Wiring disconnection detection circuit and organic light emitting display device

Abstract

The present disclosure relates to a wiring disconnection detection circuit and an organic light-emitting display device including the wiring disconnection detection circuit. The wiring disconnection detection circuit includes a low-power voltage supplier, a monitoring wiring, and a wiring disconnection determiner. The low-power voltage supplier supplies a low-power voltage to a low-power voltage wiring extending along the periphery of the display panel in a normal operation mode of the display panel, and supplies a test voltage to the low-power voltage wiring in a wiring disconnection detection mode of the display panel. The monitoring wiring includes a first end connected to a point of the low-power voltage wiring and a second end that outputs a feedback voltage corresponding to the test voltage in the wiring disconnection detection mode. The wiring disconnection determiner receives the feedback voltage from the second end, measures the RC delay of the feedback voltage, and determines that the low-power voltage wiring is disconnected when the RC delay is greater than a predetermined reference value.

Description

Technical Field

[0001] Embodiments relate to a wiring disconnection detection circuit and an organic light emitting display device including the same. Background Art

[0002] When the display device has a structure in which a display panel driving circuit is placed behind a display panel, wiring defects may cause the wiring to become disconnected. Summary of the invention

[0003] The present disclosure aims to provide a wiring disconnection detection circuit and an organic light emitting display device including the wiring disconnection detection circuit, which can effectively detect whether a low-power voltage wiring extending along the periphery of a display panel is disconnected.

[0004] An embodiment relates to a wiring disconnection detection circuit, comprising: a low-power voltage supplier, which supplies a low-power voltage to a low-power voltage wiring extending along the periphery of a display panel in a normal operation mode of the display panel, and supplies a test voltage to the low-power voltage wiring in a wiring disconnection detection mode of the display panel; a monitoring wiring, comprising a first end connected to a point of the low-power voltage wiring and a second end at which a feedback voltage corresponding to the test voltage is output in the wiring disconnection detection mode; a wiring disconnection determiner, which receives the feedback voltage from the second end, measures an RC delay of the feedback voltage, and determines that the low-power voltage wiring is disconnected when the RC delay is greater than a predetermined reference value.

[0005] In example embodiments, the low power voltage may be a constant voltage, and the test voltage may be a clock pulse voltage.

[0006] In example embodiments, the RC delay may be measured based on a rise time of a feedback voltage corresponding to a test voltage.

[0007] In example embodiments, when a rising time of the feedback voltage is greater than a predetermined reference time, the wiring disconnection determiner may determine that the low power voltage wiring is disconnected.

[0008] In example embodiments, the low power voltage wiring may include a third terminal and a fourth terminal connected to the low power voltage supplier, and the low power voltage and the test voltage may be applied to the low power voltage wiring through the third terminal and the fourth terminal.

[0009] In example embodiments, the low power voltage supplier may be implemented in a display panel driving circuit that drives the display panel, and the low power voltage wiring may extend through a pad region where the display panel and the display panel driving circuit are connected.

[0010] In an example embodiment, the low power voltage supplier may include: a first voltage generating module, connected to a third end and a fourth end of the low power voltage wiring, and generating a low power voltage; a second voltage generating module, generating a test voltage; and a switch, connected between the second voltage generating module and the third end and the fourth end of the low power voltage wiring, and being turned off in a normal operation mode and turned on in a wiring disconnection detection mode.

[0011] In example embodiments, the second voltage generating module may be a DC-AC inverter.

[0012] In an example embodiment, the low power voltage supplier may include: a first voltage generating module that generates a low power voltage; a second voltage generating module that generates a test voltage; a first switch that is connected between the first voltage generating module and a third end and a fourth end of the low power voltage wiring, and is turned on in a normal operating mode and is turned off in a wiring disconnection detection mode; and a second switch that is connected between the second voltage generating module and the third end and the fourth end of the low power voltage wiring, and is turned off in the normal operating mode and is turned on in the wiring disconnection detection mode.

[0013] In example embodiments, the second voltage generating module may be a DC-AC inverter.

[0014] According to one aspect of an example embodiment, an organic light-emitting display device may include: a display panel having a structure in which, when a low power voltage is applied to a low power voltage wiring extending along a periphery of the display panel, the low power voltage is commonly applied to a plurality of pixels via a cathode layer connected to the low power voltage wiring through a bridge pattern; a display panel driving circuit that drives the display panel; and a wiring disconnection detection circuit that supplies a test voltage to the low power voltage wiring, receives a feedback voltage corresponding to the test voltage through a monitoring wiring connected to a point of the low power voltage wiring, and detects whether the low power voltage wiring is disconnected based on an RC delay of the feedback voltage in a wiring disconnection detection mode of the display panel.

[0015] In an example embodiment, a wiring disconnection detection circuit may include: a low power voltage supplier that supplies a low power voltage to a low power voltage wiring in a normal operation mode of a display panel and supplies a test voltage to the low power voltage wiring in a wiring disconnection detection mode; a monitoring wiring including a first end connected to a point of the low power voltage wiring and a second end at which a feedback voltage is output in the wiring disconnection detection mode; and a wiring disconnection determiner that receives the feedback voltage from the second end, measures an RC delay, and determines that the low power voltage wiring is disconnected when the RC delay is greater than a predetermined reference value.

[0016] In example embodiments, the low power voltage may be a constant voltage, and the test voltage may be a clock pulse voltage.

[0017] In example embodiments, the RC delay may be measured based on a rise time of a feedback voltage corresponding to a test voltage.

[0018] In example embodiments, when a rising time of the feedback voltage is greater than a predetermined reference time, the wiring disconnection determiner may determine that the low power voltage wiring is disconnected.

[0019] In example embodiments, the low power voltage wiring may include a third terminal and a fourth terminal connected to the low power voltage supplier, and the low power voltage and the test voltage may be applied to the low power voltage wiring through the third terminal and the fourth terminal.

[0020] In example embodiments, the low power voltage supplier may be implemented in the display panel driving circuit, and the low power voltage wiring may extend through a pad region where the display panel and the display panel driving circuit are connected.

[0021] In an example embodiment, the low power voltage supplier may include: a first voltage generating module, connected to a third end and a fourth end of the low power voltage wiring, and generating a low power voltage; a second voltage generating module, generating a test voltage; and a switch, connected between the second voltage generating module and the third end and the fourth end of the low power voltage wiring, and being turned off in a normal operation mode and turned on in a wiring disconnection detection mode.

[0022] In an example embodiment, the low power voltage supplier may include: a first voltage generating module that generates a low power voltage; a second voltage generating module that generates a test voltage; a first switch that is connected between the second voltage generating module and a third end and a fourth end of the low power voltage wiring, and is turned on in a normal operation mode and is turned off in a wiring disconnection detection mode; and a second switch that is connected between the first voltage generating module and the third end and the fourth end of the low power voltage wiring, and is turned off in the normal operation mode and is turned on in the wiring disconnection detection mode.

[0023] In example embodiments, the wiring disconnection determiner may be implemented in a display panel driving circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Features will become apparent to those skilled in the art by describing in detail example embodiments with reference to the accompanying drawings, in which:

[0025] Figures 1A to 1C A diagram showing a structure in which a low power voltage is applied to a display panel of an organic light emitting display device;

[0026] Figure 2 shows a block diagram of a wiring disconnection detection circuit according to an example embodiment;

[0027] Figure 3 Shown included in Figure 2 FIG. 1 is a diagram of an example in which a monitoring wiring in a wiring disconnection detection circuit is connected to a low-power voltage wiring extending along the periphery of a display panel;

[0028] Figure 4A and Figure 4B Show Description Figure 2 A diagram of the operation of a wiring disconnect detection circuit;

[0029] Figure 5 Shown included in Figure 2 A circuit diagram of an example of a low power voltage supply in a wiring disconnect detection circuit;

[0030] Figure 6 Shown included in Figure 2 A circuit diagram of another example of a low power voltage supply in a wiring disconnection detection circuit;

[0031] Figure 7 Shown included in Figure 2 FIG. 1 is a diagram of another example in which a monitoring wiring in a wiring disconnection detection circuit of a display panel is connected to a low-power voltage wiring extending along the periphery of a display panel;

[0032] Figure 8 Shown included in Figure 2 FIG. 1 is a diagram of another example in which a monitoring wiring in a wiring disconnection detection circuit of a display panel is connected to a low-power voltage wiring extending along the periphery of a display panel;

[0033] Fig. 9 A block diagram showing an organic light emitting display device according to example embodiments; and

[0034] Fig.10 A block diagram of an electronic device according to an example embodiment is shown. DETAILED DESCRIPTION

[0035] Example embodiments will now be described more fully below with reference to the accompanying drawings; however, they may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to make this disclosure thorough and complete and will fully convey example implementations to those skilled in the art. In the accompanying drawings, the dimensions of layers and regions may be exaggerated for clarity of illustration. The same reference numerals represent the same elements.

[0036] Figures 1A to 1C A diagram illustrating a structure in which a low power voltage is applied to a display panel of an organic light emitting display device. Figure 1B is along Figure 1A A cross-sectional view taken along line AA' in FIG.

[0037] refer to Figure 1AThe display panel 10 may be a part of an organic light emitting display device and may include a plurality of pixels, each pixel including an organic light emitting diode. Figure 1B , the pixels may receive the low power voltage ELVSS in common through the cathode layer 13 corresponding to the cathode of the organic light emitting diode. Figure 1A and Figure 1B As shown, the display panel 10 may have a structure in which when the low power voltage ELVSS ( Figure 5 and Figure 6 When the low power voltage ELVSS is applied to the low power voltage wiring 11 extending along the periphery of the display panel 10, the low power voltage ELVSS is commonly applied to the pixel through the cathode layer 13 connected to the low power voltage wiring 11 via the bridge pattern 12. Figure 1B As shown, in the display panel 10, an insulating layer 14 may be formed on the low power voltage wiring 11, the low power voltage wiring 11 may contact the bridge pattern 12 via a contact hole formed in the insulating layer 14, and the bridge pattern 12 may contact the cathode layer 13. Therefore, when the low power voltage ELVSS is applied to the low power voltage wiring 11, the low power voltage ELVSS may be transferred to the cathode layer 13 through the bridge pattern 12.

[0038] like Figure 1A and Figure 1C As shown, the low power voltage wiring 11 may extend through the pad area PAD-R, where the display panel 10 and the display panel driving circuit driving the display panel 10 are connected. The pad area PAD-R may be bent to place the display panel driving circuit behind the display panel 10. Since the pad area PAD-R is bent, the low power voltage wiring 11 may be disconnected at the pad area PAD-R (as indicated by “open circuit”). In this case, Figure 1C As shown, even when one path (or end) of the low-power voltage wiring 11 is disconnected (as indicated by "open circuit"), the low power voltage ELVSS can be transmitted through another path (or end) of the low-power voltage wiring 11 (as indicated by CRT), so that the display panel 10 can operate normally. However, when the current flows only through the other path of the low-power voltage wiring 11 (as indicated by CRT), the pixels located in the area near the other path of the low-power voltage wiring 11 (as indicated by DFR) will deteriorate rapidly over time due to overheating caused by the current flowing through the other path CRT of the low-power voltage wiring 11. Therefore, when one path of the low-power voltage wiring 11 is disconnected (as indicated by "open circuit"), even if the display panel 10 may initially appear to be operating normally, the display quality of the display panel 10 will deteriorate over time. In addition, it may be difficult to visually detect whether the low-power voltage wiring 11 is disconnected.

[0039] Figure 2 is a block diagram illustrating a wiring disconnection detection circuit according to an example embodiment, Figure 3 It is shown Figure 2 A diagram of an example in which a monitoring wiring included in a wiring disconnection detection circuit is connected to a low-power voltage wiring extending along the periphery of a display panel, and Figure 4A and Figure 4B Is used to describe Figure 2 A diagram showing how a wiring disconnection detection circuit detects whether a low-power voltage wiring extending along the periphery of a display panel is disconnected.

[0040] refer to Figures 2 to 4B , the wiring disconnection detection circuit 100 may include a low power voltage supplier (or a low power voltage supply unit) 120, a monitoring wiring 140, and a wiring disconnection determiner (or a wiring disconnection determination unit) 160. The low power voltage supplier 120 may be connected to both ends (hereinafter, referred to as a third end and a fourth end) of a low power voltage wiring 11 (e.g., a wiring through which a low power voltage ELVSS is transmitted) extending along the periphery of the display panel 10, and the monitoring wiring 140 may be connected to one point of the low power voltage wiring 11.

[0041] The low power voltage supplier 120 may supply the low power voltage ELVSS to the low power voltage wiring 11 in a normal operation mode of the display panel 10. The low power voltage supplier 120 may apply the low power voltage ELVSS to both ends of the low power voltage wiring 11 at the same time. Therefore, the low power voltage ELVSS may be commonly applied to the pixels included in the display panel 10 through the low power voltage wiring 11 (for example, the low power voltage wiring 11 may be formed to have a multilayer structure of Ti-Al-Ti), the bridge pattern 12 (for example, the bridge pattern 12 may be formed to have a multilayer structure of ITO-Ag-ITO), and the cathode layer 13 (for example, the cathode layer 13 may be formed to have a multilayer structure of Mg-Ag). Therefore, in the normal operation mode of the display panel 10, the display panel 10 may perform a display operation based on the low power voltage ELVSS, the high power voltage (ELVDD), and the data signal (for example, the data voltage) applied to each pixel. In an example embodiment, the low power voltage ELVSS may be a direct current (DC) voltage (for example, a constant voltage). In the wiring disconnection detection mode of the display panel 10, the low power voltage supplier 120 can supply the test voltage TV to the low power voltage wiring 11. The low power voltage supplier 120 can simultaneously apply the test voltage TV to both ends of the low power voltage wiring 11. In an exemplary embodiment, the test voltage TV can be an alternating current (AC) voltage (e.g., a clock pulse voltage). In an exemplary embodiment, the low power voltage supplier 120 can be implemented in the display panel driving circuit 20 that drives the display panel 10.

[0042] The monitoring wiring 140 may include a first end connected to a point of the low power voltage wiring 11 and a second end at which a feedback voltage FV corresponding to the test voltage TV is output in a wiring disconnection detection mode of the display panel 10. Therefore, the monitoring wiring 140 may be located between a point of the low power voltage wiring 11 and the wiring disconnection determiner 160. For example, Figure 3 As shown, the point where the monitoring wiring 140 is connected to the low power voltage wiring 11 may be a point separated from both ends (i.e., the third end and the fourth end) of the low power voltage wiring 11 by the same distance. In this case, the resistance R1 between the point and the third end of the low power voltage wiring 11 may be equal to the resistance R2 between the point and the fourth end of the low power voltage wiring 11. In addition, as Figure 3 As shown, the monitoring wiring 140 may extend along the periphery of the display panel 10. The low power voltage wiring 11 and the monitoring wiring 140 may have resistances R1, R2, and R3, and therefore, compared to the test voltage TV, there may be an RC delay in the feedback voltage FV generated after the test voltage TV applied to the low power voltage wiring 11 in the wiring disconnection detection mode of the display panel 10 passes through the low power voltage wiring 11 and the monitoring wiring 140.

[0043] The wiring disconnection determiner 160 may receive the feedback voltage FV from the second end of the monitoring wiring 140 (i.e., the wiring disconnection determiner 160 is connected to the second end of the monitoring wiring 140), may measure the RC delay of the feedback voltage FV, may determine that the low power voltage wiring 11 is disconnected when the RC delay of the feedback voltage FV is greater than a reference value, and may determine that the low power voltage wiring 11 is not disconnected when the RC delay of the feedback voltage FV is not greater than the reference value. In an example embodiment, the RC delay of the feedback voltage FV may be measured based on the rise time of the feedback voltage FV corresponding to the test voltage TV. Thus, because the rise time of the feedback voltage FV is relatively long when the RC delay of the feedback voltage FV is relatively large, and because the rise time of the feedback voltage FV is relatively short when the RC delay of the feedback voltage FV is relatively small, the RC delay of the feedback voltage FV may be measured based on the rise time of the feedback voltage FV corresponding to the test voltage TV. In this case, when the rise time of the feedback voltage FV corresponding to the test voltage TV is longer than the reference time, the wiring disconnection determiner 160 may determine that the low power voltage wiring 10 extending along the periphery of the display panel 10 is disconnected. On the other hand, when the rising time of the feedback voltage FV corresponding to the test voltage TV is not longer than the reference time, the wiring disconnection determiner 160 may determine that the low power voltage wiring 11 extending along the periphery of the display panel 10 is not disconnected. Figure 3 As shown in , the wiring disconnection determiner 160 may be implemented in the display panel driving circuit 20 .

[0044] exist Figure 4A In the case shown in , the low power voltage wiring 11 is not disconnected. In this case, when the test voltage TV is supplied to the third and fourth ends of the low power voltage wiring 11, the resistance R1 (between the third end of the low power voltage wiring 11 and the point where the monitoring wiring 140 is connected) can be connected in parallel with the resistance R2 (between the fourth end of the low power voltage wiring 11 and the point where the monitoring wiring 140 is connected). Therefore, the total resistance of the low power voltage wiring 11 can be calculated as (R1×R2) / (R1+R2). In addition, the total resistance (R1×R2) / (R1+R2) of the low power voltage wiring 11 can be connected in series with the resistance R3 of the monitoring wiring 140. Therefore, the total wiring resistance of the low power voltage wiring 11 and the monitoring wiring 140 can be calculated as R3+((R1×R2) / (R1+R2)). Therefore, when the low power voltage wiring 11 is not disconnected, the feedback voltage FV (as Figure 4A The RC delay of FV1 in FIG. 1 may be smaller than the feedback voltage FV (indicated by FV1 in FIG. 1 ) when the low power voltage wiring 11 is disconnected. Figure 4B RC delay of the feedback voltage FV2 in the test voltage TV). As described above, when the rising time of the feedback voltage FV corresponding to the test voltage TV is longer than the reference time, the wiring disconnection determiner 160 can determine that the low power voltage wiring 11 extending along the periphery of the display panel 10 is disconnected, and when the rising time of the feedback voltage FV corresponding to the test voltage TV is not longer than the reference time, it can be determined that the low power voltage wiring 11 extending along the periphery of the display panel 10 is not disconnected. Therefore, the wiring disconnection determiner 160 can set the reference time to be longer than the rising time RT1 of the feedback voltage FV1 corresponding to the test voltage TV by a specific time. Therefore, because the rising time RT1 of the feedback voltage FV1 is shorter than the reference time, the rising time RT1 of the feedback voltage FV1 can indicate that the low power voltage wiring 11 is not disconnected.

[0045] In another case, if Figure 4B As shown, the low power voltage wiring 11 (as indicated by "open circuit") may be disconnected. In this case, when the test voltage TV is supplied to the third and fourth ends of the low power voltage wiring 11, the total resistance of the low power voltage wiring 11 may be the resistance R1 between the third end of the low power voltage wiring 11 and the point to which the monitoring wiring 140 is connected. In addition, the total resistance R1 of the low power voltage wiring 11 may be connected in series with the resistance R3 of the monitoring wiring 140. Therefore, the total wiring resistance of the low power voltage wiring 11 and the monitoring wiring 140 may be calculated as R3+R1. Here, because the resistance (R3+R1) is greater than the resistance R3+((R1×R2) / (R1+R2)), the feedback voltage FV (as indicated by "open circuit") is greater than the resistance R3+((R1×R2) / (R1+R2)) when the low power voltage wiring 11 is disconnected. Figure 4BThe RC delay of the feedback voltage FV (indicated by FV2 in FIG. 1 ) may be greater than the feedback voltage FV (indicated by FV2 in FIG. 1 ) when the low power voltage wiring 11 is not disconnected. Figure 4A RC delay of the feedback voltage FV1 in the test voltage TV). As described above, when the rising time of the feedback voltage FV corresponding to the test voltage TV is longer than the reference time, the wiring disconnection determiner 160 can determine that the low power voltage wiring 11 extending along the periphery of the display panel 10 is disconnected, and when the rising time of the feedback voltage FV corresponding to the test voltage TV is not longer than the reference time, it can be determined that the low power voltage wiring 11 extending along the periphery of the display panel 10 is not disconnected. Therefore, the wiring disconnection determiner 160 can set the reference time to be longer than the rising time RT1 of the feedback voltage FV1 corresponding to the test voltage TV by a specific time. Therefore, when the rising time RT2 of the feedback voltage FV2 is longer than the reference time, the rising time RT2 of the feedback voltage FV2 can indicate that the low power voltage wiring 11 is disconnected.

[0046] The wiring disconnection detection circuit 100 can accurately detect whether the low power voltage wiring 11 extending along the periphery of the display panel 10 is disconnected in a simple manner through the following steps: supplying a test voltage TV to the low power voltage wiring 11, receiving a feedback voltage FV corresponding to the test voltage TV through a monitoring wiring 140 connected to a point of the low power voltage wiring 11, measuring an RC delay of the feedback voltage FV, and determining that the low power voltage wiring 11 is disconnected when the RC delay of the feedback voltage FV is greater than a reference value in a wiring disconnection detection mode of the display panel 10. Therefore, the organic light emitting display device including the wiring disconnection detection circuit 100 can detect defects (e.g., degradation of display quality, etc.) caused by wiring disconnection of the low power voltage wiring 11 extending along the periphery of the display panel 10 at an early stage.

[0047] Figure 5 Shown included in Figure 2 A circuit diagram of an example of a wiring disconnection detection circuit in a low power voltage supply.

[0048] refer to Figure 5, the low power voltage supplier 120A may include a first voltage generating module 121, a second voltage generating module 122, and a switch 123. For example, the first voltage generating module 121 may be connected to both ends (i.e., the third end and the fourth end) of the low power voltage wiring 11 extending along the periphery of the display panel 10. The first voltage generating module 121 may generate a low power voltage ELVSS. The low power voltage ELVSS may be a DC voltage (e.g., a constant voltage), and the first voltage generating module 121 may be a DC voltage source. The second voltage generating module 122 may generate a test voltage TV. The test voltage TV may be an AC voltage (e.g., a clock pulse voltage), and the second voltage generating module 122 may be an AC voltage source. In an example embodiment, the second voltage generating module 122 may be a DC-AC inverter. The switch 123 may be connected between the second voltage generating module 122 and the third end and the fourth end of the low power voltage wiring 11. The switch 123 may be turned off in the normal operation mode of the display panel 10 and may be turned on in the wiring disconnection detection mode of the display panel 10. Therefore, since the switch 123 is turned off in the normal operation mode of the display panel 10, only the low power voltage ELVSS generated by the first voltage generating module 121 can be applied to the low power voltage wiring 11. On the other hand, since the switch 123 is turned on in the wiring disconnection detection mode of the display panel 10, both the low power voltage ELVSS generated by the first voltage generating module 121 and the test voltage TV generated by the second voltage generating module 122 can be applied to the low power voltage wiring 11. As described above, the low power voltage supplier 120A can supply the low power voltage ELVSS to the low power voltage wiring 11 in the normal operation mode of the display panel 10, and can supply both the low power voltage ELVSS and the test voltage TV to the low power voltage wiring 11 in the wiring disconnection detection mode of the display panel 10.

[0049] Figure 6 Shown included in Figure 2 A circuit diagram of another example of a low power voltage supply in a wiring disconnection detection circuit.

[0050] refer to Figure 6, the low power voltage supplier 120B may include a first voltage generating module 124, a second voltage generating module 125, a first switch 126, and a second switch 127. For example, the first voltage generating module 124 may generate a low power voltage ELVSS. The low power voltage ELVSS may be a DC voltage (e.g., a constant voltage), and the first voltage generating module 124 may be a DC voltage source. The second voltage generating module 125 may generate a test voltage TV. The test voltage TV may be an AC voltage (e.g., a clock pulse voltage), and the second voltage generating module 125 may be an AC voltage source. In an example embodiment, the second voltage generating module 125 may be a DC-AC inverter. The first switch 126 may be connected between the first voltage generating module 124 and the third and fourth ends of the low power voltage wiring 11. The first switch 126 may be turned on in a normal operation mode of the display panel 10, and may be turned off in a wiring disconnection detection mode of the display panel 10. The second switch 127 may be connected between the second voltage generating module 125 and the third and fourth ends of the low power voltage wiring 11. The second switch 127 may be turned off in the normal operation mode of the display panel 10, and may be turned on in the wiring disconnection detection mode of the display panel 10. Therefore, since the first switch 126 is turned on and the second switch 127 is turned off in the normal operation mode of the display panel 10, only the low power voltage ELVSS generated by the first voltage generating module 124 may be applied to the low power voltage wiring 11. On the other hand, since the first switch 126 is turned off and the second switch 127 is turned on in the wiring disconnection detection mode of the display panel 10, only the test voltage TV generated by the second voltage generating module 125 may be applied to the low power voltage wiring 11. As described above, the low power voltage supplier 120B may supply the low power voltage ELVSS to the low power voltage wiring 11 in the normal operation mode of the display panel 10, and may supply the test voltage TV to the low power voltage wiring 11 in the wiring disconnection detection mode of the display panel 10.

[0051] Figure 7 Shown included in Figure 2 A diagram of another example in which a monitoring wiring in a wiring disconnection detection circuit is connected to a low-power voltage wiring extending along the periphery of a display panel, and Figure 8 It shows that the Figure 2 FIG. 1 is a diagram of another example in which a monitoring wiring in a wiring disconnection detection circuit is connected to a low-power voltage wiring extending along the periphery of a display panel.

[0052] refer to Figure 7 and Figure 8The monitoring wiring 140 may include a first end connected to a point of the low power voltage wiring 11 and a second end at which a feedback voltage FV corresponding to the test voltage TV is output in the wiring disconnection detection mode of the display panel 10. Therefore, the monitoring wiring 140 may be located between a point of the low power voltage wiring 11 and the wiring disconnection determiner 160 located in the display panel driving circuit 20. For example, Figure 7 and Figure 8 As shown, the point at which the monitoring wiring 140 is connected to the low power voltage wiring 11 may be a connection point separated from both ends of the low power voltage wiring 11 by different distances. For example, when the average cross-sectional area between the connection point and the third end (e.g., the left end) of the low power voltage wiring 11 is smaller than the average cross-sectional area between the connection point and the fourth end (e.g., the right end) of the low power voltage wiring 11, the length between the connection point and the third end of the low power voltage wiring 11 may be shorter than the length between the connection point and the fourth end of the low power voltage wiring 11, and thus the resistance between the connection point and the third end of the low power voltage wiring 11 may still be equal to the resistance between the connection point and the fourth end of the low power voltage wiring 11. As described above, the point at which the monitoring wiring 140 is connected to the low power voltage wiring 11 may be determined by considering the resistance distribution of the low power voltage wiring 11. In another embodiment, the point at which the monitoring wiring 140 is connected to the low power voltage wiring 11 may be determined by considering the position of the low power voltage wiring 11 that is easy to disconnect.

[0053] Fig. 9 is a block diagram illustrating an organic light emitting display device according to example embodiments.

[0054] refer to Fig. 9 , the organic light emitting display device 300 may include a display panel 320, a display panel driving circuit 340, and a wiring disconnection detection circuit 360. Fig. 9 As shown in , for ease of description, the wiring disconnection detection circuit 360 is separated from the display panel 320 and the display panel driving circuit 340 , but various components of the wiring disconnection detection circuit 360 may be located in the display panel 320 and / or the display panel driving circuit 340 .

[0055] The display panel 320 may include a plurality of pixels 321. The pixels 321 may be arranged in the display panel 320 in various forms (e.g., a matrix form, etc.). The display panel 320 may have a structure in which, when a low power voltage ELVSS is applied to a low power voltage wiring, the low power voltage ELVSS is commonly applied to the pixels 321 through a cathode layer connected to the low power voltage wiring (which extends along the periphery of the display panel 320) through a bridge pattern. The display panel driving circuit 340 may drive the display panel 320. In an example embodiment, the display panel driving circuit 340 may include a scan driver, a data driver, a power management integrated circuit, and a timing controller. The display panel 320 may be connected to the scan driver via a plurality of scan lines. The display panel 320 may be connected to the data driver via a plurality of data lines. The scan driver may provide a scan signal SS to the pixels 321 included in the display panel 320 via the scan lines. The data driver may provide a data signal DS to the pixels 321 included in the display panel 320 via the data lines. The power management integrated circuit may provide various voltages required to drive the display panel 320. The timing controller may generate and provide a plurality of control signals to the scan driver and the data driver to control the scan driver and the data driver. In an example embodiment, the timing controller may perform a given process (e.g., a degradation compensation process, etc.) on the data signal DS input from the external component. In an example embodiment, the display panel driving circuit 340 may further include an emission control driver. In this case, the emission control driver may be connected to the display panel 320 via a plurality of emission control lines. The emission control driver may provide an emission control signal to the pixel 321 included in the display panel 320 via the emission control line.

[0056] The wiring disconnection detection circuit 360 may provide a test voltage TV to the low power voltage wiring, may receive a feedback voltage FV corresponding to the test voltage TV through a monitoring wiring connected to a point of the low power voltage wiring, and may detect whether the low power voltage wiring is disconnected based on the RC delay of the feedback voltage FV in the wiring disconnection detection mode of the display panel 320. The low power voltage ELVSS may be a constant voltage, and the test voltage TV may be a clock pulse voltage. In the normal operation mode of the display panel 320, the wiring disconnection detection circuit 360 may apply the low power voltage ELVSS to the low power voltage wiring extending along the periphery of the display panel 320. In an example embodiment, the wiring disconnection detection circuit 360 may include a low power voltage supplier, a monitoring wiring, and a wiring disconnection determiner. The low power voltage supplier may provide the low power voltage ELVSS to the low power voltage wiring in the normal operation mode of the display panel 320, and may provide the test voltage TV to the low power voltage wiring in the wiring disconnection mode of the display panel 320. The monitoring wiring may include a first end connected to a point of the low power voltage wiring and a second end at which a feedback voltage FV corresponding to the test voltage TV is output in a wiring disconnection mode of the display panel 320. The wiring disconnection determiner may receive the feedback voltage FV from the second end of the monitoring wiring (i.e., may be connected to the second end of the monitoring wiring), may measure the RC delay of the feedback voltage FV, and may determine that the low power voltage wiring is disconnected when the RC delay of the feedback voltage FV is greater than a predetermined reference value. As described above, the RC delay of the feedback voltage FV may be measured based on the rise time of the feedback voltage FV corresponding to the test voltage TV. In addition, when the rise time of the feedback voltage FV is greater than the reference time, it may be determined that the low power voltage wiring is disconnected.

[0057] In an example embodiment, a low power voltage supplier may be implemented in the display panel drive circuit 340. The monitoring wiring may extend along the periphery of the display panel 320. The wiring disconnection determiner may be implemented in the display panel drive circuit 340. The low power voltage wiring and the monitoring wiring extending along the periphery of the display panel 320 may extend via the pad area where the display panel 320 and the display panel drive circuit 340 are connected. Therefore, the second end of the monitoring wiring may be connected to the wiring disconnection determiner implemented in the display panel drive circuit 340, and the two ends (i.e., the third end and the fourth end) of the low power voltage wiring may be connected to the low power voltage supplier implemented in the display panel drive circuit 340. Therefore, the low power voltage ELVSS and the test voltage TV may be applied to the low power voltage wiring through the two ends of the low power voltage wiring; and the feedback voltage FV corresponding to the test voltage TV may be applied to the wiring disconnection determiner through the second end of the monitoring wiring. In an example embodiment, the low power voltage supplier may include a first voltage generation module, a second voltage generation module, and a switch. The first voltage generation module may be connected to the third end and the fourth end of the low power voltage wiring. The first voltage generating module may generate a low power voltage ELVSS. The second voltage generating module may generate a test voltage TV. The switch may be connected between the second voltage generating module and the third and fourth ends of the low power voltage wiring. The switch may be turned off in the normal operation mode of the display panel 320, and may be turned on in the wiring disconnection detection mode of the display panel 320. In another example embodiment, the low power voltage source may include a first switch voltage generating module, a second voltage generating module, a first switch, and a second switch. The first voltage generating module may generate a low power voltage ELVSS. The second voltage generating module may generate a test voltage TV. The first switch may be connected between the first voltage generating module and the third and fourth ends of the low power voltage wiring. The first switch may be turned on in the normal operation mode of the display panel 320, and may be turned off in the wiring disconnection detection mode of the display panel 320. The second switch may be connected between the second voltage generating module and the third and fourth ends of the low power voltage wiring. The second switch may be turned off in the normal operation mode of the display panel 320, and may be turned on in the wiring disconnection detection mode of the display panel 320. These may be referred to above. Figure 5 and Figure 6 Same as described.

[0058] The organic light-emitting display device 300 can provide early detection of defects (e.g., degradation of display quality, etc.) caused by wiring disconnection of low-power voltage wiring extending along the periphery of the display panel 320 by including a wiring disconnection detection circuit 360 that can accurately detect whether the low-power voltage wiring is disconnected in a simple manner. For example, when the organic light-emitting display device 300 has a structure in which the display panel drive circuit 340 is placed behind the display panel 320, it can be accurately determined whether the low-power voltage wiring is disconnected, wherein when the pad area where the display panel 320 and the display panel drive circuit 340 are connected is bent during the manufacturing process of the organic light-emitting display device 300, the wiring disconnection of the low-power voltage wiring may be caused. Therefore, for example, the organic light-emitting display device 300 having defects due to wiring disconnection of the low-power voltage wiring can be prevented from being shipped.

[0059] Fig.10 is a block diagram illustrating an electronic device according to an example embodiment.

[0060] refer to Fig.10 , the electronic device 500 may include a processor 510, a memory device 520, a storage device 530, an input / output (I / O) device 540, a power supply 550, and a display device such as an organic light emitting display device (OLED device) 560. The organic light emitting display device 560 may be, for example Fig. 9 The electronic device 500 may include a plurality of ports for communicating with a video card, a sound card, a memory card, a universal serial bus (USB) device, other electronic devices, etc. For example, the electronic device 500 may be implemented as a smart phone, a cellular phone, a video phone, a smart tablet, a smart watch, a tablet computer, a car navigation system, a computer monitor, a notebook computer, a digital camera, etc.

[0061] The processor 510 may perform various computing functions. The processor 510 may be a microprocessor, a central processing unit (CPU), an application processor (AP), etc. The processor 510 may be coupled to other components via an address bus, a control bus, a data bus, etc. In addition, the processor 510 may be coupled to an expansion bus such as a peripheral component interconnect (PCI) bus. The memory device 520 may store data for the operation of the electronic device 500. For example, the memory device 520 may include at least one nonvolatile memory device such as an erasable programmable read-only memory (EPROM) device, an electrically erasable programmable read-only memory (EEPROM) device, a flash memory device, a phase change random access memory (PRAM) device, a resistive random access memory (RRAM) device, a nano floating gate memory (NFGM) device, a polymer random access memory (PoRAM) device, a magnetic random access memory (MRAM) device, a ferroelectric random access memory (FRAM) device, etc.; and / or at least one volatile memory device such as a dynamic random access memory (DRAM) device, a static random access memory (SRAM) device, a mobile DRAM device, etc. The storage device 530 may include a solid state drive (SSD) device, a hard disk drive (HDD) device, a CD-ROM device, etc. The I / O device 540 may include an input device such as a keyboard, a keypad, a mouse device, a touch pad, a touch screen, etc.; and an output device such as a printer, a speaker, etc. In some example embodiments, the organic light emitting display device 560 may be included in the I / O device 540. The power supply 550 may provide power for the operation of the electronic device 500 .

[0062] The organic light emitting display device 560 can be coupled to other components via a bus or other communication links. The organic light emitting display device 560 can detect defects caused by the disconnection of the wiring of the low power voltage wiring extending along the periphery of the display panel at an early stage. For this operation, the organic light emitting display device 560 may include a display panel, a display panel driving circuit, and a wiring disconnection detection circuit. The display panel may have a structure in which the low power voltage is applied to the low power voltage wiring via a cathode layer connected to the low power voltage wiring through a bridge pattern to apply to multiple pixels. The display panel driving circuit may drive the display panel. The wiring disconnection detection circuit may supply a test voltage to the low power voltage wiring, may receive a feedback voltage corresponding to the test voltage through a monitoring wiring connected to a point of the low power voltage wiring, and may detect whether the low power voltage wiring is disconnected based on the RC delay of the feedback voltage in the wiring disconnection detection mode of the display panel. In an example embodiment, the wiring disconnection detection circuit may include a low power voltage supplier, a monitoring wiring, and a wiring disconnection determiner. The low power voltage supplier can supply a low power voltage to the low power voltage wiring in the normal operation mode of the display panel, and can supply a test voltage to the low power voltage wiring in the wiring disconnection detection mode. The monitoring wiring may include a first end connected to a point of the low power voltage wiring and a second end at which a feedback voltage is output in the wiring disconnection detection mode of the display panel. The wiring disconnection determiner can receive a feedback voltage from the second end of the monitoring wiring, can measure the RC delay of the feedback voltage, and can determine that the low power voltage wiring is disconnected when the RC delay of the feedback voltage is greater than a predetermined reference value. Therefore, the wiring disconnection detection circuit can accurately detect whether the low power voltage wiring extending along the periphery of the display panel is disconnected in a simple manner. The wiring disconnection detection circuit has been described above.

[0063] Example embodiments may be applied to organic light emitting display devices and electronic devices including organic light emitting display devices. For example, example embodiments may be applied to cellular phones, smart phones, video phones, smart tablets, smart watches, tablet computers, car navigation systems, computer monitors, laptop computers, digital cameras, etc.

[0064] As described above, embodiments relate to a wiring disconnection detection circuit for detecting whether a low-power voltage wiring extending along the periphery of a display panel (e.g., a wiring through which a low-power voltage ELVSS is transmitted) is disconnected, and a display device including the wiring disconnection detection circuit, such as an organic light-emitting display device. Embodiments may provide a wiring disconnection detection circuit that is capable of effectively detecting whether a low-power voltage wiring extending along the periphery of a display panel is disconnected. Embodiments may provide an organic light-emitting display device including the wiring disconnection detection circuit.

[0065] The wiring disconnection detection circuit according to the example embodiment can accurately detect whether the low power voltage wiring extending along the periphery of the display panel is disconnected in the following simple manner through the following steps: supplying a test voltage to the low power voltage wiring, receiving a feedback voltage corresponding to the test voltage through a monitoring wiring connected to a point of the low power voltage wiring, measuring the RC delay of the feedback voltage, and determining that the low power voltage wiring is disconnected when the RC delay of the feedback voltage is greater than a predetermined reference value in a wiring disconnection detection mode of the display panel.

[0066] Furthermore, an organic light emitting display device including a wiring disconnection detection circuit according to example embodiments may provide early detection of defects (eg, degradation of display quality, etc.) caused by disconnection of a low power voltage wiring extending along the periphery of a display panel.

[0067] Exemplary embodiments have been disclosed herein, and although specific terms are used, they are used and interpreted in a general and descriptive sense only and not for purposes of limitation. In some cases, as will be apparent to those skilled in the art, unless otherwise expressly indicated, when this application is filed, features, characteristics and / or elements described in connection with a specific embodiment may be used alone or in combination with features, characteristics and / or elements described in connection with other embodiments. Therefore, it should be understood by those skilled in the art that various changes in form and detail may be made without departing from the spirit and scope of the present invention as set forth in the following claims.

Claims

1. A wiring disconnection detection circuit, wherein: The wiring disconnection detection circuit comprises: a low power voltage supplier that supplies a low power voltage to a low power voltage wiring extending along a periphery of the display panel in a normal operation mode of the display panel and supplies a test voltage to the low power voltage wiring in a wiring disconnection detection mode of the display panel; a monitoring wiring including a first end connected to a point of the low power voltage wiring and a second end at which a feedback voltage corresponding to the test voltage is output in the wiring disconnection detection mode; and a wiring disconnection determiner that receives the feedback voltage from the second terminal, measures an RC delay of the feedback voltage, and determines that the low power voltage wiring is disconnected when the RC delay is greater than a predetermined reference value, Wherein, the low power voltage is a constant voltage, and the test voltage is a clock pulse voltage.

2. The wiring disconnection detection circuit according to claim 1, wherein: The RC delay is measured based on a rise time of the feedback voltage corresponding to the test voltage.

3. The wiring disconnection detection circuit according to claim 2, wherein: When the rising time of the feedback voltage is greater than a predetermined reference time, the wiring disconnection determiner determines that the low power voltage wiring is disconnected.

4. The wiring disconnection detection circuit according to claim 1, wherein: The low power voltage wiring includes a third terminal and a fourth terminal connected to the low power voltage supplier, and the low power voltage and the test voltage are applied to the low power voltage wiring through the third terminal and the fourth terminal.

5. The wiring disconnection detection circuit according to claim 4, wherein: The low power voltage supplier is implemented in a display panel driving circuit that drives the display panel, and the low power voltage wiring extends through a pad region where the display panel and the display panel driving circuit are connected.

6. The wiring disconnection detection circuit according to claim 4, characterized in that: The low power voltage supply comprises: a first voltage generating module connected to the third end and the fourth end of the low power voltage wiring and generating a low power voltage; A second voltage generating module, generating the test voltage; and A switch is connected between the second voltage generating module and the third end and the fourth end of the low power voltage wiring, the switch being turned off in the normal operation mode and turned on in the wiring disconnection detection mode.

7. The wiring disconnection detection circuit according to claim 6, wherein: The second voltage generating module is a DC-AC inverter.

8. The wiring disconnection detection circuit according to claim 4, wherein: The low power voltage supply comprises: A first voltage generating module, generating the low power voltage; A second voltage generating module, generating the test voltage; a first switch connected between the first voltage generating module and the third end and the fourth end of the low power voltage wiring, the first switch being turned on in the normal operation mode and turned off in the wiring disconnection detection mode; and A second switch is connected between the second voltage generating module and the third end and the fourth end of the low power voltage wiring, the second switch being turned off in the normal operation mode and turned on in the wiring disconnection detection mode.

9. The wiring disconnection detection circuit according to claim 8, wherein: The second voltage generating module is a DC-AC inverter.

10. An organic light emitting display device, wherein: The organic light emitting display device comprises: a display panel, wherein when a low power voltage is applied to a low power voltage wiring extending along a periphery of the display panel, the low power voltage is commonly applied to a plurality of pixels via a cathode layer connected to the low power voltage wiring through a bridge pattern; A display panel driving circuit, driving the display panel; and a wiring disconnection detection circuit that supplies a test voltage to the low power voltage wiring, receives a feedback voltage corresponding to the test voltage through a monitoring wiring connected to one point of the low power voltage wiring, and detects whether the low power voltage wiring is disconnected based on an RC delay of the feedback voltage in a wiring disconnection detection mode of the display panel, Wherein, the wiring disconnection detection circuit comprises: a low power voltage supplier that supplies the low power voltage to the low power voltage wiring in a normal operation mode of the display panel and supplies the test voltage to the low power voltage wiring in the wiring disconnection detection mode; a monitoring wiring including a first terminal connected to the point of the low power voltage wiring and a second terminal at which the feedback voltage is output in the wiring disconnection detection mode; and a wiring disconnection determiner that receives the feedback voltage from the second terminal, measures the RC delay, and determines that the low power voltage wiring is disconnected when the RC delay is greater than a predetermined reference value, Wherein, the low power voltage is a constant voltage, and the test voltage is a clock pulse voltage.

11. The organic light emitting display device according to claim 10, wherein: The RC delay is measured based on a rise time of the feedback voltage corresponding to the test voltage.

12. The organic light emitting display device according to claim 11, wherein: When the rising time of the feedback voltage is greater than a predetermined reference time, the wiring disconnection determiner determines that the low power voltage wiring is disconnected.

13. The organic light emitting display device according to claim 10, wherein: The low power voltage wiring includes a third terminal and a fourth terminal connected to the low power voltage supplier, and the low power voltage and the test voltage are applied to the low power voltage wiring through the third terminal and the fourth terminal.

14. The organic light emitting display device according to claim 13, wherein: The low power voltage supplier is implemented in the display panel driving circuit, and the low power voltage wiring extends through a pad area where the display panel and the display panel driving circuit are connected.

15. The organic light emitting display device according to claim 14, wherein: The low power voltage supply comprises: a first voltage generating module connected to the third end and the fourth end of the low power voltage wiring and generating a low power voltage; A second voltage generating module, generating the test voltage; and A switch is connected between the second voltage generating module and the third end and the fourth end of the low power voltage wiring, the switch being turned off in the normal operation mode and turned on in the wiring disconnection detection mode.

16. The organic light emitting display device according to claim 14, wherein: The low power voltage supply comprises: A first voltage generating module, generating the low power voltage; A second voltage generating module, generating the test voltage; a first switch connected between the first voltage generating module and the third end and the fourth end of the low power voltage wiring, the first switch being turned on in the normal operation mode and turned off in the wiring disconnection detection mode; and A second switch is connected between the second voltage generating module and the third end and the fourth end of the low power voltage wiring, the second switch being turned off in the normal operation mode and turned on in the wiring disconnection detection mode.

17. The organic light emitting display device according to claim 13, wherein: The wiring disconnection determiner is implemented in the display panel driving circuit.

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