| CPC G09G 3/3258 (2013.01) [G09G 3/3233 (2013.01); G09G 3/3266 (2013.01); G09G 3/3275 (2013.01); G09G 3/3291 (2013.01); G09G 2300/043 (2013.01); G09G 2300/0819 (2013.01); G09G 2310/0251 (2013.01); G09G 2320/0233 (2013.01); G09G 2320/045 (2013.01)] | 15 Claims |
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1. A pixel driving circuit, comprising: a driving module, a data writing module, an initialization module, a first capacitor, a detection module and a compensation module;
wherein a control terminal of the driving module is connected to a first node, and wherein an input terminal of the driving module is connected to a constant voltage terminal of high electrical potential, and wherein an output terminal is connected to a second node, the driving module comprises a first thin film transistor;
wherein a control terminal of the data writing module is connected to a first scan signal line, and wherein an input terminal of the data writing module is connected to a data signal line, and wherein an output terminal of the data writing module is connected to the first node;
wherein a control terminal of the initialization module is connected to a second scan signal line, and wherein an input terminal of the initialization module is connected to a reset signal line, and wherein an output terminal of the initialization module is connected to the second node;
wherein a first terminal of the first capacitor is connected to the first node, and wherein a second terminal of the first capacitor is connected to the second node; and
wherein the detection module comprises an operational amplifier, a first switch, a second switch, and a second capacitor, the detection module is connected to the first node and is configured to control an electrical potential of the first node to obtain a threshold voltage of the driving module, wherein a first input terminal of the operational amplifier is connected to the first node through the first switch, and wherein a second input terminal of the operational amplifier is connected to a reference signal line, wherein the first switch is coupled between the first node and the first input terminal of the operational amplifier; and wherein the second switch and the second capacitor are coupled between the first input terminal of the operational amplifier and an output terminal of the operational amplifier;
wherein the compensation module comprises an analog-to-digital converter, a control device, a digital-to-analog converter, and a third switch, an input terminal of the analog-to-digital converter is connected to the output terminal of the operational amplifier, the analog-to-digital converter is connected to the digital-to-analog converter through the control device, the control device is configured to superimpose a compensation voltage to a data signal from the data signal line, an output terminal of the digital-to-analog converter is connected to an input terminal of the data writing module through the third switch,
wherein the third switch is configured to be turned on when the first switch and the second switch are turned off, such that an electrical potential difference between the first node and the second node is a sum of an electrical potential of the data signal and the threshold voltage, and the first thin film transistor is turned on,
wherein the third switch is configured to be turned on when the first switch and the second switch are turned off, such that a current flowing through the first thin film transistor is not a function of the threshold voltage and is a function of only the data signal.
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