CN113096595B - Panel module, display driving integrated circuit and method for restarting abnormal voltage of display driving integrated circuit - Google Patents
Panel module, display driving integrated circuit and method for restarting abnormal voltage of display driving integrated circuit Download PDFInfo
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- CN113096595B CN113096595B CN202010018739.0A CN202010018739A CN113096595B CN 113096595 B CN113096595 B CN 113096595B CN 202010018739 A CN202010018739 A CN 202010018739A CN 113096595 B CN113096595 B CN 113096595B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
Abstract
A panel module, a display driving integrated circuit and a method for restarting an abnormal voltage thereof, wherein the display driving integrated circuit receives a display driving power supply voltage of an external power supply circuit, and the method for restarting the abnormal voltage of the display driving integrated circuit comprises the following steps: step A: detecting the display driving power supply voltage; and B, step B: when the voltage of the display driving power supply is out of a rated voltage range, carrying out a restarting procedure of the external power supply circuit, and adding a count value to a default value to be used as the count value; and a step C: and returning to the step A when the count value is smaller than a threshold value.
Description
Technical Field
The present invention relates to a display driver ic, and more particularly, to a panel module, a display driver ic, and a method for restarting an abnormal voltage thereof.
Background
A general driving structure of an organic light emitting diode panel is shown in fig. 1. Fig. 1 is a circuit block diagram of a driving structure of an organic light emitting diode panel in the prior art. Referring to fig. 1, the driving structure includes an external power supply circuit 101, a display driving circuit 102, and a display panel 103. The external power supply circuit 101 is used to supply additional positive voltage Vout + and negative voltage Vout-to the display driving circuit 102. The display driving circuit 102 thereby drives the display panel 103.
When the current oled panel module performs an Electrostatic Discharge (ESD) test, the screen occasionally becomes abnormal, for example, the whole screen has no output and appears as a black screen. The main reason for this is that the display driving Circuit 102 draws a large current, which causes the external power supply Circuit 101 to start a Short Circuit Protection mechanism (Short Circuit Protection), resulting in the voltage (Vout +/Vout-) output abnormality. When the external power supply circuit 101 enters into protection, after the abnormal image (black screen) occurs, the abnormal image will not be recovered continuously, and the abnormal image is not acceptable in the product.
Therefore, there is a need for a new and improved panel module, display driver ic and method for restarting abnormal voltages thereof that can avoid the above-mentioned problems.
Disclosure of Invention
An objective of the present invention is to provide a display driver ic and a method for restarting the abnormal voltage thereof, in which a power supply circuit is restarted by an additional control mechanism.
In view of the above, the present invention provides a method for restarting an abnormal voltage of a display driver ic, wherein the display driver ic receives a display driver power voltage of an external power supply circuit, and the method for restarting the abnormal voltage of the display driver ic comprises the following steps: step A: detecting the display driving power supply voltage; and B: when the voltage of the display driving power supply is out of a rated voltage range, the display driving integrated circuit outputs a restart signal to carry out a restart procedure of the external power supply circuit, and a count value is added with a default value to be used as the count value; and step C: and returning to the step A when the count value is smaller than a threshold value.
According to a preferred embodiment of the present invention, the method for restarting an abnormal voltage of a display driver ic further comprises, when the display driver power voltage is outside a rated voltage range: judging whether the power supply voltage of the driving display driving integrated circuit is lower than a threshold voltage or not; and if yes, performing a shutdown procedure. In a preferred embodiment, the method further comprises: when the counting value is larger than a threshold value, a shutdown procedure is carried out.
The present invention further provides a display driving integrated circuit, which receives a display driving power voltage of an external power supply circuit, and includes a data driving circuit, a voltage determining/resetting circuit, and a counting circuit. The data driving circuit is coupled to a data line of a display panel for driving the display panel. The voltage judging/resetting circuit is coupled with the external power supply circuit, receives the display driving power supply voltage, and detects whether the display driving power supply voltage is lower than a rated voltage, wherein when the display driving power supply voltage is out of a rated voltage range, a restarting signal is output to carry out a restarting program of the external power supply circuit, and a counting signal is output. The counting circuit is coupled with the voltage judging/resetting circuit and receives the counting signal, wherein, every time the counting signal is received, a counting value is added with a default value to be used as the counting value.
The present invention further provides a panel module, which includes a display panel, a display driver ic, and a power supply circuit. The display driving integrated circuit receives a display driving power supply voltage of an external power supply circuit, and comprises a data driving circuit, a voltage judging/resetting circuit and a counting circuit. The data driving circuit is coupled to a data line of a display panel for driving the display panel. The voltage judging/resetting circuit is coupled with the external power supply circuit, receives the display driving power supply voltage, and detects whether the display driving power supply voltage is lower than a rated voltage, wherein when the display driving power supply voltage is out of a rated voltage range, a restarting signal is output to carry out a restarting program of the external power supply circuit, and a counting signal is output. The counting circuit is coupled with the voltage judging/resetting circuit and receives the counting signal, wherein, every time the counting signal is received, a counting value is added with a default value to be used as the counting value.
The spirit of the invention lies in that an additional control mechanism is utilized, when the power supply is abnormal, the power supply is tried to restart, the frequency is controlled by the counter, if the power supply is restarted, the power supply is recovered to be normal, the external power supply module is not damaged, and the power supply module is only used for false triggering protection during static electricity test, so the power supply can be continuously used. If the external power supply module is restarted for a plurality of times, the power supply can not be recovered to be normal, and the condition of the external power supply module is indicated. Therefore, the product is prevented from being bad due to circuit misjudgment, and meanwhile, the product is protected from accidents.
In order to make the aforementioned and other objects, features and advantages of the invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1 is a circuit block diagram of a driving structure of an organic light emitting diode panel in the prior art.
Fig. 2 is a schematic diagram of a panel module according to a preferred embodiment of the invention.
FIG. 3 is a diagram of a display driver IC according to a preferred embodiment of the invention.
FIG. 4 is a diagram of a display driver IC according to a preferred embodiment of the present invention.
FIG. 5 is a flowchart illustrating a method for restarting an abnormal voltage of a driver IC according to a preferred embodiment of the invention.
FIG. 6 is a flowchart illustrating a method for restarting an abnormal voltage of a driver IC according to a preferred embodiment of the invention.
Description of the symbols:
101: external power supply circuit
101: display driving circuit
103: display panel
20: display panel
21: power supply circuit
22: display driving integrated circuit
Vout +/Vout-: display driving power supply voltage
CTRL: restart signal
301: data driving circuit
302: voltage judging/resetting circuit
303: counting circuit
S501 to S507: the steps of a preferred embodiment of the present invention
Detailed Description
Fig. 2 is a schematic diagram of a panel module according to a preferred embodiment of the invention. Referring to fig. 2, the panel module includes a display panel 20, a power supply circuit 21 and a display driver ic 22. In this embodiment, the OLED panel module is also taken as an example, so the display driver IC 22 needs an additional power supply circuit 21 to supply the display driving power voltage (Vout +/Vout-). Furthermore, compared to the driving structure of the organic light emitting diode panel in the prior art, in this embodiment, a reset signal CTRL is additionally added to the display driving ic 22 for controlling the power supply circuit 21.
FIG. 3 is a diagram of a display driver IC according to a preferred embodiment of the invention. Referring to fig. 3, the display driver ic 22 includes a data driver circuit 301, a voltage determining/resetting circuit 302, and a counter circuit 303. Similarly, the display driver IC 22 receives the display driver power supply voltage (Vout +/Vout-) from the external power supply circuit 21. Furthermore, since the power supply circuit externally connected to the oled panel is usually used to simply provide the display driving power voltage (Vout +/Vout-), and there is no restart mechanism, those skilled in the art can choose to use a power driving ic capable of being restarted, receive the restart signal CTRL, and control the external power supply circuit 21 to restart. One skilled in the art may also choose to couple a switch between the power input of the power driver ic and the battery voltage Vbattery and control the switch with the restart signal CTRL to implement a power restart.
The data driving circuit 301 is coupled to data lines Sout0 to Sout1080 of the display panel for driving the display panel 20. The voltage determining/resetting circuit 302 is coupled to the external power supply circuit, receives the display driving power voltage (Vout +/Vout-), and detects whether the magnitude of the display driving power voltage is outside the rated voltage range. For example, whether the positive driving power voltage Vout + is lower than (3V), and whether the negative driving power voltage Vout-is greater than (-1). When the display driving power voltage (Vout +/Vout-) is outside the rated voltage range, the voltage determining/resetting circuit 302 outputs a reset signal CTRL to perform a reset procedure of the power supply circuit 21, and outputs a count signal Cnt to the internal counting circuit 303. The counting circuit 303 is coupled to the voltage determining/resetting circuit 302 and receives the counting signal Cnt, wherein a predetermined value (generally 1) is added to a counting value as the counting value every time the counting signal Cnt is received.
Generally, when an electrostatic discharge (ESD) test is performed, the voltage output of the external power supply circuit 21 is not normal, and further the power supply circuit 21 enters short-circuit protection, and the power supply circuit 21 is in a normal state, and the circuit is not damaged. At this time, the voltage determination/reset circuit 302 outputs the reset signal CTRL to reset the power supply circuit 21, so that the power supply circuit 21 can operate normally, and the driving power voltage (Vout +/Vout-) is restored to normal.
If the external power supply circuit 21 is supposed to be damaged, the power supply circuit 21 cannot be normally woken up by the restart signal CTRL. The internal counting circuit 303 continuously receives the counting signal Cnt, accumulates the counting value, and when the counting value is greater than a threshold value, it indicates that the number of reboots reaches a certain number, and at this time, it can be determined that the power supply circuit 21 cannot normally operate, and then the reboots is stopped, and the shutdown procedure is performed.
Fig. 4 is a waveform diagram illustrating the operation of the panel module according to a preferred embodiment of the present invention. Referring to fig. 4, at startup, the sleep start signal Slp _ out goes from low to high, indicating startup or the machine going from the sleep mode to the normal mode. The restart signal CTRL starts to start the external power supply circuit 21. When the display driving power voltage Vout is abnormal, the display driving power voltage detection signal Vout ld Detect is converted from a low voltage to a high voltage, and the restart signal CTRL is converted from a high voltage to a low voltage, and the discharge is performed first, and then the restart procedure is performed.
FIG. 5 is a flowchart illustrating a method for restarting an abnormal voltage of a driver IC according to a preferred embodiment of the present invention. Referring to fig. 3, the method for restarting the abnormal voltage of the display driver ic includes the following steps:
step S501: and starting. The normal display mode is started.
Step S502: whether the display driving power supply voltage (Vout +/Vout-) is out of a rated voltage range is judged. If the determination in step S502 is no, step S502 is repeated to continue the determination. If yes in step S502, the process proceeds to step S503.
Step S503: it is determined whether or not the power supply Voltage (VCI) of the display drive integrated circuit 22 is abnormal. The display driving power supply voltage (Vout +/Vout-) abnormality may be caused by an abnormality of the entire power supply voltage in addition to the entry protection. Therefore, in the preferred embodiment, a determination step is added to check whether the other power domain is abnormal, so as to ensure that the determination result of step S502 is not abnormal display driving power voltage (Vout +/Vout-) caused by abnormal overall power supply. If the judgment in the step S503 is negative, the step S504 is entered; if the determination in step S503 is yes, the process proceeds to step S506.
Step S504: and judging whether the count value is larger than a threshold value. If it is determined not to be the case, the process proceeds to step S505, and if it is determined to be the case, the process proceeds to step S506.
Step S505: the external power supply circuit 21 is restarted and a default value is added to the count value as the above count value. And returns to step S502 to continue the judgment.
Step S506: and entering a shutdown program. In step S503, since the power abnormality also occurs in the other power domain, the shutdown procedure is performed within a possible range. In step S504, if the count value is greater than the threshold value, it indicates that the method of the embodiment of the present invention has been restarted many times enough, and the external power supply circuit 21 still cannot be started enough to determine that the external power supply circuit 21 may be abnormal, so that the shutdown procedure is performed.
Step S507: and (6) ending.
In the step flow chart of fig. 5 in the above embodiment, step S503 is, for example, a step that can be designed and selected, and therefore, it should be understood by those skilled in the art that the step flow chart of fig. 5 can also be simplified to the step flow chart of fig. 6. FIG. 6 is a flowchart illustrating a method for restarting an abnormal voltage of a driver IC according to a preferred embodiment of the invention. The difference between fig. 6 and fig. 5 lies in that step S503 is deleted, that is, in this embodiment, the determination result of step S502 is not confirmed, and the remaining steps are similar to those described above, and therefore are not described in detail again.
In summary, the spirit of the present invention is to utilize an additional control mechanism, when the power supply is abnormal, the power supply is restarted and controlled by the counter for the number of times, if the power supply is restarted, the power supply is recovered to normal, which means that the external power supply module is not damaged, and only is a false trigger protection during the static test, so that the power supply can be used continuously. If the external power supply module is restarted for a plurality of times, the power supply can not be recovered to be normal, and the external power supply module is in a state of going out. Therefore, the product is prevented from being bad due to circuit misjudgment, and meanwhile, the product is protected from accidents.
The detailed description of the preferred embodiments is provided only for the convenience of illustrating the technical contents of the present invention, and the present invention is not limited to the above-described embodiments in a narrow sense, and various modifications made without departing from the spirit of the present invention and the scope of the following claims are included in the scope of the present invention. Therefore, the protection scope of the present invention should be defined by the appended claims.
Claims (10)
1. A method for restarting an abnormal voltage of a display driver integrated circuit, wherein the display driver integrated circuit receives a display driver power supply voltage of an external power supply circuit, the method comprising:
step A: detecting the display driving power supply voltage;
and B: when the voltage of the display driving power supply is out of a rated voltage range, carrying out a restart program of the external power supply circuit, and adding a count value to a default value to be used as the count value; and
and C: when the count value is smaller than a threshold value, returning to step a, wherein performing the restart procedure of the external power supply circuit includes:
and controlling a switch between the power input end of the power driving integrated circuit of the external power supply circuit and the input battery voltage by the restart signal so as to realize power restart.
2. The method of claim 1, further comprising, when the display driving power voltage is outside the rated voltage range:
the display driving integrated circuit outputs a restart signal to carry out a restart procedure of the external power supply circuit.
3. The method of claim 1, further comprising, when the display driving power voltage is outside the rated voltage range:
judging whether the power supply voltage of the driving display driving integrated circuit is lower than a threshold voltage or not; and
if yes, a shutdown procedure is performed.
4. The restart method of abnormal voltage of display driving integrated circuit according to claim 1, further comprising:
when the counting value is larger than a threshold value, a shutdown procedure is carried out.
5. A display driver IC, wherein the display driver IC receives a display driver power supply voltage from an external power supply circuit, the display driver IC comprising:
a data driving circuit coupled to data lines of a display panel for driving the display panel;
a voltage judging/resetting circuit coupled with the external power supply circuit, receiving the display driving power supply voltage, and detecting whether the display driving power supply voltage is lower than a rated voltage, wherein when the display driving power supply voltage is out of a rated voltage range, a restarting signal is output to carry out a restarting procedure of the external power supply circuit, and a counting signal is output; and
a counting circuit coupled to the voltage judging/resetting circuit for receiving the counting signal, wherein each time the counting signal is received, a default value is added to a counting value as the counting value, wherein the restarting program of the external power supply circuit comprises:
and controlling a switch between the power input end of the power driving integrated circuit of the external power supply circuit and the input battery voltage by the restart signal so as to realize power restart.
6. The display driver IC of claim 5, wherein when the count value is greater than a threshold value, the counter circuit controls the display driver IC to perform a shutdown procedure.
7. The display driving integrated circuit of claim 5, wherein when the voltage determining/resetting circuit determines that the display driving power voltage is within the range of the rated voltage, the counting circuit is controlled to reset the counting value to an initial value.
8. A panel module, comprising:
a display panel;
a power supply circuit for providing a display driving power voltage; and
a display driver ic, wherein the display driver ic receives a display driver power supply voltage from an external power supply circuit, the display driver ic comprising:
a data driving circuit coupled to a data line of a display panel for driving the display panel;
a voltage judging/resetting circuit coupled to the external power supply circuit for receiving the display driving power voltage and detecting whether the display driving power voltage is lower than a rated voltage, wherein when the display driving power voltage is out of a rated voltage range, a restarting signal is output to perform a restarting procedure of the external power supply circuit and a counting signal is output; and
a counting circuit coupled to the voltage judging/resetting circuit for receiving the counting signal, wherein each time the counting signal is received, a default value is added to a counting value as the counting value, wherein the restarting program of the external power supply circuit comprises:
and controlling a switch between a power input end of a power driving integrated circuit of the external power supply circuit and the input battery voltage by using the restart signal so as to realize power restart.
9. The panel module of claim 8, wherein the counting circuit controls the display driver IC to perform a shutdown procedure when the count value is greater than a threshold value.
10. The panel module of claim 9, wherein when the voltage determining/resetting circuit determines that the display driving power voltage is within the range of the rated voltage, the counting circuit is controlled to reset the count value to an initial value.
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| CN202010018739.0A CN113096595B (en) | 2020-01-08 | 2020-01-08 | Panel module, display driving integrated circuit and method for restarting abnormal voltage of display driving integrated circuit |
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| CN202010018739.0A CN113096595B (en) | 2020-01-08 | 2020-01-08 | Panel module, display driving integrated circuit and method for restarting abnormal voltage of display driving integrated circuit |
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| CN113096595B true CN113096595B (en) | 2023-04-11 |
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| CN102103835A (en) * | 2009-12-18 | 2011-06-22 | 华映视讯（吴江）有限公司 | Liquid crystal display and method for detecting and eliminating residual shadows |
| CN102654967B (en) * | 2011-11-21 | 2015-01-07 | 京东方科技集团股份有限公司 | Automatic power supply abnormality detection apparatus, drive circuit and display device |
| CN104021758A (en) * | 2014-05-30 | 2014-09-03 | 京东方科技集团股份有限公司 | Driving circuit and organic electroluminescence display device |
| TWI560673B (en) * | 2015-12-02 | 2016-12-01 | Au Optronics Corp | Power supply circuit and driving method of display panel |
| CN109256075B (en) * | 2017-07-13 | 2020-08-25 | 昆山国显光电有限公司 | Display screen power supply control method and device, storage medium and electronic equipment |
| CN109389925A (en) * | 2017-08-08 | 2019-02-26 | 宏碁股份有限公司 | Display and its dynamic driving voltage compensating method |
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