TWI755776B - Display driving device and anti-interference method thereof - Google Patents

Abstract

A display driving device and an anti-interference method thereof are provided. A timing controller outputs a data signal. A source driver detects an interference event according to the data signal, and outputs a feedback signal to the timing controller in response to the detection result of the interference event. The timing controller adjusts the signal strength of the data signal according to the feedback signal.

Description

Display driving device and anti-interference method thereof

The present invention relates to a driving device, and more particularly, to a display driving device and an anti-interference method thereof.

When a mobile phone (or other radio frequency device) is close to the display device, RF noise may cause abnormality on the display screen of the display device.

Further, the timing controller transmits the data signal to the source driver circuit via the transmission line, and the source driver circuit drives the display panel to display the image according to the data signal. When the mobile phone is close to the display device, the radio frequency noise of the mobile phone may interfere with the transmission of the data signal between the timing controller and the source driving circuit. When the energy of the RF noise in the data signal is large enough, the source driver circuit may not properly latch the data signal.

The present invention provides a display driving device and an anti-interference method thereof, which can effectively prevent the display driving device from being unable to drive the display device to display a correct picture due to the interference of radio frequency noise.

The display driving device of the present invention includes a timing controller and a source driver. The timing controller outputs data signals. The source driver is coupled to the timing controller, detects the interference event according to the data signal, and outputs a feedback signal to the timing controller in response to the detection result of the interference event, and the timing controller adjusts the signal strength of the data signal according to the feedback signal.

In an embodiment of the present invention, when the source driver detects that an interference event occurs, the timing controller increases the signal strength of the data signal according to the feedback signal.

In an embodiment of the present invention, the above-mentioned source driver includes a clock data recovery circuit, receives the data signal, and performs a phase-lock operation on the data signal, and the source driver determines whether the clock data recovery circuit locks the data signal according to whether the clock data recovery circuit is locked. A disturbance event occurs.

In an embodiment of the present invention, when the phase-locking operation of the clock data recovery circuit on the data signal leaves the locked state, the source driver determines that an interference event occurs.

In an embodiment of the present invention, the above-mentioned feedback signal is a hardware pin signal or a differential signal.

The anti-interference method of the display driving device of the present invention includes the following steps. Output data signal to source driver. The source driver detects the interference event according to the data signal, and generates a feedback signal according to the detection result of the interference event. The signal strength of the data signal is adjusted according to the feedback signal.

In an embodiment of the present invention, when the source driver detects the occurrence of an interference event, the signal strength of the data signal is increased according to the feedback signal.

In an embodiment of the present invention, the above-mentioned anti-interference method for a display driving device includes: the source driver performs a phase-locking operation on the data signal, and determines whether an interference event occurs according to whether the clock data recovery circuit locks the data signal.

In an embodiment of the present invention, when the phase-locking operation on the data signal is released from the locked state, the source driver determines that a disturbance event occurs.

In an embodiment of the present invention, the above-mentioned feedback signal is a hardware pin signal or a differential signal.

Based on the above, the source driver of the embodiment of the present invention can detect whether an interference event occurs according to the clock embedded data signal output by the timing controller, and provide a feedback signal to the timing controller according to the detection result, and the timing controller can adjust the timing according to the feedback signal. The signal strength of the data signal is embedded in the pulse, so as to prevent the display driving device from being unable to drive the display device to display the correct picture due to the interference of radio frequency noise.

In order to make the above-mentioned features and advantages of the present invention more obvious and easy to understand, the following embodiments are given and described in detail with the accompanying drawings as follows.

FIG. 1 is a schematic diagram of a display driving apparatus according to an embodiment of the present invention, please refer to FIG. 1 . The display driving device may include a timing controller 102 and a source driver 104 . The timing controller 102 is coupled to the source driver 104 . The timing controller 102 can output the data signal SD1 to the source driver 104, and the source driver 104 can detect whether an interference event occurs according to the data signal SD1, for example, whether the data signal is interfered by radio frequency noise and has a phase change. The source driver 104 can output the feedback signal SF to the timing controller 102 according to the result of detecting the interference event, so that the timing controller 102 can adjust the signal strength of the data signal SD1 according to the feedback signal SF.

For example, as shown in the waveform diagram of the data signal shown in FIG. 2 , when the source driver 104 detects the occurrence of an interference event, the timing controller 102 can change the data signal SD1 to the original according to the feedback signal SF provided by the source driver 104 The amplitude A1 is increased, and the data signal SD1 ′ with a larger amplitude ( A2 ) is output to the source driver 104 . Since the data signal SD1' with a larger amplitude has a strong anti-interference ability against radio frequency noise, the source driver 104 can drive the display panel to display the image correctly according to the data signal SD1', and avoid abnormal display images. situation.

In addition, since no interference event occurs during the electromagnetic interference (EMI) test, the timing controller 102 does not increase the signal strength of the data signal SD1 during the electromagnetic interference test. Thus, the display driving device is performing electromagnetic interference testing. During the interference test, it will not emit excessive radiated energy, and it can pass the electromagnetic interference test. During the Electromagnetic Safety (EMS) test, the timing controller 102 can respond to interference events (such as interference of radio frequency noise) to enhance the signal strength of the data signal SD1, so that the display driving device can pass the EMS test. test. Therefore, the display driving device of this embodiment can facilitate the passing of product verification.

FIG. 3 is a schematic diagram of a display driving apparatus according to another embodiment of the present invention. Further, the source driver 104 may include a clock data recovery circuit 302 , and the clock data recovery circuit 302 is coupled to the timing controller 102 . The clock data recovery circuit 302 can receive the data signal SD1 and perform a phase-lock operation on the data signal SD1, and the source driver 104 can determine whether an interference event occurs according to the result of the phase-lock operation of the data signal SD1 by the clock data recovery circuit 302 .

In detail, the clock data recovery circuit 302 can output a feedback signal SF to the timing controller 102 when the phase-lock operation performed on the data signal SD1 is in a loss of lock state, so as to inform the timing controller 102 that interference occurs The event causes the timing controller 102 to increase the signal strength of the data signal SD1. For example, the feedback signal SF can be a hardware pin signal, and the clock data recovery circuit 302 can output the feedback signal SF of a low voltage level when the phase of the data signal SD1 is the same as the phase of the clock signal of the clock data recovery circuit 302 , and when the phase of the data signal SD1 is different from the phase of the clock signal of the clock data recovery circuit 302 , the feedback signal SF of a high voltage level is output. In this way, when the phase of the data signal SD1 is different from the phase of the clock signal of the clock data recovery circuit 302 due to the influence of the radio frequency noise, the timing controller 102 can be informed to increase the signal strength of the data signal SD1 to avoid data The phase of the signal SD1 changes due to the interference of radio frequency noise.

Since the timing controller 102 of this embodiment can directly increase the signal strength of the data signal SD1 according to the feedback signal SF when an interference event occurs, the clock data recovery circuit 302 quickly relocks the data signal SD1 with the increased signal strength. Compared with the prior art in which the timing controller 102 provides training data to the clock data recovery circuit 302 for clock training when the phase-locking operation is unlocked, the display screen is abnormal during the training period. The display driving device of the embodiment can quickly lock the clock data recovery circuit 302 to the correct frequency, thereby effectively preventing the abnormality of the display screen.

It should be noted that, in some embodiments, the feedback signal SF can also be, for example, a differential signal having a first-end signal and a second-end signal. For example, when the first-end signal and the second-end signal are mutually inverted, that is, when the first-end signal and the second-end signal are mutually inverse, it means that no interference event occurs, and when the first-end signal and the second-end signal are mutually inverse An interference event occurs when the two-terminal signals are in phase with each other.

FIG. 4 is a flowchart of an anti-interference method for a display driving device according to an embodiment of the present invention. It can be known from the above embodiments that the anti-interference method for a display driving device may include the following steps. First, output the data signal to the source driver (step S402). Next, the source driver detects the interference event according to the data signal, and generates a feedback signal according to the detection result of the interference event (step S404 ). For example, the source driver can perform a phase-lock operation on the data signal, and determine whether an interference event occurs according to whether the clock data recovery circuit locks the data signal. The pole driver determines that a disturbance event has occurred. Then, the signal strength of the data signal is adjusted according to the feedback signal (step S406 ). For example, when the source driver detects that an interference event occurs, the signal strength of the data signal can be increased according to the feedback signal, so as to prevent the phase of the data signal from being affected by the radio frequency. The interference of noise produces changes. The feedback signal can be, for example, a hard pin signal or a differential signal.

To sum up, the source driver of the present invention can detect whether an interference event occurs according to the clock embedded data signal output by the timing controller, and provide a feedback signal to the timing controller according to the detection result, and the timing controller can adjust the timing according to the feedback signal. The signal strength of the data signal is embedded in the pulse, so as to prevent the display driving device from being unable to drive the display device to display the correct picture due to the interference of radio frequency noise. In addition, since the timing controller of the present invention increases the signal strength of the data signal only when an interference event occurs, the display driving device can easily pass the electromagnetic interference test and the electromagnetic endurance test.

Although the present invention has been disclosed above by the embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, The protection scope of the present invention shall be determined by the scope of the appended patent application.

102: Timing Controller 104: Source driver 302: Clock data recovery circuit A1, A2: Amplitude SD1, SD1’: data signal SF: feedback signal S402~S406: Anti-interference method steps of display driving device

FIG. 1 is a schematic diagram of a display driving apparatus according to an embodiment of the present invention. FIG. 2 is a schematic diagram of a waveform of a data signal according to an embodiment of the present invention. FIG. 3 is a schematic diagram of a display driving apparatus according to another embodiment of the present invention. FIG. 4 is a flowchart of an anti-interference method for a display driving device according to an embodiment of the present invention.

102: Timing Controller 104: Source driver SD1: Data signal SF: feedback signal

Claims (8)

A display driving device, comprising: a timing controller outputting a data signal; and a source driver, coupled to the timing controller, detecting an interference event according to the data signal, and outputting a feedback in response to the detection result of the interference event signal to the timing controller, the timing controller adjusts the signal strength of the data signal according to the feedback signal, wherein when the source driver detects the occurrence of the disturbance event, the timing controller increases the signal strength of the data signal according to the feedback signal signal strength. The display driving device according to claim 1, wherein the source driver comprises: a clock data recovery circuit, which receives the data signal and performs a phase-lock operation on the data signal, and the source driver is based on the clock data Whether the recovery circuit locks the data signal to determine whether the interference event occurs. The display driving device of claim 2, wherein the source driver determines that the disturbance event occurs when the phase-locking operation of the data signal by the clock data recovery circuit is out of the locked state. The display driving device of claim 1, wherein the feedback signal is a hardware pin signal or a differential signal. An anti-interference method for a display driving device, comprising: outputting a data signal to a source driver; the source driver detecting an interference event according to the data signal, and generating a feedback signal according to the detection result of the interference event; and The signal strength of the data signal is adjusted according to the feedback signal, wherein when the source driver detects the occurrence of the interference event, the signal strength of the data signal is increased according to the feedback signal. The anti-jamming method for a display driving device as described in item 5 of the scope of the patent application includes: the source driver performs a phase-locking operation on the data signal, and determines whether the data signal is locked according to whether a clock data recovery circuit locks the data signal. the interference event. The anti-interference method for a display driving device as described in claim 6, wherein the source driver determines that the interference event occurs when the phase-locked operation of the data signal is released from the locked state. The anti-interference method for a display driving device according to claim 6, wherein the feedback signal is a hardware pin signal or a differential signal.

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