Display module drive testing device based on RSDS differential signals

Abstract

The invention discloses a display module drive testing device based on RSDS differential signals. An upper computer edits and stores configuration parameters and picture parameters for testing a display module; the processing chip comprises a control signal generation module and a data generation and output module, the control signal generation module is used for receiving configuration parameters to generate RSDS driving signals, and the data generation and output module is used for receiving picture parameters to generate TTL-RGB signals; the signal input end of the driving module is connected with the processing chip, the signal output end of the driving module is connected with the display module, the driving module comprises a plurality of RSDS differential converters, each RSDS differential converter is connected with the data generation and output module through the signal input end, and the RSDS differential converters are further connected with the display module through the signal output end to realize RSDS differential signals. According to the invention, RSDS differential signals can be output to drive the display module, the influence caused by noise and electromagnetic interference sensitivity is effectively reduced, and the driving quality is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of display module testing, and in particular to a display module driving test device based on RSDS differential signals. Background Art

[0002] With the rapid development of the electronic automobile industry in recent years, the application fields of in-vehicle display modules have become increasingly extensive and diversified, covering multiple aspects from central control platforms to instrument panel displays, 3D parking assistance, in-vehicle entertainment systems, and even autonomous driving information display. This trend has not only driven the rapid growth of demand for display modules, but also put forward more stringent requirements on their performance, including high reliability, flexibility in shape design, and significant improvement in display quality, that is, higher clarity, stability, and anti-interference ability.

[0003] Specifically, the market's pursuit of display module image clarity has directly led to a significant increase in resolution, which in turn requires driving technology to be able to transmit larger amounts of data at a higher frequency. To meet this demand, modern LCD monitors often need to have a total bandwidth that reaches or even exceeds the 5Gbps level, and this demand is still growing. Traditional technology mainly relies on CMOS interface technology to drive display modules, which is difficult to meet current needs.

[0004] In addition, in the production and quality control process of display modules, high-temperature aging testing is an indispensable part. It can effectively simulate the high-temperature environment that the display module may encounter during long-term use to evaluate its durability and reliability. Traditional testing technology mainly relies on CMOS interface technology to drive the display module for testing. Although this technology can meet basic needs in the low-resolution era, with the rapid development of display module technology, especially the sharp increase in resolution and bandwidth requirements, the limitations of CMOS interface technology have gradually emerged. Specifically, when processing high-resolution image data, the transmission bandwidth is insufficient, and it is difficult to ensure the integrity and real-time nature of the data, which in turn affects the accuracy and reliability of the test results. In addition, CMOS interface technology may also have problems such as signal attenuation and sensitivity to electromagnetic interference, which further limits its application in modern high-performance display module testing. Summary of the invention

[0005] The purpose of the present invention is to provide a display module driving test device based on RSDS differential signal to solve the problem in the prior art that when testing the display module, the traditional CMOS interface technology is difficult to process high-resolution image data and is prone to signal attenuation and electromagnetic interference sensitivity.

[0006] To achieve one of the above-mentioned purposes, an embodiment of the present invention provides a device comprising: a host computer for editing and storing configuration parameters and picture parameters for testing a display module;

[0007] A processing chip is communicatively connected with the host computer, the processing chip includes a control signal generating module and a data generating and outputting module, the control signal generating module is used to receive the configuration parameters and generate an RSDS driving signal, the data generating and outputting module is used to receive the picture parameters and generate a TTL-RGB signal, the RSDS driving signal includes a differential clock, an RSDS horizontal signal and an RSDS vertical signal;

[0008] A driving module, wherein the signal input end of the driving module is connected to the processing chip, and the signal output end of the driving module is used to connect to the display module. The driving module includes multiple RSDS differential converters, each of which is connected to the data generation and output module through the signal input end to receive the TTL-RGB signal, the differential clock, the RSDS horizontal signal and the RSDS vertical signal. The RSDS differential converter is also connected to the display module through the signal output end to drive the display module to display a picture through the RSDS differential signal, wherein the RSDS horizontal signal is used to indicate that the TTL-RGB signal displays a picture on the display module along the horizontal direction, and the RSDS vertical signal is used to indicate that the TTL-RGB signal displays a picture on the display module along the vertical direction.

[0009] As a further improvement of the present invention, the device also includes: the picture parameters include information of red, green and blue colors; the configuration parameters include power parameters, resolution, refresh rate, signal type, vertical signal count times and horizontal signal count times.

[0010] As a further improvement of the present invention, the device further comprises: the TTL-RGB signal comprises 6-bit R data representing red information, 6-bit G data representing green information and 6-bit B data representing blue information;

[0011] The data generation and output module is configured to output two-by-two paired R data, two-by-two paired G data, two-by-two paired B data, and the differential clock in time-division multiplexing;

[0012] The RSDS differential converter is configured to convert the paired signals output by the data generation and output module into RSDS differential signals.

[0013] As a further improvement of the present invention, the device further includes: the RSDS driving signal also includes a test clock, and the test clock is used to instruct the driving module to drive the display module.

[0014] As a further improvement of the present invention, the device further includes: a Flash memory, the Flash memory is configured to store the picture parameters in the host computer, and the processing chip is connected to the Flash memory to obtain the picture parameters. The driving module includes multiple, the processing chip includes a multi-channel module, the multi-channel module has an input end and corresponding multiple output ends, the input end of the multi-channel module receives the RSDS driving signal and the TTL-RGB signal, and the multiple output ends of the multi-channel module are respectively connected to the signal input ends of multiple driving modules;

[0015] Each of the driving modules receives the same RSDS driving signal and the TTL-RGB signal, and each of the driving modules is used to connect to one of the display modules.

[0016] As a further improvement of the present invention, the device further includes: a power module, and the power module is connected to the host computer, the processing chip and the driving module.

[0017] As a further improvement of the present invention, the device also includes: the driving module includes a scaled voltage module, the driving module includes a power input terminal and a power output terminal, the input terminal of the scaled voltage module receives voltage through the power input terminal, the scaled voltage module is used to generate a scaled voltage, and the output terminal of the scaled voltage module is connected to the display module through the power output terminal to output the scaled voltage to the display module.

[0018] As a further improvement of the present invention, the device also includes: the driving module includes a backlight control module, the driving module includes a power input terminal and a backlight output terminal, the input terminal of the backlight control module receives a voltage through the power input terminal, the backlight control module is used for driving the voltage, the output terminal of the backlight control module is connected to an LED module through the backlight output terminal, and the LED module is arranged in the display module and is used to control the brightness of the display module.

[0019] As a further improvement of the present invention, the device also includes: the backlight control module includes a voltage divider circuit and a voltage follower circuit, the input end of the voltage divider circuit receives the power supply voltage, the output end of the voltage divider circuit is coupled to the control end of the voltage follower circuit, and the voltage divider circuit is configured to output a voltage proportional to the power supply voltage; the input end of the voltage follower circuit is coupled to the negative end of the LED module, the output end is coupled to the ground end, and the voltage follower circuit is configured to control the brightness of the LED module according to the voltage output by the voltage divider circuit.

[0020] Compared with the prior art, the present invention has the following beneficial effects: the processing chip can convert the parameters of the host computer into RSDS driving signals, thereby controlling the driving of the display module by the driving module; the processing chip can also produce TTL-RGB signals and differential clocks, and cooperate with the RSDS differential converter in the driving module to convert them into RSDS differential signals, thereby differentially driving the display module, which can effectively reduce the influence of noise, signal attenuation, and electromagnetic interference sensitivity, further improve the driving quality, and can also meet the transmission of high-resolution image data, and improve the accuracy and reliability of the test during the test process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of an RSDS differential signal carrying and outputting an RGB signal in one embodiment of the present invention.

[0022] Figure 2 4 is a schematic diagram of a display module driving test device based on RSDS differential signal in one embodiment of the present invention.

[0023] Figure 3 1 is a timing relationship diagram of a TTL-RGB signal and an RSDS horizontal signal in one embodiment of the present invention.

[0024] Figure 4 1 is a timing relationship diagram of a TTL-RGB signal and an RSDS vertical signal in one embodiment of the present invention.

[0025] Figures 5 to 7 4 is a timing relationship diagram of various clocks in the RSDS driving signal in one embodiment of the present invention.

[0026] Figure 8 FIG. 4 is a connection structure diagram of a Flash memory in one embodiment of the present invention.

[0027] Fig. 9 1 is a connection structure diagram of a multi-channel module in one embodiment of the present invention.

[0028] Fig.10 1 is a structural diagram of a scale-modulated voltage module and a backlight control module in one embodiment of the present invention.

[0029] Fig.11 1 is a structural diagram of a voltage divider circuit and a voltage follower circuit in one embodiment of the present invention. DETAILED DESCRIPTION

[0030] The present invention will be described in detail below in conjunction with the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional changes made by a person skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0031] For ease of understanding, the following first introduces the relevant terms and concepts involved in the embodiments of the present application:

[0032] TTL-RGB signal is an important part of liquid crystal display technology, mainly involving TTL (TransistorTransistor Logic) interface and RGB (red, green and blue) three-primary color data transmission. TTL interface uses parallel data transmission, that is, each bit of RGB signal is transmitted through a separate data line.

[0033] TTL (Logic Gate Circuit, full name Transistor-Transistor Logic) interface is an interface for transmitting data in parallel. It uses TTL devices manufactured by bipolar technology to generate signals. TTL interface has the characteristics of high speed, low power consumption and a wide variety of varieties, and is widely used in digital integrated circuits. TTL is mainly composed of BJT (Bipolar Junction Transistor, i.e. bipolar junction transistor, transistor K) and resistors, and has the characteristics of fast speed.

[0034] RGB signal refers to the signal combination of three color channels: red (Red), green (Green), and blue (Blue).

[0035] RSDS differential signal (Reduced Swing Differential Signal, micro-swing differential signal) is a bus standard for input panel interface. RSDS differential signal transmits data in serial mode, and the signal trigger is double-edge. The entire bus width contains nine pairs of data signals (RGB) and one pair of clock signals. The RSDS standard defines the characteristics of the transmitter and receiver. Like LVDS, it is also a low-voltage differential signal; except that the voltage swing is smaller at ±200mV and the voltage swing is adjustable (the voltage swing of LVDS signal is ±350mV, which is not adjustable). It consists of a current source that drives the differential line pair, with a current of 2mA (LVDS current is 3.5mA). The current is smaller and the power is lower, so it is called: micro-swing differential signal. Compared with LVDS signal, it has better performance: including acceleration performance, low power consumption and low EMI. RSDS uses a low-voltage differential swing of about ±200mV, which is much lower than that of TTL interface. The source driver using RSDS interface can work at a high-voltage clock rate of 85MHz. In addition to low voltage swing, RSDS also supports differential signal pair architecture, which can suppress EMI generation along fast signal paths. It is often used to transmit connection signals between timing control circuits and LCD source drive circuits with higher requirements. RSDS transmits data in serial mode, and the signal trigger is double-edge. The entire bus width contains nine pairs of data signals (RGB) and one pair of clock signals. For details, please refer to Figure 1 shown.

[0036] A differential clock is a pair of clock signals with a phase difference of 180 degrees, namely, CKP-CKN clock, where CKP represents the positive phase clock signal and CKN represents the negative phase clock signal. Their phase difference is usually 180 degrees, that is, when one signal is high, the other signal is low, and vice versa. CKP and CKN are synchronized in frequency, that is, their period and frequency are the same. CKP and CKN can be used as clock signal sources to provide a stable clock signal for the circuit.

[0037] The test clock is a series of timing signals sent by the test device when driving the display module. The timing signal is used to instruct the driving of the display module, including GSPOI, GCK, COM, CS, VEE, REV, LP, GOE, horizontal and vertical timing signals.

[0038] GSPOI: i / o Gate start pulse signal-input / output gate start pulse signal.

[0039] GCK: Gate clock pulse signal.

[0040] COM: Common electrodedriving Signal input-Common electrode driving signal input.

[0041] CS: CS Signal input-CS signal input.

[0042] VEE:LCD Power Supply of Gate part-LCD power supply of gate part.

[0043] REV:Polarity reversing signal of LCD output-LCD output polarity inversion signal.

[0044] LP:Source data transfer signal input-source data transfer signal input.

[0045] GOE: Gate output enable signal input-Gate output enable signal input.

[0046] The host computer 1 is a computer software system for monitoring and controlling remote devices or systems. It includes an MCU control chip. MCU (Microcontroller Unit) is a single-chip microcomputer that integrates CPU, memory, I / O interface, timer / counter, interrupt system and other functions. MCU controls the operation of external devices by executing programs stored in internal memory. It can communicate with external sensors, actuators and other devices through I / O interfaces, receive input signals and output control signals.

[0047] like Figure 2 As shown, in one embodiment of the present invention, a display module driving test device based on RSDS differential signal is provided. The display module driving test device based on RSDS differential signal includes a host computer 1, a processing chip 2 and a driving module 3.

[0048] In one embodiment, the display module includes a display such as a liquid crystal screen.

[0049] The host computer 1 is used to edit and store configuration parameters and screen parameters for testing the display module.

[0050] The configuration parameters include power supply parameters, resolution, refresh rate, signal type, vertical signal count times and horizontal signal count times. The picture parameters include information of red, green and blue.

[0051] The processing chip 2 is communicatively connected with the host computer 1, and the processing chip 2 includes a control signal generating module 21 and a data generating and outputting module 22, wherein the control signal generating module 21 is used to receive the configuration parameters and generate an RSDS driving signal, and the data generating and outputting module 22 is used to receive the picture parameters and generate a TTL-RGB signal, wherein the RSDS driving signal includes a differential clock, an RSDS horizontal signal and an RSDS vertical signal.

[0052] The control signal generation module 21 generates an RSDS drive signal according to the configuration parameters, so as to obtain the timing signal required by the drive module 3 to drive the display module, thereby facilitating the stable driving of the display module by the drive module 3. The stable operation of the display module can provide a reliable operating environment for subsequent screen display. In this way, the TTL-RGB signal generated by the data generation and output module 22 according to the screen parameters can be displayed on the display module.

[0053] In one embodiment, the processing chip 2 is a FPGA chip.

[0054] In one embodiment, the processing chip 2 is connected to the host computer 1 via a CPU-BUS bus.

[0055] The signal input end of the driving module 3 is connected to the processing chip 2, and the signal output end of the driving module 3 is used to connect to the display module. The driving module 3 includes multiple RSDS differential converters 31, and each RSDS differential converter 31 is connected to the data generation and output module 22 through the signal input end to receive the TTL-RGB signal, the differential clock, the RSDS horizontal signal and the RSDS vertical signal. The RSDS differential converter 31 is also connected to the display module through the signal output end to drive the display module to display the picture through the RSDS differential signal, wherein the RSDS horizontal signal is used to indicate that the TTL-RGB signal displays the picture on the display module along the horizontal direction, and the RSDS vertical signal is used to indicate that the TTL-RGB signal displays the picture on the display module along the vertical direction.

[0056] The host computer 1 also sends the required clock signal CKP corresponding to the external clock according to the software setting to the processing chip 2, and the processing chip 2 generates an RSDS driving signal based on the clock signal CKP.

[0057] The driving module 3 adopts RSDS differential converter 31, cooperates with the differential clock received from the processing chip 2, and drives the TTL-RGB signal to be transmitted to the display module in a differential driving manner, and the display module displays the picture carried by the TTL-RGB signal. In this way, the differential drive of the driving module 3 has a higher noise resistance. When the signal is interfered by external noise, due to the common mode suppression characteristics of the RSDS differential signal, these noises tend to be added to the CKP and CKN of the differential clock at the same time, thereby being offset at the receiving end. More reliable in high-speed, long-distance transmission.

[0058] In one embodiment, the RSDS differential converter 31 uses a chip with model number DS90LV031A.

[0059] In one embodiment, the display module has an RSDS signal interface.

[0060] like Figure 3 As shown, the timing relationship diagram of TTL-RGB signal and RSDS horizontal signal is disclosed. The FPGA chip follows the falling edge of the clock CKP as required to input the clock and valid data, generates a high level from the beginning of counting, maintains a CKP clock cycle pulse width and then converts to a low level, counts 1400 times in one embodiment, and outputs the LP switching signal in this cycle.

[0061] In the same manner as above, an SPOI (SPIO) signal with a delay of 2 clock pulse width is generated in advance of 8 clock signals CKP, and after 1400 counting cycles, the corresponding signal forms an RSDS horizontal signal.

[0062] like Figure 4 As shown, the timing relationship diagram of the TTL-RGB signal and the RSDS vertical signal is disclosed. The GSPOI signal is counted in the vertical mode, and the falling edge of the GCK signal is used as the trigger condition to generate two high levels of the GCK single cycle pulse width, and a low level of the single GCK cycle pulse width is sandwiched in the middle. The GSPOI signal (which can be regarded as a vertical signal) is low at all other times. In one embodiment, it is continuously output with a cycle period of 500 GCK clocks.

[0063] It should be noted that the parameters of each module are different, and the horizontal signal and vertical signal will be different, which are set according to the resolution and leading and trailing edges of each module.

[0064] In this embodiment, a system architecture capable of differentially outputting TTL-RGB signals is constructed by combining a host computer 1, a processing chip 2 and a driving module 3. In particular, an RSDS differential converter 31 is provided in the driving module 3 to perform RSDS differential output of the TTL-RGB signal, thereby meeting the requirements of the RSDS signal interface of the display module.

[0065] In one implementation scenario, such as during a high temperature aging test, the differential output of the RSDS signal avoids signal interference, signal attenuation, and other problems in the transmission line under a high temperature aging environment, greatly improving the stability of the device driving the display module. It can also meet the transmission of high-resolution image data.

[0066] In one embodiment of the present invention, the TTL-RGB signal includes 6 bits of R data representing red information, 6 bits of G data representing green information, and 6 bits of B data representing blue information.

[0067] The 6-bit R data representing red information is: R[0]~R[5]. The 6-bit G data representing green information is: G[0]~G[5]. The 6-bit B data representing blue information is: B[0]~B[5]. Each bit of data is 1 bit.

[0068] The data generation and output module 22 is configured to output two-by-two paired R data, two-by-two paired G data, two-by-two paired B data, and the differential clock in time-division multiplexing.

[0069] The paired R data are R[0] and R[1]; R[2] and R[3]; R[4] and R[5]. The paired G data are G[0] and G[1]; G[2] and G[3]; G[4] and G[5]. The paired B data are B[0] and B[1]; B[2] and B[3]; B[4] and B[5]. The differential clocks are CKP and CKN.

[0070] Time Division Multiplexing (TDM) is a communication technology that achieves the purpose of multi-channel transmission by transmitting different signals in different time periods on the same physical connection. Time division multiplexing uses time as the parameter for signal division transmission, dividing the entire transmission time into non-overlapping time intervals, also known as time slots. These time slots are allocated to each signal source to ensure that each time slot can only be occupied by one signal. In this way, only one signal exists at each brief moment on the circuit, but the overall simultaneous transmission of multiple signals is achieved.

[0071] Taking R[0] and R[1] as an example, in the FPGA chip, the outputs R[0] and R[1] are switched by the rising and falling edges of the clock CKP, so that the two signals are serially output to the DS90LV031A chip, and the signals are converted into RSDS differential signals by the DS90LV031A chip.

[0072] The data generation and output module 22 pairs the TTL-RGB signals and differential clocks in a predetermined order and outputs them in time-division multiplexing.

[0073] The RSDS differential converter 31 is configured to convert the paired signals output by the data generation and output module 22 into RSDS differential signals.

[0074] The RSDS differential converter 31 receives the paired signals from the data generation and output module 22 and outputs them in the form of differential pairs. The RSDS differential converter 31 and the display module communicate using the RSDS protocol, i.e., the RSDS differential converter 31 outputs the paired signals to the display module in the form of RSDS differential signals.

[0075] In one embodiment of the present invention, the RSDS driving signal further includes a test clock, and the test clock is used to instruct the driving module 3 to drive the display module. In this way, the display module can be driven to operate normally and stably by the driving module 3, so that the TTL-RGB signal carrying the picture parameters can be displayed on the display module.

[0076] like Figures 5 to 7 As shown, the timing relationship diagram of each clock in the RSDS drive signal is revealed. Among them, GCK effectively maintains a high level of 42 CKP clock pulse widths at the 1132nd CKP clock falling edge after SPOI, and cyclically outputs the signal at every 1400 CKP clock counts. The REV signal flips its polarity at the 1264th CKP clock cycle after SPOI, and similarly, the COM, CS, and VEE signals flip their polarity and cyclically output at the 1244th CKP clock cycle after SPOI.

[0077] like Figure 8 As shown, in one embodiment of the present invention, the display module driving test device based on RSDS differential signal also includes a Flash memory 4, and the Flash memory 4 is configured to store the picture parameters in the host computer 1, and the processing chip 2 is connected to the Flash memory 4 to obtain the picture parameters.

[0078] The host computer 1 downloads the screen parameters to the Flash memory 4 via USB, and the processing chip 2 obtains the screen parameters from the Flash memory 4 .

[0079] like Fig. 9 As shown, in one embodiment of the present invention, the driving module 3 includes a plurality of, the processing chip 2 includes a multi-channel module 23, the multi-channel module 23 has an input end and a corresponding plurality of output ends, the input end of the multi-channel module 23 receives the RSDS driving signal and the TTL-RGB signal, and the plurality of output ends of the multi-channel module 23 are respectively connected to the signal input ends of the plurality of driving modules 3;

[0080] Each of the driving modules 3 receives the same RSDS driving signal and the TTL-RGB signal, and each of the driving modules 3 is used to connect to one of the display modules.

[0081] In one embodiment, the multi-channel module 23 is a chip of model 74VHC541.

[0082] In this way, a host computer 1 can control multiple driving modules 3 to simultaneously drive multiple display modules for driving testing, thereby greatly improving efficiency.

[0083] like Fig.10 As shown, in one embodiment of the present invention, the display module driving test device based on RSDS differential signal further includes a power module 5 , and the power module 5 is connected to the host computer 1 , the processing chip 2 and the driving module 3 .

[0084] The power supply module 5 is used to provide voltage. The host computer 1 can control the power supply module 5 to output a voltage that meets corresponding operation requirements to the specified driving module 3 and processing chip 2 according to the power supply parameters in the configuration parameters.

[0085] In one embodiment of the present invention, the driving module 3 includes a scaled voltage module 32, the driving module 3 includes a power input terminal and a power output terminal, the input terminal of the scaled voltage module 32 receives voltage through the power input terminal, the scaled voltage module 32 is used to generate a scaled voltage, and the output terminal of the scaled voltage module 32 is connected to the display module through the power output terminal to output the scaled voltage to the display module.

[0086] In one embodiment, the scale voltage module 32 is a scale chip of model LCM6009MT.

[0087] In this way, by generating the scale-tuned voltage through the scale-tuned voltage module 32 , the display module can obtain the required scale-tuned voltage, thereby meeting its power supply demand.

[0088] In one embodiment of the present invention, the driving module 3 includes a backlight control module 33, the driving module 3 includes a power input terminal and a backlight output terminal, the input terminal of the backlight control module 33 receives a voltage through the power input terminal, the backlight control module 33 is used to drive the voltage, the output terminal of the backlight control module 33 is connected to an LED module through the backlight output terminal, and the LED module is arranged in the display module and is used to control the brightness of the display module.

[0089] In one embodiment, the LED module is a matrix-arranged LED lamp, such as 4 columns with 8 LED lamps in each column. The brightness of the LED module can be controlled to be adjustable by the backlight control module 33 .

[0090] In one embodiment, the backlight control module 33 controls the voltage to be adjusted within a range of 20V to 42V.

[0091] In this way, the backlight control module 33 can control the voltage adjustment as needed, thereby adjusting the brightness of the display module to achieve the customer's fixed brightness requirements.

[0092] like Fig.11 As shown, the backlight control module 33 includes a voltage divider circuit 331 and a voltage follower circuit 332, the input end of the voltage divider circuit 331 receives the power supply voltage, the output end of the voltage divider circuit 331 is coupled to the control end of the voltage follower circuit 332, and the voltage divider circuit 331 is configured to output a voltage proportional to the power supply voltage; the input end of the voltage follower circuit 332 is coupled to the negative end of the LED module, and the output end is coupled to the ground end, and the voltage follower circuit 332 is configured to control the brightness of the LED module according to the voltage output by the voltage divider circuit 331.

[0093] In one embodiment, the voltage divider circuit 331 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first diode D1, a second diode D2 and a capacitor C. The first resistor R1, the second resistor R2 and the third resistor R3 are connected in series to the power supply end and the ground end, and the power supply end outputs the supply voltage. Among them, the first resistor R1 is located at the power supply end, the third resistor R3 is located at the ground end, and the second resistor R2 is located between the first resistor R1 and the second resistor R2. The fourth resistor R4, the fifth resistor R5, the first diode D1 and the second diode D2 are connected in series to the power supply end and the ground end, wherein the fourth resistor R4 is located at the power supply end, and the second diode D2 is located at the ground end. In addition, the fourth resistor R4 is connected in parallel with the first resistor R1, the fifth resistor R5 is connected in parallel with the second resistor R2, and the first diode D1 and the second diode D2 are connected in parallel at both ends of the third resistor R3. The current is output from the power supply end and flows to the ground end through the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, the first diode D1 and the second diode D2. The first end of the capacitor C is connected between the fourth resistor R4 and the fifth resistor R5, and also connected between the first resistor R1 and the second resistor R2. The second end of the capacitor C is connected to the ground. The first end of the capacitor C outputs the voltage after dividing the supply voltage and is coupled to the voltage follower circuit 332.

[0094] In one embodiment, the voltage follower circuit 332 includes a plurality of voltage followers, each of which is connected to a group of LED lamps connected in series in the LED module.

[0095] The voltage follower includes an operational amplifier A and a transistor K. The first input terminal of the operational amplifier A receives the voltage after voltage division, the output terminal of the operational amplifier A is connected to the base of the transistor K through the sixth resistor R6, the collector of the transistor K is connected to the negative end of a group of LED lamps connected in series, and the emitter of the transistor K is connected to the ground terminal through the seventh resistor R7 and the eighth resistor R8 arranged in series. The emitter of the transistor K is also connected to the second input terminal of the operational amplifier A.

[0096] In one embodiment, the eighth resistor R8 is a high-precision resistor of 1Ω, and according to I=U / R, a one-to-one ratio display of voltage and current is achieved, which is convenient for using the DC voltage range of a multimeter to test current. It should be noted that a test point is added at one end of the eighth resistor R8 connected to the seventh resistor R7.

[0097] In this way, the positive end of a group of LED lamps connected in series receives a voltage, and the negative end thereof is connected to a voltage follower. The voltage at the negative end of a group of LED lamps connected in series can be set as needed through the control of the transistor K by the operational amplifier A in the voltage follower, thereby controlling the brightness of the group of LED lamps connected in series to be adjustable. When the divided voltage output by the voltage divider circuit 331 remains unchanged, the brightness of the group of LED lamps connected in series is fixed.

[0098] The connection of operational amplifier A forms a follower of input voltage and output voltage, thereby achieving precise control of the conduction of transistor K.

[0099] In one embodiment of the present invention, the processing chip 2 also includes a temporary storage chip for temporarily storing the screen data to be displayed. When display is required, the screen data of the temporary storage chip is read out, processed, and output to the display module by the driving module 3. Thus, the effect of fast output can be achieved, and then the screen data in the Flash memory 4 can be switched with each other. Different screens can be quickly switched on the display module.

[0100] In one embodiment, the temporary storage chip may be a chip with model number XCF01SV020C.

[0101] In summary, the present invention designs a display module drive test device based on RSDS differential signal, which drives the display module through a system device constructed by a host computer 1, a processing chip 2 and a driving module 3. The host computer 1 automatically or manually controls the transmission of the picture to the display module, and the display module displays the picture to test whether the display module is good. In an implementation scenario, the display module is in an old temperature aging environment, and the host computer 1 drives the display module to run and upload the picture by controlling the driving module 3. The display module cyclically displays the picture to detect whether it is good in a high temperature aging environment.

[0102] The present invention is provided with a control signal generating module 21 and a data generating and outputting module 22 in the processing chip 2, generates the required signals and performs pairing in pairs, and provides an RSDS differential converter 31 in the driving module 3, converts the paired signals and processes the output RSDS differential signals, meets the requirements of the RSDS signal interface, and uploads the picture to the display module through the transmission of the RSDS signal. It is possible to realize signal anti-interference and reduce signal attenuation in the transmission line, and greatly improve the stability of the device driving the display module.

[0103] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described systems, systems and modules can refer to the corresponding processes in the aforementioned method implementation methods and will not be repeated here.

[0104] In several embodiments provided in the present application, it should be understood that the disclosed systems, systems and methods can be implemented in other ways. For example, the system implementation described above is only schematic, for example, the division of the modules is only a logical function division, and there may be other division methods in actual implementation, such as multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, systems or modules, which can be electrical, mechanical or other forms. The modules described as separate components may or may not be physically separated, and the components displayed as modules may or may not be physical modules, that is, they may be located in one place, or they may be distributed on multiple network modules. Some or all of the modules can be selected according to actual needs to achieve the purpose of the present implementation scheme.

[0105] In addition, each functional module in each embodiment of the present application can be integrated into a processing module, or each module can exist physically separately, or two or more modules can be integrated into one module. The above-mentioned integrated module can be implemented in the form of hardware or in the form of hardware plus software functional modules. The above-mentioned integrated module implemented in the form of software functional modules can be stored in a computer-readable storage medium. The above-mentioned software functional modules are stored in a storage medium, including a number of instructions for a computer system (which can be a personal computer, a server, or a network system, etc.) or a processor (processor) to perform some steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk.

[0106] Finally, it should be noted that the above implementation modes are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned implementation modes, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned implementation modes, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various implementation modes of the present application.

Claims

1. A display module drive test device based on RSDS differential signal, characterized in that: include: Host computer, edits and stores configuration parameters and screen parameters for testing display modules; A processing chip is communicatively connected with the host computer, the processing chip includes a control signal generating module and a data generating and outputting module, the control signal generating module is used to receive the configuration parameters and generate an RSDS driving signal, the data generating and outputting module is used to receive the picture parameters and generate a TTL-RGB signal, the RSDS driving signal includes a differential clock, an RSDS horizontal signal and an RSDS vertical signal; A driving module, wherein the signal input end of the driving module is connected to the processing chip, and the signal output end of the driving module is used to connect to the display module. The driving module includes multiple RSDS differential converters, each of which is connected to the data generation and output module through the signal input end to receive the TTL-RGB signal, the differential clock, the RSDS horizontal signal and the RSDS vertical signal. The RSDS differential converter is also connected to the display module through the signal output end to drive the display module to display a picture through the RSDS differential signal, wherein the RSDS horizontal signal is used to indicate that the TTL-RGB signal displays a picture on the display module along the horizontal direction, and the RSDS vertical signal is used to indicate that the TTL-RGB signal displays a picture on the display module along the vertical direction.

2. The display module driving test device based on RSDS differential signal according to claim 1, characterized in that: The picture parameters include information of red, green and blue colors; the configuration parameters include power supply parameters, resolution, refresh rate, signal type, vertical signal count times and horizontal signal count times.

3. The display module driving test device based on RSDS differential signal according to claim 1, characterized in that: The TTL-RGB signal includes 6 bits of R data representing red information, 6 bits of G data representing green information, and 6 bits of B data representing blue information; The data generation and output module is configured to output two-by-two paired R data, two-by-two paired G data, two-by-two paired B data, and the differential clock in time-division multiplexing; The RSDS differential converter is configured to convert the paired signals output by the data generation and output module into RSDS differential signals.

4. The display module driving test device based on RSDS differential signal according to claim 1, characterized in that: The RSDS driving signal further includes a test clock, and the test clock is used to instruct the driving module to drive the display module.

5. The display module driving test device based on RSDS differential signal according to claim 1, characterized in that: It also includes a Flash memory, which is configured to store the picture parameters in the host computer, and the processing chip is connected to the Flash memory to obtain the picture parameters.

6. The display module driving test device based on RSDS differential signal according to claim 1, characterized in that: The driving module includes a plurality of modules, the processing chip includes a multi-channel module, the multi-channel module has an input end and a plurality of corresponding output ends, the input end of the multi-channel module receives the RSDS driving signal and the TTL-RGB signal, and the plurality of output ends of the multi-channel module are respectively connected to the signal input ends of the plurality of driving modules; Each of the driving modules receives the same RSDS driving signal and the TTL-RGB signal, and each of the driving modules is used to connect to one of the display modules.

7. The display module driving test device based on RSDS differential signal according to claim 1, characterized in that: It also includes a power module, which is connected to the host computer, the processing chip and the drive module.

8. The display module driving test device based on RSDS differential signal according to claim 7, characterized in that: The driving module includes a scaled voltage module, which includes a power input terminal and a power output terminal. The input terminal of the scaled voltage module receives voltage through the power input terminal, and the scaled voltage module is used to generate a scaled voltage. The output terminal of the scaled voltage module is connected to the display module through the power output terminal to output the scaled voltage to the display module.

9. The display module driving test device based on RSDS differential signal according to claim 1, characterized in that: The driving module includes a backlight control module, which includes a power input terminal and a backlight output terminal. The input terminal of the backlight control module receives voltage through the power input terminal, and the backlight control module is used for driving voltage. The output terminal of the backlight control module is connected to an LED module through the backlight output terminal. The LED module is arranged in the display module and is used to control the brightness of the display module.

10. The display module driving test device based on RSDS differential signal according to claim 9, characterized in that: The backlight control module includes a voltage divider circuit and a voltage follower circuit, the input end of the voltage divider circuit receives the power supply voltage, the output end of the voltage divider circuit is coupled to the control end of the voltage follower circuit, and the voltage divider circuit is configured to output a voltage proportional to the power supply voltage; the input end of the voltage follower circuit is coupled to the negative end of the LED module, and the output end is coupled to the ground end, and the voltage follower circuit is configured to control the brightness of the LED module according to the voltage output by the voltage divider circuit.

Images