US 12,307,930 B2
Scan-type display apparatus capable of short circuit detection, and scan driver thereof
Chi-Min Hsieh, Hsinchu (TW); Che-Wei Chang, Hsinchu (TW); Chen-Yuan Kuo, Hsinchu (TW); and Wei-Hsiang Cheng, Hsinchu (TW)
Assigned to MACROBLOCK, INC., Hsinchu (TW)
Filed by MACROBLOCK, INC., Hsinchu (TW)
Filed on Dec. 5, 2022, as Appl. No. 18/074,832.
Claims priority of application No. 110147452 (TW), filed on Dec. 17, 2021.
Prior Publication US 2023/0196957 A1, Jun. 22, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G09G 3/00 (2006.01); G01R 19/10 (2006.01); G01R 31/52 (2020.01); G09G 3/32 (2016.01)
CPC G09G 3/006 (2013.01) [G01R 19/10 (2013.01); G01R 31/52 (2020.01); G09G 3/32 (2013.01); G09G 2310/0267 (2013.01); G09G 2320/0233 (2013.01); G09G 2330/021 (2013.01); G09G 2330/08 (2013.01); G09G 2330/12 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A scan-type display apparatus comprising:
a light emitting diode (LED) array having a common cathode configuration, and including
a plurality of scan lines,
a plurality of data lines, and
a plurality of LEDs arranged in a matrix that has a plurality of rows respectively corresponding to said scan lines and a plurality of columns respectively corresponding to said data lines,
with respect to each of said rows, cathodes of said LEDs in said row being connected to said scan line that corresponds to said row,
with respect to each of said columns, anodes of said LEDs in said column being connected to said data line that corresponds to said column; and
a scan driver including a plurality of scan driving circuits that respectively correspond to said scan lines, each of said scan driving circuits including
a voltage generator having an output terminal that is connected to said scan line corresponding to said scan driving circuit, and configured to output one of a common voltage and a clamp voltage at said output terminal of said voltage generator, and
a detector connected to said output terminal of said voltage generator to receive a voltage at said output terminal of said voltage generator, further receiving a detection timing signal, and generating a detection signal that indicates whether any one of said LEDs connected to said scan line corresponding to said scan driving circuit is short circuited based on the voltage at said output terminal of said voltage generator and the detection timing signal;
wherein, with respect to each of said scan driving circuits, said voltage generator includes
a scan switch having a first terminal that receives the common voltage, a second terminal that is connected to said output terminal of said voltage generator, and a control terminal that receives a scan signal,
a voltage regulator generating the clamp voltage, and
a clamp switch having a first terminal that is connected to said voltage regulator to receive the clamp voltage, a second terminal that is connected to said output terminal of said voltage generator, and a control terminal that receives a clamp signal; and
wherein, with respect to each of said scan driving circuits,
said voltage regulator is further connected to said detector to receive the detection signal, and generates a control signal based on the detection signal,
said voltage generator further includes an intermediate switch that is connected between said voltage regulator and said first terminal of said clamp switch, and
said intermediate switch has a first terminal that is connected to said voltage regulator to receive the clamp voltage, a second terminal that is connected to said first terminal of said clamp switch, and a control terminal that is connected to said voltage regulator to receive the control signal.