result, the image stored in the state rotated 90 ° to the left is returned to the original state and displayed as it is rotated 90 ° to the right.

According to the addressing method described above, an embodiment according to the present invention can display an image without deformation of the original image data. Therefore, in the configuration of FIG. According to the scan line is composed of 176 lines.

As a result, since the scan period divided into 1/220 of one frame period is increased to 1/176, the duty for providing the scan signal is guaranteed. Also, the effect can be doubled by applying dual scan.

Scanning in burst mode (such as in units of 4 pixels or units of 8 pixels) for speed improvement and power consumption reduction in each of addressing for writing to the graphics memory 42 and addressing for reading to the panel 30 is possible. It can be variously applied according to the intention.

For reference, addressing for writing to the graphic memory 42 and addressing for reading to the panel 30 according to an embodiment of the present invention may be implemented by the following programming.

If XA is defined as the address for driving 176 scans and YA is the address for driving 220 data,

Addressing for writing to the graphics memory 42,

for (y = 1, y <= YA; y ++) {

for (x = 1, x <= XA; x ++) {

GRAM (x, y) = Image_data (R, G, B 18 bits); // store 1 pixel at a time in Gram}

Can be implemented as

To apply burst mode,

for (y = 1, y <= YA; y ++) {

for (x = 1, x <= XA; x = x + 4) {// light every 4 pixels

GRAM (x, y) = Image_data (R, G, B 18 bits) × 4;}

It can be implemented as.

On the other hand, the addressing for the lead to the panel 30,

for (x = 1, x <= XA; x ++) {

for (y = 1, y <= YA; y ++) {

GRAM (x, y) = Image_data (R, G, B 18bits); / 1 scan of pixel}

Can be implemented as

To apply burst mode,

for (x = 1, x <= XA; x ++) {

for (ys = 1, ys <= YA; ys = ys + 8) {// light every 8 pixels

GRAM (x, ys) = Image_data (R, G, B 18 bits) x 8;

// Scan the 8 pixels at once by extending the bandwidth of GRAM from 18 to 144.

// The panel needs to send 1 pixel, so the control requires an 8 pixel buffer.}

It can be implemented as.

According to the present invention, the arrangement of the column lines and the scan lines of the organic electroluminescent panel may be adjusted to ensure sufficient duty of the scan signal, and the input image may be stored in the graphic memory and separately addressed in the process of displaying the stored images. By applying this, the image can be displayed in a state where luminance is sufficiently secured without deformation of the original image.

1 is a block diagram of a conventional organic electroluminescent panel

2 is a view for explaining an image display method of a conventional organic electroluminescent panel.

3 is a block diagram illustrating a preferred embodiment of a flat panel display panel according to the present invention.

4 is a view for explaining an image display method according to an embodiment of the present invention.

Claims (7)

A controller having a graphic memory for storing an input image; A panel for displaying an image; A scan driver configured at an upper portion of the panel to provide a scan signal in a vertical direction to the panel as a control signal output from the controller; And A column driver configured at one side of the panel to provide a column signal to the panel in a horizontal direction as data and control signals output from the controller, The control unit performs first addressing by vertically matching data scanned in a horizontal direction when storing the input image in the graphic memory, and scanning in a horizontal direction when displaying an image stored in the graphic memory on the panel. And second addressing by correlating the data in the vertical direction. The method of claim 1, The column driver is disposed on the right side of the panel, and the control unit scans every line in the horizontal direction of data stored in the graphic memory, and the second addressing to sequentially display each line from right to left. And a flat panel display panel. The method of claim 1, And the control unit performs at least one of the first addressing and the second addressing by applying a burst mode to perform corresponding addressing by a predetermined number of pixels. The method of claim 3, wherein And the control unit further includes a buffer for storing the data of the predetermined number of pixel units to apply the burst mode to the second addressing. The method of claim 1, And the scan driver performs dual scanning to display the image on the panel. An image display method of a flat panel display panel which performs driving for storing a predetermined input image in a graphic memory and then displaying the same on a panel. A first addressing step of scanning the input image in a horizontal direction, addressing and writing the address to be sequentially stored in the memory in a vertical direction; And And a second addressing step of scanning an image stored in the memory in a horizontal direction and addressing and reading the image to be sequentially displayed in the vertical direction in the memory. The method of claim 6, And applying a burst mode to at least one of the first addressing step and the second addressing step to perform corresponding addressing in units of a predetermined number of pixels.