CN114242014A - COF temperature control circuit, driving method and terminal equipment - Google Patents

COF temperature control circuit, driving method and terminal equipment Download PDF

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Publication number
CN114242014A
CN114242014A CN202111553513.1A CN202111553513A CN114242014A CN 114242014 A CN114242014 A CN 114242014A CN 202111553513 A CN202111553513 A CN 202111553513A CN 114242014 A CN114242014 A CN 114242014A
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voltage
picture
liquid crystal
crystal panel
quality table
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CN114242014B (en
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傅晓立
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Shenzhen Skyworth RGB Electronics Co Ltd
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Shenzhen Skyworth RGB Electronics Co Ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/10—Special adaptations of display systems for operation with variable images
    • G09G2320/103—Detection of image changes, e.g. determination of an index representative of the image change
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management

Abstract

The utility model discloses a COF temperature control circuit, a driving method and a terminal device, wherein the COF temperature control circuit is connected with a liquid crystal panel and comprises the following components: the main control module is used for generating a first control signal to the voltage switching module and outputting a first image quality table to the liquid crystal panel when detecting that the input picture is a heavy-load picture, and generating a second control signal to the voltage switching module and outputting a second image quality table to the liquid crystal panel when detecting that the input picture is a non-heavy-load picture; the voltage switching module is used for respectively outputting a first voltage and a second voltage to the liquid crystal panel according to the first control signal and the second control signal. When the input picture is detected to be the heavy-load picture, the main control module outputs a corresponding picture quality table to the liquid crystal panel, and the voltage switching module is controlled to output the first voltage to the liquid crystal panel, so that the temperature of the liquid crystal panel during picture display is regulated and controlled, and the problems of abnormal display of the liquid crystal panel and burning of COF IC are effectively solved.

Description

COF temperature control circuit, driving method and terminal equipment
Technical Field
The utility model relates to the technical field of electronic circuits, in particular to a COF temperature control circuit, a driving method and terminal equipment.
Background
COF (Chip on film), which is a technology for packaging a Chip and a flexible printed circuit board (FPC), in which a Chip is combined with a flexible substrate circuit by using a flexible additional circuit board as a carrier for packaging the Chip, or a flexible additional circuit board without a packaged Chip, including tape-on-tape packaging (TAB substrate, the process is called TCP), a flexible board connecting Chip assembly, and flexible IC carrier packaging), is an important component for driving an LCD (liquid crystal display) panel, as shown in FIG. 1. The COF is a Source driver IC (Source driver chip: mobile phone architecture with integrated frame memory/Source driver IC) bound on panel and S-PCBA (Source Printed Circuit Board Assembly: large, high-density Source Printed Circuit Board Assembly) through a film. The input end of a Source driver IC (Source driver IC) is bound on the S-PCBA through a connecting finger, and the output end of the Source driver IC is bound on the panel through the connecting finger. When the line scanning signal of the goa (gate On array) panel drives each row of TFTs (Thin Film transistors) to be turned On line by line, each output channel (each column) of the cof (or Source driver) inputs a specific voltage to the Data line of the panel, so as to charge the liquid crystal of the panel and drive the liquid crystal panel to light. As shown in fig. 2, which is a schematic diagram of COF (Source driver) charging the liquid crystal panel, when the Gate line is pulled high, the TFT transistor is opened, and the COF output channel charges the liquid crystal capacitor through the Source line.
As the resolution or refresh rate of the lcd panel is higher (such as 8K 120HZ panel), the COF is carried more and more, especially for the heavy-duty picture (such as H _ trip picture), the Source voltage of each line is reversed, so that the carrier is the largest for the COF, and the COF temperature is the highest. FIG. 3 is a diagram of an H _ strip reloading picture and its enlargement to the pixel level. Because the Source output needs to be inverted every row in the H _ strip picture, the power consumption is the largest, and the surface temperature of the Source IC is the highest, which easily causes the COF to have a phenomenon of over-high temperature when the COF loads a heavy-load picture, and causes the problem of abnormal display of the panel, even burning of the COF IC.
Thus, the prior art has yet to be improved and enhanced.
Disclosure of Invention
The utility model mainly aims to provide a COF temperature control circuit, a driving method and a terminal device, and aims to solve the problem that in the prior art, when a load picture is loaded, a COF is easy to have a phenomenon of overhigh temperature, so that abnormal display of a panel and even burning of a COF IC can be caused.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a COF temperature control circuit comprises a main control module and a voltage switching module; the main control module is respectively connected with the liquid crystal panel and the voltage switching module, and the voltage switching module is also connected with the liquid crystal panel; the main control module is used for generating a first control signal to the voltage switching module and outputting a first image quality table to the liquid crystal panel when detecting that an input picture is a heavy-load picture, and generating a second control signal to the voltage switching module and outputting a second image quality table to the liquid crystal panel when detecting that the input picture is a non-heavy-load picture; the voltage switching module is used for respectively outputting a first voltage and a second voltage to the liquid crystal panel according to the first control signal and the second control signal.
In the COF temperature control circuit, the voltage switching module includes: a switching unit and a voltage output unit; the switch unit is respectively connected with the main control module and the voltage output unit; the voltage output unit is also connected with the liquid crystal panel and the switch unit and is used for correspondingly generating a first voltage selection signal and a second voltage selection signal according to the first control signal and the second control signal; the voltage output unit is used for correspondingly and respectively outputting the first voltage and the second voltage to the liquid crystal panel according to the first voltage selection signal and the second voltage selection signal.
In the COF temperature control circuit, the main control module comprises a control unit and an image quality table switching unit; the control unit is connected with the voltage switching module, and the image quality table switching unit is connected with the liquid crystal panel; the control unit is configured to output the first control signal and the second control signal to the voltage switching module, and the image quality table switching unit is configured to output the first image quality table to the liquid crystal panel when detecting that the picture is the heavy-load picture, and output the second image quality table to the liquid crystal panel when detecting that the picture is the non-heavy-load picture.
In the COF temperature control circuit, the switching unit includes: the MOS transistor comprises a first MOS transistor and a second MOS transistor; the source electrodes of the first MOS tube and the second MOS tube are connected with the voltage output unit; the grids of the first MOS tube and the second MOS tube are connected with the main control module; and the drain electrodes of the first MOS tube and the second MOS tube are connected with a power supply pin.
In the COF temperature control circuit, the voltage output unit includes: a first voltage partition memory and a second voltage partition memory; the first voltage partition memory is respectively connected with the source electrode of the first MOS tube and the liquid crystal panel; the second voltage partition memory is respectively connected with the source electrode of the second MOS tube and the liquid crystal panel; the first voltage partition memory is used for storing the first voltage; the second voltage partition memory is used for storing the second voltage.
In the COF temperature control circuit, the image quality table switching unit includes: a first picture quality table memory and a second picture quality table memory; the first image quality table memory and the second image quality table memory are both connected with the liquid crystal panel.
A COF temperature control method based on the COF temperature control circuit as described above, the COF temperature control method comprising the steps of:
the main control module detects an input picture and judges whether the picture is a heavy-load picture;
when the picture is detected to be the heavy-load picture, the main control module outputs the first control signal to the voltage switching module and outputs the first picture quality table to the liquid crystal panel;
the voltage switching module outputs the first voltage to the liquid crystal panel according to the first control signal;
and the liquid crystal panel displays a picture according to the first picture quality table.
In the COF temperature control method, when it is detected that the picture is the loaded picture, the step of outputting the first control signal to the voltage switching module by the main control module and outputting the first picture quality table to the liquid crystal panel includes:
when the main control module detects that the picture is the heavy load picture, the main control module outputs the first control signal to a first MOS tube and a second MOS tube;
the first MOS tube and the second MOS tube generate a first voltage selection signal to a first voltage partition memory according to the first control signal;
the first voltage partition memory outputs the first voltage to the liquid crystal panel according to the first voltage selection signal.
In the COF temperature control method, the step of detecting an input picture by the main control module and judging whether the picture is the reloading picture further includes:
when the picture is detected to be the non-load picture, the main control module outputs a second control signal to the voltage switching module and outputs the second picture quality table to the liquid crystal panel;
the voltage switching module outputs the second voltage to the liquid crystal panel according to the second control signal;
and the liquid crystal panel displays the picture according to the second picture quality table.
A COF temperature control terminal device comprises a PCB, wherein the PCB is provided with the COF temperature control circuit.
Compared with the prior art, the utility model provides a COF temperature control circuit, a driving method and a terminal device, wherein the COF temperature control circuit is connected with a liquid crystal panel and comprises the following components: the main control module is used for generating a first control signal to the voltage switching module and outputting a first image quality table to the liquid crystal panel when detecting that the input picture is a heavy-load picture, and generating a second control signal to the voltage switching module and outputting a second image quality table to the liquid crystal panel when detecting that the input picture is a non-heavy-load picture; the voltage switching module is used for respectively outputting a first voltage and a second voltage to the liquid crystal panel according to the first control signal and the second control signal. When the input picture is detected to be the heavy-load picture, the main control module outputs a corresponding picture quality table to the liquid crystal panel, and the voltage switching module is controlled to output the first voltage to the liquid crystal panel, so that the temperature of the liquid crystal panel during picture display is regulated and controlled, and the problems of abnormal display of the liquid crystal panel and burning of COF IC are effectively solved.
Drawings
Fig. 1 is a schematic view of a COF provided by the present invention and its position in a full panel drive;
FIG. 2 is a schematic diagram of a COF (Source driver) charging a liquid crystal panel according to the present invention;
FIG. 3 shows an H _ strip picture and the brightness of its pixels according to the present invention;
FIG. 4 is a schematic diagram of the temperature distribution of the heavy load and the non-heavy load provided by the present invention;
FIG. 5 is a schematic diagram of signal traces of an AVDD entering a COF according to the present invention;
FIG. 6 is a schematic diagram of the V _ Block failure due to the COF temperature being too high;
fig. 7 is a block diagram of a COF temperature control circuit according to the present invention;
fig. 8 is a circuit diagram of the voltage switching module and the main control module provided in the present invention;
FIG. 9 is a schematic timing diagram of a heavy loading picture and a non-heavy loading picture in the COF temperature control circuit according to the present invention;
fig. 10 is a flowchart illustrating a process of loading a reloading picture in the COF temperature control method according to the present invention;
fig. 11 is a flowchart of step S200 in the COF temperature control method according to the present invention;
fig. 12 is a flowchart of loading a non-reloading screen in the COF temperature control method according to the present invention.
Reference numerals: 10: a COF temperature control circuit; 20: a liquid crystal panel; 100: a main control module; 110: a control unit; 120: an image quality table switching unit; 200: a voltage switching module; 210: a switch unit; 220: a voltage output unit; and (B) Bank A: a first voltage partition memory; and B, Bank: a second voltage partition memory; table group 1: a first image quality table memory; table group 2: a second image quality table memory; m1: a first MOS transistor; m2: and a second MOS transistor.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The temperature of the COF/Source IC is also closely related to the supply voltage thereof, especially the analog supply voltage AVDD. The higher the AVDD voltage, the greater the IC power consumption, which is the product of voltage and current, and the higher the surface temperature of the Source IC. Fig. 4 shows the COF temperature test results of 658K 120HZ panels under AVDD 15V conditions (taking H _ strip picture and white picture as examples). As can be seen from the graph, the COF temperature shows a distribution tendency of high in the middle and gradually decreasing on both sides. The reason for this is shown in fig. 5, and the signal trend of AVDD is that AVDD is generated from PMIC (Power Management IC: Power Management integrated circuit), and then goes through TCON board, FFC (Flexible Flat Cable, which is a PET insulating material and extremely thin tin-plated Flat copper wire), and XB and then enters each COF in turn, which results in that the total trace length of some AVDDs before entering COF is relatively short and some AVDDs before entering COF is relatively long. The AVDD of COF6 and COF7 is the shortest in trace length, and the voltage attenuation of the AVDD is the smallest. Along with the AVDD routing direction, the AVDD routing is sequentially lengthened from the middle to both sides, and the corresponding AVDD voltage attenuation is also continuously increased, for example, the AVDD voltage of the COF6 is 14.8V, and the AVDD voltage attenuation of the COF1 is 14.3V. Then, the COF6 and COF7 consume more power than other COFs and have a higher COF surface temperature than other COFs. This is true in fact, the temperatures of COF6 and COF7 are the highest in fig. 4, 132 ℃ and 128 ℃, respectively.
For different COFs, the operating temperatures are different, and the junction temperature (generally, the highest junction temperature allowed in an on state) specification of most COF ICs is about 150 ℃, but the temperature resistance of the glue used on the COF film is less than 150 ℃. Moreover, some ICs have low temperature resistance, and the junction temperature specification is only about 125 ℃. In order to operate COFs within their specification temperature range, screen manufacturers will specify the temperature of the COF IC, typically 115 ℃ or 120 ℃ (8K 120HZ or other high-end product). If the COF IC operating temperature exceeds 120 ℃, the IC may output an abnormality, causing the panel display to be abnormal. As shown in fig. 6, the COF IC exceeds its temperature specification, an IC operation abnormality occurs, and finally the panel shows a V _ Block (vertical Block) abnormality.
In order to reduce the COF temperature, the AVDD voltage is usually adjusted downward, but the AVDD voltage is adjusted downward, which also causes other problems, such as a decrease in transmittance and a decrease in brightness.
In view of the above problems, according to the COF temperature control circuit, the driving method and the terminal device provided by the utility model, when the main control module detects that the loading screen needs to be loaded, the main control module controls the voltage switching module to output the first voltage and controls to output the corresponding image quality table, so that the temperature of the COF when the loading screen is loaded is effectively reduced, and the problems of abnormal display of the liquid crystal panel and burning of the COF IC are further improved.
The following describes a COF temperature control circuit design scheme by using specific exemplary embodiments, and it should be noted that the following embodiments are only used to explain the technical scheme of the utility model, and are not specifically limited:
referring to fig. 7, a COF temperature control circuit 10 according to the present invention is connected to a liquid crystal panel 20, wherein the COF temperature control circuit 10 includes a main control module 100 and a voltage switching module 200; the main control module 100 is respectively connected to the liquid crystal panel 20 and the voltage switching module 200; the voltage switching module 200 is further connected to the liquid crystal panel 20; the main control module 100 is configured to generate a first control signal to the voltage switching module 200 and output a first image quality table to the liquid crystal panel when detecting that the input frame is a heavy-loading frame, and to generate a second control signal to the voltage switching module 200 and output a second image quality table to the liquid crystal panel when detecting that the input frame is a non-heavy-loading frame；The voltage switching module 200 is configured to output a first voltage and a second voltage to the liquid crystal panel 20 according to the first control signal and the second control signal, respectively. In the present embodiment, the main control module is an SOC (System-on-a-Chip, also called System on Chip, which means that it is a product and is an integrated circuit with a dedicated target, including the complete System and having all contents of embedded software) or a TCON (Timing controller: Timing control master Chip, which generates goattiming, Data, and integrates various IPs).
Specifically, when the main control module 100 detects that an input is a heavy-load picture (e.g., H _ strip picture), first, the main control module 100 generates the first control signal (transmitted through the pins P1 and P2 in the embodiment of the present invention) to the voltage switching module 200, and at the same time, the main control module 100 outputs a first picture quality table corresponding to the first voltage (AVDD' voltage in the embodiment of the present invention) to the liquid crystal panel 20, and then, the voltage switching module 200 outputs the first voltage to the liquid crystal panel 20 according to the first control signal, and finally, the liquid crystal panel 20 displays a normal heavy-load picture according to the first picture quality table.
When the host module 100 detects that a non-reloading picture (e.g., a white picture) is inputted, first, the main control module 100 generates the second control signal to the voltage switching module 200, meanwhile, the main control module 100 outputs a second image quality table corresponding to the second voltage (AVDD voltage in the embodiment of the present invention) to the liquid crystal panel 20, then, the voltage switching module 200 outputs the second voltage (in the embodiment of the present invention, the first voltage is lower than the second voltage, i.e. AVDD '< AVDD, and the magnitude relationship between the first voltage and the second voltage can be obtained by pre-adjusting, for example, AVDD' is just adjusted to make the temperature of COF6/COF7 within the specification) to the liquid crystal panel 20 according to the second control signal, and finally, the normal non-reloading screen is displayed by the liquid crystal panel 20 according to the second image quality table.
In the present invention, when the main control module 100 detects that the input is a heavy load screen, the voltage switching module 200 is controlled to output the first voltage lower than the second voltage to the liquid crystal panel 20, and output the first image quality table corresponding to the first voltage to the liquid crystal panel 20, so that the temperature of the COF can be reduced, the problem of abnormal screen display of the liquid crystal panel 20 due to an over-high temperature can be effectively solved, meanwhile, the problem of damage of the COF IC due to an over-high temperature can be solved, the power consumption can be reduced, the electric energy can be saved, and the environmental protection can be contributed; when the main control module 100 detects that the input image is a non-reloading image, the voltage switching module 200 is controlled to output a default voltage (a second voltage in the embodiment of the present invention) to the liquid crystal panel 20 and output a second image quality table corresponding to the default voltage to the liquid crystal panel 20, so as not to affect the normal display of the non-reloading image; furthermore, when the loading screen is loaded, the voltage switching module 200 is controlled to output the first voltage to the liquid crystal panel 20 and output the first picture quality table corresponding to the first voltage to the liquid crystal panel 20, so that the display quality of the liquid crystal panel is effectively prevented from being reduced under the condition that the COF temperature is reduced.
Further, referring to fig. 8, the main control module 100 includes: a control unit 110 and an image quality table switching unit 120; the control unit 110 is connected to the voltage switching module, and the image quality table switching unit 120 is connected to the liquid crystal panel; the control unit 110 is configured to output the first control signal and the second control signal to the voltage switching module, and the image quality table switching unit 120 is configured to output the first image quality table to the liquid crystal panel when detecting that the picture is the heavy-load picture, and output the second image quality table to the liquid crystal panel when detecting that the picture is the non-heavy-load picture.
Specifically, when the control unit 110 detects that an input is a reloading picture, firstly, the control unit 110 generates the first control signal to the switch unit 210, and the picture quality table switching unit 120 outputs the first picture quality table to the liquid crystal panel, secondly, the switch unit 210 generates the first voltage selection signal according to the first control signal, secondly, the voltage output unit 220 outputs the first voltage to the liquid crystal panel according to the first control signal, and finally, the liquid crystal panel 20 displays a normal reloading picture according to the first picture quality table.
When the control unit 110 detects that the input image is a non-heavy-load image, the control unit 110 generates the second control signal to the switch unit 210, and the image quality table switching unit 120 outputs the second image quality table to the liquid crystal panel, and then the switch unit 210 generates the second voltage selection signal according to the second control signal, and then the voltage output unit 220 outputs the second voltage to the liquid crystal panel according to the second control signal, and finally the liquid crystal panel 20 displays the normal non-heavy-load image according to the second image quality table.
In the present invention, when the control unit 110 detects whether an input picture is a heavy-load picture, the control unit controls to output the first control signal or the second control signal to the voltage switching module, so that the voltage switching module can output the first voltage or the second voltage to the liquid crystal panel, and the picture quality table switching unit 120 correspondingly outputs the first picture quality table or the second picture quality table to the liquid crystal panel, thereby effectively adjusting the temperature of the liquid crystal panel during picture display according to different input pictures, and improving the problems of abnormal display of the liquid crystal panel and burning of a COF IC.
Further, the voltage switching module 200 includes: a switching unit 210 and a voltage output unit 220; the switch unit 210 is respectively connected to the main control module 100 and the voltage output unit 220, and the voltage output unit 220 is further connected to the liquid crystal panel 20; the switch unit 210 is configured to generate a first voltage selection signal and a second voltage selection signal according to the first control signal and the second control signal respectively; the voltage output unit 220 is configured to output the first voltage and the second voltage to the liquid crystal panel 100 according to the first voltage selection signal and the second voltage selection signal, respectively.
Specifically, when the main control module 100 detects that the input is a heavy-duty screen, firstly, the main control module 100 generates the first control signal to the switch unit 210, secondly, the switch unit 210 generates the first voltage selection signal according to the first control signal, and then, the voltage output unit 220 outputs the first voltage to the main control module 100 according to the first voltage selection signal, so that the main control module 100 performs the next operation.
When the main control module 100 detects that the input image is a non-heavy-load image, in a similar manner, firstly, the main control module 100 generates the second control signal to the switch unit 210, secondly, the switch unit 210 generates the second voltage selection signal according to the second control signal, and then, the voltage output unit 220 outputs the second voltage to the main control module 100 according to the second voltage selection signal, so that the main control module 100 performs the next operation.
In the present invention, when it is detected that a loaded picture is input, the switch unit 210 correspondingly generates the first voltage selection signal according to the first control signal output by the main control module 100, so as to select the voltage output unit 220 to output the corresponding first voltage, thereby effectively forming a voltage selection signal; the voltage output unit 220 outputs the first voltage according to the first voltage selection signal, thereby effectively reducing the temperature of the COF and improving the problem of abnormal display of the liquid crystal panel 20 due to over-temperature.
Further, with continued reference to fig. 8, the switch unit 210 includes: a first MOS transistor M1, a second MOS transistor M2, and a power supply pin (Bank _ sel pin in the present embodiment); the sources of the first MOS transistor M1 and the second MOS transistor M2 are both connected to the voltage output unit 220; the gates of the first MOS transistor M1 and the second MOS transistor M2 are both connected to the main control module 100; the drains of the first MOS transistor M1 and the second MOS transistor M2 are both connected to a power supply pin. Wherein the power supply pin is connected to 3.3V or VGH (VGH is a voltage for opening a TFT switch in the GOA panel).
Specifically, when the SOC or TCON detects that the input is a heavy-duty image, first, the SOC or TCON generates the first control signal to the first MOS transistor M1 and the second MOS transistor M2, and then the first MOS transistor M1 and the second MOS transistor M2 generate the first voltage selection signal according to the first control signal (in the embodiment of the present invention, the first control signal is a logic signal "01" output by the P1 and the P2, wherein "1" is high level, and the second MOS transistor M2 can be turned on), and transmit the first voltage selection signal to the voltage output unit 220, so that the voltage output unit 220 performs the next operation.
When the SOC or TCON detects that the input image is a non-heavy-load image, in a similar manner, first, the SOC or TCON generates the second control signal to the first MOS transistor M1 and the second MOS transistor M2, and then, the first MOS transistor M1 and the second MOS transistor M2 generate the second voltage selection signal according to the second control signal (in the embodiment of the present invention, the second control signal is a logic signal "10" output by the P1 and the P2, where "1" is a high level, and the first MOS transistor M1 may be turned on), and transmit the second voltage selection signal to the voltage output unit 220, so that the voltage output unit 220 performs the next operation.
In the present invention, a switching circuit is formed by the first MOS transistor M1 and the second MOS transistor M2, and is respectively turned on according to logic signals formed by combining the first control signal and the second control signal, so that the corresponding voltage output unit 220 is selected when a heavy load picture is loaded. The first MOS transistor M1 and the second MOS transistor M2 may be disposed outside the COF IC or within the SOC/TCON.
Further, the voltage output unit 220 includes: a first voltage partition memory Bank a and a second voltage partition memory Bank B; the first voltage partition memory Bank a is respectively connected with the source electrode of the first MOS transistor M1 and the liquid crystal panel 20; the second voltage partition memory Bank B is respectively connected with the source of the second MOS transistor M2 and the liquid crystal panel 20; the first voltage partition memory Bank a is used for storing the first voltage; the second voltage partition memory Bank B is used to store the second voltage. And voltage signals of AVDD/HAVDD, GM1-GM14 and the like are arranged in the first voltage partition memory Bank A and the second voltage partition memory Bank B, wherein the voltage signals in the first voltage partition memory Bank A are marked as AVDD ', HAVDD' and GM1 '-GM 14'. The first voltage partition memory Bank a and the second voltage partition memory Bank B are both disposed in a PMIC (Power Management IC) for managing Power devices in a host system.
Specifically, when the first MOS transistor M1 and the second MOS transistor M2 generate the first voltage selection signal according to the first control signal, that is, when the first MOS transistor M1 is turned off and the second MOS transistor M2 is turned on to generate the first voltage selection signal to the first voltage partition memory Bank a (Bank a in the embodiment of the present invention, in which the AVDD' voltage is stored), the first voltage partition memory Bank a outputs the first voltage to the liquid crystal panel 20 according to the first voltage selection signal, so as to perform the next operation.
Similarly, when the first MOS transistor M1 and the second MOS transistor M2 generate the second voltage selection signal according to the second control signal, that is, when the first MOS transistor M1 is turned on and the second MOS transistor M2 is turned off, and the second voltage selection signal is generated to the second voltage partition memory Bank B (Bank B in the embodiment of the present invention, in which the AVDD voltage is stored), the second voltage partition memory Bank B outputs the second voltage to the liquid crystal panel 20 according to the second voltage selection signal, so as to perform the next operation.
In the present invention, the first voltage and the second voltage are respectively and correspondingly stored in the first voltage sub-area memory Bank a and the second voltage sub-area memory Bank B, and the first voltage stored in the first voltage sub-area memory Bank a is selectively output to the liquid crystal panel 20 when a heavy load picture is loaded, so that a rapid voltage switching is formed, and the temperature of the COF at this time is reduced.
Further, the image quality table switching unit 120 includes: a first picture quality Table memory Table group1 and a second picture quality Table memory Table group 2; the first image quality Table memory Table group1 and the second image quality Table memory Table group 2 are both connected to the liquid crystal panel 20. The first and second quality Table memories Table group1 and Table group 2 (both belonging to PQ tables) are both disposed in the TCON/SOC, and these two sets of PQ tables are mainly placed with IPs related to AVDD/Gamma voltages, such as ACC tables, OD tables, etc., so as to correspond to two sets of voltage signals, such as AVDD/HAVDD and GM1-GM14, disposed in the first and second voltage partition memories Bank a and Bank.
Specifically, when the control unit 110 detects that the frame is the overloaded frame, the first frame quality Table memory Table group1 directly outputs the first frame quality Table corresponding to the first voltage to the liquid crystal panel 20, and then the liquid crystal panel 20 displays the normal overloaded frame according to the first frame quality Table.
When the control unit 110 detects that the picture is the overloaded picture, similarly, the second picture quality Table memory Table group 2 directly outputs the second picture quality Table corresponding to the second voltage to the liquid crystal panel 20, and then the liquid crystal panel 20 displays the normal non-overloaded picture according to the second picture quality Table.
In the utility model, the first image quality Table and the second image quality Table are respectively and correspondingly stored in the first image quality Table storage Table group1 and the second image quality Table storage Table group 2, when the reloaded picture is loaded, the first image quality Table storage Table group1 is controlled to output the first image quality Table corresponding to the first voltage to the liquid crystal panel 20, when the non-reloaded picture is loaded, the second image quality Table storage Table group 2 is controlled to output the second image quality Table corresponding to the second voltage to the liquid crystal panel 20, so that the liquid crystal panel 20 is ensured to display the normal reloaded picture according to the first image quality Table and the normal non-reloaded picture according to the second image quality Table.
For better understanding of the present invention, the operation principle of the COF temperature control circuit 10 of the present invention is explained in detail below with reference to fig. 7:
when the control unit 110 detects that the frame is the reloading frame (for example, an H _ strip frame), firstly, the control unit 110 generates the first control signal, and transmits the first control signal to the first MOS transistor M1 and the second MOS transistor M2 through pins P1 and P2, and at the same time, the first Table group1 (Table group1 in the embodiment of the present invention) directly outputs the first Table corresponding to the first voltage to the liquid crystal panel 20; then, the first MOS transistor M1 is turned off according to the first control signal (at this time, the first control signal outputted by P1 and P2 is logic signal "01"), and the second MOS transistor M2 is turned on according to the first control signal, thus generating the first voltage selection signal to the first voltage partition memory Bank a, i.e. Bank a in the embodiment of the present invention; secondly, the first voltage partition memory Bank a outputs the first voltage to the liquid crystal panel 20 according to the first voltage selection signal, that is, outputs the AVDD' voltage of the embodiment of the present invention to the liquid crystal panel 20; finally, the normal reloading screen is displayed by the liquid crystal panel 20 according to the first image quality table.
The reason why the GM1-GM14 is divided by AVDD, especially GM1 and AVDD need to satisfy a certain relationship, is that the first Table memory Table group1 outputs the first Table corresponding to the first voltage to the liquid crystal panel 20, otherwise, there is a problem of abnormal display. For example, many Source driver ICs require AVDD-GM1>0.2V, so that the normal operating requirements of the Source driver IC can be met by reducing the AVDD voltage and, for example, reducing GM 1. Once GM1 is adjusted, GM2-GM14, HAVDD, ACC table, etc. need to be adjusted correspondingly to meet the PQ requirement of panel. Therefore, when P1P2 is 01 and the AVDD voltage is reduced to AVDD ', the TCON/SOC needs to call the PQ Table corresponding to AVDD' and Gamma voltages in Bank a, i.e., Table group1 in the embodiment of the present invention, in addition to controlling PMIC to select Bank a.
When the control unit 110 detects that the frame is the non-reloaded frame (for example, a white frame), in a similar manner, first, the control unit 110 generates the second control signal to the first MOS transistor M1 and the second MOS transistor M2, and at the same time, the second Table group 2 (Table group 2 in the embodiment of the present invention) directly outputs the second Table corresponding to the second voltage to the liquid crystal panel 20; then, the first MOS transistor M1 is turned on according to the second control signal (at this time, the second control signal outputted by P1 and P2 is logic signal "10"), and the second MOS transistor M2 is turned off according to the second control signal, so that the second voltage selection signal is generated to the second voltage partition memory Bank B, that is, Bank B in the embodiment of the present invention; secondly, the second voltage partition memory Bank B outputs the second voltage to the lcd panel 20 according to the second voltage selection signal, that is, outputs the AVDD voltage (and AVDD' < AVDD) of the embodiment of the present invention to the lcd panel 20; finally, the normal non-reloading screen is displayed by the liquid crystal panel 20 according to the second image quality table.
Further, as please refer to fig. 9, which is a timing diagram of the reloading picture and the non-reloading picture corresponding to the COF temperature control circuit 10 according to the present invention, since the Data timings of the reloading picture and the non-reloading picture are different, when the TCON/SOC detects different timings corresponding to the reloading picture and the non-reloading picture, the reloading picture and the non-reloading picture can be detected. The AVDD1 is a voltage corresponding to the loading of the reloading picture, and the Data1 is a corresponding time sequence when the reloading picture is loaded; AVDD2 is the corresponding voltage when the non-reloading picture is loaded, and Data2 is the corresponding time sequence when the non-reloading picture is loaded; ST is a start signal for scanning the liquid crystal panel.
Further, referring to fig. 10, the present invention further provides a COF temperature control method based on the COF temperature control circuit 10, wherein the COF temperature control method includes the following steps:
s100, the main control module 100 detects an input picture and judges whether the picture is the reloading picture.
S200, when the picture is detected to be the loaded picture, the main control module 100 outputs the first control signal to the voltage switching module 200, and outputs the first picture quality table to the liquid crystal panel 20.
S300, the voltage switching module 200 outputs the first voltage to the liquid crystal panel 20 according to the first control signal.
S400, the liquid crystal panel 20 displays a screen according to the first image quality table.
Specifically, first, the main control module 100 detects an input picture, and simultaneously determines whether the picture is a heavy-load picture:
if the screen is detected to be the loaded screen, the main control module 100 outputs a first control signal to the voltage switching module 200, and outputs the first image quality table to the liquid crystal panel 20; then, the voltage switching module 200 outputs the first voltage to the liquid crystal panel 20 according to the first control signal; finally, the liquid crystal panel 20 displays a screen according to the first image quality table, thereby displaying a normal reloading screen.
According to the utility model, through the detection of the main control module 100 on the heavy-load picture, when the heavy-load picture is detected to be loaded, the main control module 100 outputs the first picture quality table corresponding to the first voltage to the liquid crystal panel 20, and controls the voltage switching module 200 to output the first voltage to the liquid crystal panel 20, and finally controls the liquid crystal panel 20 to display the picture according to the first picture quality table, so that the heavy-load picture is normally displayed, the COF temperature under the heavy-load picture is effectively reduced, and the problem of abnormal picture display of the liquid crystal panel 20 and even the problem of burning of the COF IC caused by the over-temperature COF are further improved.
Further, referring to fig. 11, when the frame is detected as the loaded frame, the step of outputting the first control signal to the voltage switching module 200 by the main control module 100 and outputting the first image quality table to the liquid crystal panel 20 includes:
s210, when the main control module 100 detects that the picture is the heavy-load picture, the main control module 100 outputs the first control signal to a first MOS transistor M1 and a second MOS transistor M2;
s220, the first MOS transistor M1 and the second MOS transistor M2 generate a first voltage selection signal to a first voltage partition memory Bank A according to the first control signal;
s230, the first voltage partition memory Bank a outputs the first voltage to the liquid crystal panel 20 according to the first voltage selection signal.
Specifically, first, the main control module 100 detects an input picture, and simultaneously determines whether the picture is a heavy-load picture:
if the heavy-load picture is detected, the main control module 100 outputs a first control signal to the first MOS transistor M1 and the second MOS transistor M2; then, the first MOS transistor M1 and the second MOS transistor M2 generate a first voltage selection signal to a first voltage partition memory Bank a according to the first control signal; then, the first voltage partition memory Bank a outputs the first voltage to the liquid crystal panel 20 according to the first voltage selection signal; finally, the SOC or TCON controls the liquid crystal panel 20 to display the normal reloading screen according to the first image quality table.
If the heavy-load picture is detected, similarly, the main control module 100 outputs a second control signal to the first MOS transistor M1 and the second MOS transistor M2; then, the first MOS transistor M1 and the second MOS transistor M2 generate a second voltage selection signal to a second voltage partition memory Bank B according to the second control signal; then, the second voltage partition memory Bank B outputs the second voltage to the liquid crystal panel 20 according to the second voltage selection signal; finally, the SOC or TCON controls the liquid crystal panel 20 to display the normal reloading screen according to the second image quality table.
Further, referring to fig. 12, after the step of detecting the input frame by the main control module 100 and determining whether the frame is the reloading frame, the method further includes:
s500, when the frame is detected to be the non-reloading frame, the main control module 100 outputs a second control signal to the voltage switching module 200, and outputs the second image quality table to the liquid crystal panel 20.
S600, the voltage switching module 200 outputs the second voltage to the liquid crystal panel 20 according to the second control signal.
S700, the liquid crystal panel 20 displays a screen according to the second image quality table.
Specifically, first, the main control module 100 detects an input picture, and simultaneously determines whether the picture is a heavy-load picture:
if the non-reloading picture is detected, similarly, the main control module 100 outputs a second control signal to the voltage switching module 200, and outputs the second image quality table to the liquid crystal panel 20; then, the voltage switching module 200 outputs the second voltage to the liquid crystal panel 20 according to the second control signal; finally, the liquid crystal panel 20 displays a screen according to the second image quality table, thereby displaying a normal non-reloading screen.
According to the utility model, through the detection of the main control module 100 on the heavy-load picture, when a non-heavy-load picture is detected to be loaded, the main control module 100 outputs a second picture quality table corresponding to the second voltage to the liquid crystal panel 20, and controls the voltage switching module 200 to output the second voltage to the liquid crystal panel 20, and finally controls the liquid crystal panel 20 to display the picture according to the second picture quality table, so that the non-heavy-load picture is normally displayed, and the control of outputting the default first voltage and calling the second picture quality table corresponding to the second voltage when the non-heavy-load picture is loaded is realized, so that the normal display of the heavy-load non-heavy-load picture is not influenced.
Further, the utility model also provides COF temperature control terminal equipment, which comprises a PCB board, wherein the PCB board is provided with the COF temperature control circuit; since the detailed description of the COF temperature control circuit is given above, it is not described herein again.
In summary, the present invention provides a COF temperature control circuit, a driving method and a terminal device, wherein the COF temperature control circuit is connected to a liquid crystal panel, and the COF temperature control circuit includes: the main control module is used for generating a first control signal to the voltage switching module and outputting a first image quality table to the liquid crystal panel when detecting that the input picture is a heavy-load picture, and generating a second control signal to the voltage switching module and outputting a second image quality table to the liquid crystal panel when detecting that the input picture is a non-heavy-load picture; the voltage switching module is used for respectively outputting a first voltage and a second voltage to the liquid crystal panel according to the first control signal and the second control signal. When the input picture is detected to be the heavy-load picture, the main control module outputs a corresponding picture quality table to the liquid crystal panel, and the voltage switching module is controlled to output the first voltage to the liquid crystal panel, so that the temperature of the liquid crystal panel during picture display is regulated and controlled, and the problems of abnormal display of the liquid crystal panel and burning of COF IC are effectively solved. It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.

Claims (10)

1. A COF temperature control circuit connected to a liquid crystal panel, comprising: the device comprises a main control module and a voltage switching module; the main control module is respectively connected with the liquid crystal panel and the voltage switching module, and the voltage switching module is also connected with the liquid crystal panel; the main control module is used for generating a first control signal to the voltage switching module and outputting a first image quality table to the liquid crystal panel when detecting that an input picture is a heavy-load picture, and generating a second control signal to the voltage switching module and outputting a second image quality table to the liquid crystal panel when detecting that the input picture is a non-heavy-load picture; the voltage switching module is used for respectively outputting a first voltage and a second voltage to the liquid crystal panel according to the first control signal and the second control signal.
2. The COF temperature control circuit of claim 1, wherein the voltage switching module comprises: a switching unit and a voltage output unit; the switch unit is respectively connected with the main control module and the voltage output unit; the voltage output unit is also connected with the liquid crystal panel; the switch unit is used for correspondingly generating a first voltage selection signal and a second voltage selection signal according to the first control signal and the second control signal respectively and sending the first voltage selection signal and the second voltage selection signal to the voltage output unit; the voltage output unit is used for correspondingly and respectively outputting the first voltage and the second voltage to the liquid crystal panel according to the first voltage selection signal and the second voltage selection signal.
3. The COF temperature control circuit of claim 1, wherein the master module comprises: a control unit and an image quality table switching unit; the control unit is connected with the voltage switching module, and the image quality table switching unit is connected with the liquid crystal panel; the control unit is configured to output the first control signal and the second control signal to the voltage switching module, and the image quality table switching unit is configured to output the first image quality table to the liquid crystal panel when detecting that the picture is the heavy-load picture, and output the second image quality table to the liquid crystal panel when detecting that the picture is the non-heavy-load picture.
4. The COF temperature control circuit according to claim 2, wherein the switching unit comprises: the power supply comprises a first MOS tube, a second MOS tube and a power supply pin; the source electrodes of the first MOS tube and the second MOS tube are connected with the voltage output unit; the grids of the first MOS tube and the second MOS tube are connected with the main control module; and the drain electrodes of the first MOS tube and the second MOS tube are connected with a power supply pin.
5. The COF temperature control circuit of claim 4, wherein the voltage output unit comprises: a first voltage partition memory and a second voltage partition memory; the first voltage partition memory is respectively connected with the source electrode of the first MOS tube and the liquid crystal panel; the second voltage partition memory is respectively connected with the source electrode of the second MOS tube and the liquid crystal panel; the first voltage partition memory is used for storing the first voltage; the second voltage partition memory is used for storing the second voltage.
6. The COF temperature control circuit according to claim 3, wherein the image quality table switching unit comprises: a first picture quality table memory and a second picture quality table memory; the first image quality table memory and the second image quality table memory are both connected with the liquid crystal panel.
7. A COF temperature control method based on the COF temperature control circuit of claim 5, wherein the COF temperature control method comprises the steps of:
the main control module detects an input picture and judges whether the picture is the reloading picture or not;
when the picture is detected to be the heavy-load picture, the main control module outputs the first control signal to the voltage switching module and outputs the first picture quality table to the liquid crystal panel;
the voltage switching module outputs the first voltage to the liquid crystal panel according to the first control signal;
and the liquid crystal panel displays a picture according to the first picture quality table.
8. The method of claim 7, wherein the step of outputting the first control signal to the voltage switching module and outputting the first image quality table to the liquid crystal panel when the picture is detected as the loaded picture by the main control module comprises:
when the main control module detects that the picture is the heavy load picture, the main control module outputs the first control signal to a first MOS tube and a second MOS tube;
the first MOS tube and the second MOS tube generate a first voltage selection signal to a first voltage partition memory according to the first control signal;
the first voltage partition memory outputs the first voltage to the liquid crystal panel according to the first voltage selection signal.
9. The method of claim 7, wherein the step of the master module detecting an input frame and determining whether the frame is the reloading frame further comprises:
when the picture is detected to be the non-load picture, the main control module outputs the second control signal to the voltage switching module, and simultaneously outputs the second picture quality table to the liquid crystal panel;
the voltage switching module outputs the second voltage to the liquid crystal panel according to the second control signal;
and the liquid crystal panel displays the picture according to the second picture quality table.
10. A COF temperature control terminal device comprising a PCB board, wherein the PCB board is provided with the COF temperature control circuit according to any one of claims 1 to 6.
CN202111553513.1A 2021-12-17 2021-12-17 COF temperature control circuit, driving method and terminal equipment Active CN114242014B (en)

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