1. Field of the Invention
The present invention relates to a display device using a chip on film (COF) operating with a low driving voltage.
2. Background of the Related Art
Lately, display devices having wide image areas are the trend of the times. The display devices have much more data and scan lines in order to improve image quality.
However, if the number of the scan lines is increased to improve the image quality of the display device having a simple matrix structure, there are many limitations on driving the display device.
FIG. 1 illustrates a diagram of a display device using a COF according to a related art.
Referring to FIG. 1, data lines are connected straight to a chip on film (hereinafter abbreviated COF) from a display panel. And, scan lines, which are arranged on left and right sides of the display panel respectively, extend from the display panel with forming a curve so as to be coupled with the COF.
As mentioned in the above explanation, the scan lines forming curves from both sides of the display panel extend longer than the data lines. Such a structure results in increasing line resistance of the scan lines and further delays a signal response.
In display devices such as EL (electro-luminescence), LED (light emitting diode), FED (field emission display) and the like, the line resistance of the scan lines has a close relation to the driving voltage of the display devices.
Namely, if the line resistance of the scan lines increases, the driving voltage thereof increases as well. Thus, the line resistance of the display device having a low driving voltage is a major issue.
Accordingly, the present invention is directed to a display device using a COF that substantially obviates one or more problems due to limitations and disadvantages of the related art.
An object of the present invention is to provide a display device using a COF enabling to reduce line resistance of scan and data lines in a display device.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
To achieve these objects and other advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, a display device using a COF according to the present invention includes a display panel, a COF having a connection part on which the display channel is placed and a chip part on which a chip is placed, data and scan lines extending from the display panel, scan line connection lines on the connection part, the scan line connection lines connecting the scan lines electrically to the COF, and data line connection lines on the connection part, the data line connection lines connecting the data lines electrically to the COF, wherein the scan lines are directly connected to the chip on a first line in parallel with an extending line from the COF through the scan line connection lines formed on the COF at both sides of the display panel.
Preferably, the scan line connection lines are straightly connected to the scan lines at both sides of the display panel corresponding to the first line and the data line connection lines are connected to the data lines extending from both sides of the display panel corresponding to the second line. Also, a substrate material of the COF is one of glass and plastic.
In another aspect of the present invention, a display device using a COF includes a display panel, the COF having a connection part on which the display channel is placed and a chip part on which a chip is placed, data and scan lines extending from the display panel, scan line connection lines on the connection part, the scan line connection lines connecting the scan lines electrically to the COF, and data line connection lines on the connection part, the data line connection lines connecting the data lines electrically to the COF, wherein the scan lines are straightly connected to the COF through the scan line connection lines at both sides of the display panel on a first line in parallel with a direction extending from the COF, a portion of the data lines extends toward the chip from both sides of the display panel corresponding to a second line in a direction different from the extending direction of the COF, and the other portion of the data lines extends toward the chip from both sides of the display panel corresponding to a second line in a direction different from the extending line of the COF and is connected to the COF through the data line connection lines.
In a further aspect of the present invention, a display device using a COF includes a display panel, a COF having a connection part on which the display channel is placed and a chip part on which a chip is placed, data and scan lines extending from the display panel, scan line connection lines on the connection part, the scan line connection lines connecting the scan lines electrically to the COF, and data line connection lines on the connection part, the data line connection lines connecting the data lines electrically to the COF, wherein the scan lines are straightly connected to the COF toward the chip through the scan line connection lines at both sides of the display panel on a first line in parallel with an extending direction of the COF, and the data lines are connected to the COF through the data line connection lines from both sides of the display panel on a second line in a direction different from the extending direction of the COF.
Preferably, the scan line connection lines extend straightly on the first line and the data line connection lines form a curve with a predetermined angle so as to extend from the first line to the second line. The predetermined angle is 90xc2x0.
It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.