CN111696470A - Display module and display device - Google Patents
Display module and display device Download PDFInfo
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- CN111696470A CN111696470A CN202010664311.3A CN202010664311A CN111696470A CN 111696470 A CN111696470 A CN 111696470A CN 202010664311 A CN202010664311 A CN 202010664311A CN 111696470 A CN111696470 A CN 111696470A
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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
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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
- G09G3/22—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 using controlled light sources
- G09G3/30—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 using controlled light sources using electroluminescent panels
- G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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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
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
Abstract
The application discloses display module assembly and display device, this display module assembly includes: the display panel, the main driving chip and at least one slave driving chip, wherein the slave driving chip is communicated with the main driving chip; the master driving chip is used for transmitting a plurality of binding voltage values to the slave driving chip, and the binding voltage values are determined by the optical data of the display panel acquired by the master driving chip. The embodiment of the application transmits each binding voltage determined by the optical data of the main driving chip to the slave driving chip, so that each slave driving chip can utilize the obtained accurate binding voltage value to lock the binding point, and further all the driving chips in the display module output consistent gamma voltages, thereby avoiding the split-screen display caused by the difference of the gamma voltages of different driving chips and improving the display quality.
Description
Technical Field
The present disclosure relates to display technologies, and particularly to a display module and a display device.
Background
With the continuous development of display technologies, as a new generation of display technologies, the OLED product has become a mainstream high-end product sought by customers due to the characteristics of high transmittance, ultra-light and thinness, high definition, high brightness, high contrast, quick response, low energy consumption, realization of flexible display, and the like. While the OLED display module has been widely applied to small-sized products such as mobile phones, the demand for large-sized products is increasing.
For a large-size display module, due to the addition of a driving chip (source IC), the difference of the characteristics of each driving chip easily causes a screen splitting phenomenon in the display process, resulting in poor display effect and poor user experience.
Disclosure of Invention
In view of the above-mentioned defects or shortcomings in the prior art, it is desirable to provide a display module and a display panel, in which one of the driving chips is used as a master chip to uniformly transmit the precise binding voltage value determined by the master chip to other slave chips, so that all the driving chips can output uniform gamma voltages to improve display quality.
In a first aspect, an embodiment of the present application provides a display module, including:
the display panel is respectively connected with the main driving chip and the slave driving chip;
the slave driving chip is communicated with the master driving chip;
the master driving chip is used for transmitting a plurality of binding voltage values to the slave driving chip, and the binding voltage values are determined by the optical data of the display panel acquired by the master driving chip.
Optionally, an embodiment of the present application provides a display module, where the slave driving chip and the active driving chip are in bus communication through an IC 2.
The embodiment of the application provides a display module, still includes the circuit board, should be provided with respectively from driver chip and this initiative driver chip and cause two at least reference voltage input lines, this reference voltage input line is used for to should be correspondingly from driver chip and initiative driver chip input reference voltage.
The embodiment of the application provides a display module, and the reference voltage input line comprises a first reference voltage input line and a second reference voltage input line, wherein the first reference voltage input line is used for inputting the maximum voltage, and the second reference voltage input line is used for inputting the minimum voltage.
The embodiment of the application provides a display module, and the reference voltage input lines corresponding to the slave drive chip and the active drive chip comprise 13 set reference voltage input lines.
The embodiment of the application provides a display module assembly, and this display module assembly still includes optical probe, and this optical probe sets up the central point at this display panel for survey this display panel's optical data, wherein, this main drive chip is located the intermediate position of this display panel side reason.
The embodiment of the application provides a display module, further comprising a first circuit board, wherein the reference voltage trace and the IC2 bus are disposed on the first circuit board.
In a second aspect, an embodiment of the present application provides a display panel, including the display module of the first aspect.
To sum up, the display module assembly and display device that this application embodiment provided, through set up a main drive chip in the display module assembly, and at least one from drive chip, make all from drive chip and main drive chip be connected, thereby can utilize main drive chip will come the accurate each voltage transmission of binding that confirms through self optical data to give from drive chip, make each from drive chip can utilize the accurate voltage value of binding that obtains to bind the locking of point, and then make all drive chips in the display module assembly export unanimous gamma voltage, avoid because the split screen that the difference of the gamma voltage of different drive chips leads to shows the quality.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 is a schematic structural diagram of a display module according to an embodiment of the present application;
FIG. 2 is a schematic diagram illustrating brightness and gray scale in accordance with an embodiment of the present application;
FIG. 3 is a schematic diagram of a reference voltage input line according to another embodiment of the present application;
fig. 4 is a schematic structural diagram of a display module according to another embodiment of the present application.
Description of reference numerals:
01-display panel, 02-master driver chip, 03-slave driver chip, 04-IC2 bus, 05-reference voltage input line, 051-first reference voltage input line, 052-second reference voltage input line, 06-first circuit board, 07-second circuit board, 08-optical probe.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
It is understood that in the field of display technology, for medium and large size display, the driving of the display panel needs to be realized by a plurality of driving chips (Source ICs). For example, a typical mobile phone product only needs one Source IC to realize driving. For a 14 inch UHD with large size, 6 Source ICs are needed to realize driving.
It can be understood that, during the display process, the relationship between the brightness (Luminance) and the gray scale (gray) Gamma2.2 needs to be satisfied, as shown in fig. 2, that is, the Gamma voltage is an important factor for ensuring the display effect of the display panel.
In order to ensure that the display images of the entire display panel are consistent, all the driving chips are required to output consistent gamma voltages to ensure the display effect.
The Gamma voltage in the driving chip is presented in the form of a resistor string, and correspondingly, according to the characteristics of the resistor string, a commonly used Gamma voltage debugging mode is to determine a plurality of binding points by adopting gray voltages corresponding to a plurality of gray levels and the resistance value of the resistor string through a determined Gamma voltage range. The binding voltage corresponding to each binding point is determined. For example, 20 binding points, such as 255 Gamma, 205gray, …, 15gray, 1gray, and 0gray Gamma binding points, may be predefined, and then a corresponding Gamma voltage value may be determined according to a plurality of binding point voltage values and voltage ranges, such as the Gamma voltage between a binding point and a binding point may be obtained by linear interpolation.
In an actual middle-large-sized panel, in order to enable all the driving chips to output consistent gamma voltages, and in order to reduce the adjustment time (take time) and cost of production, binding voltage values corresponding to a plurality of gray scales are locked in advance through data acquisition of optical characteristics of a certain driving chip, and a look-up table (look-up table) is established.
When the display module is powered on each time, the binding voltage of each driving chip is correspondingly locked by a plurality of reference voltages input by an external circuit and the binding voltage value searched from a predetermined lookup table (look up table) so as to select the output voltage value of each gray scale. For example, all the driving chips are subjected to locking reference of 20 binding voltages by giving 13 reference voltages by an external circuit.
It can be understood that the 13 reference voltages given externally are to eliminate the error of the actual resistance value between the Gamma resistor strings due to the manufacturing process error between different driving chips. That is, the Gamma reference voltages provided by the 13 external circuits are used to fix the voltage of the resistor string in the driving chip so as to prevent the Gamma voltages from being inconsistent.
In the process that each driving chip is uniformly bound through the lookup table which is uniformly established in advance, even if the values of the lookup tables are the same, the resistance values of the resistor strings are slightly different due to manufacturing process errors, so that after the binding point is locked, the actually separated voltage values are also different, the gray scale voltage output by each driving chip is different, and the picture is divided into screens.
In addition, the binding voltage lookup tables in all the driver chips are established in advance by optically acquiring the display effect of a certain driver chip by using an optical probe. Due to the influence of the process difference, the characteristics of each display module are different, so that the real binding voltage of each display module is different, the binding is uniformly carried out by adopting a binding voltage lookup table established in advance, and the deviation of the actual Gamma voltage may exist.
Moreover, even if the binding voltage in the uniformly distributed binding voltage lookup table is close to the true value of each driving chip, when binding voltage locking is performed by using reference voltage given by an external circuit, due to the difference of the resistance values of the resistor strings of each driving chip and the difference of converting digital signals of the external circuit into analog signals, the locking result has deviation, so that the output Gamma voltages of each driving chip are different, and split screen display in the display process is caused.
The display module provided in the embodiment of the application is to solve the problem that in the prior art, due to the fact that a uniform binding voltage lookup table is used, the binding voltage found by each driving chip in the large-size display module is approximate, and the Gamma voltage difference generated when the binding voltage is locked by using the reference voltage input by the external circuit and the found approximate value, by setting one main driving chip and the other driving chips as slave driving chips and communicating the main driving chip with the other slave driving chips through a bus, the binding voltage determined by the main driving chip is directly transmitted to each slave driving chip through the bus, so that the driving chips can realize the locking of binding points according to the accurate binding voltage, all the driving chips can output consistent Gamma voltages, and the display effect is improved.
For better understanding and explanation, the display module and the display device provided in the embodiments of the present application are explained in detail below with reference to fig. 1 to 4.
Fig. 1 is a schematic structural diagram of a display module according to an embodiment of the present application, and as shown in fig. 1, the display module includes:
the display panel comprises a display panel 01, a main driving chip 02 and at least one auxiliary driving chip 03, wherein the display panel is respectively connected with the main driving chip and the auxiliary driving chip;
the slave driving chip is communicated with the master driving chip;
the master driving chip is used for transmitting a plurality of binding voltage values to the slave driving chip, and the binding voltage values are determined by the optical data of the display panel acquired by the master driving chip.
Specifically, the display module may include a display panel for displaying a picture, and a driving chip disposed at a periphery of the display panel, where the driving chip is connected to the display panel, for example, may be specifically connected to a driving circuit of the display panel.
The display panel may be an LCD or an OLED, which is not limited in this embodiment.
The driver chip may include a master driver chip, and at least one slave driver chip, where the master driver chip is in communication with one or more than one driver chips to transmit the binding voltage value to one or more than one driver chips.
For example, as shown in fig. 1, the master driving chip and the at least one slave driving chip may be disposed on one side of the display panel, which is not limited in this embodiment of the present application.
It is understood that when the display module includes two or more slave driving chips, the master driving chip may be disposed at a middle position of the side edge of the display panel or a position near the middle, so that each binding voltage value is determined by collecting optical data of the master driving chip at the middle position of the display surface.
For example, the display module further includes an optical probe 08 disposed at a center of the display panel for detecting optical data of the display panel. Correspondingly, the main driving chip is positioned in the middle of the side edge of the display panel, so that the optical data collected by the optical probe is input into the main driving chip.
Wherein the transmitted binding voltage value is determined by the main driving chip.
For example, the display module shown in fig. 1 includes an active driving chip IC3, and five slave driving chips IC1, IC2, IC4, IC5 and IC 6. The active driver chip IC3 communicates with the other slave driver chips to transmit the determined value of the tie voltage to each driver chip.
In practice, the optical probe may be used to collect the optical data of the IC3 of the main driver chip, and then the picture data and the resistor string are bound according to a required gamma curve, such as a gamma curve of 2.2 as shown in fig. 2, so as to select the output voltage value of each gray scale, that is, determine each binding voltage value, for example, determine 20 binding voltage values.
It can be understood that after other slave driver chips receive the accurate binding voltage value transmitted by the master driver chip, the binding locking can be respectively carried out according to the characteristic of the resistor string of the slave driver chips and the reference voltage input by the external circuit, so as to determine the consistent binding voltage from the master driver chip.
For example, for the data streams such as 255garay, 205 gray. . . 15gray, 1gray and 0gray gamma, all the slave driver chips can find the respective binding point position according to the accurate voltage value corresponding to each binding point received, so as to output the gamma voltage value corresponding to the accurate voltage value received.
In the large-size display module assembly that this application embodiment provided, through set up a main drive chip in the display module assembly, and at least one from the drive chip, make all from the drive chip with main drive chip is connected, thereby can utilize the main drive chip will come the accurate each voltage transmission of binding that confirms through the optical data of self to give from the drive chip, make each from the drive chip can utilize the accurate voltage value of binding that obtains to carry out the locking of binding point, and then make all drive chips in the display module assembly output unanimous gamma voltage, avoid the split screen display that leads to because the difference of the gamma voltage of different drive chips, display quality has been improved.
Optionally, in another embodiment, the display module may further include a first circuit board 06 and a second circuit board 07, the first circuit board may be a Flexible Printed Circuit (FPC), and the second circuit board may be a Printed Circuit Board (PCB).
As shown in fig. 3, the circuit board PCB and the driving chip may be disposed at the same side of the display panel, and the flexible circuit board FPC may be disposed between the driving chip and the circuit board PCB.
For example, in one scenario, the circuit board PCB may be disposed on the back side of the display panel in order to reduce the bezel size of the display module.
Optionally, in order to reduce the process complexity and reduce the number of traces, the active chip and the slave driver chip may be connected through the IC2 bus 04.
As shown in fig. 1, an IC2 bus may be provided on the FPC between the circuit board PCB and the driver chip.
The master driver chip may communicate with each slave driver chip via the IC2 bus, i.e., by collecting optical data from the optical probe disposed at the corresponding display location of the master driver chip to determine each binding voltage. And then, each binding voltage determined by the master driver chip according to the optical data of the master driver chip can be transmitted to each slave driver chip through the IC2 bus, so that each slave driver chip can acquire an accurate binding voltage value without acquiring an approximate binding voltage value from an external circuit through a lookup table.
It can be understood that, when the master driver chip communicates with each slave driver chip through the bus of the IC2, each of the driver chips, i.e., the master driver chip and each of the slave driver chips, is connected to the bus of the IC2 by providing two wires, so as to reduce the number of wires.
Furthermore, in the actual production process, the voltage of the resistor string in each Source IC is usually fixed by the reference voltage provided by the external circuit, i.e. the voltage range, that is, on the FPC between the circuit board PCB and the driver chip, no matter the driver chip is a master driver chip or a slave driver chip, each driver chip is correspondingly provided with a plurality of respective reference voltage input lines, so that the external circuit can input the reference voltage through the reference voltage input line 05 of each driver chip.
Each reference voltage input line is connected with a pin of the second circuit board.
For example, as shown in fig. 3, in one embodiment, a bus of 13 reference voltages may be configured for each driver chip, so that when looking for a binding voltage, 13 reference voltages with different sizes may be input to the driver chip through an external circuit.
For example, the lowest reference voltages Gamma1, Gamma2, Gamma3, Gamma4, Gamma5, etc. and the highest reference voltage Gamma13 are included.
It can be understood that when a plurality of reference voltage input lines are arranged on each driving chip in the display module, as shown in fig. 3, 13 reference voltages are provided by each driving chip for 6 driving chips, which increases the difficulty for Layout of the PCB and the FPC, and increases the sizes of the PCB and the FPC, thereby increasing the frame of the middle-size display module and affecting the user experience.
In addition, each driver chip has 13 reference voltages, which increases the number of pins in the Bonding region, thereby causing the Pitch (Pitch) of the Bonding region to be greatly reduced. Accordingly, the reduction of the pitch will increase the difficulty of the factory Bonding process, resulting in a severe reduction of the production yield.
Further, according to the embodiment of the application, on the basis of bus connection, in order to further reduce the process difficulty and reduce the number of pins in a Bonding area, 13 reference voltage input lines of each driving chip are reduced to two, that is, only the input lines of the highest reference voltage and the lowest reference voltage are reserved, that is, the first reference voltage input line 051 and the second reference input line 052 are led out from each driving chip.
As shown in fig. 1, only the lowermost reference voltage input line 051 and the uppermost reference voltage input line 052 are provided.
It can be understood that, in this application example, after the reference voltage input lines are reduced, if the reference voltage input lines of each driver chip are changed from 13 to 2, and the two routing lines of each driver chip IC2 bus are combined, the routing lines of each driver chip are reduced from 13 to 4, so that the size and routing difficulty of the PCB and the FPC are greatly reduced, and more spaces are provided for the narrow frame design.
In addition, after 13 original reference voltage input lines are reduced to 4 existing wiring lines, the Bonding Pitch of the PCB and the FPC can be increased, so that the Bonding process difficulty of a factory is reduced, and the yield and the manufacturing time are improved.
On the other hand, the embodiment of the application also provides a display device, and the display device comprises the display module.
To sum up, the display module assembly and display device that this application embodiment provided, through set up a main drive chip in the display module assembly, and at least one from drive chip, make all from drive chip and main drive chip be connected, thereby can utilize main drive chip will come the accurate each voltage transmission of binding that confirms through self optical data to give from drive chip, make each from drive chip can utilize the accurate voltage value of binding that obtains to bind the locking of point, and then make all drive chips in the display module assembly export unanimous gamma voltage, avoid because the split screen that the difference of the gamma voltage of different drive chips leads to shows the quality.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (8)
1. A display module, comprising:
the display device comprises a display panel, a main driving chip and at least one auxiliary driving chip, wherein the main driving chip and the auxiliary driving chip are connected with the display panel;
the slave driving chip is communicated with the master driving chip;
the master drive chip is used for transmitting a plurality of binding voltage values to the slave drive chip, and the binding voltage values are determined by the optical data of the display panel acquired by the master drive chip.
2. The display module as claimed in claim 1, wherein the slave driver chip and the active driver chip are in bus communication via an IC 2.
3. The display module as claimed in claim 2, wherein the slave driver chip and the active driver chip are each provided with at least two reference voltage input lines for inputting reference voltages to the corresponding slave driver chip and the active driver chip.
4. The display module of claim 3, wherein the reference voltage input lines of the slave driver chip and the active driver chip each comprise a first reference voltage input line for inputting a highest voltage and a second reference voltage input line for inputting a lowest voltage.
5. The display module as claimed in claim 3, wherein the reference voltage input lines corresponding to the slave driving chip and the active driving chip comprise 13 reference voltage input lines.
6. The display module according to claim 4, further comprising an optical probe disposed at a center of the display panel for detecting optical data of the display panel, wherein the main driving chip is located at a middle position of a side edge of the display panel.
7. The display module according to any one of claims 3-6, wherein the display module further comprises a first circuit board disposed on a side of the display panel, the reference voltage input line and the IC2 bus being disposed on the first circuit board.
8. A display device, comprising the display module according to any one of claims 1 to 7.
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| CN202010664311.3A CN111696470A (en) | 2020-07-10 | 2020-07-10 | Display module and display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112469163A (en) * | 2020-12-15 | 2021-03-09 | 固高科技(深圳)有限公司 | Drive chip set, drive device and drive system |
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