[0040] Next, the technical solutions in the embodiments of the present invention will be described in conjunction with the drawings of the embodiments of the present invention, and it is clear that the described embodiments are intended to be in an embodiment of the invention, not all of the embodiments. In case of no conflict, embodiments and features of the following embodiment may be combined with each other. Based on the embodiments of the present invention, those of ordinary skill in the art to make all other embodiments without creative work acquired, it falls within the scope of the present invention.
[0041] like figure 1 Shown, the OLED (Organic Light Emitting Diode) display panel used in mobile phones, tablet computers, display devices, to provide a stable DC output voltage from the switching power supply manner. The display device comprises a main control circuit board, the main embodiment may be a flexible circuit board (MFPC, main flexible printed circuit) according to the present embodiment, MFPC (, or chip on film Chip On Flex Chip On Film) is connected to the display panel through the COF, the COF may be provided a control chip (IC) according to need.
[0042] When the output voltage fluctuates outside interference, in general, these display means sets the control circuit, the control circuit switching power supply according to a voltage regulator feedback display panel, the input voltage to compensate for the display panel, the display panel in order to achieve a stable input DC voltage.
[0043] The present inventors in the process of implementing the technical solution of the present application found that the switching power supply control circuit as a closed loop control system, the energy supply to the load is on demand, but the display panel used in the technical specifications and requirements may occur changes, exemplary, may be difference in luminance, the difference refresh rate, and the presence of the screen to quickly switch over the level of gray screen or the like, when these conditions occur, the display panel may load mutation.
[0044] like figure 2 As shown, a sudden increase in brightness or refresh rate suddenly increases, the display panel will be a sudden increase in load, which means that demand suddenly increased voltage, output voltage momentary drop. When the load variation amount generated quickly switch the monitor screen is smaller than the switching supply control circuit can withstand the load limit range, when the voltage feedback signal phase margin is large, the feedback voltage drop is too large, that is, slow response to emergency, when when the display panel is unable to complete the blanking period of the voltage regulator, it may easily lead to display driver circuit in the abnormality gate voltage. like image 3 As shown in this case, it may be in at least partial region of the display region of the panel light and dark stripes of the phenomenon.
[0045] Please continue see figure 2 and image 3When the amount of load change generated by the display screen is much larger than that the switching power control loop can withstand the load change range, the high refresh rate is shorter, and the voltage feedback signal is small, and the feedback is easily The signal is over-tuning phenomenon, the signal is turned, and the signal amplitude gain is brought long, so that the output voltage of the switching power supply output voltage causes the display driving circuit gate voltage to write abnormalities, and the blanking period cannot be included. When the time period, a clear dark cross pattern is formed in the display area.
[0046] like figure 2 As shown, when the load change amount of the display screen fast handover matches the switching power control loop can withstand the load variation range, the voltage feedback signal phase margin is suitable, the feedback voltage is small, slightly super-tone, drive the display The circuit gate voltage is not affected, and the display panel is displayed normally.
[0047] The present invention provides a display panel.
[0048] like Figure 4 As shown in some embodiments, the display panel includes a first signal line, a second signal line, a compensation resistor, a control switch tube, and a controller.
[0049] One of the first signal line and the second signal line is used to connect to the input of the DC power source, and the other is used to connect to the power supply voltage feedback path, which is only in the input of the first signal line and the DC power source. The end connection, the second signal line is exemplarily described with the power supply voltage feedback path connection. refer to figure 1 The display panel shown, the DC power source is a switching power supply of the display panel, and the power supply voltage feedback passage refers to the control circuit of the above-mentioned voltage feedback.
[0050] The number of compensation resistors in this embodiment is plural, please continue to see Figure 4 The plurality of compensation resistors R1, R2 ... Rn are connected in series on the first signal line, and the switch tubes T1, T2 ... TN correspond to the compensation resistors R1, R2 ... Rn, exemplary, in this embodiment, control The switch tube T1 corresponds to the compensation resistor R1 and is used to control the interventional state of the compensation resistor R1, and the control switch tube T2 corresponds to the compensation resistor R2 and is used to control the interventional state of the compensation resistor R2, and so on.
[0051] In this embodiment, the control switch tube is controlled to control the access state of the corresponding compensation resistance, and the control switch is controlled, the first end, and the second end, and the first end of the control switch is connected to the second signal line. The second end of the control switch is connected to one end connection of the corresponding control resistance from the input of the first signal line, and the control end of the switch tube is controlled, and the controller is used to control the opening and closing of the control switch tube.
[0052] Exemplary, under the control of the controller, the control switch tube T1 corresponding to the compensation resistor R1 is opened, and the remaining control switch tube is turned off, the resistor R1 access circuit is compensated, and the remaining compensation resistance is not an access circuit; when the compensation resistor R2 The corresponding control switch tube T2 is opened, and the remaining control switch tube is turned off, then the resistance R1 and the compensation resistor R2 access circuit are compensated. The remaining compensation resistance does not access the circuit. At this time, the total resistance is R1 plus R2; when compensated resistance RN The corresponding control switch tube TN is opened, and the remaining control switch tube is turned off, then the resistance R1 to the compensation resistor Rn all access circuit, the total resistance is R1 to Rn and σRI, I = 1, 2, 3 ... n. According to this type, by controlling the opening and closing of the control switch tube, the number of compensation resistors in the control of the access circuit can be realized, thereby implementing the resistance of the compensation resistance in the control access circuit.
[0053] Thus, the embodiment of the present invention can provide compensation load by providing a compensation resistance by controlling the number of compensation resistors in the access circuit in the input end of the DC power source and the power supply voltage feedback passage, and can provide compensation load by compensating resistance, reducing the load When changing, the fluctuation of the supply voltage of the display panel is displayed, thereby helping to reduce the bright and dark transverse stripes that may occur, help to improve the display effect.
[0054] like Figure 5 As shown in some embodiments, the display panel includes a substrate 501 and a driving circuit layer disposed on the substrate 501, the drive circuit layer includes a semiconductor layer 502, and the semiconductor layer 502 is mainly used to form a thin film transistor (TFT) active The compensation resistor includes a plurality of compensation resistance graphics, the compensation resistance pattern is provided with the semiconductor layer 502, and the semiconductor layer 502 is typically formed by a semiconductor material, exemplary, can be polysilicon. Semiconductor materials typically have relatively high resistivity, and is a suitable resistance material. By adjusting the size of the compensation resistor, a compensation resistor having different resistance can be formed. At the same time, only the shape of the mask version is required, and there is no need to change the process and step processes to help control manufacturing costs.
[0055] In some embodiments, at least a portion of the compensated resistance is graphically has a different aspect ratio to form a compensation resistor having different resistance values. Thus, the present embodiment can provide a compensation resistor having different resistance, thereby helping to improve the compensation effect.
[0056] Please continue see Figure 5 In some embodiments, the driving circuit layer further includes a source leak metal layer 504, and each compensation resistor is connected in series by a conductive cable, and the conductive cable is disposed in the same material of the source leak metal layer 504.
[0057] It should be understood that the semiconductor layer 502 of the display panel is used to form the active layer of the TFT, and the semiconductor layer 502 typically covers the insulating protective layer 503, and the source leak metal layer 504 passes through the via and active layer through the insulating protective layer 503. connect. In the present embodiment, the conductive connection of the connection compensation resistor is disposed in the same material as the source leak metal layer 504, so that the via hole of the source can 504 and the active layer can be opened on the insulating protective layer 503. The vias connecting the conductive connection line and the compensation resistor graphic are opened, and further, when the source leak metal layer 504 is formed, the conductive cable is simultaneously formed, and only the shape of the mask version (MASK) used in the graphical process is required. There is no need to make adjustments to process steps, which help control production costs. Subsequent, other membrane layers, such as flat layers 505, and the like, are further referred to in the related art, and will not be further defined and described herein.
[0058] In some embodiments, the controller includes a control chip and a compensation control switch corresponding to the control switch, which is used to provide a control switch tube, and the compensation control switch is disposed to control the control of the chip and the corresponding control switch tube. The compensation control switch is used to control the transmission of the open signal.
[0059] In the present embodiment, the controller continuously provides the opening signal of the control of the opening, and the compensation control switch RS1, RS2 ... RSN is used to control the transmission of the turning signal, which can be understood that when a compensation control switch is turned on, the open signal can be The control terminal transmitted to the corresponding control switch is transmitted to control the control switch tube to enter the circuit. When a compensation control switch is turned off, the turning signal cannot be passed to the control terminal of the corresponding control switch tube, so that the control switch is turned off.
[0060] Embodiments of the present invention provide a display device including any of the above display panels.
[0061] Since the display device of the present embodiment includes all of the technical solutions of the above display panel embodiment, at least the entire technical effect can be achieved, and details are not described herein again.
[0062] The present invention also provides a compensation control method of a display device, and is applied to the above-described display device.
[0063] like Image 6 As shown in one embodiment, the method comprises the following steps:
[0064] Step 601: When the load of the display panel is cycled between the first load and the second load, the display state of the display panel is acquired.
[0065] In this embodiment, the display panel of the control display device is switched between the first load and the second load. Here, the first load and the second load are loaded with different loads, and the differences should be relatively large to simulate the display panel. Load changes.
[0066] During the load switching process, the display status of the display panel is acquired, specifically whether there is a brightly dark horizontal stripe.
[0067] In some embodiments, this step 601 specifically includes:
[0068] The display image of the display panel is collected by the image acquisition device;
[0069] In the case where the display image includes bright and dark stripes that conform to the preset mode, the display state of the display panel is marked as an abnormality;
[0070] In the case where the display image does not include bright and dark stripes that conform to the preset mode, the display state of the display panel is marked normally.
[0071] In the present embodiment, the display image of the display panel can be taken with the image acquisition device of the camera, and further, the existing or improved image recognition algorithm can be used to identify whether there is a bright dark stripe in the display panel, here The preset mode can be determined by a preset experiment, for example, by controlling the load switching of the display panel to make the display panel produce bright and dark stripes, according to the bright dark stripe, the preset mode is determined, and subsequently determined according to the determined preset mode Bright dark stripes perform identification of the display to ensure that the identified display state is abnormal.
[0072] In step 602: When the display state of the display device is abnormal, the number of compensation resistors that control the access is gradually increased.
[0073] Please refer to figure 2 If the display state of the display panel is abnormal, it indicates that the switching power supply control loop has an over-tuning. At this time, the number of compensation resistors that control the access is gradually increased, exemplary, and the control switch t1 is turned on, the remaining control switch tube Close, if the display status is still abnormal, the control control switch tube T2 is turned on, and the remaining control switch tube is controlled, and this type is pushed.
[0074] As the number of compensation resistors of the access control circuit increases, the phase margin is delayed.
[0075] In step 603: When the display state of the display device is normal, the access state of the compensation resistor is acquired as a compensation result for the display panel.
[0076] When the display device is detected, the phase margin is appropriate. At this time, the display screen is completed, at which time the compensation status of the display panel is used as the compensation result, the compensation state specifically refers to the access circuit. The number of compensation resistors.
[0077] Based on the current compensation state, it is possible to make the display panel have a suitable phase margin, thereby increasing the stability of the DC voltage provided by the switching voltage, reducing the possibility of bright and dark stripes caused by load changes, which helps to improve the display effect. .
[0078] In some embodiments, the controller includes a control chip and a compensation control switch corresponding to the control switch tube, the access state of the acquisition resistor as a compensation result for the display panel, including:
[0079] Get the switch state of each of the compensation control switches;
[0080] The switching state of the compensation control switch is written to the control chip, and when the display panel is activated, the compensation control switch is initiated.
[0081] In this embodiment, after the compensation state is determined, the switch state of the holding compensation control switch is not changed, and the switching state of the compensation control switch is written to the control chip, and when the electronic device is subsequent, for example, when restarting, still according to the The compensation status is compensated for the display panel, which reduces the possibility of bright and dark stripes, which helps improve the display effect.
[0082] In some embodiments, the display period of the display panel includes a display period corresponding to each frame image and a blanking time before each of the display periods;
[0083] The access state of the acquisition of the compensation resistor also includes:
[0084] In the case where the display panel displays the image, the display panel is compensated according to the compensation period.
[0085] In this embodiment, the control switch is in an open state between the first end and the second end, when the control terminal is in low level, when the control terminal is in a low level, between the first end and the second end state.
[0086] When implementing, the control switch tube T1 corresponding to the compensation resistor R1 closest to the input of the first signal line can be default, and then further referring to the above process to control the opening and closing of each control switch tube.
[0087] Please refer to figure 2 and Figure 7 When a high and low level conversion occurs, the conversion should be located within the blanking period, thereby ensuring that the compensation adjustment of the display panel is completed in the blanking period, and the impact on the display effect can be reduced.
[0088] like Figure 8 As shown, the compensation control method of the display device of the present embodiment can be summarized, first controlling the display panel of the display device between the high and low load, the display state of the display panel is continuously monitored during the switching process.
[0089] At the same time, the feedback path impedance selection instruction is specifically used to control the display panel execution in the control chip. Image 6 The control method in step 602 in the illustrated embodiment is shown.
[0090] When the display state abnormality of the display panel is detected, the number of compensation resistors that control the access circuit gradually increases. When the display state of the display panel is detected, the display panel is compensated according to the compensation result at this time.
[0091] During the above process, the detection process of the display state of the display panel can be continuously performed until the compensation of the display panel is completed.
[0092] The above is only the specific embodiments of the present invention, but the scope of the invention is not limited thereto, and any technicress, those skilled in the art, can easily think of change or replacement within the scope of the present invention, and should be covered. Within the protection range of the present invention. Therefore, the scope of the invention should be based on the scope of protection of the claims.
