Display driving circuit of display panel, display device and display driving method

Abstract

The invention provides a display driving circuit of a display panel, a display device and a display driving method. Compared with the existing scheme that the balance gear cannot be adjusted after being set in the use process of the product, the eye pattern measurement module is designed in the data driving chip, the eye pattern data can be measured through the eye pattern measurement module in the use process after the product leaves the factory, the measured eye pattern data is compared with the eye pattern template, and the adjustment precision is improved. And the comparison result is fed back to the time sequence control chip and / or the data processing module to compensate the data driving signal, so that the quality of the eye pattern is improved, the signal transmission quality is ensured, and the product display effect is finally improved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display driving circuit, a display device and a display driving method of a display panel. Background Art

[0002] With the development of display technology, larger display products can bring better user experience. However, as the product size increases, the data transmission volume and transmission rate increase exponentially, and the power consumption of the product also increases synchronously. Therefore, for large-size, high-transmission-rate, and high-data-transmission display products, the quality of the eye diagram directly determines the quality of data transmission and thus affects the display effect of the product. Ensuring the eye diagram and picture quality of such products is the key. Summary of the invention

[0003] The main technical problem solved by the present application is to provide a display driving circuit, a display device and a display driving method for a display panel, so as to solve the problem of how to improve the eye diagram quality of display products in the prior art.

[0004] In order to solve the above technical problems, the first technical solution provided by the present application is: to provide a display driving circuit of a display panel, which includes: Timing control chip; The data driving chip includes a data processing module, which is used to receive the data driving signal output by the timing control chip, process and generate display data, and transmit it to the display panel; Among them, the data driving chip also includes an eye diagram measurement module; the eye diagram measurement module is used to generate eye diagram data from display data, compare the eye diagram data with an eye diagram template, and feed back to the timing control chip and / or the data processing module.

[0005] in, The eye diagram measurement module feeds back to the timing control chip; The eye diagram measurement module specifically includes: if the eye diagram data is less than or equal to the threshold range set by the eye diagram template, outputting a first signal to the timing control chip; The timing control chip adjusts the swing level of the data driving signal according to the first signal; or, the timing control chip adjusts the balance level of the data driving signal according to the voltage value of the first signal.

[0006] in, The eye diagram measurement module feeds back to the data processing module; the eye diagram measurement module specifically includes: If the eye diagram data is less than or equal to the threshold range set by the eye diagram template, output a second signal to the data processing module; The data processing module determines the balance gear of the data driving signal according to the voltage value of the second signal.

[0007] The eye diagram measurement module is preferentially fed back to the timing control chip, and if the eye diagram data is less than or equal to the threshold range set by the eye diagram template, the eye diagram measurement module outputs a first signal to the timing control chip; If the eye diagram data regenerated after the swing level of the data driving signal is adjusted to the maximum is less than or equal to the threshold range set by the eye diagram template, the timing control chip latches the current swing level; After the timing control chip latches the current swing gear, the eye diagram measurement module outputs a second signal to the data processing module, and the data processing module determines the balance gear of the data driving chip according to the voltage value of the second signal.

[0008] in, After the data processing module determines the balancing gear of the data driving chip according to the voltage value of the second signal, the eye diagram measurement module further includes: If the difference between the eye height of the eye diagram data and the eye height threshold set by the eye diagram template is greater than or equal to zero and less than a preset value, the level information is fed back to the data processing module; The data processing module latches the current balancing gear.

[0009] in, After the data processing module latches the current equalization gear, the eye diagram measurement module also includes: If the eye height of the eye diagram data is greater than or equal to the preset eye height value, the eye diagram measurement module outputs a first signal to the timing control chip; The timing control chip adjusts the swing level of the data driving signal according to the first signal.

[0010] Among them, the timing control chip is also used to confirm the use time of the display panel; the display driving circuit also includes an on-chip system, and the on-chip system controls the opening time of the eye diagram measurement module according to the use time of the display panel.

[0011] Among them, the eye diagram measurement module includes a data acquisition module, an amplifier / attenuator, a phase-locked loop, a data clock recovery module, a trigger module and an eye diagram judgment module which are connected in sequence; the data acquisition module is used to collect the display data output by the data processing module; the display data is processed and output by the amplifier / attenuator, the phase-locked loop, the data clock recovery module and the trigger module in sequence, and is re-superimposed to generate eye diagram data; the eye diagram judgment module compares the eye diagram data with the eye diagram template, and feeds back the comparison result to the timing control chip and / or the data processing module.

[0012] In order to solve the above technical problem, the second technical solution provided in the present application is: to provide a display device, which includes a display panel and the above display driving circuit.

[0013] In order to solve the above technical problems, the third technical solution provided by the present application is: to provide a display driving method, using the above display driving circuit, which includes: Generate eye diagram data; The eye diagram data is compared with the eye diagram template and fed back to the timing control chip and / or the data processing module.

[0014] Beneficial effects of the present application: Different from the prior art, the present application provides a display driving circuit, a display device and a display driving method for a display panel, wherein the display driving circuit of the display panel includes a timing control chip and a data driving chip. The data driving chip includes a data processing module, which is used to receive the data driving signal output by the timing control chip, and process and generate display data, and transmit it to the display panel. Among them, the data driving chip also includes an eye diagram measurement module. The eye diagram measurement module is used to generate eye diagram data from the display data, and compare the eye diagram data with the eye diagram template, and feed it back to the timing control chip and / or the data processing module. Compared with the current solution that the equalization gear cannot be adjusted after the product is set during use, the present application designs the eye diagram measurement module into the data driving chip, and can measure the eye diagram data through the eye diagram measurement module during the use of the product after leaving the factory, and compare the measured eye diagram data with the eye diagram template, and feed back to the timing control chip and / or the data processing module according to the comparison result, so as to compensate the data driving signal, thereby improving the quality of the eye diagram, ensuring the signal transmission quality, and finally improving the product display effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technical workers in this field, other drawings can be obtained based on these drawings without any creative work.

[0016] Figure 1 It is a schematic diagram of the eye diagram provided by this application; Figure 2 It is a schematic diagram of combining different signal bit transitions provided by the present application into an eye diagram; Figure 3 It is a schematic diagram of eye diagram simulation data analysis provided by this application; Figure 4 is a comparative schematic diagram of different eye diagrams provided in this application; Figure 5 It is a schematic diagram of a data transmission architecture without equalization compensation provided by the present application; Figure 6 This is a schematic diagram of the eye diagram before the balanced gear compensation provided by the present application; Figure 7 It is a schematic diagram of a data transmission architecture with balanced compensation provided by the present application; Figure 8 This is a schematic diagram of the eye diagram after balanced gear compensation provided by the present application; Fig. 9 is a module schematic diagram of a first embodiment of a display driving circuit provided by the present application; Fig.10 is a schematic diagram of a data transmission architecture of a first embodiment of a display driving circuit provided by the present application; Fig.11 It is a schematic diagram of the module structure of an embodiment of an eye diagram measurement module provided by the present application; Fig.12 It is a schematic diagram of eye diagram template setting provided by this application; Fig.13 It is a schematic diagram of the eye diagram data exceeding the specification provided by this application; Fig.14 is a module schematic diagram of a second embodiment of a display driving circuit provided by the present application; Fig.15 is a schematic diagram of a data transmission architecture of a second embodiment of a display driving circuit provided by the present application; Fig.16 is a module schematic diagram of a third embodiment of a display driving circuit provided by the present application; Fig.17 is a schematic diagram of a data transmission architecture of a third embodiment of a display driving circuit provided by the present application; Fig.18 It is a schematic diagram of the eye diagram measurement process provided by this application; Fig.19 is a structural schematic diagram of an embodiment of a display device provided by the present application; Fig. 20 It is a flow chart of an implementation of a display driving method provided in the present application.

[0017] Description of Figure Numbers: TX, transmitter; PLL, phase-locked loop; Ser, serializer; Des, deserializer; RX, receiver; CDR, data clock recovery module; Ref clk, transmit clock; Buffer, buffer; TCON, timing controller / timing control chip; Driver, driver; EQ, equalizer gear. DETAILED DESCRIPTION

[0018] The scheme of the embodiment of the present application is described in detail below in conjunction with the drawings of the specification.

[0019] In the following description, for the purpose of explanation rather than limitation, specific details such as specific system structures, interfaces, and technologies are provided to facilitate a thorough understanding of the present application.

[0020] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technical workers in the field without making creative work are within the scope of protection of this application.

[0021] The terms "first", "second" and "third" in this application are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first", "second" and "third" can explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. All directional indications (such as up, down, left, right, front, back...) in the embodiments of this application are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices.

[0022] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0023] See also Figures 1 to 4 , Figure 1 is an eye diagram provided by this application, Figure 2 is a schematic diagram of combining different signal bit transitions provided by the present application into an eye diagram, Figure 3 is a schematic diagram of eye diagram simulation data analysis provided by this application, Figure 4 is a schematic diagram comparing different eye diagrams provided in this application, wherein: Figure 4 (a) in the middle represents an excellent eye diagram, with the eyes open and data read normally. Figure 4 (b) shows a good eye diagram. The eye is half open and the data is distorted, but the driver can recognize it and output it normally. Figure 4Middle (c) represents a poor eye diagram, where the eyes are closed and the data is distorted and cannot be recognized normally.

[0024] In the existing product series, the larger the size of the display product, the more data needs to be transmitted, and the faster the transmission rate per unit time. Take the 55-inch UHD 60Hz product as an example. The full name of UHD is Ultra High Definition. The required transmission rate = (4400*2250*3*8*60 / 12)*9 / 8=1.3Gbp / s; the quality of such high-speed transmission signals is usually measured by eye diagrams. Figure 1 and Figure 2 As shown in the figure, the so-called eye diagram is actually a statistical distribution diagram formed naturally by superimposing the data bits at different positions of the high-speed digital signal at time intervals. It can reflect the overall characteristics of all digital signals on the entire data signal transmission link; on the other hand, all the data of the eye diagram can also be measured by superimposing as many waveform data as possible to analyze the signal quality. The eye diagram can also be said to be a series of different binary codes of the digital signal superimposed according to a certain rule.

[0025] The impact of eye diagram on display effect: During signal transmission, when the rate increases to a certain level, there will inevitably be loss in the signal from sending to receiving. In order to analyze the quality of the signal, such as Figure 3 and Figure 4 As shown, the eye diagram can reflect the quality of the signal. A poor eye diagram shows that the signal may have problems such as inter-code crosstalk, voltage noise, non-compliant duty cycle, signal jitter, etc. The eye diagram itself will not affect the display effect, but the data problems shown by the eye diagram will cause various problems such as noise, screen flickering, ripples, and inaccurate grayscale.

[0026] See also Figures 1 to 8 , Figure 5 is a schematic diagram of a data transmission architecture without equalization compensation provided by this application, Figure 6 is a schematic diagram of an eye diagram before the equalization gear compensation provided by the present application, Figure 7 is a schematic diagram of a data transmission architecture with balanced compensation provided by this application, Figure 8 This is a schematic diagram of the eye diagram after balanced gear compensation provided by the present application.

[0027] In the existing eye diagram adjustment technology, first, it can be controlled by adjusting the data transmission energy output by the TCON (Timing Controller). For example, if the TCON outputs a large data thrust, the eye diagram swing will naturally be high. Second, the eye diagram can be adjusted by setting the EQ (Equalization) compensation gear.

[0028] like Figure 5 As shown, in the existing data transmission process, the parallel transmission data enters the serializer Ser of TCON. Under the synchronization of the stable transmission clock Rer clk generated by the phase-locked loop PLL, the serializer Ser converts the parallel data into a serial differential signal and sends it to the transmission channel through the transmitter TX. The differential signal reaches the receiver RX of the Driver, and the clock data recovery module recovers the receiving clock from the distorted receiving signal. The clock is used by the deserializer Des to sample the serial data, restore it to parallel data, and transmit it to the display panel.

[0029] like Figure 7 As shown in the figure, when there is a problem with the eye diagram, the existing solution is to use equalization counting to compensate for the loss at high speed, that is, EQ compensation. EQ compensation means that the signal passing through the transmission channel is compensated to correct the errors caused by noise and interference, so that the eye diagram can be reopened. When the signal is distorted (the eye diagram is not open), EQ can still distinguish the original signal and reproduce the eye diagram trajectory by correcting the voltage level of the high-frequency component; at the same time, EQ compensation will compensate for the loss of the transmission signal by raising the energy of the high-frequency component in the transmitted signal (pre-emphasis method), or reduce the low-frequency energy to reduce the increased signal part caused by interference during the transmission process (de-emphasis method).

[0030] The defects of the existing solution: Although EQ can compensate the eye diagram, the existing EQ compensation method generally uses an external resistor to set the voltage level of the EQ1\2 signal input to the Driver to confirm that the EQ compensation level is 0dB (no compensation), 3dB, 6dB, 9dB. After the EQ compensation level is set, it is output through the buffer. The buffer is used to temporarily store data for transmission or processing between different devices, modules or systems. Users cannot change the EQ level during use, but during the operation of the product, due to various factors such as the operating environment, line impedance, aging, electromagnetic interference, etc., after a period of operation, the actual required EQ compensation effect will not match the setting, resulting in an eye diagram NG (No Good, unqualified) display abnormality.

[0031] like Figure 6 and Figure 8 As shown in the figure, due to the results of EQ, the final eye diagram needs to be obtained through simulation. That is to say, at present, we can only measure the eye diagram before EQ, and whether the set EQ gear is appropriate, the driver manufacturer needs to use the eye diagram data before EQ to simulate through an oscilloscope to obtain the eye diagram after EQ. However, due to factors such as loss and impedance in data transmission, there is always a difference between the eye diagram after EQ and the simulated eye diagram.

[0032] See also Figures 1 to 11 , Fig. 9 is a module schematic diagram of a first embodiment of a display driving circuit provided by the present application, Fig.10 is a schematic diagram of a data transmission architecture of a first embodiment of a display driving circuit provided by the present application, Fig.11 It is a schematic diagram of the module structure of an embodiment of an eye diagram measurement module provided by the present application.

[0033] Based on the above technical problems, the present application provides a display driving circuit of a display panel. The display driving circuit of the display panel includes a timing control chip and a data driving chip. The data driving chip includes a data processing module, which is used to receive the data driving signal output by the timing control chip, and process and generate display data, and transmit it to the display panel. Among them, the data driving chip also includes an eye diagram measurement module. The eye diagram measurement module is used to generate eye diagram data from display data, and compare the eye diagram data with the eye diagram template, and feed it back to the timing control chip and / or the data processing module.

[0034] Compared with the current solution in which the equalization gear cannot be adjusted after it is set during use, the present application designs an eye diagram measurement module into the data driver chip. The eye diagram data can be measured through the eye diagram measurement module during the use of the product after leaving the factory, and the measured eye diagram data can be compared with the eye diagram template. The comparison result is fed back to the timing control chip and / or the data processing module to compensate for the data drive signal, thereby improving the quality of the eye diagram, ensuring the signal transmission quality, and ultimately improving the product display effect.

[0035] In some embodiments, the display driving circuit of the display panel further includes a transmission channel, which is connected between the timing control chip and the data driving chip and is used to transmit differential signals.

[0036] The transmission channel consists of a pair of signals with opposite polarities. Differential signals have a strong ability to suppress common-mode interference and can maintain signal integrity during long-distance transmission. However, in actual transmission, they will be affected by crosstalk, resulting in data distortion.

[0037] The timing control chip transmits the data driving signal to the data driving chip via the transmission channel. The data driving chip processes the data driving signal, converts it into display data, and transmits it to the display panel to drive the display panel to display.

[0038] The timing control chip refers to TCON (Timing Controller), which is mainly used to manage the driving timing of the display panel, process and distribute pixel data, and optimize the display effect.

[0039] In some embodiments, the timing control chip includes a serializer Ser, a phase-locked loop PLL and a transmitter TX.

[0040] The serializer Ser converts parallel transmission data into serial data. Parallel data transmission transmits data on multiple lines at the same time, but the cost is high and it is susceptible to interference when transmitting over long distances. The serializer Ser can convert it into serial data that is transmitted sequentially on a single line, improving transmission efficiency and anti-interference capabilities.

[0041] The phase-locked loop (PLL) generates a stable transmit clock Rer clk based on the reference clock. In data transmission, an accurate and stable clock is crucial. It is used to synchronize the data transmission rhythm and ensure that the data can be sampled and transmitted correctly.

[0042] The transmitter TX is used to send transmit data to the transmission channel.

[0043] Specifically, parallel transmission data enters the serializer Ser, and under the synchronization of the stable transmission clock Rerclk generated by the phase-locked loop PLL, the serializer Ser converts the parallel data into a serial differential signal, and sends it to the transmission channel through the transmitter TX.

[0044] In other embodiments, the timing control chip may further include more structures, such as latches, etc., which are not restricted here and are selected according to actual needs.

[0045] In some embodiments, the data processing module includes a receiver RX, a data clock recovery module CDR and a deserializer Des.

[0046] The receiver RX is used to receive data from the transmission channel.

[0047] Since the clock and data signals may change during the transmission process, the data clock recovery module CDR recovers the accurate receiving clock from the received serial data and provides a synchronous clock for subsequent data deserialization.

[0048] The deserializer Des uses the recovered clock signal to restore the received serial data into parallel received data.

[0049] Specifically, the differential signal arrives at the receiver RX, and the clock data recovery module recovers the receiving clock from the distorted receiving signal. The clock is used by the deserializer Des to sample the serial data and restore it to parallel data.

[0050] In other embodiments, the data processing module may further include more structures, such as latches, etc., which are not restricted here and are selected according to actual needs.

[0051] The input end of the eye diagram measurement module is connected between the data driving chip and the display panel to access the display data transmitted to the display panel.

[0052] The output end of the eye diagram measurement module is connected to the timing control chip to feed back the level signal to the timing control chip, and / or the output end of the eye diagram measurement module is connected to the data processing module to feed back the level signal to the data processing module.

[0053] In some embodiments, Fig.11 As shown, the eye diagram measurement module includes a data acquisition module, an amplifier / attenuator, a phase-locked loop PLL, a data clock recovery module CDR, a trigger module and an eye diagram determination module connected in sequence. The data acquisition module is used to collect the display data output by the data processing module. The display data is processed and output by the amplifier / attenuator, the phase-locked loop PLL, the data clock recovery module CDR and the trigger module in sequence, and is re-superimposed to generate eye diagram data. The eye diagram determination module compares the eye diagram data with the eye diagram template, and feeds back the comparison result to the timing control chip and / or the data processing module.

[0054] In the present application, in the process of transmitting display data to the display panel by the data processing module, the display data is returned to the inside of the data driver chip again through the feedback routing, and the display data fed back is collected by the data acquisition module, and then the display data is processed by the amplifier / attenuator for subsequent module collection, and then the signal output from the phase-locked loop PLL module is maintained at a certain phase relationship with the input signal frequency, and the noise interference is removed at the same time, and then the clock is recovered by the data clock recovery module CDR. Due to the data transmission protocol, the clock and data are embedded together. In order to measure the eye diagram, the fused data and clock need to be separated, and the clock is obtained from the signal again to confirm the data transmission position to generate the eye diagram. Finally, the processed data is output through the trigger module and re-superimposed to form the eye diagram data. The eye diagram data is compared by the eye diagram determination module, and the level signal is fed back to the timing control chip and / or the data processing module according to the comparison result.

[0055] See also Figures 1 to 13 , Fig.12 This is a schematic diagram of eye diagram template setting provided by this application. Fig.13 This is a schematic diagram of the eye diagram data exceeding the specification provided by this application.

[0056] In some embodiments, the eye diagram measurement module feeds back to the timing control chip. The eye diagram measurement module specifically includes: if the eye diagram data is less than or equal to the threshold range set by the eye diagram template, outputting a first signal to the timing control chip. The timing control chip adjusts the swing gear of the data drive signal according to the first signal.

[0057] The figure of the threshold range defined by the eye diagram template can generally be a quadrilateral or hexagonal shape, etc., and the specific shape depends on the specific interface protocol and rate requirements. The embodiment of the present application is described by taking the threshold range defined by the eye diagram template as a hexagon as an example.

[0058] Exemplarily, the threshold range defined by the eye diagram template is a hexagonal area surrounded by six endpoints ABCDEF, wherein the direction of the line between endpoint B and endpoint F represents the eye height direction of the eye diagram, and the direction of the line between endpoint A and endpoint D represents the eye width direction of the eye diagram.

[0059] The eye diagram data is equal to the threshold range set by the eye diagram template, that is, the eye diagram data touches the boundary of the hexagonal area surrounded by the six endpoints ABCDEF. It can be understood that the coordinates of the eye diagram data are located on the boundary line of the hexagonal area surrounded by the six endpoints ABCDEF.

[0060] The eye diagram data is smaller than the threshold range set by the eye diagram template, that is, the eye diagram data is located in the hexagonal area surrounded by the six endpoints ABCDEF. It can be understood that the coordinates of the eye diagram data are located in the hexagonal area surrounded by the six endpoints ABCDEF.

[0061] If it is detected that the eye diagram data is less than or equal to the threshold range set by the eye diagram template, it means that the current display data signal is distorted and there may be a risk of abnormal display. At this time, the eye diagram measurement module will output a first signal.

[0062] After receiving the first signal, the timing control chip will adjust the swing level of the data drive signal. The swing level refers to the range of change of the signal voltage, which reflects the strength and dynamic range of the signal. By adjusting the swing level, the strength of the data drive signal can be changed. When the signal quality is poor, appropriately increasing the swing level can make the signal more resistant to interference during transmission, thereby improving the signal quality; conversely, if the signal quality is too strong, reducing the swing level can avoid signal distortion or interference with other circuits.

[0063] Exemplarily, the timing control chip can increase the swing amplitude level step by step according to the first signal. For example, the timing control chip increases or decreases the swing amplitude level by one level each time it receives the first signal. The timing control chip can also adjust the swing amplitude level by jumping the level according to the first signal, for example, the timing control chip increases or decreases the swing amplitude level by two levels each time it receives the first signal.

[0064] Exemplarily, in the product design simulation stage, the swing gear of the default data drive signal is the smallest. The display data output by the data driver chip is regenerated into eye diagram data through the eye diagram measurement module, and the eye diagram data is compared with the threshold range set by the eye diagram template. If the eye diagram data is less than or equal to the threshold range set by the eye diagram template, it means that the eye diagram is not compliant. At this time, the first signal fed back by the eye diagram measurement module to the timing control chip is a low level. The timing control chip receives the first signal of the low level, increases the swing gear of the data drive signal, and retransmits it to the data processing module to generate new display data. Repeat the above steps, feed back the display data to the eye diagram measurement module again to regenerate the eye diagram data, and compare it with the eye diagram template until the eye diagram data is greater than the threshold range set by the eye diagram template, the eye diagram measurement module feeds back the first signal of the high level signal to the timing control chip, the timing control chip transmits the data drive signal of the current swing gear to the data driver chip, the data driver chip processes and generates the display data and transmits it to the display panel to drive the display panel to display normally, so as to improve the quality of the eye diagram and ensure the quality of signal transmission, and finally improve the display effect of the product.

[0065] also, Fig.12 The area above the line connecting the middle endpoints G and H represents the upper forbidden area, and the area below the line connecting the endpoints I and J represents the lower forbidden area. It can be understood that the area below the line connecting the endpoints G and H and the area above the line connecting the endpoints I and J represent the maximum restricted range. That is, the area between the upper forbidden area and the lower forbidden area represents the maximum restricted range.

[0066] Normal eye diagram data should be within the maximum limit range and outside the threshold range defined by the eye diagram template.

[0067] Specifically, Fig.13 As shown in the figure, the red hexagonal area represents the threshold range set by the eye diagram template, the red rectangular area located in the red hexagonal area represents the upper prohibited area, and the red rectangular area located in the red hexagonal area represents the lower prohibited area. The blue figure represents the eye diagram. Fig.13 The blue part of the graph enters the lower prohibited area (the green circle), that is, although the blue graph is outside the threshold range defined by the eye diagram template, it is also outside the maximum limit range, indicating that the eye diagram data is not compliant.

[0068] In this embodiment, the swing gear is adjusted by the timing control chip during the use of the product after leaving the factory. By increasing the voltage swing of the signal, the signal-to-noise ratio (SNR) of the receiving end can be improved, thereby improving the opening degree of the eye diagram and achieving the purpose of improving the eye diagram quality. Secondly, improving the eye diagram quality by adjusting the swing gear alone can reduce system power consumption and control complexity compared to adjusting the balance gear.

[0069] In some embodiments, the eye diagram measurement module feeds back to the timing control chip. The eye diagram measurement module specifically includes: if the eye diagram data is less than or equal to the threshold range set by the eye diagram template, outputting a first signal to the timing control chip. The timing control chip adjusts the balance gear of the data drive signal according to the voltage value of the first signal.

[0070] The balancing gear and the voltage value have a mapping relationship to form a mapping table. For example, the balancing gear can be set to 0dB (no compensation), 3dB, 6dB, 9dB and other gears.

[0071] Different gears correspond to different voltage values. The voltage value here can be a range value or a fixed value. If there are many equalization gears, one gear can correspond to one voltage value. For example, the equalization gear can be set to 0dB (no compensation), 1dB, 2dB, 3dB, 4dB, 6dB, 7dB, 8dB, 9dB and other gears. If there are fewer equalization gears, one gear can correspond to a voltage range value. The equalization gear can be set to 0dB (no compensation), 4dB, 8dB, 12dB and other gears. There is no restriction here. Choose according to actual needs.

[0072] Specifically, if the eye diagram data is less than or equal to the threshold range set by the eye diagram template, it means that the eye diagram is not compliant. At this time, the eye diagram measurement module feeds back the first signal to the timing control chip. The timing control chip determines the current balance gear of the data drive signal according to the mapping relationship between the voltage value of the first signal and the balance gear, and sends a control signal to the data processing module. The data processing module adjusts the frequency domain characteristics of the data drive signal according to the received balance gear information, and regenerates the display data to transmit to the display panel, so as to improve the quality of the eye diagram and ensure the quality of signal transmission, and finally improve the product display effect.

[0073] The data driving signal includes but is not limited to enhancing high frequency components to compensate for channel loss or modifying phase characteristics to reduce inter-symbol interference (ISI).

[0074] In this embodiment, during the use of the product after leaving the factory, the equalization gear is adjusted by the timing control chip to improve the eye diagram quality.

[0075] See also Figures 1 to 15 , Fig.14 is a module schematic diagram of a second embodiment of a display driving circuit provided by the present application, Fig.15 It is a schematic diagram of the data transmission architecture of the second embodiment of the display driving circuit provided by the present application.

[0076] In some embodiments, the eye diagram measurement module feeds back to the data processing module. The eye diagram measurement module specifically includes: if the eye diagram data is less than or equal to the threshold range set by the eye diagram template, outputting a second signal to the data processing module. The data processing module determines the balance gear of the data drive signal according to the voltage value of the second signal.

[0077] Specifically, if the eye diagram data is less than or equal to the threshold range set by the eye diagram template, it means that the eye diagram is not compliant. At this time, the eye diagram measurement module feeds back the second signal to the data processing module. The data processing module determines the balance gear of the data drive signal according to the mapping relationship between the voltage value of the second signal and the balance gear, and adjusts the frequency domain characteristics of the data drive signal according to the balance gear, and regenerates the display data to transmit to the display panel, so as to improve the quality of the eye diagram, ensure the quality of signal transmission, and finally improve the product display effect.

[0078] In this embodiment, during the use of the product after leaving the factory, the data driver chip is used to adjust the equalization gear, improve the rise time and fall time of the signal, reduce inter-symbol interference, and thus improve the quality of the eye diagram.

[0079] See also Figures 1 to 17 , Fig.16 is a module schematic diagram of a third embodiment of a display driving circuit provided by the present application, Fig.17 2 is a schematic diagram of a data transmission architecture of a third embodiment of a display driving circuit provided in the present application.

[0080] In some embodiments, the eye diagram measurement module is preferentially fed back to the timing control chip. If the eye diagram data is less than the threshold range set by the eye diagram template, the eye diagram measurement module outputs a first signal to the timing control chip. If the eye diagram data regenerated after the swing gear of the data drive signal is adjusted to the maximum is less than or equal to the threshold range set by the eye diagram template, the timing control chip latches the current swing gear. After the timing control chip latches the current swing gear, the eye diagram measurement module outputs a second signal to the data processing module, and the data processing module determines the balance gear of the data drive chip according to the voltage value of the second signal.

[0081] Exemplarily, during the product design simulation stage, the default swing level of the data drive signal is the smallest. If the eye diagram data regenerated after the swing level of the data drive signal is adjusted to the maximum is less than or equal to the threshold range set by the eye diagram template, it means that the problem of non-compliance of the eye diagram cannot be completely solved by adjusting the swing level of the data drive signal alone. At this time, the first signal received by the timing control chip is a low level, and the current maximum swing level is latched. After the timing control chip latches the current maximum swing level, the eye diagram measurement module feeds back the second signal to the data processing module. The data processing module determines the balance level of the data drive signal based on the mapping relationship between the voltage value of the second signal and the balance level, and regenerates the display data and transmits it to the display panel, so as to improve the quality of the eye diagram and ensure the quality of signal transmission, and finally improve the product display effect.

[0082] In this embodiment, during the use of the product after leaving the factory, the swing gear is first adjusted by the timing control chip, and then the equalization gear is adjusted by the data driver chip to improve the eye diagram quality. Compared with the solution of adjusting the equalization gear alone, this embodiment can further improve the control accuracy of the eye diagram quality. For example, adjusting the swing gear first can ensure that the signal has sufficient amplitude, providing a better basis for subsequent equalization adjustment; secondly, it can also avoid over-reliance on equalization adjustment to improve the eye diagram quality. For example, if the eye diagram can be made compliant only by adjusting the swing gear, there is no need to enter the more complex equalization gear adjustment stage, thereby reducing system power consumption and control complexity.

[0083] In other embodiments, after the timing control chip latches the current maximum swing gear, the eye diagram measurement module can also feed back level information to the timing control chip, determine the balance gear of the data drive signal through the timing control chip, and regenerate the display data to transmit to the display panel, so as to improve the quality of the eye diagram, ensure the quality of signal transmission, and ultimately improve the display effect of the product. That is, the swing gear and the balance gear are adjusted through the timing control chip.

[0084] In some embodiments, after the data processing module determines the balancing gear of the data driving chip according to the voltage value of the second signal, the eye diagram measurement module further includes: if the difference between the eye height of the eye diagram data and the eye height threshold set by the eye diagram template is greater than or equal to zero and less than a preset value, feedback level information to the data processing module. The data processing module latches the current balancing gear.

[0085] Specifically, during the use of the product after leaving the factory, the swing gear is first adjusted by the timing control chip, and then the balancing gear is adjusted by the data driver chip, that is, the data processing module determines the balancing gear of the data driver chip according to the voltage value of the second signal. If the difference between the eye height of the eye diagram data and the eye height threshold set by the eye diagram template is greater than or equal to zero, and less than a preset value, it means that the display data generated after adjusting the balancing gear, and the eye diagram data regenerated by the eye diagram measurement module meets the threshold range set by the eye diagram template.

[0086] Exemplarily, the preset value is 50 mV. In other implementations, the preset value may be other values.

[0087] The eye height threshold of the eye diagram template indicates the minimum voltage range that the signal must reach. The eye height of the eye diagram data is the actual measured signal voltage range, usually expressed as the difference between the maximum voltage and the minimum voltage.

[0088] The difference between the eye height of the eye diagram data and the eye height threshold set by the eye diagram template is greater than or equal to zero, indicating that the eye height of the eye diagram data at least meets the requirement of the eye diagram template.

[0089] The difference between the eye height of the eye diagram data and the eye height threshold set by the eye diagram template is less than a preset value, indicating that although the eye height of the eye diagram data meets the requirements of the eye diagram template, it does not significantly exceed the requirements of the eye diagram template.

[0090] In some embodiments, after the data processing module latches the current balancing gear, the eye diagram measurement module further comprises: if the eye height of the eye diagram data is greater than or equal to the preset eye height value, the eye diagram measurement module outputs a first signal to the clock control chip. The timing control chip adjusts the swing gear of the data driving signal according to the first signal.

[0091] Exemplarily, the eye height preset value is 500 mv. In other implementations, the eye height preset value may be other values.

[0092] When the eye height of the eye diagram data is greater than or equal to the preset eye height value, it means that the eye diagram has entered the upper prohibited area or the lower prohibited area, and the eye diagram is not compliant.

[0093] During the use of the product after it leaves the factory, the swing gear is first adjusted through the timing control chip, and then the equalization gear is adjusted through the data driver chip. After the eye diagram data meets the threshold range greater than the eye diagram template setting and the current equalization gear is latched, the eye diagram measurement module determines the eye height of the eye diagram data again. If the eye height of the eye diagram data is greater than or equal to the eye height preset value, the first signal of the low level is fed back to the timing control chip. Since the previously latched swing gear is the largest, the timing control chip reduces the swing gear according to the first signal and retransmits it to the data processing module to generate new display data. Repeat the above steps, and feed back the display data to the eye diagram measurement module again to regenerate the eye diagram data, and compare it with the eye diagram template until the eye height of the eye diagram data is less than the eye height preset value. The eye diagram measurement module feeds back the first signal of the high level signal to the timing control chip, and the timing control chip transmits the data drive signal of the current swing gear to the data driver chip. The data driver chip processes and generates the display data and transmits it to the display panel to drive the display panel to display normally, so as to improve the quality of the eye diagram and ensure the signal transmission quality, and finally improve the product display effect.

[0094] In this embodiment, during the use of the product after leaving the factory, the swing gear is adjusted first, then the balance gear is adjusted, and finally the swing gear is adjusted again, so that the eye diagram data satisfies the maximum limit range and is outside the threshold range defined by the eye diagram template, further improving the eye diagram quality. Compared with the solution of adjusting the balance gear alone, this embodiment can further improve the control accuracy of the eye diagram quality and avoid excessive swing of the data drive signal to increase power consumption.

[0095] In some embodiments, the timing control chip is also used to confirm the usage time of the display panel. The display driving circuit also includes a system on chip, and the system on chip controls the opening time of the eye diagram measurement module according to the usage time of the display panel.

[0096] For display products that have been shipped to customers, due to various reasons such as heat and pressure difference during use, they will cause loss and aging of the display products. After that, the data transmission of the display products will be affected and the eye diagram will change. The embodiment of the present application can be set to automatically detect eye diagram changes and automatically correct the display data.

[0097] See also Figures 1 to 18 , Fig.18 This is a schematic diagram of the eye diagram measurement process provided by this application.

[0098] The time for automatically detecting the eye diagram can be determined according to the usage time of the display product. Specifically, the opening time of the eye diagram measurement module is preset. For example, when the cumulative usage time of the display panel reaches a preset time, such as 500 hours, the eye diagram measurement module is turned on, and the measurement starts to generate an eye diagram. The usage time of the display panel is confirmed by the timing control chip. When the cumulative time reaches the preset time, the eye diagram measurement module will automatically perform an eye diagram self-measurement and adjust the swing gear and / or the balance gear. The time for the eye diagram measurement module to self-measure can be controlled by the on-chip system, that is, when the display product is in standby mode, that is, the customer has not unplugged the plug, but the on-chip system has not output. At this time, when the display product will reach the self-measurement start condition, it will automatically power the drive circuit part of the display panel in the standby mode, so that the timing control chip and the data drive chip start working, but the backlight will not be powered. At this time, the customer cannot see the screen display, but the display product has automatically performed an eye diagram self-measurement and corrected the eye diagram compensation gear. When the user turns on the machine again, he will always get the output of the best eye diagram setting and the best picture quality.

[0099] The display product may be a display device.

[0100] It can be understood that the eye diagram measurement module will only be turned on and self-measurement will start only when the cumulative usage time of the display panel reaches the preset time and the display device is in standby mode. That is, the opening time and measurement working stage of the eye diagram measurement module in the embodiment of the present application are both in the standby stage of the display device, that is, the display panel is in a black screen state. This method does not require the customer to wait for the eye diagram measurement module to work, and can achieve the output of the optimal eye diagram setting, which can improve the user experience.

[0101] See also Figures 1 to 19 , Fig.19 It is a structural schematic diagram of an embodiment of a display device provided in the present application.

[0102] The present application provides a display device. The display device includes a display panel and the above-mentioned display driving circuit. The display device of the embodiment of the present application can measure and correct the eye diagram of the display data during use after leaving the factory to improve the eye diagram quality, thereby improving the display effect of the display device.

[0103] See also Figures 1 to 20 , Fig. 20 It is a flow chart of an implementation of a display driving method provided in the present application.

[0104] The present application provides a display driving method, which adopts the above-mentioned display driving circuit.

[0105] The display driving method specifically includes: S10: Generate eye diagram data.

[0106] Specifically, the eye diagram measurement module collects display data transmitted to the display panel via the data driving chip and generates eye diagram data.

[0107] S20: Compare the eye diagram data with the eye diagram template and feed back to the timing control chip and / or the data processing module.

[0108] Specifically, the eye diagram measurement module compares the eye diagram data with the eye diagram template and feeds back the results to the timing control chip and / or the data processing module.

[0109] In some embodiments, the eye diagram measurement module compares the eye diagram data with the eye diagram template. If the eye diagram data is less than or equal to the threshold range set by the eye diagram template, the first signal is output to the timing control chip, and the timing control chip adjusts the swing level of the data drive signal.

[0110] In some embodiments, the eye diagram measurement module compares the eye diagram data with the eye diagram template, and if the eye diagram data is less than or equal to the threshold range set by the eye diagram template, outputs a first signal to the timing control chip. The timing control chip adjusts the balance gear of the data drive signal according to the voltage value of the first signal. That is, in this embodiment, the balance gear is adjusted by the timing control chip.

[0111] In some embodiments, the eye diagram measurement module compares the eye diagram data with the eye diagram template, and if the eye diagram data is less than or equal to the threshold range set by the eye diagram template, the second signal is output to the data processing module of the data driver chip. The data processing module adjusts the balance gear of the data driver signal according to the voltage value of the second signal. That is, in this embodiment, the balance gear is adjusted by the data driver chip.

[0112] In some embodiments, the eye diagram measurement module compares the eye diagram data with the eye diagram template. If the eye diagram data is less than or equal to the threshold range set by the eye diagram template, the eye diagram measurement module preferentially feeds back the first signal to the timing control chip, and the timing control chip adjusts the swing gear of the data drive signal. If the eye diagram data regenerated after the swing gear of the data drive signal is adjusted to the maximum is less than or equal to the threshold range set by the eye diagram template, the timing control chip latches the current swing gear, and the eye diagram measurement module outputs the second signal to the data processing module, and the data processing module determines the balance gear of the data drive chip according to the voltage value of the second signal. In this embodiment, the swing gear is adjusted first, and when the swing gear is adjusted to the maximum gear and still does not meet the requirements of the eye diagram template, the balance gear is adjusted. Compared with adjusting the swing gear alone, the eye diagram quality can be further improved.

[0113] In some embodiments, the eye diagram measurement module compares the eye diagram data with the eye diagram template. If the eye diagram data is less than or equal to the threshold range set by the eye diagram template, the first signal is first fed back to the timing control chip to adjust the swing gear of the data drive signal until the swing gear of the data drive signal is adjusted to the maximum and the regenerated eye diagram data is less than or equal to the threshold range set by the eye diagram template. Then, the eye diagram measurement module outputs a second signal to the data processing module of the data drive chip to adjust the balance gear of the data drive signal. If the difference between the eye height of the eye diagram data and the eye height threshold set by the eye diagram template is greater than or equal to zero and less than a preset value, the eye diagram measurement module feeds back level information to the data processing module to latch the current balance gear. After latching the balance gear, if the eye height of the eye diagram data is greater than or equal to the preset eye height value, the eye diagram measurement module outputs a first signal to the timing control chip, and the timing control chip adjusts the swing gear of the data drive signal according to the first signal. In this embodiment, the swing gear is adjusted first, and when the swing gear is adjusted to the maximum gear and still does not meet the requirements of the eye diagram template, the balance gear is adjusted. If the swing is too large, the swing gear is further adjusted. This method can further improve the control accuracy of the eye diagram measurement, thereby further improving the eye diagram quality.

[0114] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0115] The above are only implementation methods of the present application, and are not intended to limit the patent protection scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A display driving circuit for a display panel, characterized in that: include: Timing control chip; A data driving chip, comprising a data processing module, wherein the data processing module is used to receive the data driving signal output by the timing control chip, process and generate display data, and transmit the data to the display panel; Wherein, the data driving chip also includes an eye diagram measurement module; the eye diagram measurement module is used to generate eye diagram data from the display data, compare the eye diagram data with an eye diagram template, and feed back to the timing control chip and / or the data processing module.

2. The display driving circuit according to claim 1, characterized in that: The eye diagram measurement module feeds back to the timing control chip; The eye diagram measurement module specifically includes: if the eye diagram data is less than or equal to the threshold range set by the eye diagram template, outputting a first signal to the timing control chip; The timing control chip adjusts the swing level of the data driving signal according to the first signal; or, the timing control chip adjusts the balance level of the data driving signal according to the voltage value of the first signal.

3. The display driving circuit according to claim 1, characterized in that: The eye diagram measurement module feeds back to the data processing module; the eye diagram measurement module specifically includes: If the eye diagram data is less than or equal to the threshold range set by the eye diagram template, output a second signal to the data processing module; The data processing module determines the balancing gear of the data driving signal according to the voltage value of the second signal.

4. The display driving circuit according to claim 1, characterized in that: The eye diagram measurement module is preferentially fed back to the timing control chip, and if the eye diagram data is less than or equal to the threshold range set by the eye diagram template, the eye diagram measurement module outputs a first signal to the timing control chip; If the eye diagram data regenerated after the swing level of the data driving signal is adjusted to the maximum is less than or equal to the threshold range set by the eye diagram template, the timing control chip latches the current swing level; After the timing control chip latches the current swing gear, the eye diagram measurement module outputs a second signal to the data processing module, and the data processing module determines the balance gear of the data driving chip according to the voltage value of the second signal.

5. The display driving circuit according to claim 4, characterized in that: After the data processing module determines the balancing gear of the data driving chip according to the voltage value of the second signal, the eye diagram measurement module further includes: If the difference between the eye height of the eye diagram data and the eye height threshold set by the eye diagram template is greater than or equal to zero and less than a preset value, feedback level information to the data processing module; The data processing module latches the current balancing gear.

6. The display driving circuit according to claim 5, characterized in that: After the data processing module latches the current balancing gear, the eye diagram measurement module further includes: If the eye height of the eye diagram data is greater than or equal to a preset eye height value, the eye diagram measurement module outputs the first signal to the timing control chip; The timing control chip adjusts the swing level of the data driving signal according to the first signal.

7. The display driving circuit according to claim 1, characterized in that: The timing control chip is also used to confirm the usage time of the display panel; the display driving circuit also includes an on-chip system, and the on-chip system controls the opening time of the eye diagram measurement module according to the usage time of the display panel.

8. The display driving circuit according to claim 1, characterized in that: The eye diagram measurement module includes a data acquisition module, an amplifier / attenuator, a phase-locked loop, a data clock recovery module, a trigger module and an eye diagram determination module which are connected in sequence; the data acquisition module is used to acquire the display data output by the data processing module; the display data is processed and output by the amplifier / attenuator, the phase-locked loop, the data clock recovery module and the trigger module in sequence, and is re-superimposed to generate the eye diagram data; the eye diagram determination module compares the eye diagram data with the eye diagram template, and feeds back the comparison result to the timing control chip and / or the data processing module.

9. A display device, characterized in that: The invention comprises a display panel and the display driving circuit according to any one of claims 1 to 8.

10. A display driving method, using the display driving circuit according to any one of claims 1 to 8, characterized in that: include: Generate eye diagram data; The eye diagram data is compared with the eye diagram template and fed back to the timing control chip and / or the data processing module.

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