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US 2026/0204201 A1Published application
Display driving circuit and display driving method
AssigneeHimax Technologies Limited
InventorsTsung-Lin Chuang, Chuan-Chien Hsu
Life of this patent
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Abstract
A display driving circuit and a display driving method are provided. The display driving circuit includes a controller, a common voltage supply circuit, and a border voltage supply circuit. The controller generates a plurality of border voltage control signals and a plurality of common voltage control signals. The common voltage supply circuit outputs a common voltage to the display panel according to the plurality of common voltage control signals. The border voltage supply circuit outputs a border voltage to the display panel according to the plurality of border voltage control signals. When a voltage polarity of the common voltage is reversed, the common voltage supply circuit performs charge sharing by a common ground voltage.
Claims20
A display driving circuit, comprising:
- a controller, configured to generate a plurality of border voltage control signals and a plurality of common voltage control signals;
- a common voltage supply circuit, coupled to the controller and a display panel, and configured to output a common voltage to the display panel according to the plurality of common voltage control signals;
- and
- a border voltage supply circuit, coupled to the controller and the display panel, and configured to output a border voltage to the display panel according to the plurality of border voltage control signals,
- wherein when the common voltage supply circuit determines that a voltage polarity of the common voltage is reversed according to the plurality of common voltage control signals, the common voltage supply circuit performs charge sharing by a common ground voltage during a common voltage polarity reversal process,
- wherein the plurality of common voltage control signals comprises a high common voltage level control signal and a low common voltage level control signal, and the common voltage supply circuit comprises:
- a first operational amplifier configured to output the common voltage based on a first enable signal, and
- a logic circuit configured to generate the first enable signal for the operational amplifier based on the high common voltage level control signal and the low common voltage level control signal,
- wherein when the border voltage supply circuit determines that a voltage polarity of the border voltage is reversed according to the plurality of border voltage control signals, the border voltage supply circuit performs charge sharing by a border ground voltage during a border voltage polarity reversal process,
- wherein the common voltage supply circuit further comprises:
- a first switch circuit, wherein a first terminal of the first switch circuit receives a positive voltage, a control terminal of the first switch circuit receives the high common voltage level control signal;
- a second switch circuit, wherein a first terminal of the second switch circuit receives a negative voltage, a control terminal of the second switch circuit receives the low common voltage level control signal;
- a first resistor, wherein a first terminal of the first resistor is coupled to a plurality of second terminals of the first switch circuit and the second switch circuit, and a second terminal of the first resistor is coupled to a first node;
- and
- a second resistor, wherein a first terminal of the second resistor receives a first reference voltage, and a second terminal of the second resistor is coupled to the first node;
- wherein a first input terminal of the first operational amplifier is coupled to the first node, a control terminal of the first operational amplifier receives the first enable signal, and an output terminal of the first operational amplifier outputs the common voltage.
13 more elements
(canceled)
(canceled)
A display driving method, comprising:
- generating a plurality of border voltage control signals and a plurality of common voltage control signals by a controller;
- outputting a common voltage to the display panel according to the plurality of common voltage control signals by a common voltage supply circuit;
- outputting a border voltage to the display panel according to the plurality of border voltage control signals by a border voltage supply circuit;
- and
- when a voltage polarity of the common voltage is reversed, performing charge sharing by a common ground voltage during a common voltage polarity reversal process, wherein
- the plurality of common voltage control signals comprises a high common voltage level control signal and a low common voltage level control signal;
- the common voltage is output by a first operational amplifier based on a first enable signal, and
- the first enable signal for the operational amplifier is generated by a logic circuit based on the high common voltage level control signal and the low common voltage level control signal,
- wherein the display driving method further comprising:
- when a voltage polarity of the border voltage is reversed, performing charge sharing by a border ground voltage during a border voltage polarity reversal process,
- wherein the common voltage supply circuit comprises:
- a first switch circuit, wherein a first terminal of the first switch circuit receives a positive voltage, a control terminal of the first switch circuit receives the high common voltage level control signal;
- a second switch circuit, wherein a first terminal of the second switch circuit receives a negative voltage, a control terminal of the second switch circuit receives the low common voltage level control signal;
- a first resistor, wherein a first terminal of the first resistor is coupled to a plurality of second terminals of the first switch circuit and the second switch circuit, and a second terminal of the first resistor is coupled to a first node;
- and
- a second resistor, wherein a first terminal of the second resistor receives a first reference voltage, and a second terminal of the second resistor is coupled to the first node;
- wherein a first input terminal of the first operational amplifier is coupled to the first node, a control terminal of the first operational amplifier receives the first enable signal, and an output terminal of the first operational amplifier outputs the common voltage.
14 more elements
(canceled)
Dependencies are inferred from the claim text.