| CPC G09G 3/3225 (2013.01) [G09G 3/006 (2013.01); H05K 1/189 (2013.01); H10K 50/868 (2023.02); G09G 2330/021 (2013.01); H05K 2201/10128 (2013.01)] | 5 Claims |
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1. A display module, comprising:
a display panel;
a power supply driver configured to generate a driving voltage;
a chip-on-film circuit board, the chip-on-film circuit board including: a substrate, and a first connection electrode and a second connection electrode that are located on the substrate, the first connection electrode being connected to the display panel;
a voltage signal line connected between the display panel and the power supply driver, and configured to transmit the driving voltage generated by the power supply driver to the display panel, so that the display panel emits light, wherein the voltage signal line includes: a first conductive portion located on the substrate and connected between the first connection electrode and the second connection electrode; and a second conductive portion connected between the second connection electrode and the power supply driver;
a sampling resistor connected in series with the voltage signal line, wherein the sampling resistor is connected with the second conductive portion, and the resistance of the sampling resistor is within a range of 1 mΩ to 2 mΩ;
a detection and control circuit connected to two ends of the sampling resistor, and configured to detect a voltage across the sampling resistor;
a main control circuit board, wherein the power supply driver and the detection and control circuit are located on the main control circuit board; and
a flexible circuit board connected between the main control circuit board and the second connection electrode, wherein the second conductive portion and the sampling resistor are located on the flexible circuit board, wherein
the detection and control circuit is further connected to the power supply driver, and is further configured to perform controlling the power supply driver to generate a driving voltage equal to a preset value lower than a voltage threshold in a case where the detection and control circuit determines that the voltage across the sampling resistor is greater than or equal to the voltage threshold, wherein the voltage threshold is within a range of 1 mV to 2 mV; and
the detection and control circuit includes:
a subtractor circuit connected to the two ends of the sampling resistor, and configured to obtain potentials at the two ends of the sampling resistor, and calculate a difference between the potentials at the two ends of the sampling resistor according to the potentials at the two ends of the sampling resistor, wherein the difference is the voltage across the sampling resistor;
a comparator circuit connected to the subtractor circuit, and configured to obtain the voltage across the sampling resistor calculated by the subtractor circuit, and compare the voltage across the sampling resistor with the voltage threshold to obtain a comparison result; and
a logic controller connected to the comparator circuit and the power supply driver, and configured to obtain the comparison result of the comparator circuit, and control the power supply driver to generate the driving voltage equal to the preset value lower than the voltage threshold in a case where the comparison result is that the voltage across the sampling resistor is greater than or equal to the voltage threshold.
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