KR101349778B1 - Liquid crystal display device for displaying a reversed image - Google Patents

Abstract

The present invention relates to a technique of performing left and right inversion of an image using a timing controller in a liquid crystal display. The present invention includes a timing controller for outputting driving control signals of the gate driver and the data driver, and outputting the image data in the input order or in the reverse order to perform the inversion function when outputting the image data; A gate driver supplying a gate-on signal to each gate line of the liquid crystal panel; A data driver for outputting the image data to each data line of the liquid crystal panel in an input order or in an opposite order to an inverting function to perform an inversion function; It is achieved by a liquid crystal panel driven by the image data and the gate-on signal to display an image normally or in an inverted form.

Description

Liquid crystal display for displaying a reversed image {LIQUID CRYSTAL DISPLAY DEVICE FOR DISPLAYING A REVERSED IMAGE}

Figure 1 (a) is an exemplary view showing a normal data output order of the data driver in the conventional liquid crystal display device.

Figure 1 (b) is an exemplary view showing that the image is normally displayed by the data driver in the conventional liquid crystal display device.

Figure 2 (a) is an exemplary view showing a data output sequence of the data driver when the reverse image request in the conventional liquid crystal display device.

Figure 2 (b) is an exemplary view of the display of the reverse image by the data driver in the conventional liquid crystal display device.

3 is a block diagram of an inverted image display device of a liquid crystal display device according to the present invention;

4 is a diagram illustrating image data output of a timing controller according to the present invention;

FIG. 5 is a table illustrating output of image data according to whether the image reversing request signal of the timing controller and the image reversing function of the data driver are provided.

6 (a)-(c) are diagrams showing normal display of an image according to the present invention;

7 (a) to 7 (c) are diagrams illustrating an inverted display of an image according to the present invention.

DESCRIPTION OF THE REFERENCE SYMBOLS

31: timing controller 32: gate driver

33: data driver 34: liquid crystal panel

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for inverting and displaying an image in a liquid crystal display device, and more particularly, to an inverted image display device of a liquid crystal display device suitable for performing a function of inverting left and right of an image in a timing controller.

Recently, with the development of information technology (IT), the importance of the display device as a visual information transmission medium is further emphasized, and in order to preoccupy the main position in the future, it is necessary to satisfy requirements such as low power consumption, thinning, light weight, and high quality. .

Liquid Crystal Display is a device that displays images by using optical anisotropy of liquid crystal. It has fast speed of market for Cathode Ray Tube (CRT) due to its thin, small size, low power consumption and high quality. Is being replaced by.

Briefly explaining the driving principle of the liquid crystal display, the timing controller controls the gate control signal and the data driver to control the gate driver by using digital video data RGB and vertical / horizontal synchronization signals and clock signals supplied from the system. In addition to outputting a data control signal, the digital video data RGB is sampled and rearranged and supplied to the data driver. The liquid crystal panel is driven by the gate driver and the data driver to display an image of the video data RGB.

However, in the case of the two-port (Even / Odd) data driver (or the data driving integrated circuit D-IC), the order of odd data and even data does not change when left / right inversion.

For example, FIG. 1A illustrates a data output sequence of a data driver in a conventional liquid crystal display, and FIG. 1B illustrates that an image is normally displayed according to a normal data output sequence of the data driver. It is shown.

On the other hand, FIG. 2A shows a data output sequence of a data driver when a left / right (or up / down) inversion request is made for an image to be displayed in a conventional LCD, and FIG. 2B shows the data driver. An example of the image displayed by the data output order is shown. In this case, as shown in the above description, it may be confirmed that the order of odd / even data is not changed correctly and the original image is inverted and displayed in an incorrect form.

As described above, in the liquid crystal display according to the related art, when a left / right (or up and down) inversion command is issued to the two-port (Even / Odd) data driver, some two-port data drivers may not properly perform the inversion function of the image. There was a defect that could not display the correct left-right reversed image.

Accordingly, an object of the present invention is to provide an inverted image display device which performs a left / right inversion function of an image in a timing controller and supplies the inverted image data to a liquid crystal panel through a data driver.

Another object of the present invention is to include the left and right inverting function of the image in the timing controller, and selectively performs the left and right inverting function of the image in the timing controller or the data driver depending on whether the data driver includes the left and right inversion function of the image. An inverted image display device is provided.

The present invention for achieving the above object, while outputting the drive control signal of the gate driver and the data driver, and outputs the image data of the odd (Odd), Even (even) in the input order or inverting function A timing controller for outputting in the reverse order of the input order to perform the operation; A gate driver supplying a gate-on signal to each gate line of the liquid crystal panel; A data driver for outputting an odd or even image data to each data line of the liquid crystal panel in an input order or in an opposite order to an inverting function to perform an inversion function; And a liquid crystal panel driven by the image data and the gate-on signal to display an image normally or in an inverted form.

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

3 is a block diagram showing an embodiment of an inverted image display device of a liquid crystal display according to the present invention. As shown in FIG. 3, various controls for controlling the driving of the gate driver 32 and the data driver 33 are shown. A timing controller 31 for outputting a signal and outputting the image data of the odd and even, in the input order or in the reverse order to perform the inversion function; A gate driver 32 for supplying a gate-on signal to each gate line of the liquid crystal panel 34; A data driver 33 for outputting an odd or even image data to each data line of the liquid crystal panel 34 in an input order or in an opposite order to an inverting function to perform an inversion function; It includes a liquid crystal panel 34 which is driven by the image data and the gate-on signal to display an image normally or in a left-right (or up-down) inverted form. If described in detail with reference to 4 to 7 as follows.

The timing controller 31 controls the gate control signal GDC for controlling the gate driver 32 and the data driver 3 (3) using the vertical / horizontal synchronization signal and the clock signal supplied from the system. The timing controller 31 samples the digital video data RGB input from the system, rearranges the digital video data RGB, and supplies the same to the data driver 33.

The gate driver 32 sequentially supplies scan pulses (gate pulses) to the gate lines G1 to Gn in response to the gate control signal GDC input from the timing controller 31, thereby supplying data. Horizontal lines of the liquid crystal panel 34 are selected.

The data driver 33 converts the digital video data RGB into a data voltage (analog gamma compensation voltage) corresponding to the gray scale value in response to the data control signal DDC input from the timing controller 31. The converted data voltage is supplied to the data lines D1 to Dm on the liquid crystal panel 34. The data driver 33 is a data driver of two ports (Even / Odd).

 The liquid crystal panel 34 includes a plurality of liquid crystal cells Clc that are arranged in a matrix at the intersection of the data lines D1 to Dm and the gate lines G1 to Gn. The data signal and the gate-on signal are driven to display an image.

For reference, in the above description, the data driver 33 and the gate driver 32 are separately installed from the liquid crystal panel 34. However, in recent years, each of them is directly mounted on the liquid crystal panel 35 by a packaging technique. Is in.

However, the timing controller 31 has a function of changing and outputting the output order of the input image data so as to perform the image inversion function. However, when the image inversion request signal REQ is input, the timing controller 31 does not change and output the output order of input image data for image inversion unconditionally, and whether the data driver 33 has an image inversion function. In this case, the image reversal function is selectively performed.

For example, as shown in FIG. 4, the input image data is inputted to the timing controller 31 such that the odd image data RO0 to RO5, GO0 to GO5 BO0 to BO5 and the even image data RE0 to RE5, GE0 to GE5, When BE0 to BE5 are supplied, output image data is output in the order of the original input image data, or RE0 to RE5, GE0 to GE5, BE0 to BE5, RO0 to RO5, GO0 to GO5 and BO0 to BO5 for image inversion. Change the output order.

FIG. 5 shows an exemplary table in which the timing controller 31 having the image inversion function selectively performs the image inversion function according to whether the image inversion request signal REQ_INV and the image inversion function of the data driver 33 are provided. Here, if the image inversion request signal REQ_INV is 'high' ('H'), there is no image inversion request, and in contrast, in case of 'low' ('L'), there is an image inversion request. In addition, when the DC inversion signal DIC_INV is 'high' ('H'), the data driver 33 does not have an image inversion function. On the contrary, when the DC inversion signal DIC_INV is 'low' ('L'), it has an image inversion function. One case.

That is, the timing controller 31 outputs output image data in the order of input image data when the two signals REQ_INV and DIC_INV are 'H' and 'H', and when 'H' and 'L' are output. Output image data is output in the reverse order of the input image data to perform the image reversal function, and output image data is output in the reverse order of the input image data to perform the image reversal function even in the case of 'L' and 'H'. In the case of 'L' and 'L', the output image data is output in order of the input image data so that the image reversal function is performed by the data driver 33.

FIG. 6 illustrates that a normal image that is not inverted is displayed when the timing controller 31 does not perform the image inversion function while the data driver 33 having no image inversion function is employed.

That is, FIG. 6A illustrates that the image inversion request signal REQ_INV is input to high and the DC inversion signal DIC_INV is input to high in the timing controller 31. Indicates outputting the output image data in the order of the input image data. In this case, since the data driver 33 has no image inversion function, the data driver 33 outputs the output image data in the order of the input image data as shown in FIG. Accordingly, the non-inverted normal image is displayed on the liquid crystal panel 34 as shown in FIG.

On the contrary, in FIG. 7, the timing controller 31 performs the image inversion function according to the inversion image output request and displays the inverted image while the data driver 33 having no image inversion function is employed. It is shown.

That is, FIG. 7A illustrates that the image inversion request signal REQ_INV is input to the timing controller 31 as 'low' and the DIC inversion signal DIC_INV is input as 'high' and the timing controller 31 is inputted to the timing controller 31. Indicates that the output image data is output in the reverse order of the input image data. In this case, even if the data driver 33 does not perform the inversion function, the output image data is output in the reverse order of the input image data as shown in FIG. 7B by the image inversion function of the timing controller 31. do. Accordingly, the reversed image is displayed on the liquid crystal panel 34 as shown in FIG.

As described in detail above, the present invention performs an inverted display function of an image in the timing controller of the liquid crystal display device, so that an image inversion function can be performed even when the data driver does not have the image inversion function.

In addition, the timing controller has an inverted display function of the image and the data driver selectively performs the left and right inversion function of the image in consideration of whether the image driver has the inversion function of the image. There is an effect to cope with.

Claims (7)

A liquid crystal panel in which a plurality of gate lines and data lines cross each other and display an image; A gate driver supplying a gate-on signal to the gate line; A data driver which outputs image data to the data line and outputs the data in an input order or in an opposite order; And A timing controller which outputs driving control signals of the gate driver and the data driver, and controls the liquid crystal panel to output a normal image or an inverted image in response to an image inversion request signal and a DC inversion signal; Liquid crystal display for displaying a reversed image comprising a. The method of claim 1, The reverse image, A liquid crystal display for displaying an inverted image, which is a function of inverting an image in left and right or up and down directions. The method of claim 1, The image data may include: A liquid crystal display for displaying a reversed image, characterized in that the image data of the odd, even. The method of claim 1, The timing controller includes: When the image inversion request signal is high and the DC inversion signal is low, the order of the input images is changed and supplied to the data driver. Supplying an input image as it is when the image inversion request signal is low and the DIC inversion signal is high or low; Liquid crystal display for displaying a reverse image characterized in that. delete delete The method of claim 1, And the data driver is configured to receive an image through two ports (Even / Odd).

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