Source driving chip, display device and short-circuit protection method thereof

Abstract

The invention provides a source driving chip, a display device and a short-circuit protection method thereof. The display device comprises a display panel and a source electrode driving chip. The source electrode driving chip comprises a plurality of output buffers, at least one voltage detection circuit, a plurality of output switches and at least one short circuit counter. The voltage detection circuit is used for detecting the voltage difference between the input end and the output end of the output buffer and outputting a detection result. The input end of the output switch is electrically connected with the output end of the output buffer, and the output end of the output switch is electrically connected with the output pin of the source electrode driving chip. The short circuit counter is used for counting the number of short-circuited data lines of the display panel according to the detection result of the voltage detection circuit and controlling the on-off state of the output switch according to the counting result. According to the invention, the source driving chip can be prevented from generating overlarge current and overheating due to short circuit of the data line of the display panel, and the safety of the display device is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a source driving chip, a display device and a short circuit protection method thereof. BACKGROUND

[0002] The display panel in the existing display device is exposed outside, and is prone to suffer from external force impact during use.

[0003] The inside of the display panel contains a large number of data lines for transmitting display data signals. When the display panel is broken due to external force impact, accidental electrical connection between adjacent data lines may occur, causing short circuit.

[0004] In the case of data line short circuit, the current output by the source driving chip in the display device will significantly increase, and the generated heat will also increase. If the number of short-circuited data lines is large, the heat problem of the source driving chip will become more serious. Long-term overheating operation not only affects the normal work of the display device, but also may threaten the safety of the display device.

[0005] The current source driving chip lacks effective protection measures to deal with the data line short circuit problem of the display panel. When the data line of the display panel is short-circuited, the source driving chip cannot timely identify this abnormal condition, nor can it take corresponding protection actions, resulting in the source driving chip continuously working in a large current state, which exists a safety hazard.

[0006] Therefore, it is necessary to provide a new technical scheme to solve the above technical problems. SUMMARY

[0007] The purpose of the present application is to provide a source driving chip, a display device and a short circuit protection method thereof, which aims to solve the technical problem that the existing technology cannot timely identify and take protection measures when the data line of the display panel is short-circuited.

[0008] The application provides a display device, which comprises a display panel and a source driving chip, the display panel comprises a plurality of data lines, and an output pin of the source driving chip is electrically connected with the data lines of the display panel, the source driving chip comprises: a plurality of output buffers; at least one voltage detection circuit, two input ends of the voltage detection circuit are electrically connected with an input end and an output end of the output buffer respectively, the voltage detection circuit is used for detecting a voltage difference between the input end and the output end of at least one output buffer and outputting a detection result; a plurality of output switches, an input end of the output switch is electrically connected with an output end of the output buffer, and an output end of the output switch is electrically connected with the output pin of the source driving chip; and at least one short-circuit counter, the short-circuit counter is electrically connected with an output end of at least one voltage detection circuit and a control end of a plurality of output switches, and the short-circuit counter is used for counting the number of short-circuited data lines of the display panel according to the detection result of the voltage detection circuit and controlling the output switch according to the counting result.

[0009] In the display device, the voltage detection circuit is used for outputting one of a first level signal and a second level signal when the voltage difference between the input voltage and the output voltage of the output buffer is greater than a preset voltage threshold, and outputting the other of the first level signal and the second level signal when the voltage difference between the input voltage and the output voltage of the output buffer is less than or equal to the preset voltage threshold.

[0010] In the display device, the preset threshold is in the range of 0.1V to 1V.

[0011] In the display device, the short-circuit counter is used for outputting a control signal for disconnecting a plurality of output switches to the plurality of output switches when the counting result of the short-circuit counter is greater than or equal to a preset number threshold.

[0012] In the display device, the source driving chip further comprises a serial data receiver, the serial data receiver is used for receiving serial display stage data and blanking stage data, identifying a blanking start signal from the display stage data and the blanking stage data, and triggering the voltage detection circuit to detect the voltage difference between the input end and the output end of the output buffer when the blanking start signal is identified.

[0013] In the display device, the source driving chip comprises n output buffers and m voltage detection circuits, wherein m≤n.

[0014] In the display device, 1≤n / m≤12.

[0015] This application also provides a source driver chip, comprising: a plurality of output buffers; at least one voltage detection circuit, the two input terminals of which are electrically connected to the input and output terminals of the output buffers respectively, the voltage detection circuit being used to detect the voltage difference between the input and output terminals of at least one of the output buffers and output the detection result; a plurality of output switches, the input terminals of which are electrically connected to the output terminals of one of the output buffers, and the output terminals of which are electrically connected to the output pins of the source driver chip; and at least one short-circuit counter, the short-circuit counter being electrically connected to the output terminals of at least one of the voltage detection circuits and electrically connected to the control terminals of the plurality of output switches, the short-circuit counter being used to count the number of short-circuit points according to the detection result of the voltage detection circuits, and to control the output switches according to the counting result.

[0016] In the aforementioned source driver chip, the voltage detection circuit is used to output one of a first level signal and a second level signal when the voltage difference between the input voltage and the output voltage of the output buffer is greater than a preset voltage threshold, and to output the other of the first level signal and the second level signal when the voltage difference between the input voltage and the output voltage of the output buffer is less than or equal to the preset voltage threshold.

[0017] In the aforementioned source driver chip, the preset threshold is in the range of 0.1V to 1V.

[0018] In the aforementioned source driver chip, the short-circuit counter is used to output a control signal to disconnect multiple output switches when the counting result of the short-circuit counter is greater than or equal to a preset number threshold.

[0019] In the aforementioned source driver chip, the source driver chip further includes a serial data receiver, which is used to receive serial display stage data and blanking stage data, identify a blanking start signal from the display stage data and the blanking stage data, and trigger the voltage detection circuit to detect the voltage difference between the input and output terminals of the output buffer when the blanking start signal is identified.

[0020] In the aforementioned source driver chip, the source driver chip includes n output buffers and m voltage detection circuits, where m≤n.

[0021] In the aforementioned source driver chip, 1≤n / m≤12.

[0022] This application also provides a short-circuit protection method for a display device, the method comprising: detecting the voltage difference between the input and output terminals of at least one output buffer in the source driver chip of the display device, and outputting the detection result; counting the number of short-circuited data lines of the display device according to the detection result; and controlling the output switch of the source driver chip according to the counting result.

[0023] In the above short-circuit protection method, the detection result includes a first level signal and a second level signal; the step of detecting the voltage difference between the input and output terminals of at least one output buffer in the source driver chip of the display device and outputting the detection result includes: outputting one of the first level signal and the second level signal when the voltage difference between the input and output terminals of the output buffer is greater than a preset voltage threshold, and outputting the other of the first level signal and the second level signal when the voltage difference between the input and output terminals of the output buffer is less than or equal to the preset voltage threshold.

[0024] In the above short-circuit protection method, the preset threshold is in the range of 0.1V to 1V.

[0025] In the above short-circuit protection method, the step of counting the number of short-circuit points on the display panel of the display device based on the detection result includes: counting based on the number of one of the received first level signal and the second level signal.

[0026] In the above short-circuit protection method, the step of controlling the output switch of the source driver chip according to the counting result includes: when the number of short-circuit points is greater than or equal to a preset number threshold, outputting a control signal to disconnect the multiple output switches.

[0027] In the above short-circuit protection method, before the step of detecting the voltage difference between the input and output terminals of at least one output buffer in the source driver chip of the display device and outputting the detection result, the method includes: receiving serial display stage data and blanking stage data; and identifying a blanking start signal from the display stage data and the blanking stage data; the step of detecting the voltage difference between the input and output terminals of at least one output buffer in the source driver chip of the display device and outputting the detection result is: detecting the voltage difference between the input and output terminals of the output buffer when the blanking start signal is identified, and outputting the detection result.

[0028] The display device provided in this application effectively solves the technical problem that existing technologies cannot promptly identify and take protective measures when the data lines of the display panel are short-circuited by introducing a voltage detection circuit, a short-circuit counter, and an output switch into the source driver chip.

[0029] The display device of this application includes a voltage detection circuit. The two input terminals of this voltage detection circuit are electrically connected to the input and output terminals of an output buffer, respectively, for detecting the voltage difference between the input and output terminals of the output buffer. When a short circuit occurs in the data line of the display panel, the output voltage of the corresponding output buffer will deviate from its normal value due to the short circuit loop, resulting in a significant difference from the input voltage. By monitoring this voltage difference change in real time, the voltage detection circuit can accurately identify the occurrence of a short circuit in the data line. When the voltage difference exceeds a preset voltage threshold, the voltage detection circuit outputs a corresponding detection result signal, achieving timely detection of the short circuit state. This voltage difference detection method can directly reflect abnormal operating conditions of the output buffer, thus enabling short circuit identification.

[0030] The short-circuit counter in this application is electrically connected to the output of a voltage detection circuit and is used to count the number of short-circuited data lines on the display panel based on the detection results of the voltage detection circuit. By counting the number of abnormal signals received, the short-circuit counter can accurately assess the severity of the short circuit on the display panel. When a single data line is short-circuited, the heat generated by the source driver chip is relatively limited, but when multiple data lines are short-circuited simultaneously, the superimposed short-circuit current causes the temperature of the source driver chip to rise sharply. The short-circuit counter, through its cumulative counting function, can distinguish between different degrees of short circuit and determine whether to take protective measures. This technical solution avoids triggering sensitive protection due to a single-point short circuit, while ensuring timely response in the event of a severe short circuit.

[0031] The output switches in this application are located between the output buffer and the output pins of the source driver chip. A short-circuit counter is electrically connected to the control terminals of multiple output switches, used to control the on / off state of the output switches based on the counting result. When the counting result of the short-circuit counter reaches or exceeds a preset threshold, the short-circuit counter outputs control signals to multiple output switches, causing the output switches to open, thereby cutting off the electrical connection between the output buffer and the display panel data lines. This disconnection operation can fundamentally prevent the generation of short-circuit current, avoiding the source driver chip from continuously operating under high current conditions. Through physical disconnection, even if there are multiple short circuits in the display panel, the source driver chip will not bear excessive current load, effectively preventing safety hazards caused by overheating.

[0032] The serial data receiver of this application can identify the blanking start signal from the received display stage data and blanking stage data, and trigger the voltage detection circuit to detect the voltage difference when the blanking start signal is detected. The blanking stage is a non-display period in the display timing. Short-circuit detection during this period will not affect the normal display output, ensuring that the implementation of the short-circuit detection function will not interfere with the display effect. This technical solution allows the short-circuit detection function to be activated at the appropriate time, ensuring both the accuracy of detection and no interference with normal display operation. Attached Figure Description

[0033] Figure 1 A schematic diagram of a display device provided for an embodiment of this application.

[0034] Figure 2 A schematic diagram of a source driver chip provided for an embodiment of this application.

[0035] Figure 3 This is a schematic diagram of the serial display stage data and blanking stage data received by the source driver chip provided in an embodiment of this application. Detailed Implementation

[0036] The specific embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0037] The terms “first,” “second,” and similar words do not indicate any order, quantity, or importance, but are merely used to distinguish different technical features. The terms “multiple,” and similar words mean two or more, unless otherwise expressly specified.

[0038] The embodiments of this application can be combined with each other.

[0039] This application provides a source driver chip, a display device, and a short-circuit protection method thereof. When a display device is subjected to an external impact during use, causing the display panel to crack, a short circuit may occur between adjacent data lines inside the display panel. This can lead to the source driver chip outputting a large current and generating severe heat, posing a fire hazard if it operates under overheating for an extended period. The technical solution provided in this application adds a voltage detection circuit and a short-circuit counter to the source driver chip, enabling timely detection of data line short circuits and the implementation of corresponding protective measures.

[0040] The display device of this application may be, for example, an LCD display device, an OLED display device, a Mini-LED display device, or a Micro-LED display device. The following description uses an LCD display device as an example.

[0041] The display device includes a liquid crystal display panel, a timing controller, a source driver chip, and a power management chip. The power management chip can be integrated with the timing controller into the same chip.

[0042] The liquid crystal display panel includes a display area and a non-display area. The display area has an array of m×n pixels, where m and n are integers greater than 1. The non-display area is located around the display area and is used to house the gate drive signal generation circuit and various signal lines. The display panel also includes multiple gate lines and multiple data lines DL. The multiple gate lines extend along a first direction and are arranged along a second direction, and the multiple data lines DL extend along the second direction and are arranged along the first direction, with the first direction perpendicular to the second direction. The gate drive signal generation circuit is located in the non-display area and is electrically connected to the multiple gate lines.

[0043] The display panel includes a thin-film transistor array substrate, a counter substrate, and a liquid crystal layer disposed between the two substrates. The thin-film transistor array substrate includes a first glass substrate, a first metal layer disposed on the first glass substrate, a gate insulating layer disposed on the first metal layer, a semiconductor layer disposed on the gate insulating layer, a second metal layer disposed on the semiconductor layer, a passivation layer disposed on the second metal layer, and pixel electrodes disposed on the passivation layer. The first metal layer includes gate lines, gate electrodes, etc. The second metal layer includes data lines (DL), source electrodes, drain electrodes, etc. The counter substrate includes a second glass substrate, a black matrix disposed on the second glass substrate, a color filter layer disposed on the black matrix, and a common electrode disposed on the color filter layer. The color filter layer may also be disposed on the thin-film transistor array substrate.

[0044] Each pixel includes at least one thin-film transistor (TFT) and a pixel electrode. The gate of the TFT is electrically connected to the corresponding gate line, the source is electrically connected to the corresponding data line DL, and the drain is electrically connected to the corresponding pixel electrode. When the gate line outputs a high-level scan signal, the TFT is turned on, and the data signal on the data line DL is transmitted to the pixel electrode through the TFT; when the gate line outputs a low-level scan signal, the TFT is turned off, and the pixel electrode maintains the voltage corresponding to the data signal.

[0045] The gate drive signal generation circuit includes n cascaded gate drive sub-circuits, each of which is electrically connected to a gate line. The gate drive sub-circuits sequentially output scan signals, scanning each row of pixels in the display area line by line.

[0046] The timing controller receives and processes externally input image data and timing signals, generates control signals, and transmits the image data to the source driver chip. The power management chip provides operating voltage to all parts of the display device. Under the control of the timing controller, the gate driver sub-circuit sequentially outputs scan signals, scanning each row of pixels in the display area line by line. Under the control of the timing controller, the source driver chip generates and outputs data signals based on the image data.

[0047] like Figure 1As shown, the display device provided in the embodiments of this application includes a display panel and a source driver chip. The display panel includes multiple data lines DL, and the output pins of the source driver chip are electrically connected to the data lines DL of the display panel. Figure 2 As shown, the source driver chip includes a serial data receiver, a shift register, a data register, a data latch, a level converter, a digital-to-analog converter, multiple output buffers, at least one voltage detection circuit, multiple output switches K1 to Kn, and at least one short-circuit counter.

[0048] Specifically, the source driver chip includes multiple output buffers, at least one voltage detection circuit, multiple output switches K1 to Kn, and at least one short-circuit counter. The two input terminals of the voltage detection circuit are electrically connected to the input and output terminals of the output buffers, respectively. The voltage detection circuit is used to detect the voltage difference between the input and output terminals of at least one output buffer and output the detection result. The input terminals of output switches K1 to Kn are electrically connected to the output terminals of one output buffer, and the output terminals of output switches K1 to Kn are electrically connected to the output pins of the source driver chip. The short-circuit counter is electrically connected to the output terminal of at least one voltage detection circuit and to the control terminals of the multiple output switches K1 to Kn. The short-circuit counter is used to count the number of short-circuit points based on the detection results of the voltage detection circuits and to control the output switches K1 to Kn based on the counting results.

[0049] like Figure 2 and Figure 3 As shown, a serial data receiver receives high-speed serial signals from a timing controller or system-on-a-chip (SoC), including serial display and blanking phase data. The serial data receiver outputs the received data to a data buffer. A shift register also outputs data to the data buffer. The output of the data buffer is electrically connected to the input of a data latch. The data buffer receives data from the serial data receiver and the shift register and outputs the data to the data latch. The output of the data latch is electrically connected to the input of a level converter. The data latch outputs the received data to the level converter. The output of the level converter is electrically connected to the input of a digital-to-analog converter (DAC). The level converter performs level conversion on the received data and outputs the converted data to the DAC. The output of the DAC is electrically connected to the input of an output buffer. The DAC converts the digital signal to an analog signal and outputs the converted analog signal to the corresponding output buffer.

[0050] The source driver chip includes n output buffers, where n is a positive integer. Each output buffer receives an analog signal from the digital-to-analog converter and performs buffered amplification on the analog signal. For example... Figure 1 As shown, the source driver chip also includes multiple output switches K1 to Kn. The input terminals of the output switches K1 to Kn are electrically connected to the output terminals of the output buffer, the output terminals of the output switches K1 to Kn are electrically connected to the output pins of the source driver chip, and the output pins of the source driver chip are electrically connected to the data line DL of the display panel.

[0051] The source driver chip includes m voltage detection circuits, where m is a positive integer and m is less than or equal to n. The two input terminals of each voltage detection circuit are electrically connected to the input and output terminals of the output buffers, respectively. The voltage detection circuits are used to detect the voltage difference between the input and output terminals of at least one output buffer and output the detection result. Depending on the size of the display panel and the expected minimum crack impact range, one voltage detection circuit is configured for every 12 output buffers. In one embodiment, the ratio of n to m is in the range of 1 to 12, meaning each voltage detection circuit can detect a maximum of 12 output buffers. In the event of a channel short circuit caused by display panel damage, the damage will not only affect the location corresponding to one channel. The number of channels corresponding to the minimum crack varies for different sized display panels. Based on actual test results, a maximum of one voltage detection circuit is configured for every 12 buffers.

[0052] The voltage detection circuit is a voltage comparator used to compare the input voltage and the output voltage of the output buffer. The voltage detection circuit outputs either a first-level signal or a second-level signal when the voltage difference between the input and output voltages of the output buffer is greater than a preset voltage threshold, and outputs the other of the first-level signal and the second-level signal when the voltage difference between the input and output voltages of the output buffer is less than or equal to the preset voltage threshold. The first-level signal is either a high-level signal or a low-level signal, and the second-level signal is either a high-level signal or a low-level signal. The preset voltage threshold is in the range of 0.1V to 1V. In one specific embodiment, the preset voltage threshold is 0.2V. When the voltage difference between the input and output terminals of the output buffer is greater than 0.2V, the voltage detection circuit outputs a first-level signal, indicating that there is a short circuit on the corresponding data line DL.

[0053] The source driver chip also includes at least one short-circuit counter, which is electrically connected to the output of at least one voltage detection circuit and to the control terminals of multiple output switches K1 to Kn. The short-circuit counter is used to count the number of short-circuited data lines DL of the display panel based on the detection result of the voltage detection circuit, and to control the output switches K1 to Kn based on the counting result. The short-circuit counter receives a first-level signal from the voltage detection circuit, counts the first-level signal, and accumulates the count. The short-circuit counter is used to output a control signal to the multiple output switches K1 to Kn to disconnect the multiple output switches K1 to Kn when the count result of the short-circuit counter is greater than or equal to a preset threshold value. In one specific embodiment, the preset threshold value is 12. When the count value of the short-circuit counter reaches the preset threshold value, the short-circuit counter outputs a control signal to disconnect the multiple output switches K1 to Kn, thereby cutting off the electrical connection between the output buffer and the output pins of the source driver chip.

[0054] Each output switch K1 to Kn corresponds to an output buffer, used to control the electrical connection state between the output buffer and the output pin of the source driver chip. When the output switches K1 to Kn receive a disconnect control signal from the short-circuit counter, the output switches K1 to Kn disconnect, cutting off the electrical connection between the output buffer and the display panel data line DL, thereby preventing short-circuit current from continuing to flow through the source driver chip.

[0055] The serial data receiver is also used to receive serial display phase data and blanking phase data, identify the blanking start signal from the display phase data and blanking phase data, and trigger a voltage detection circuit to detect the voltage difference between the input and output terminals of the output buffer when the blanking start signal is identified. Figure 3 As shown, the blanking start signal is defined according to the transmission protocol. For example, in a point-to-point transmission protocol, when the serial data receiver receives the command CMD3, it identifies this command as the blanking start signal. The specific format of the blanking start signal is a 9-bit binary number 110000001. When the serial data receiver recognizes the blanking start signal, it triggers the voltage detection circuit to start the voltage difference detection function.

[0056] In the display timing sequence, the display phase data is used to display the image on the display panel, while the blanking phase data is for non-display phases. The blanking phase is the time period during which the timing controller or on-chip system chip processes and prepares data. The voltage detection circuit initiates voltage difference detection during the blanking phase to ensure that the short-circuit detection function does not interfere with normal display output. The serial data receiver is responsible for receiving and identifying data. After receiving serial data, it identifies each received data entry according to the transmission protocol and then processes it accordingly based on the requirements of each data entry.

[0057] The source driver chip internally stores a threshold number of short-circuit channels, and a short-circuit counter counts the number of short-circuit channels. When detecting the input-output voltage for each output buffer, if the voltage difference between the input and output terminals exceeds 0.2V, the short-circuit counter increments by one. When the count value of the short-circuit counter reaches the pre-stored threshold, the source driver chip considers that there is a short circuit in the data line DL of the display panel. The short-circuit counter outputs a control signal to control at least one output switch K1 to Kn to disconnect the output buffer in the source driver chip from the data line DL of the display panel.

[0058] The preset threshold number is set based on the total number of channels and thermal characteristics of the source driver chip. For a source driver chip with 960 channels, when 10 data lines (DL) are short-circuited, the temperature of the source driver chip will rise by 3 to 5 degrees Celsius. A short circuit in one channel of the display panel means that the output buffer will have a relatively large short-circuit current. Actual measurements show that a short circuit in one channel increases the output buffer current by 1 to 2 mA, and this large current will cause the source driver chip to heat up. The preset threshold number is set to a multiple of 10, such as 10, 20, 30, etc., and the selection should be made according to the sensitivity requirements of short-circuit detection. When short-circuit detection is too sensitive, the preset threshold number can be set larger; when short-circuit detection is not sensitive enough, the preset threshold number can be set smaller.

[0059] The specific implementation process is as follows: The serial data receiver receives display stage data and blanking stage data line by line from the timing controller or on-chip system chip. Each line of data has a start signal to identify whether the line data is display stage data or blanking stage data. After the display panel data line DL short-circuit detection function is enabled, the source driver chip recognizes the blanking start signal and will start the voltage detection circuit to detect the input and output voltage of the output buffer inside the source driver chip. At the same time, the voltage detection circuit outputs the detection result to the short-circuit counter according to the voltage detection situation. The short-circuit counter accumulates the number of short-circuit channels according to the received detection results. When the number of short-circuit channels reaches a preset threshold, it indicates that there are multiple data channels in the display panel that are short-circuited. This will generate a large current, causing the source driver chip to overheat and potentially catch fire. The short-circuit counter will output a control signal to disconnect the connection between each output buffer in the output source driver chip and the display panel data line DL, ensuring that the source driver chip does not overheat due to a large current.

[0060] Embodiments of this application also provide a short-circuit protection method for a display device. The method includes detecting the voltage difference between the input and output terminals of at least one output buffer in the source driver chip of the display device and outputting the detection result; counting the number of short-circuited data lines DL of the display device based on the detection result; and controlling the output switches K1 to Kn of the source driver chip based on the counting result.

[0061] The detection results include a first-level signal and a second-level signal.

[0062] The steps of detecting the voltage difference between the input and output terminals of at least one output buffer in the source driver chip of the display device and outputting the detection result include: When the voltage difference between the input and output voltages of the output buffer exceeds a preset voltage threshold, one of the first-level signal and the second-level signal is output.

[0063] When the voltage difference between the input voltage and the output voltage of the output buffer is less than or equal to a preset voltage threshold, the other of the first level signal and the second level signal is output.

[0064] The steps for counting the number of short circuit points on the display panel of the display device based on the detection results include: The count is performed based on the number of either the first level signal or the second level signal received.

[0065] The steps for controlling the output switches K1 to Kn of the source driver chip based on the counting results include: If the number of short-circuit points is greater than or equal to a preset threshold, control signals to disconnect multiple output switches K1 to Kn are output to multiple output switches K1 to Kn.

[0066] Before the step of detecting the voltage difference between the input and output terminals of at least one output buffer in the source driver chip of the display device and outputting the detection result, the method includes: Receives serial display phase data and blanking phase data.

[0067] Identify the blanking start signal from the display phase data and the blanking phase data.

[0068] The steps for detecting the voltage difference between the input and output terminals of at least one output buffer in the source driver chip of the display device and outputting the detection result are as follows: When a blanking start signal is detected, the voltage difference between the input and output terminals of the output buffer is detected and the detection result is output.

[0069] The technical solution of this application is applicable to electronic devices such as televisions and monitors with 4K 60Hz, 4K 120Hz, 4K 144Hz, 4K 165Hz, 4K 180Hz, and 8K 120Hz resolutions.

[0070] Through the above technical solution, this application can detect and protect the display panel in a timely manner when the data line DL is short-circuited, which can effectively prevent the source driver chip from overheating due to continuous high current, thereby preventing the source driver chip from overheating and causing a fire, and improving the safety and reliability of the display device.

[0071] The embodiments of this application have been described in detail above. The content of this specification should not be construed as limiting the scope of protection of this application.

Claims

1. A display device, characterized in that, The display device includes a display panel and a source driver chip. The display panel includes multiple data lines, and the output pins of the source driver chip are electrically connected to the data lines of the display panel. The source driver chip includes: Multiple output buffers; At least one voltage detection circuit, wherein two input terminals of the voltage detection circuit are electrically connected to the input and output terminals of the output buffer, respectively, and the voltage detection circuit is used to detect the voltage difference between the input and output terminals of at least one of the output buffers and output the detection result. Multiple output switches, wherein the input terminals of the output switches are electrically connected to the output terminals of the output buffers, and the output terminals of the output switches are electrically connected to the output pins of the source driver chip; and At least one short-circuit counter is electrically connected to the output terminal of at least one of the voltage detection circuits and to the control terminals of a plurality of the output switches. The short-circuit counter is used to count the number of short-circuited data lines of the display panel according to the detection result of the voltage detection circuit, and to control the output switches according to the counting result.

2. The display device according to claim 1, characterized in that, The voltage detection circuit is used to output one of a first level signal and a second level signal when the voltage difference between the input voltage and the output voltage of the output buffer is greater than a preset voltage threshold, and to output the other of the first level signal and the second level signal when the voltage difference between the input voltage and the output voltage of the output buffer is less than or equal to the preset voltage threshold.

3. The display device according to claim 2, characterized in that, The preset threshold is in the range of 0.1V to 1V.

4. The display device according to claim 1, characterized in that, The short-circuit counter is used to output a control signal to disconnect multiple output switches when the counting result of the short-circuit counter is greater than or equal to a preset quantity threshold.

5. The display device according to claim 1, characterized in that, The source driver chip also includes a serial data receiver, which is used to receive serial display stage data and blanking stage data, identify a blanking start signal from the display stage data and the blanking stage data, and trigger the voltage detection circuit to detect the voltage difference between the input and output terminals of the output buffer when the blanking start signal is identified.

6. The display device according to claim 1, characterized in that, The source driver chip includes n output buffers and m voltage detection circuits, where m≤n.

7. The display device according to claim 6, characterized in that, 1≤n / m≤12.

8. A source driver chip, characterized in that, The source driver chip includes: Multiple output buffers; At least one voltage detection circuit, wherein two input terminals of the voltage detection circuit are electrically connected to the input and output terminals of the output buffer, respectively, and the voltage detection circuit is used to detect the voltage difference between the input and output terminals of at least one of the output buffers and output the detection result. Multiple output switches, wherein the input terminal of each output switch is electrically connected to the output terminal of an output buffer, and the output terminal of each output switch is electrically connected to the output pin of the source driver chip; and At least one short-circuit counter is electrically connected to the output terminal of at least one of the voltage detection circuits and to the control terminals of a plurality of the output switches. The short-circuit counter is used to count the number of short-circuit points based on the detection results of the voltage detection circuits and to control the output switches based on the counting results.

9. The source driver chip according to claim 8, characterized in that, The voltage detection circuit is used to output one of a first level signal and a second level signal when the voltage difference between the input voltage and the output voltage of the output buffer is greater than a preset voltage threshold, and to output the other of the first level signal and the second level signal when the voltage difference between the input voltage and the output voltage of the output buffer is less than or equal to the preset voltage threshold.

10. The source driver chip according to claim 9, characterized in that, The preset threshold is in the range of 0.1V to 1V.

11. The source driver chip according to claim 8, characterized in that, The short-circuit counter is used to output a control signal to disconnect multiple output switches when the counting result of the short-circuit counter is greater than or equal to a preset quantity threshold.

12. The source driver chip according to claim 8, characterized in that, The source driver chip also includes a serial data receiver, which is used to receive serial display stage data and blanking stage data, identify a blanking start signal from the display stage data and the blanking stage data, and trigger the voltage detection circuit to detect the voltage difference between the input and output terminals of the output buffer when the blanking start signal is identified.

13. The source driver chip according to claim 8, characterized in that, The source driver chip includes n output buffers and m voltage detection circuits, where m≤n.

14. The source driver chip according to claim 13, characterized in that, 1≤n / m≤12.

15. A short-circuit protection method for a display device, characterized in that, The method includes: The voltage difference between the input and output terminals of at least one output buffer in the source driver chip of the display device is detected, and the detection result is output. The number of short-circuited data lines of the display device is counted based on the detection results; and The output switch of the source driver chip is controlled based on the counting results.

16. The short-circuit protection method according to claim 15, characterized in that, The detection results include a first-level signal and a second-level signal; The step of detecting the voltage difference between the input and output terminals of at least one output buffer in the source driver chip of the display device and outputting the detection result includes: When the voltage difference between the input voltage and the output voltage of the output buffer is greater than a preset voltage threshold, one of a first level signal and a second level signal is output; when the voltage difference between the input voltage and the output voltage of the output buffer is less than or equal to the preset voltage threshold, the other of the first level signal and the second level signal is output.

17. The short-circuit protection method according to claim 16, characterized in that, The preset threshold is in the range of 0.1V to 1V.

18. The short-circuit protection method according to claim 15, characterized in that, The step of counting the number of short-circuit points on the display panel of the display device based on the detection results includes: The count is performed based on the number of either the first level signal or the second level signal received.

19. The short-circuit protection method according to claim 15, characterized in that, The step of controlling the output switch of the source driver chip based on the counting result includes: If the number of short-circuit points is greater than or equal to a preset threshold, a control signal is output to the multiple output switches to disconnect the multiple output switches.

20. The short-circuit protection method according to claim 15, characterized in that, Before the step of detecting the voltage difference between the input and output terminals of at least one output buffer in the source driver chip of the display device and outputting the detection result, the method includes: Receives serial display phase data and blanking phase data; and The blanking start signal is identified from the display phase data and the blanking phase data; The step of detecting the voltage difference between the input and output terminals of at least one output buffer in the source driver chip of the display device and outputting the detection result is as follows: When the blanking start signal is detected, the voltage difference between the input and output terminals of the output buffer is detected, and the detection result is output.

Images