CN-121999705-A - Control circuit and display panel

CN121999705ACN 121999705 ACN121999705 ACN 121999705ACN-121999705-A

Abstract

The application belongs to the technical field of display driving, and particularly relates to a control circuit and a display panel, wherein the control circuit comprises a picture detection module, a first control branch and a second control branch, wherein the picture detection module is configured to detect the abnormal degree of a current display picture and output corresponding detection voltage according to the abnormal degree, the first control branch is configured to conduct a signal path of an ICA compensation module and a rear-stage load when the detection voltage is in a first preset interval, and the second control branch is configured to conduct a signal path of the OP compensation module and the rear-stage load when the detection voltage is in a second preset interval.

Inventors

TAN YAN
CHEN QIANG
Chen kaichuang
Bian Kaiting
CHEN TIAN
YUAN XIAO
XU PEI

Assignees

惠科股份有限公司

Dates

Publication Date: 20260508
Application Date: 20260402

Claims (10)

1. A control circuit applied to a display panel including an ICA compensation module and an OP compensation module, the control circuit comprising: The picture detection module is configured to detect the abnormal degree of the current display picture and output corresponding detection voltage according to the abnormal degree; The first control branch is respectively connected with the output end of the picture detection module, the ICA compensation module and the rear-stage load and is configured to conduct the signal paths of the ICA compensation module and the rear-stage load when the detection voltage is in a first preset interval; The second control branch is respectively connected with the output end of the picture detection module, the OP compensation module and the rear-stage load and is configured to conduct a signal path of the OP compensation module and the rear-stage load when the detection voltage is in a second preset interval; The first preset interval and the second preset interval are at least partially overlapped, so that the first control branch and the second control branch are simultaneously conducted when the detection voltage is in the overlapped interval.
2. The control circuit of claim 1, wherein the first control branch comprises: The first interval judging unit is connected with the output end of the picture detecting module and is configured to judge whether the detected voltage is in a first preset interval or not, output a conducting signal when the detected voltage is in the first preset interval and output a switching-off signal when the detected voltage is not in the first preset interval; The control end of the first transistor is connected with the output end of the first interval judging unit, the first end of the first transistor is connected with the output end of the ICA compensation module, and the second end of the first transistor is connected with the rear-stage load; The first preset interval comprises a first preset threshold value and a second preset threshold value, and the first preset threshold value is smaller than the second preset threshold value.
3. The control circuit according to claim 2, wherein the first section determination unit includes: The first input end of the first comparator is connected with the output end of the picture detection module, and the second input end of the first comparator is connected with the second preset threshold output end; The first input end of the second comparator is connected with the output end of the picture detection module, and the second input end of the second comparator is connected with the first preset threshold output end; the anode of the first diode is connected with the output end of the first comparator; the anode of the second diode is connected with the output end of the second comparator; and the first end of the first resistor is connected with the cathode of the first diode and the cathode of the second diode, and the second end of the first resistor is connected with the control end of the first transistor.
4. The control circuit of claim 1, wherein the first control branch comprises: The first interval judging unit is connected with the output end of the picture detecting module and is configured to judge whether the detected voltage is in a first subinterval or not, output a conducting signal when the detected voltage is in the first subinterval and output a switching-off signal when the detected voltage is not in the first subinterval; The control end of the first transistor is connected with the output end of the first interval judging unit, the first end of the first transistor is connected with the output end of the ICA compensation module, and the second end of the first transistor is connected with the rear-stage load; The second interval judging unit is connected with the output end of the picture detecting module and is configured to judge whether the detected voltage is in a second subinterval or not, output a conducting signal when the detected voltage is in the second subinterval and output a switching-off signal when the detected voltage is not in the second subinterval, wherein the minimum value of the first subinterval is used as a second preset threshold value, and the second preset threshold value is larger than the third preset threshold value; and the control end of the second transistor is connected with the output end of the second interval judging unit, the first end of the second transistor is connected with the output end of the ICA compensation module, and the second end of the second transistor is connected with the rear-stage load.
5. The control circuit according to claim 4, wherein the first section determination unit includes: The first input end of the first comparator is connected with the output end of the picture detection module, and the second input end of the first comparator is connected with the third preset threshold output end; The first input end of the second comparator is connected with the output end of the picture detection module, and the second input end of the second comparator is connected with the first preset threshold output end; The cathode of the first diode is connected with the output end of the first comparator; the cathode of the second diode is connected with the output end of the second comparator; The first end of the first resistor is connected with the anode of the first diode and the anode of the second diode, and the second end of the first resistor is connected with the control end of the first transistor; And the first end of the pull-up resistor is connected with the first end of the first resistor, and the second end of the pull-up resistor is connected with the power supply end.
6. The control circuit according to claim 4, wherein the second section determination unit includes: The first input end of the third comparator is connected with the output end of the picture detection module, and the second input end of the third comparator is connected with the second preset threshold output end; and the first end of the second resistor is connected with the output end of the third comparator, and the second end of the second resistor is connected with the control end of the second transistor.
7. The control circuit of any of claims 1-6, wherein the second control branch comprises: And the control end of the third transistor is connected with the output end of the picture detection module, the first end of the third transistor is connected with the output end of the OP compensation module, and the second end of the third transistor is connected with the rear-stage load.
8. The control circuit according to any one of claims 1 to 6, characterized in that the control circuit further comprises: The blanking detection module is configured to detect whether the blanking period is currently in the blanking period, output a conducting signal when the blanking period is in the blanking period, and output a switching-off signal when the blanking period is not in the blanking period; The control end of the fourth transistor is connected with the output end of the blanking detection module, the first end of the fourth transistor is connected with the output end of the picture detection module, and the second end of the fourth transistor is connected with the input end of the first control branch; and the control end of the fifth transistor is connected with the output end of the blanking detection module, the first end of the fifth transistor is connected with the output end of the picture detection module, and the two ends of the fifth transistor are connected with the input end of the second control branch.
9. A display panel is characterized by comprising N display partitions, wherein one display partition corresponds to one ICA compensation module and one OP compensation module, and the display panel further comprises: The mode detection circuit is configured to detect whether the current display picture is a partition combined picture, output a partition control signal if the current display picture is the partition combined picture, and output a whole-area control signal if the current display picture is a whole-area display picture; The control circuit according to any one of claims 1 to 8, wherein the first input end of each control circuit is connected to the ICA compensation module of the corresponding partition, the second input end of each control circuit is connected to the OP compensation module of the corresponding partition, and the output end of each control circuit is connected to the load of the subsequent stage of the corresponding partition; And the mode switching circuit is respectively connected with the mode detection circuit and the N control circuits and is configured to respond to the partition control signals and transmit the detection voltage output by the picture detection module in the nth control circuit to the first control branch and the second control branch of the nth control circuit, and respond to the whole-area control signals and simultaneously transmit the detection voltage output by the picture detection module in the appointed control circuit to the first control branch and the second control branch of all the control circuits.
10. The display panel according to claim 9, wherein when n=2, and a first control circuit corresponding to a first display section is taken as the specified control circuit, the mode switching circuit includes: a sixth transistor, the control end of which is connected with the output end of the mode detection circuit, and the first end of which is connected with the output end of the picture detection module of the first control circuit; A seventh transistor, a control end of which is connected with the output end of the mode detection circuit, a first end of which is connected with the output end of the picture detection module of the second control circuit, a second end of which is connected with the second end of the sixth transistor, and a second end of which is also connected with the input ends of the first control branch and the second control branch of the second control circuit; Wherein the turn-on voltages of the sixth transistor and the seventh transistor are opposite.

Description

Control circuit and display panel Technical Field The disclosure belongs to the technical field of display driving, and particularly relates to a control circuit and a display panel. Background In the technical field of display, the problem of abnormal pictures such as crosstalk, green screen and the like is a common display defect. In order to solve such problems, an operational amplifier (Operational Amplifier, abbreviated as OP) compensation technique is generally adopted at present, specifically, an operational amplifier is added in an external common electrode voltage (Vcom) generating circuit, and an in-plane feedback voltage is reversely amplified and then is input into the plane again, so that the input voltage and the in-plane Vcom voltage are mutually offset, thereby balancing waveforms of the in-plane common voltage and reducing abnormal phenomena such as crosstalk caused by waveform distortion of the common voltage. However, as the refresh rate of display products increases, the problem of picture anomalies becomes more and more complex. The OP compensation in the related art belongs to a pure hardware scheme, once the OP compensation is deployed, the OP compensation is continuously operated and cannot be flexibly started or stopped according to the change of the picture content, so that an OP compensation circuit still works under a conventional picture without compensation, unnecessary power consumption waste is caused, and meanwhile, an ideal compensation effect is difficult to achieve only by means of OP compensation under a part of special pictures. Therefore, how to reduce the redundancy compensation power consumption and improve the picture compensation effect in the picture compensation process of the display panel is a current problem to be solved. Disclosure of Invention The application provides a control circuit and a display panel, which realize multiple compensation modes of ICA compensation only, OP compensation only and ICA and OP combined compensation according to the abnormal degree of a picture through the cooperative work of a picture detection module, a first control branch and a second control branch, and avoid redundant operation of a compensation function and reduce the power consumption of a system on the premise of improving the picture compensation effect. In a first aspect, the application provides a control circuit applied to a display panel, the display panel comprises an ICA compensation module and an OP compensation module, the control circuit comprises a picture detection module configured to detect the abnormal degree of a current display picture and output corresponding detection voltages according to the abnormal degree, a first control branch circuit connected with an output end of the picture detection module, the ICA compensation module and a rear-stage load respectively and configured to conduct a signal path of the ICA compensation module and the rear-stage load when the detection voltages are in a first preset interval, and a second control branch circuit connected with the output end of the picture detection module, the OP compensation module and the rear-stage load respectively and configured to conduct the signal path of the OP compensation module and the rear-stage load when the detection voltages are in a second preset interval, wherein the first preset interval and the second preset interval are at least partially overlapped, so that the first control branch circuit and the second control branch circuit are simultaneously conducted when the detection voltages are overlapped. The application provides a display panel, which comprises N display partitions, wherein one display partition corresponds to one ICA compensation module and one OP compensation module, the display panel further comprises a mode detection circuit, a mode switching circuit and a mode control circuit, wherein the mode detection circuit is configured to detect whether a current display picture is a partition combined picture, if the current display picture is the partition combined picture, a partition control signal is output, and if the current display picture is a whole display picture, the whole display picture is output, the N control circuits are respectively configured to transmit detection voltages output by the picture detection module in the nth control circuit to a first control branch and a second control branch of the nth control circuit, and the first input end of each control circuit is connected with the ICA compensation module of the corresponding partition, the second input end of each control circuit is connected with the OP compensation module of the corresponding partition, the output end of each control circuit is connected with a rear load of the corresponding partition, and the mode switching circuit is respectively connected with the mode detection circuit and the N control circuits and is configured to simultaneously transmit the detection voltages output b