One-sheet test device and test method thereof

A one-sheet test device for testing panels on a one-sheet substrate and a test method thereof, wherein the test device and method are capable of performing a one-sheet test regardless of the number of panels formed on the one-sheet substrate. The one-sheet test device includes a signal supplier and a connection board. The signal supplier is for generating a plurality of signal groups and a plurality of dummy signals for testing the panels. The connection board is for transmitting a first signal group of the signal groups to a first panel of the panels corresponding to the first signal group, and for transmitting a signal of at least one signal group of the plurality of signal groups to at least two of the panels when the number of panels is larger than the number signal groups. The one-sheet test device may include a connection controller for controlling the connection board.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to and the benefit of Korean Patent Application No. 10-2009-0097763, filed in the Korean Intellectual Property Office on Oct. 14, 2009, the entire content of which is incorporated herein by reference.

BACKGROUND

Aspects of the present invention relate to a one-sheet test device and a test method thereof.

2. Description of Related Art

In general, after panels of a plurality of organic light emitting displays are formed on one substrate (hereinafter referred to as a “one-sheet substrate”), the panels are scribed to be separated into individual panels. Before the panels are cut or separated from the one-sheet substrate, diagnostics such as lighting by the panel unit, a test process, an aging process by the panel unit, or the like, are performed on the sheet structure. In the above-mentioned process, a signal is provided to the one-sheet substrate by using a common wire at the side of the one-sheet substrate in order to drive each panel.

However, as product development models are varied, the sizes and number of the panels formed on the one-sheet substrate vary. Since the known one-sheet test devices are designed to test one-sheet substrates having panels of limited sizes and number, when the sizes and number of the panels vary, it may be very difficult to test the one-sheet substrates. Further, solving the problem by modifying or redesigning the test device increases the manufacturing cost.

SUMMARY

Embodiments of the present invention provide a one-sheet test device and a test method thereof that can test a one-sheet substrate regardless of the number of panels formed on the one-sheet substrate.

According to an embodiment of the present invention, a one-sheet test device is provided. The one-sheet test device is configured to test a one-sheet substrate that includes a plurality of panels. The one-sheet test device includes a signal supplier and a connection board. The signal supplier is for generating a plurality of signal groups and a plurality of dummy signals for testing the plurality of panels. The connection board is for transmitting a first signal group of the plurality of signal groups to a first panel of the plurality of panels corresponding to the first signal group, and transmitting a signal of at least one signal group of the plurality of signal groups to at least two panels of the plurality of panels when a number of the plurality of panels is larger than a number of the plurality of signal groups.

Each of the plurality of signal groups may include red, green, and blue data signals, a gate signal, and a power signal.

The plurality of dummy signals may correspond to the red, green, and blue data signals and the gate signal.

The connection board may further be for transmitting the plurality of dummy signals to one of the at least two panels, for transmitting the red, green, and blue data signals and the gate signal of the at least one signal group to an other of the at least two panels, and for transmitting the power signal of the at least one signal group to the one of and the other one of the at least two panels.

The connection board may output only signal groups of the plurality of signal groups corresponding to the plurality of panels when the number of the plurality of panels is not larger than the number of the plurality of signal groups.

According to another embodiment of the present invention, a test method of a one-sheet test device is provided. The test method includes generating a plurality of signal groups and a plurality of dummy signals for testing a one-sheet substrate including a plurality of panels, transmitting a first signal group of the plurality of signal groups to a first panel of the plurality of panels corresponding to the first signal group, and transmitting a signal of at least one signal group of the plurality of signal groups to at least two panels of the plurality of panels when a number of the plurality of panels is larger than a number of the plurality of signal groups.

Each of the plurality of signal groups may include red, green, and blue data signals, a gate signal, and a power signal.

The test method may further include generating the plurality of dummy signals at levels corresponding to the red, green, and blue data signals and the gate signal.

The transmitting the signal of the at least one signal group to the at least two panels of the plurality of panels may include transmitting the plurality of dummy signals to one of the at least two panels; transmitting the red, green, and blue data signals and the gate signal of the at least one signal group to an other one of the at least two panels; and transmitting the power signal of the at least one signal group to the one of and the other one of the at least two panels.

The test method may further include outputting only signal groups of the plurality of signal groups corresponding to the plurality of panels when the number of the plurality of panels is not larger than the number of the plurality of signal groups.

According to yet another embodiment of the present invention, a one-sheet test device is provided. The one-sheet test device is configured to test a one-sheet substrate that includes a plurality of panels. The one-sheet test device includes a signal supplier, a connection board, and a connection controller. The signal supplier is for generating a plurality of signal groups and a plurality of dummy signals for testing the plurality of panels. The connection board is for transmitting the plurality of signal groups and the plurality of dummy signals to the plurality of panels. The connection controller is for controlling the connection board. The connection controller is configured to control the connection board to transmit a first signal group of the plurality of signal groups to a first panel of the plurality of panels corresponding to the first signal group, and transmit a signal of at least one signal group of the plurality of signal groups to at least two panels of the plurality of panels when a number of the plurality of panels is larger than a number of the plurality of signal groups.

Each of the plurality of signal groups may include red, green, and blue data signals, a gate signal, and a power signal.

The plurality of dummy signals may correspond to the red, green, and blue data signals and the gate signal.

The connection controller may be further configured to control the connection board to transmit the plurality of dummy signals to one of the at least two panels, transmit the red, green, and blue data signals and the gate signal of the at least one signal group to an other of the at least two panels, and transmit the power signal of the at least one signal group to the one of and the other one of the at least two panels.

The connection controller may be further configured to control the connection board to output only signal groups of the plurality of signal groups corresponding to the plurality of panels when the number of the plurality of panels is not larger than the number of the plurality of signal groups.

As described above, according to embodiments of the present invention, it is possible to test a one-sheet substrate regardless of the number of panels formed on the one-sheet substrate.

DETAILED DESCRIPTION

FIG. 1is a diagram showing a one-sheet test device according to an embodiment of the present invention.

Referring toFIG. 1, the one-sheet test device according to an embodiment of the present invention includes a signal supplier100, a connection board200, and a connection controller400for testing a one-sheet substrate300. The signal supplier100generates a plurality of test signals for testing a plurality of cells (panels) constituting the one-sheet substrate300. The number of output pins of the signal supplier100is determined at a design stage of the signal supplier100. One signal is outputted from each output pin of the signal supplier100, and in an embodiment of the present invention, the signal supplier100having 28 output pins is shown for convenience of description, but the present invention is not limited thereto.

The signal supplier100generates a plurality of data signals. In one embodiment, the signal supplier100is for testing color display panels, and the signals include a plurality of data signals VR1to VR4, VG1to VG4, and VB1to VB4, a first power signal ELVDD, a plurality of second power signals ELVSS1to ELVSS4, and a plurality of gate signals VGATE1to VGATE4. When a one-sheet substrate is tested, the first power signal ELVDD is selectively supplied to one of the plurality of cells of the one-sheet substrate300. It can be determined whether a cell supplied with the first power signal ELVDD is erroneous by sensing line current to which the first power signal ELVDD is transmitted.

The plurality of data signals VR1to VR4, VG1to VG4, and VB1to VB4include red data signals VR1to VR4supplied to a plurality of red sub-pixels of a corresponding cell of the plurality of cells constituting the one-sheet substrate300, green data signals VG1to VG4supplied to a plurality of green sub-pixels of a corresponding cell of the plurality of cells constituting the one-sheet substrate300, and blue data signals VB1to VB4supplied to a plurality of blue sub-pixels of a corresponding cell of the plurality of cells constituting the one-sheet substrate300. The plurality of second power signals ELVSS1to ELVSS4are signals for driving the plurality of pixels of the corresponding cells of the plurality of cells constituting the one-sheet substrate300. The plurality of gate signals VGATE1to VGATE4are signals for transmitting the corresponding data signal to the plurality of pixels of the corresponding cell among the plurality of cells constituting the one-sheet substrate300.

The signal supplier100further may output a plurality of dummy signals, such as dummy signals VDM1to VDM4inFIG. 1. In an embodiment of the present invention, it is possible to test a one-sheet substrate300that includes more cells than the number of groups of test signals outputted from the signal supplier100by using the plurality of dummy signals VDM1to VDM4. Hereinafter, a plurality of test signals for testing one cell (hereinafter referred to as a “panel”) among the plurality of test signals outputted from the signal supplier100will be described by being defined as one signal group. For example, a first signal group includes red, green, and blue data signals VR1, VG1, and VB1, second power signal ELVSS1, and gate signal VGATE1, while a second signal group includes red, green, and blue data signals VR2, VG2, and VB2, second power signal ELVSS2, and gate signal VGATE2. That is, the signal supplier100according to an embodiment of the present invention generates four signal groups (e.g., the first signal group includes red data signal VR1, green data signal VG1, blue data signal VB1, second power signal ELVSS1, and gate signal VGATE1, and the second, third, and fourth signal groups respectively include corresponding similar signals) and four dummy signals VDM1to VDM4.

The connection board200is controlled by the connection controller400to transmit the plurality of signal groups to corresponding panels of the plurality of panels constituting the one-sheet substrate300. The connection controller400determines a signal group outputted from the connection board200depending on the number of the plurality of signal groups and the number of the plurality of panels constituting the one-sheet substrate300. A detailed description thereof will be given with reference toFIGS. 2 through 5.

FIGS. 2 to 5are diagrams for illustrating a test method of a one-sheet test device according to an embodiment of the present invention, in this case testing a sheet including color display panels. Herein,FIG. 2is a schematic diagram for illustrating a connection relationship between the connection board200and the one-sheet substrate300when 4 panels are formed on the one-sheet substrate300, andFIG. 3is an equivalent circuit diagram of a red sub-pixel included in a first panel300_1shown inFIG. 2.FIG. 4shows a case in which three panels are formed on the one-sheet substrate300′, andFIG. 5shows a case in which five panels are formed on the one-sheet substrate300″. Only one array (e.g., column) of the panels shown inFIGS. 2 to 5is shown for convenience of description, but the present invention is not limited thereto and may include a plurality of arrays (e.g., columns).

First, referring toFIG. 2, first to fourth panels300_1to300_4and a plurality of pads for transmitting signals to the first to fourth panels300_1to300_4are formed on the one-sheet substrate300. The first to fourth panels300_1to300_4each include a plurality of pixels PX. Each of the pixels PX includes 3 sub-pixels, that is, a red sub-pixel PX_R, a green sub-pixel PX_G, and a blue sub-pixel PX_B.

Each sub-pixel of pixel PX, e.g., the red sub-pixel PX_R included in the first panel300_1, includes an organic light emitting diode (OLED), a driving transistor M1, a capacitor Cst, and a switching transistor M2, as shown inFIG. 3. The sub-pixel may also include a light emission control transistor between the driving transistor M1and the OLED. The driving transistor M1receives a first power signal ELVDD at a source terminal thereof, and is connected to an anode terminal of the OLED at a drain terminal thereof. The driving transistor M1is connected to a drain terminal of the switching transistor M2at a gate terminal thereof. The driving transistor M1allows current IOLED(of which magnitude varies depending on a voltage applied between the gate terminal and the source terminal) to flow to the OLED.

The switching transistor M2receives a first gate signal VGATE1at a gate terminal thereof, and receives a first red data signal VR1at a source terminal thereof. The switching transistor M2performs a switching operation in response to the first gate signal VGATE1. When the switching transistor M2is turned on, a voltage corresponding to the first red data signal VR1is transmitted to the gate terminal of the driving transistor M1.

The capacitor Cst is connected between the source terminal and the gate terminal of the driving transistor M1. The capacitor Cst charges the data voltage applied to the gate terminal of the driving transistor M1and maintains this even after the switching transistor M2is turned off. The OLED receives a second power signal ELVSS1at a cathode terminal thereof. The OLED emits light of intensity that varies depending on the current IOLEDthat the driving transistor M1supplies.

The connection controller400(shown inFIG. 1) controls the connection board200to output the first to fourth signal groups when the number of the panels constituting the one-sheet substrate300corresponds to the number of the signal groups, as shown inFIG. 2. More specifically, the connection controller400controls the connection board200so as to transmit the first signal group, that is, the red, green, and red data signals VR1, VG1, and VB1, the second power signal ELVSS1, and the gate signal VGATE1to the plurality of pads P1to P5connected to the first panel3001from the connection board200. By this configuration, the connection controller400controls the connection board200so as to transmit the second to fourth signal groups to the plurality of pads connected to the second to fourth panels300_2to300_4corresponding to the second to fourth signal groups, respectively. InFIG. 2, the connection controller400(shown inFIG. 1) controls the connection board200to not transmit the plurality of dummy signals VDM1to VDM4to any pad.

InFIG. 4, the number of the panels of the one-sheet substrate300′ is smaller than the number of signal groups. Accordingly, the connection controller400(shown inFIG. 1) controls the connection board200to output only signal groups corresponding to the number of the panels. More specifically, the connection controller400controls the connection board200to transmit each signal of the first signal group to a plurality of pads P11to P15connected to the first panel300_1from the connection board200. In addition, the connection controller400controls the connection board200so as to transmit the signals of the second and third signal groups to the plurality of pads of the second and third panels300_2and300_3corresponding to the second and third signal groups, respectively. Here, the connection controller400(shown inFIG. 1) controls the connection board200to not transmit the fourth signal group and the plurality of dummy signals VDM1to VDM4to any pad.

InFIG. 5, the number of the panels of the one-sheet substrate300″ is larger than the number of signal groups. That is, there are five panels300_1to300_5in the embodiment ofFIG. 5. Accordingly, the connection controller400controls the connection board200so as to transmit the first to fourth signal groups to each of panels300_1to300_4, respectively, of the one-sheet substrate300″. In addition, one or more signals of at least one of the first to fourth signal groups (in this case, the fourth signal group) and the plurality of dummy signals VDM1to VDM4, are transmitted to at least two panels (in this case, panels300_4and300_5). More specifically, the connection controller400controls the connection board200so as to transmit each signal of the first signal group to a plurality of pads P21to P25connected to the first panel300_1. Likewise, the connection controller400controls the connection board200so as to transmit the signals of the second and third signal groups to the plurality of pads of the second and third panels300_2and300_3corresponding to the second and third signal groups, respectively.

In addition, the connection controller400controls the connection board200so as to transmit a second power signal ELVSS4of the fourth signal group to fourth and fifth panels300_4and300_5. Herein, the fourth signal group includes red, green, and blue data signals VR4, VG4, and VB4, and gate signal VGATE4transmitted to a plurality of pads connected to the fourth panel300_4, and a plurality of dummy signals VDM1to VDM4transmitted to a plurality of pads connected to the fifth panel300_5, respectively. InFIG. 5, the plurality of dummy signals VDM1to VDM4are generated at levels of red, green, and blue data signals VR5, VG5, and VB5, and gate signal VGATE5, respectively. In addition, a second power signal ELVSS4of the fourth signal group is commonly transmitted to the plurality of pads connected to the fourth and fifth panels300_4and300_5.

Accordingly, according to embodiments of the present invention, it is possible to perform a one-sheet test for panels of various numbers without increasing or decreasing the number of output pins of a signal generator100or a number of input pins of a connection board200depending on the number of panels formed on a one-sheet substrate300.