CN114765015A - Display driving circuit system - Google Patents

Display driving circuit system Download PDF

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Publication number
CN114765015A
CN114765015A CN202110043461.7A CN202110043461A CN114765015A CN 114765015 A CN114765015 A CN 114765015A CN 202110043461 A CN202110043461 A CN 202110043461A CN 114765015 A CN114765015 A CN 114765015A
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CN
China
Prior art keywords
brightness compensation
physical layer
display
circuit
memory
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Pending
Application number
CN202110043461.7A
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Chinese (zh)
Inventor
潘亨霖
许承容
蔡曦彦
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FocalTech Systems Ltd
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FocalTech Systems Ltd
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Filing date
Publication date
Application filed by FocalTech Systems Ltd filed Critical FocalTech Systems Ltd
Priority to CN202110043461.7A priority Critical patent/CN114765015A/en
Publication of CN114765015A publication Critical patent/CN114765015A/en
Pending legal-status Critical Current

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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]
    • 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
    • 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
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness

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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)

Abstract

The invention provides a display driving circuit system. The display driving circuit system comprises a flexible circuit board, a brightness compensation memory (demura RAM) and a display driving integrated circuit. The flexible circuit board is electrically connected with the display panel. The brightness compensation memory is configured on the flexible circuit board. The display driving integrated circuit is configured on the flexible circuit board and has a rectangular structure, wherein a first side of the display driving integrated circuit is electrically connected with the brightness compensation memory, the first side is the shorter side of the rectangular structure of the display driving integrated circuit, and the brightness compensation memory is configured on the first side of the display driving integrated circuit.

Description

Display driving circuit system
Technical Field
The present invention relates to a display driver integrated circuit technology, and more particularly, to a display driver circuit system with a memory for storing brightness compensation data.
Background
Organic light emitting diodes have been increasingly used in high performance displays as a current type light emitting device. Due to its self-luminous property, compared with a liquid crystal display panel, an Active Matrix Organic Light Emitting Diode (AMOLED) has many advantages of high contrast, ultra-thin and flexible. However, the brightness uniformity is still one of the major problems facing it, and in order to solve this problem, in addition to the improvement of the process, brightness compensation techniques have to be mentioned.
A method of compensating for luminance uniformity (Demura) generally uses external compensation, which means a method of sensing electrical or optical characteristics of a pixel by an external driving circuit or device and then compensating. The compensation steps are as follows:
1. the above-mentioned picture is photographed using a high-resolution and high-precision CCD camera.
2. And analyzing the pixel color distribution characteristics according to the data acquired by the camera, and identifying a region with uneven brightness or Mura according to a related algorithm.
3. And generating the Demura data according to the mura data and a corresponding Demura compensation algorithm.
4. Burning the Demura data into a Flash ROM, re-shooting the compensated picture, and confirming that the Mura is eliminated.
Generally, a demura random access memory is required in the oled display driver ic to compensate the voltage of each pixel, but the required size of the random access memory is also greatly increased due to the improvement of the panel resolution, so that the oled display driver ic must be developed in an advanced process, thereby increasing the cost of the oled display driver ic.
Disclosure of Invention
An objective of the present invention is to provide a display driver ic system for reducing the manufacturing cost of the display driver ic, and the display driver ic system can be flexibly applied to different resolutions.
The present invention provides a display driving circuit system for driving a display panel, the display driving circuit system includes a flexible printed circuit (fpc), a brightness compensation memory (demura RAM), and a display driving integrated circuit. The flexible circuit board is electrically connected with the display panel. The optical correction memory is configured on the flexible circuit board. The display driving integrated circuit is configured on the flexible circuit board and has a rectangular structure, wherein the first side of the display driving integrated circuit is electrically connected with the brightness compensation memory, and the first side is the shorter side of the rectangular structure of the display driving integrated circuit. The brightness compensation memory is configured on the first side of the display driving integrated circuit.
According to the display driving circuit system of the preferred embodiment of the present invention, the display driving integrated circuit further includes an interface circuit disposed on the first side of the display driving integrated circuit. In a preferred embodiment, the interface circuit includes a physical layer receiving circuit, a physical layer transmitting circuit and a physical layer controller. The physical layer receiving circuit is coupled with the brightness compensation memory. The physical layer transmission circuit is coupled with the brightness compensation memory. The physical layer controller is coupled to the physical layer receiving circuit and the physical layer transmitting circuit, wherein, when the physical layer controller is started, the physical layer controller receives a brightness compensation Data (demura Data) and transmits the brightness compensation Data from the physical layer transmitting circuit to the brightness compensation memory.
According to the display driving circuit system of the preferred embodiment of the present invention, the display driving integrated circuit further includes a flash memory controller and a brightness compensation controller (demura controller). The flash memory controller is coupled with an external flash memory and the physical layer controller, and is used for capturing the brightness compensation data from the external flash memory and transmitting the brightness compensation data to the physical layer controller. The brightness compensation controller is coupled to the physical layer controller for performing a brightness compensation operation according to the brightness compensation data transmitted by the physical layer controller to correct and compensate the display data for driving the panel.
According to the display driving circuit system of the preferred embodiment of the present invention, the interface circuit further includes a clock switch (clock switch), and the phy layer receiving circuit is further configured to receive the optical correction data of the brightness compensation memory and convert the brightness compensation data into the system frequency of the display driving ic, wherein the display driving ic further includes a line buffer coupled to the clock switch (clock switch) for temporarily storing the brightness compensation data.
According to the display driving circuit system of the preferred embodiment of the present invention, the display driving integrated circuit is further configured to provide a power voltage to the brightness compensation memory, so that the brightness compensation memory operates normally.
The spirit of the invention lies in that the brightness compensation memory (demura RAM) and the Display Drive Integrated Circuit (DDIC) are divided and independent, and when the resolution of the driven panel is different, the brightness compensation memory with different sizes can be adopted. Since the brightness compensation memory is also disposed on the flexible circuit board and on one side of the display driver IC, it will not affect the panel process and can effectively reduce the cost.
In order to make the aforementioned and other objects, features and advantages of the invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1 is a circuit block diagram of a display driving circuit system according to a preferred embodiment of the invention.
FIG. 2 is a diagram of a display driving circuit system according to a preferred embodiment of the invention.
FIG. 3 is a diagram of a display driving circuit system according to a preferred embodiment of the invention.
FIG. 4 is a block diagram of a display driver IC according to a preferred embodiment of the present invention.
FIG. 5 is a block diagram of a display driver IC according to a preferred embodiment of the present invention.
Description of the symbols:
101: flexible circuit board
102: display driving integrated circuit
103. 103-1, 103-2: brightness compensation memory
104: display panel
401: flash memory controller
402: interface circuit
403: optical correction controller
405: flash memory
411: physical layer reception circuit
412: physical layer transmission circuit
413: physical layer controller
504: line buffer
515: frequency switcher
Detailed Description
Fig. 1 is a schematic diagram of a display driving circuit system according to a preferred embodiment of the invention. Referring to fig. 1, the display driver circuit system includes a Flexible Printed Circuit (FPC)101, a Display Driver Integrated Circuit (DDIC)102, and a brightness compensation memory (demura RAM) 103. The flexible circuit board 101 is electrically connected to the display panel 104. The display driver IC 102 and the brightness compensation memory 103 are disposed on the flexible circuit board 101 according to the manufacturing requirements. And in this embodiment, the brightness compensation memory 103 is disposed on the right side of the display driver integrated circuit 102. The shape of the display driver integrated circuit 102 may be generally rectangular or predominantly rectangular.
The main function of the brightness compensation memory 103 is to correct and compensate the mura phenomenon of the display of the panel, especially the display of the Active Matrix Organic Light Emitting Diode (AMOLED) panel. Because of the improvement of panel resolution, it is difficult to add the brightness compensation memory 103 into the conventional display driver ic design, and therefore, in this embodiment, the plug-in brightness compensation memory 103 is disposed on the right side of the display driver ic 102. The right side inside the display driver ic 102 is also provided with an interface circuit corresponding to the brightness compensation memory 103 of the plug-in type.
FIG. 2 is a diagram of a display driving circuit system according to a preferred embodiment of the invention. Referring to fig. 1 and fig. 2, the display driving circuit system includes a Flexible Printed Circuit (FPC)101, a display driving ic 102, and a brightness compensation memory 103. However, in this embodiment, the brightness compensation memory 103 is disposed on the left side of the display driver integrated circuit 102. The display driver ic 102 also has an interface circuit corresponding to the brightness compensation memory 103 of the plug-in type on the left side.
In the above embodiment, the luminance compensation memory 103 is disposed on the left or right side of the display driver ic 102 because the tape-on-film (COF) bonding is performed. Therefore, the location of the illumination compensation memory 103 is very suitable for the tape-to-tape process.
FIG. 3 is a diagram of a display driving circuit system according to a preferred embodiment of the invention. Referring to fig. 3, the display driving circuit system includes a Flexible Printed Circuit (FPC)101, a display driving ic 102, and two luminance compensation memories 103-1 and 103-2. Because different frame frequencies (frame rates) require different sizes of brightness compensation data (demura data) for compensation, there may be no way for one plug-in brightness compensation memory to meet the requirement, and therefore, in the embodiment of the present invention, two or more plug-in brightness compensation memories are used. An additional ID pin may be required for the right interface circuit of the display driver ic 102, through which ID information is provided for identification of the plug-in brightness compensation memory when data is transmitted.
In the embodiment of the invention, since the brightness compensation memory uses the plug-in implementation manner, in order to match the plug-in type, the following embodiment will describe how the display driver integrated circuit DDIC accesses the plug-in type brightness compensation memory to correct the display data of the driving panel. Fig. 4 is a circuit block diagram of the display driver ic 102 according to a preferred embodiment of the invention. Referring to fig. 4, in the embodiment, the display driver ic 102 includes a flash controller 401, an interface circuit 402, and a brightness compensation controller (demura controller) 403. The flash memory controller 401 is coupled to a flash memory 405 for reading the luminance compensation data and transmitting the luminance compensation data to the interface circuit 402. Taking the above fig. 1 as an example, the interface circuit 402 is configured close to the external brightness compensation memory 103, for example, to control the reading and writing of the external brightness compensation memory 103. The luminance compensation controller 403 is coupled to the interface circuit 402 for performing a luminance compensation operation according to the luminance compensation data outputted from the interface circuit to correct and compensate the display data for driving the panel.
The interface circuit 402 includes a physical layer receiving circuit 411, a physical layer transmitting circuit 412 and a physical layer controller 413. The phy layer receive circuit 411 and the phy layer transmit circuit 412 are coupled to the luma compensation memory 103. The phy controller 413 is coupled to the phy receiving circuit 411 and the phy transmitting circuit 412, and the phy controller 413 is also coupled to the flash controller 401 and the illumination compensation controller 403.
When the display driver ic DDIC writes Data into the external brightness compensation memory 103, the flash controller 401 first reads the Data from the flash memory 405, outputs the brightness compensation Data (Demura Data) to the phy controller 413, and writes the Data into the brightness compensation memory 103 through the phy transmission circuit 412. In the embodiment of the present invention, the luminance compensation Memory 103 is implemented, for example, by a Pseudo Static Random Access Memory (PSRAM), and uses an Ultra Low Swing (ULS) voltage format for transmission. Therefore, the phy layer transmission circuit 412 of this embodiment converts the voltage of 1.2V inside the display driver ic DDIC into a voltage of 0.3V that can be received by the brightness compensation memory 103. In the present embodiment, the frequency required by the luminance compensation memory 103 is, for example, about 200MHz, which is higher than the frequency in the display driver ic DDIC, and when writing data into the luminance compensation memory 103, the writing frequency is generated by, for example, the physical layer controller 413.
In addition, when the display driver ic DDIC is to read the external luminance compensation memory 103, the data output from the luminance compensation memory 103 is transmitted to the luminance compensation controller 403 via the phy receiving circuit 411 and the phy controller 413. The read frequency is output by the brightness compensation memory 103, and the frequency division operation is performed by the physical layer controller 413 to reduce the frequency output by the brightness compensation memory 103 to a frequency of about 25MHz, so that the back-end circuit in the display driving integrated circuit DDIC can read the brightness compensation data.
In a preferred embodiment of the present invention, the display driver IC DDIC uses, for example, a clock switch (clock switch) and a Line Buffer (Line Buffer). Fig. 5 is a circuit block diagram of the display driver ic 102 according to a preferred embodiment of the invention. Referring to fig. 5, in comparison with the embodiment shown in fig. 4, the interface circuit 502 further includes a frequency switch 515 coupled to the phy receiving circuit 411 for receiving the luminance compensation data of the luminance compensation memory 103 and converting the luminance compensation data into the system frequency of the display driving ic 102. In addition, the display driver ic 102 further includes a line buffer 504 coupled to the frequency switch 515 for temporarily storing the luminance compensation data and outputting the luminance compensation data to the luminance compensation controller 403. In addition, since the line buffer 504 is used by the conventional illumination compensation controller 403, in the embodiment of fig. 5, the line buffer 504 can be shared with the illumination compensation controller 403 without adding additional circuits.
In summary, the spirit of the present invention is to divide and separate the brightness compensation memory (demura RAM) and the Display Driver Integrated Circuit (DDIC), and when the resolution of the driven panel is different, the brightness compensation memory with different size can be used. In the embodiment of the invention, the brightness compensation memory can store data of brightness compensation (demura) to compensate the problem of uneven brightness during display. Because the brightness compensation memory is also arranged on the flexible circuit board and is arranged on one side of the display driving integrated circuit, the influence on the panel manufacturing process is not caused, and the cost can be effectively reduced.
The detailed description of the preferred embodiments is provided for the purpose of illustrating the technical disclosure of the present invention, and is not intended to limit the present invention to the embodiments described above in a narrow sense, and various modifications may be made without departing from the spirit of the present invention and the scope of the following claims. Therefore, the protection scope of the present invention should be determined by the appended claims.

Claims (6)

1. A display driving circuit system for driving a display panel, the display driving circuit system comprising:
a flexible circuit board electrically connected to the display panel;
a brightness compensation memory configured on the flexible circuit board; and
a display drive IC disposed on the flexible circuit board and having a rectangular structure, wherein a first side of the display drive IC is electrically connected to the brightness compensation memory,
wherein the first side is a shorter side of the rectangular structure of the display driver IC, and the brightness compensation memory is disposed on the first side of the display driver IC.
2. The display driver circuitry of claim 1, wherein the display driver integrated circuit further comprises:
an interface circuit is configured at the first side of the display driving integrated circuit.
3. The display driver circuitry of claim 2, wherein the interface circuit comprises:
a physical layer receiving circuit coupled to the brightness compensation memory;
a physical layer transmission circuit coupled to the brightness compensation memory;
and a physical layer controller coupled to the physical layer receiving circuit and the physical layer transmitting circuit, wherein, when the physical layer controller is started, the physical layer controller receives a brightness compensation data and transmits the brightness compensation data from the physical layer transmitting circuit to the brightness compensation memory.
4. The display driver circuitry of claim 3, wherein the display driver integrated circuit further comprises:
a flash memory controller coupled to an external flash memory and the physical layer controller for capturing the brightness compensation data from the external flash memory and transmitting the brightness compensation data to the physical layer controller;
and a brightness compensation controller coupled to the physical layer controller for performing a brightness compensation operation according to the brightness compensation data transmitted by the physical layer controller to correct the display data for driving the panel.
5. The display driver circuitry of claim 3, wherein the interface circuit further comprises:
a frequency switch, the physical layer receiving circuit is used for receiving the brightness compensation data of the brightness compensation memory and converting the brightness compensation data into the system frequency of the display driving integrated circuit,
wherein, this display driver integrated circuit still includes:
a line buffer coupled to the frequency switch for temporarily storing the luminance compensation data.
6. The display driver circuitry as claimed in claim 1, wherein the display driver IC is further configured to provide a power voltage to the luma compensation memory for the normal operation of the luma compensation memory.
CN202110043461.7A 2021-01-13 2021-01-13 Display driving circuit system Pending CN114765015A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110043461.7A CN114765015A (en) 2021-01-13 2021-01-13 Display driving circuit system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110043461.7A CN114765015A (en) 2021-01-13 2021-01-13 Display driving circuit system

Publications (1)

Publication Number Publication Date
CN114765015A true CN114765015A (en) 2022-07-19

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CN111899692A (en) * 2020-08-24 2020-11-06 武汉天马微电子有限公司 OLED display device, compensation data power-on transmission method and image display method

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