CN111415617B - Method for increasing gamma voltage stabilization time of OLED panel by adding latch - Google Patents
Method for increasing gamma voltage stabilization time of OLED panel by adding latch Download PDFInfo
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- CN111415617B CN111415617B CN202010255959.5A CN202010255959A CN111415617B CN 111415617 B CN111415617 B CN 111415617B CN 202010255959 A CN202010255959 A CN 202010255959A CN 111415617 B CN111415617 B CN 111415617B
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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]
- G09G3/3225—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] using an active matrix
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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]
- G09G3/3275—Details of drivers for data electrodes
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Electroluminescent Light Sources (AREA)
- Picture Signal Circuits (AREA)
Abstract
The invention relates to a method for improving gamma voltage stabilization time of an OLED panel by adding a latch, wherein a driving chip of the OLED panel comprises the latch, a gamma voltage block, a decoder and a channel amplifier, particularly, the latch comprises a PCLK latch, an SLACH latch and a TLATCH latch, the TLATCH latch is activated in the range from the current activation of the SLACH latch to the next activation of the SLACH latch, and the gamma voltage block and the channel amplifier work normally after the TLATCH latch is activated. The PCLK latch is a first layer latch, the SLACH latch is a second layer latch, and the TLATCH latch is a third layer latch. The invention adds TLATCH latch, and effectively lengthens the gamma stable time and the setting time of the channel amplifier.
Description
Technical Field
The invention relates to the technical field of improving the gamma voltage stabilization time of an OLED panel, in particular to a method for improving the gamma voltage stabilization time of the OLED panel by adding a latch.
Background
In recent years, the screen resolution has been gradually improved, and QHD-plus and FHD-plus require 21:9 or 21:10 screens. And, due to the effect of folding the handset, the resolution is getting larger and larger. For example, QHD +:1440RGB x3360 (screen resolution 1440 x3360 of QHD +); QXGA +:1600RGBx3360 ((screen resolution 1600 x3360 of QXGA +)), FHD +:1080RGBx2520 (screen resolution 1080 x2520 of FHD +), UXGA +:1200RGBx2520 (screen resolution 1200 x2520 of UXGA +). with the increase of screen resolution, the progress of communication technology requires AR or VR applications to increase operations of 90Hz and 120Hz instead of the conventional 60Hz operation, and the 5G communication era comes due to the increase of data transmission rate.
From the viewpoint of OLED driving chip design, the screen resolution is higher and higher, and the absolute time for driving the panel is continuously reduced. Due to the increase of the source channel, it is required to improve the gamma voltage settling time which most affects the panel operation and the display quality.
FIG. 1 shows a schematic block diagram of the internal circuit of the OLED panel driving chip corresponding to 1440 RGGX 3360 of QHD +21: 9. It consists of a latch (latch) based on 720RGBG rendering, an R/G/B gamma voltage block (gamma), a 720RGBG Decoder (Decoder) and a channel Amplifier (AMP). The output of the latch and the output of the R/G/B gamma voltage block combine to drive a decoder and a channel amplifier. The decoder and channel amplifier driven by the R/G/B gamma voltage block are very heavily loaded and have 720 channel loading. As the resolution increases, the loads of the decoder and the channel amplifier increase proportionally, thereby increasing the gamma voltage settling time.
Conventional latch structures as shown in fig. 4, the latch is a dual-stack latch structure, and the latch generally consists of two layers of latches, including PCLK latch of the first layer and SLATCH latch of the second layer. The PCLK latch is a pixel clock latch and the SLACH latch is a line latch.
The driving timing and the source block operation timing of the OLED panel driving chip using the conventional latch structure of fig. 4 are as shown in fig. 2, and the resolution is 21 of QHD-plus: 1440RGBX3360 of 9, the frame frequency is 90 Hz. The scan driver runs on two phased clocks GCK1 and GCK2, EM being the emission drive, SOUT1, SOUT2 being the source outputs. The OLED panel is divided into a Source changing state (Source changing), a Programming state (Programming) and an excitation state (Emission).
In detail, as in fig. 2, G1 is a single line time of 3.26 us. During G1, the OLED panel is charged and the charged voltage is stored in a capacitor. With the conventional dual stack latch structure of fig. 4, the SLATCH latch is activated after the PCLK latch has completed transferring all pixel data of a group. The gamma voltage block and the channel amplifier can normally work after the SLACH latch is activated. The SLATCH latch will not be activated during the time when the PCLK latch is not transferring all pixel data of a group to completion. The SLACH latch is activated within the range from the end of the current set of data transfer to the beginning of the next set of data transfer of the PCLK latch, and therefore, the range of activation of the SLACH latch is very narrow. Since the PCLK latch has not yet completed all pixel data transfers of a group when the OLED panel enters the programmed state, the SLATCH latch cannot operate when the OLED panel enters the programmed state. When the SLATCH latch is activated, the OLED panel may still be in an initialized state and not enter a programming state, the setup time (Channel Amplifier) and the Gamma Stabilization time (Gamma Stabilization time) of the Channel Amplifier are limited by the SLATCH latch, and both the Gamma Stabilization time and the setup time of the Channel Amplifier are narrow.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method for improving the gamma voltage stabilization time of the OLED panel by adding the latch can improve the gamma voltage stabilization time of the OLED panel.
The technical scheme includes that a method for increasing a latch to improve the gamma voltage stabilization time of an OLED panel is adopted, a driving chip of the OLED panel comprises the latch, a gamma voltage block, a decoder and a channel amplifier, particularly, the latch comprises a PCLK latch, an SLACH latch and a TLATCH latch, the TLATCH latch is activated in the range from the current activation of the SLACH latch to the next activation of the SLACH latch, and the gamma voltage block and the channel amplifier work normally after the TLATCH latch is activated.
Preferably, the latch is a three-stack latch structure.
The PCLK latch is a pixel clock latch and is used for synchronous output of pixel data; the PCLK latch is a first layer latch.
The SLACH latch is a line latch, and the SLACH latch is activated after the PCLK latch outputs all pixel data of one group; the SLACH latch is a second layer latch.
The TLATCH latch is a third layer latch.
More preferably, the TLATCH latch comprises a TLATCH1 latch and a TLATCH2 latch, the TLATCH1 latch is activated in a range from the current activation of the SLATCH latch to the next activation of the SLATCH latch, the TLATCH2 latch is activated in a range from the current activation of the SLATCH latch to the next activation of the SLATCH latch, and the TLATCH1 latch and/or the TLATCH2 latch are/is activated to enable the gamma voltage block and the channel amplifier to work normally.
The invention has the beneficial effects that: the activation range of the TLATCH latch is wide, so that the TLATCH latch can be activated and operated when the PCLK latch does not finish synchronously transmitting all pixel data of one group. The invention adds the TLATCH latch, and although the area of the driving chip is slightly increased, the gamma stability time and the setting time of the channel amplifier can be effectively prolonged.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic block diagram of the internal circuitry of a conventional OLED panel driver chip;
fig. 2 is a driving timing and a source block operation timing of an OLED panel driving chip employing a conventional latch structure;
FIG. 3 is a driving timing and source block operation timing of an OLED panel driving chip employing the improved latch structure of the present invention;
FIG. 4 is a conventional dual stack latch structure;
fig. 5 is an improved three-stack latch structure of the present invention.
Detailed Description
The invention will now be further described with reference to the accompanying drawings. These drawings are simplified schematic diagrams only illustrating the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
In a preferred embodiment, a method for increasing a latch to improve a gamma voltage stabilization time of an OLED panel includes that a driving chip of the OLED panel includes a latch, a gamma voltage block, a decoder, and a channel amplifier, where the latch includes a PCLK latch, an SLATCH latch, and a TLATCH latch, the TLATCH latch is activated in a range from a current activation of the SLATCH latch to a next activation of the SLATCH latch, and the TLATCH latch enables the gamma voltage block and the channel amplifier to normally operate after being activated.
As shown in fig. 5, the latch is a three-stack latch structure; the PCLK latch is a pixel clock latch and is used for synchronous output of pixel data; the PCLK latch is a first layer latch. The SLACH latch is a line latch, and the SLACH latch is activated after the PCLK latch outputs all pixel data in one group; the SLACH latch is a second-layer latch; the TLATCH latch is a third layer latch.
The TLATCH latch includes a TLATCH1 latch and a TLATCH2 latch, the TLATCH1 latch is activated in the range from the current activation of the SLATCH latch to the next activation of the SLATCH latch, and the TLATCH2 latch is activated in the range from the current activation of the SLATCH latch to the next activation of the SLATCH latch.
Because the TLATCH latch is activated in the range from the current activation of the SLATCH latch to the next activation of the SLATCH latch, the selectable range of activation of the TLATCH latch is wide, and therefore the TLATCH latch can also be activated to operate when the PCLK latch does not complete the synchronized transfer of all pixel data of a group.
The driving timing and the source block operation timing of the OLED panel driving chip using the three-stack latch structure of fig. 5 are shown in fig. 3, and similarly, the resolution is 21 of QHD-plus: 1440RGBX3360 of 9, the frame frequency is 90 Hz. The scan driver runs on two phased clocks GCK1 and GCK2, EM being the emission drive, SOUT1, SOUT2 being the source outputs. The OLED panel is divided into a Source changing state (Source changing), a Programming state (Programming) and an excitation state (Emission).
In detail, as in fig. 3, G1 is a single line time of 3.26 us. During G1, the channel amplifier charges the OLED panel and stores the charged voltage in a capacitor. After the PCLK latch completes the transfer of all the pixel data in a group, the SLATCH latch is activated. The TLATCH1 latch activates in the range from the current activation of the SLATCH latch to the next activation of the SLATCH latch, and the TLATCH2 latch activates in the range from the current activation of the SLATCH latch to the next activation of the SLATCH latch. The selectable range of activation of the TLATCH1 latch, TLATCH2 latch is wide.
The TLATCH1 latch and the TLATCH2 latch enable the gamma voltage block and the channel amplifier to operate normally when activated. Because the range of the SLATCH latch currently active to the next activation of the SLATCH latch is wide, the selectable range of activation of the TLATCH1 latch, TLATCH2 latch is also large. When the OLED panel enters a programming state, although the PCLK latch does not complete the data transmission of all pixels of one group, the TLATCH1 latch and the TLATCH2 latch can still be activated to operate, the setting time (Channel Amplifier) and the Gamma stabilizing time (Gamma stabilizing time) of the Channel Amplifier are not limited by the SLATCH latch any more, and the Gamma stabilizing time and the setting time of the Channel Amplifier are both longer than the conventional one.
The invention adds the TLATCH latch, and although the area of the driving chip is slightly increased, the gamma stabilizing time and the setting time of the channel amplifier can be effectively prolonged.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (2)
1. A method for increasing the gamma voltage stabilization time of an OLED panel by adding a latch, wherein a driving chip of the OLED panel comprises the latch, a gamma voltage block, a decoder and a channel amplifier, and is characterized in that: the latch comprises a PCLK latch, an SLACH latch and a TLATCH latch, the latch is in a three-stack latch structure, and the PCLK latch is a pixel clock latch and is used for synchronous output of pixel data; the PCLK latch is a first layer latch;
the SLACH latch is a line latch, and the SLACH latch is activated after the PCLK latch outputs all pixel data of one group; the SLACH latch is a second-layer latch;
the TLATCH latch is a third layer latch; the TLATCH latch is activated in the range from the current activation of the SLATCH latch to the next activation of the SLATCH latch, and the TLATCH latch can also be activated to operate when the PCLK latch does not synchronously transmit all pixel data of one group;
and after the TLATCH latch is activated, the gamma voltage block and the channel amplifier work normally.
2. The method of claim 1, wherein the adding of the latch increases a gamma voltage settling time of the OLED panel, further comprising: the TLATCH latch comprises a TLATCH1 latch and a TLATCH2 latch, the TLATCH1 latch is activated in the range from the current activation of the SLATCH latch to the next activation of the SLATCH latch, the TLATCH2 latch is activated in the range from the current activation of the SLATCH latch to the next activation of the SLATCH latch, although the PCLK latch does not complete the data transmission of all pixels of a group, the TLATCH1 latch and the TLATCH2 latch can still be activated to operate, and the TLATCH1 latch and/or the TLATCH2 latch enable the gamma voltage block and the channel amplifier to work normally after being activated.
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| CN202010255959.5A CN111415617B (en) | 2020-04-02 | 2020-04-02 | Method for increasing gamma voltage stabilization time of OLED panel by adding latch |
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| CN202010255959.5A CN111415617B (en) | 2020-04-02 | 2020-04-02 | Method for increasing gamma voltage stabilization time of OLED panel by adding latch |
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| CN111415617B true CN111415617B (en) | 2021-07-06 |
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| KR100990276B1 (en) * | 2003-12-22 | 2010-10-26 | 엘지디스플레이 주식회사 | Liquid crystal display and driving method thereof |
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| CN100371785C (en) * | 2006-04-12 | 2008-02-27 | 友达光电股份有限公司 | LCD device and drive circuit thereof |
| KR100744938B1 (en) * | 2006-06-28 | 2007-08-01 | 삼성전기주식회사 | Power supply for plasma display panel |
| KR20130057673A (en) * | 2011-11-24 | 2013-06-03 | 삼성전자주식회사 | Data driver driving method for reducing gamma settling time and display drive device |
| CN104809993A (en) * | 2015-04-15 | 2015-07-29 | 深圳市华星光电技术有限公司 | Source electrode driver and liquid crystal display |
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