TWI717965B - Display module, display driver integrated circuit and restarting method for display driver integrated circuit when abnormal voltage occurs - Google Patents

Abstract

A display module, a display driver integrated circuit and a restarting method for a display driver integrated circuit when abnormal voltage occurs are provided in the present invention. The display and touch sensing IC receives a display driving power voltage from an external power supply. The method includes at least the following steps. In step A, the display driving power voltage is detected. In step B, a restart procedure of the external power supply is performed when the display driving power voltage is lower than a threshold voltage and a counting value adds a preset value to serve as the counting value. And, in step C, when the counting value is smaller than a threshold value, the step A is returned.

Description

Panel module, display drive integrated circuit and method for restarting abnormal voltage thereof

The present invention relates to a display driving integrated circuit technology. More specifically, the present invention relates to a panel module, a display driving integrated circuit and a method for restarting abnormal voltages thereof.

The driving architecture of a general organic light emitting diode panel is shown in Figure 1. FIG. 1 is a circuit block diagram of the driving structure of the organic light emitting diode panel of the prior art. Please refer to FIG. 1. This 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 the additional positive voltage Vout+ and the negative voltage Vout- of the display driving circuit 102. The display driving circuit 102 thereby drives the display panel 103.

When the current organic light-emitting diode panel module is tested for Electrostatic Discharge (ESD), the screen occasionally has an abnormality, for example, the entire screen has no output and appears black. Screen. The main reason is that the display driving circuit 102 draws a large current, which causes the external power supply circuit 101 to activate the short circuit protection mechanism (Short Circuit Protection), which causes the output of the aforementioned voltage (Vout+/Vout-) to be abnormal. Because when the external power supply circuit 101 enters the protection, after the screen is abnormal (black screen), the abnormal screen will continue to be unrecoverable, and this kind of abnormality is unacceptable on the product.

Therefore, there is a need for a newly improved panel module, a display drive integrated circuit, and a restart method of abnormal voltage that can avoid the above-mentioned problems.

An object of the present invention is to provide a display driving integrated circuit and a method for restarting the abnormal voltage thereof, which restarts the power supply circuit through an additional control mechanism.

In view of this, the present invention provides a method for restarting the abnormal voltage of a display driving integrated circuit, wherein the display driving integrated circuit receives a display driving power supply voltage of an external power supply circuit, and the display driving integrated circuit displays the abnormal voltage of the driving integrated circuit The restart method includes the following steps: Step A: Detect the display drive power supply voltage; Step B: When the display drive power supply voltage is outside a rated voltage range, the display drive integrated circuit outputs a restart signal to perform the external Restart the power supply circuit and add a count value to a preset value as the count value; and step C: when the count value is less than a threshold value, go back to step A.

The display driver according to the preferred embodiment of the present invention The method for restarting the abnormal voltage of the dynamic integrated circuit, wherein, when the display driving power supply voltage is outside a rated voltage range, it also includes: judging whether the power supply voltage of the driving display driving integrated circuit is lower than a threshold voltage; and judging as If yes, perform a shutdown procedure. In a preferred embodiment, the above method further includes: when the count value is greater than a threshold value, performing a shutdown procedure.

The present invention also provides a display drive integrated circuit, the display drive integrated circuit receives a display drive power voltage of one of an external power supply circuit, the display drive integrated circuit includes a data drive circuit, a voltage judgment/reset 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 judgment/reset circuit is coupled to the external power supply circuit, receives the display drive power voltage, and detects whether the display drive power voltage is lower than a rated voltage. When the display drive power voltage is outside a rated voltage range, it outputs a The restart signal is used to perform the restart procedure of the external power supply circuit and output a counting signal. The counting circuit is coupled to the voltage judging/resetting circuit and receives the counting signal. Each time the counting signal is received, a count value is added to a preset value as the count value.

The present invention also provides a panel module, which includes a display panel, a display drive integrated circuit, and a power supply circuit. The display driving integrated circuit receives a display driving power voltage of an external power supply circuit. The display driving integrated circuit includes a data driving circuit, a voltage judgment/reset 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 judgment/reset circuit is coupled to the external power supply circuit and receives the display driving power Power source voltage, and detect whether the display drive power voltage is lower than a rated voltage, where, when the display drive power voltage is outside a rated voltage range, a restart signal is output to perform the restart procedure of the external power supply circuit and output One count signal. The counting circuit is coupled to the voltage judgment/reset circuit and receives the counting signal. Each time the counting signal is received, a count value is added to a preset value as the count value.

The spirit of the present invention is to use an additional control mechanism to try to restart when the power supply is abnormal, and control the number of times by a counter. If the power supply returns to normal after restarting, it means that the external power supply module is not damaged, only Mis-trigger protection during electrostatic testing, so it can be used continuously. If the power supply cannot be restored to normal after restarting several times, it means that the external power supply module is out of order. In this way, in addition to avoiding circuit misjudgment leading to product failure, it also protects the product from accidents.

In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments and accompanying drawings are described in detail as follows.

101‧‧‧External power supply circuit

101‧‧‧Display drive circuit

103‧‧‧Display Panel

20‧‧‧Display Panel

21‧‧‧Power supply circuit

22‧‧‧Display driver integrated circuit

Vout+/Vout-‧‧‧Display driving power voltage

CTRL‧‧‧Restart signal

301‧‧‧Data drive circuit

302‧‧‧Voltage judgment/reset circuit

303‧‧‧Counting circuit

S501~S507‧‧‧The steps of a preferred embodiment of the present invention

FIG. 1 is a circuit block diagram of the driving structure of the organic light emitting diode panel of the prior art.

FIG. 2 is a schematic diagram of a panel module according to a preferred embodiment of the present invention.

FIG. 3 is a schematic diagram of a display driving integrated circuit according to a preferred embodiment of the present invention.

FIG. 4 is a schematic diagram of a display driving integrated circuit according to a preferred embodiment of the present invention.

FIG. 5 is a flowchart of a method for restarting the abnormal voltage of a display driving integrated circuit according to a preferred embodiment of the present invention.

FIG. 6 is a flowchart of a method for restarting the abnormal voltage of a display driving integrated circuit according to a preferred embodiment of the present invention.

FIG. 2 is a schematic diagram of a panel module according to a preferred embodiment of the present invention. Please refer to FIG. 2, this panel module includes a display panel 20, a power supply circuit 21 and a display driving integrated circuit 22. In this embodiment, the organic light emitting diode panel module is also taken as an example, so the display driving integrated circuit 22 needs an additional power supply circuit 21 to supply the display driving power voltage (Vout+/Vout-). Furthermore, compared with the driving structure of the organic light emitting diode panel in the prior art, in this embodiment, the display driving integrated circuit 22 additionally adds a restart signal CTRL to control the power supply circuit 21.

FIG. 3 is a schematic diagram of a display driving integrated circuit according to a preferred embodiment of the present invention. Please refer to FIG. 3, the display driving integrated circuit 22 includes a data driving circuit 301, a voltage judgment/reset circuit 302, and a counting circuit 303. Similarly, the display drive integrated circuit 22 receives the display drive power voltage (Vout+/Vout-) of the external power supply circuit 21. Moreover, since the power supply circuit external to the general organic light emitting diode panel is often used to simply provide display driving power Voltage (Vout+/Vout-) does not have a restart mechanism. Those skilled in the art can choose to use a restartable power supply to drive the integrated circuit, receive the restart signal CTRL, and control the external power supply circuit 21 to restart. Those skilled in the art can also choose to couple a switch between the power input terminal of the power drive integrated circuit and the battery voltage Vbattery, and control the switch with the restart signal CTRL to restart the power supply.

The data driving circuit 301 is coupled to the data lines Sout0 to Sout1080 of the display panel for driving the display panel 20. The voltage judgment/reset circuit 302 is coupled to the external power supply circuit, receives the display drive power voltage (Vout+/Vout-), and detects whether the display drive power voltage is outside the rated voltage range. For example, whether the positive driving power supply voltage Vout+ is lower than (3V), and whether the negative driving power supply voltage Vout- is greater than (-1). When the display driving power voltage (Vout+/Vout-) is outside the rated voltage range, at this time, the voltage judgment/reset circuit 302 outputs the restart signal CTRL to perform the restart procedure of the power supply circuit 21, and outputs a count signal Cnt to the internal的Counting circuit 303. The counting circuit 303 is coupled to the voltage judgment/reset circuit 302 and receives the counting signal Cnt. Each time the counting signal Cnt is received, a count value is added to a preset value (generally 1) as the count value.

Generally speaking, during an electrostatic discharge (ESD) test, the voltage output of the external power supply circuit 21 is often abnormal, which further causes the power supply circuit 21 to enter short-circuit protection, and the power supply circuit 21 is actually in a normal state. Not damaged. At this time, use electricity The voltage judgment/reset circuit 302 outputs the restart signal CTRL to restart the power supply circuit 21, so that the power supply circuit 21 can operate normally, and the display driving power voltage (Vout+/Vout-) returns to normal.

If it is assumed that the external power supply circuit 21 is indeed damaged, the power supply circuit 21 cannot be woken up normally after the restart signal CTRL at this time. The internal counting circuit 303 will continue to receive the counting signal Cnt and accumulate the count value. When the count value is greater than a threshold value, it means that the number of restarts reaches a certain number of times. At this time, it can be determined that the power supply circuit 21 cannot operate normally at this time, and it stops execution. Restart and perform shutdown procedures.

FIG. 4 is an operation waveform diagram of the panel module according to a preferred embodiment of the present invention. Please refer to Figure 4, during startup, the sleep start signal Slp_out turns from low to high, which means that the machine is turned on or the machine switches from sleep mode to normal mode. The restart signal CTRL starts to activate the external power supply circuit 21. When the display driving power supply voltage Vout is abnormal, the display driving power supply voltage detection signal Vout Lvd Detect changes from low voltage to high voltage. At this time, the restart signal CTRL changes from high voltage to low voltage, discharge is performed first, and then the restart process is performed.

FIG. 5 is a flowchart of a method for restarting the abnormal voltage of a display driving integrated circuit according to a preferred embodiment of the present invention. Please refer to Figure 3. This method for restarting the abnormal voltage of the driving integrated circuit includes the following steps:

Step S501: Start. The normal display mode is started.

Step S502: Determine whether the display driving power voltage (Vout+/Vout-) is outside a rated voltage range. If step S502 is judged as negative, step S502 is repeated to continue the judgment. If step S502 is determined to be YES, then step S503 is entered.

Step S503: Determine whether the power supply voltage (VCI) of the display driving integrated circuit 22 is abnormal. Because the display drive power supply voltage (Vout+/Vout-) is abnormal, in addition to the access protection, it may also be caused by the overall power supply voltage abnormality. Therefore, in this preferred embodiment, a judging step is added to check whether another power domain is abnormal to ensure that the judgment result of step S502 is not the display driving power voltage caused by the overall power supply abnormality. (Vout+/Vout-) is abnormal. If step S503 is judged to be no, then go to step S504; if step S503 is judged to be yes, go to step S506.

Step S504: Determine whether the count value is greater than a threshold value. If the judgment is no, then go to step S505, and if the judgment is yes, then go to step S506.

Step S505: Perform a restart procedure of the external power supply circuit 21, and add a preset value to the count value as the aforementioned count value. And return to step S502 to continue the judgment.

Step S506: Enter the shutdown procedure. Taking step S503 as an example, since another power domain also has a power abnormality, the shutdown procedure is performed within the possible range. Furthermore, taking step S504 as an example, if the count value is greater than the threshold value, it means that the method of the embodiment of the present invention has restarted enough times and the external power supply circuit 21 cannot be started, which is sufficient to determine that the external power supply circuit 21 may be abnormal. Therefore, the shutdown procedure is performed.

Step S507: End.

In the step flow chart of Figure 5 in the above embodiment, step S503 is, for example, a step that can be designed and selected. Therefore, those with ordinary knowledge in the art should know that the step flow chart of Figure 5 can also be simplified to the sixth step. Diagram of the step flow chart. FIG. 6 is a flowchart of a method for restarting the abnormal voltage of a display driving integrated circuit according to a preferred embodiment of the present invention. Wherein, the difference between FIG. 6 and FIG. 5 is that step S503 is deleted. That is, in this embodiment, the judgment result of step S502 is not confirmed, and the remaining steps are similar to the above, so they will not be described in detail.

In summary, the spirit of the present invention is to use an additional control mechanism to try to restart when the power supply is abnormal, and the counter is used to control the number of times. If the power supply returns to normal after restarting, it means that the external power supply module is not connected. It is not damaged, it is only a false trigger protection during electrostatic testing, so it can be used continuously. If the power supply cannot be restored to normal after restarting several times, it means that the external power supply module is out of order. In this way, in addition to avoiding circuit misjudgment leading to product failure, it also protects the product from accidents.

The specific embodiments proposed in the detailed description of the preferred embodiments are only used to facilitate the description of the technical content of the present invention, instead of restricting the present invention to the above-mentioned embodiments in a narrow sense, and do not exceed the spirit of the present invention and apply for patents below. The conditions of the scope, various changes and implementations made, all belong to the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to those defined by the attached patent application scope.

S501~S507‧‧‧The steps of a preferred embodiment of the present invention

Claims (10)

A method for restarting the abnormal voltage of a display driving integrated circuit, wherein the display driving integrated circuit receives a display driving power voltage of one of an external power supply circuit, and the restarting method of the abnormal voltage of the display driving integrated circuit includes: Step A: Detect the display drive power supply voltage; Step B: When the display driving power supply voltage is outside a rated voltage range, perform the restart procedure of the external power supply circuit, and add a count value to a preset value as the count value; and Step C: When the count value is less than a threshold value, go back to Step A. For example, the method for restarting the abnormal voltage of the display drive integrated circuit described in item 1 of the scope of patent application, wherein, when the display drive power supply voltage is outside the rated voltage range, it also includes: The display drive integrated circuit outputs a restart signal to perform the restart procedure of the external power supply circuit. For example, the method for restarting the abnormal voltage of the display drive integrated circuit described in item 1 of the scope of patent application, wherein, when the display drive power supply voltage is outside the rated voltage range, it also includes: Determining whether the power supply voltage of the driving display driving integrated circuit is lower than a threshold voltage; and When the judgment is yes, a shutdown procedure is performed. For example, the method for restarting the abnormal voltage of the display drive integrated circuit described in item 1 of the scope of patent application also includes: When the count value is greater than a threshold value, a shutdown procedure is performed. A display driving integrated circuit, wherein the display driving integrated circuit receives a display driving power voltage of one of an external power supply circuit, and the display driving integrated circuit includes: A data driving circuit coupled to a data line of a display panel for driving the display panel; A voltage judgment/reset circuit, coupled to the external power supply circuit, receives the display drive power supply voltage, and detects whether the display drive power supply voltage is lower than a rated voltage, wherein, when the display drive power supply voltage is at a rated voltage Out of the voltage range, output a restart signal to perform the restart procedure of the external power supply circuit, and output a counting signal; and A counting circuit is coupled to the voltage judging/resetting circuit and receives the counting signal. Each time the counting signal is received, a counting value is added to a predetermined value as the counting value. For example, the display driving integrated circuit described in item 5 of the scope of patent application, wherein, when the count value is greater than a threshold value, the counting circuit controls the display driving integrated circuit to perform a shutdown procedure. Such as the display drive integrated circuit described in item 5 of the scope of patent application, wherein, when the voltage judgment/reset circuit judges the display drive power If the voltage is within the range of the rated voltage, the counting circuit is controlled to reset the count value to an initial value. A panel module, including: A display panel; A power supply circuit that provides a display drive power supply voltage; and A display driving integrated circuit, wherein the display driving integrated circuit receives a display driving power voltage of one of an external power supply circuit, and the display driving integrated circuit includes: A data driving circuit coupled to a data line of a display panel for driving the display panel; A voltage judgment/reset circuit, coupled to the external power supply circuit, receives the display drive power supply voltage, and detects whether the display drive power supply voltage is lower than a rated voltage, wherein, when the display drive power supply voltage is at a rated voltage Out of the voltage range, output a restart signal to perform the restart procedure of the external power supply circuit, and output a counting signal; and A counting circuit is coupled to the voltage judging/resetting circuit and receives the counting signal. Each time the counting signal is received, a counting value is added to a predetermined value as the counting value. For example, in the panel module described in item 8 of the scope of patent application, when the count value is greater than a threshold value, the count circuit controls the display drive integrated circuit to perform a shutdown procedure. For example, the panel module described in item 9 of the scope of patent application, wherein, when the voltage determination/reset circuit determines that the display driving power supply voltage is within the range of the rated voltage, the counting circuit is controlled to reset the count value Is an initial value.

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