KR20090033945A - Display device - Google Patents

Display device Download PDF

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Publication number
KR20090033945A
KR20090033945A KR1020070099028A KR20070099028A KR20090033945A KR 20090033945 A KR20090033945 A KR 20090033945A KR 1020070099028 A KR1020070099028 A KR 1020070099028A KR 20070099028 A KR20070099028 A KR 20070099028A KR 20090033945 A KR20090033945 A KR 20090033945A
Authority
KR
South Korea
Prior art keywords
current
oled
command
setting unit
user
Prior art date
Application number
KR1020070099028A
Other languages
Korean (ko)
Inventor
양승학
Original Assignee
엘지이노텍 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 엘지이노텍 주식회사 filed Critical 엘지이노텍 주식회사
Priority to KR1020070099028A priority Critical patent/KR20090033945A/en
Publication of KR20090033945A publication Critical patent/KR20090033945A/en

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Classifications

    • 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
    • G09G3/2092—Details of a display terminals using a flat panel, the details relating to the control arrangement of the display terminal and to the interfaces thereto
    • 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
    • G09G3/3233—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 with pixel circuitry controlling the current through the light-emitting element
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G09G2310/027—Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
    • 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
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0242—Compensation of deficiencies in the appearance of colours
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G09G2360/141—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light conveying information used for selecting or modulating the light emitting or modulating element
    • G09G2360/142—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light conveying information used for selecting or modulating the light emitting or modulating element the light being detected by light detection means within each pixel

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Electroluminescent Light Sources (AREA)
  • Control Of El Displays (AREA)

Abstract

According to an embodiment, an image display apparatus includes an OLED emitting light, a current controller supplying a current to the OLED, a maximum current value that can be supplied to the OLED by the current controller, and driving the current controller. A current setting unit for controlling, a user interface receiving a command from a user, a command decoder for decoding a user command input through the user interface, and a command for controlling the current setting unit according to the user command decoded by the command decoder Contains registers

Description

Display device

The embodiment relates to an image display apparatus.

Various image display apparatuses employing OLEDs (Organic Light Emitting Diodes) have been used. In the case of OLED, the pixel itself emits light, and since the luminous efficiency of each pixel is different according to the color, luminance adjustment is required for each pixel of red, green, and blue to achieve the required white color. This brightness adjustment is called white balance.

In performing the white balance, by adjusting an external reference resistor, the constant current circuit inside the driver chip is adjusted to control the current for each pixel, and the color adjustment is performed by setting the luminance maximum of each color.

In order to perform white balance in this way, it takes a long time because the adjustment is made by changing the external resistance value, and once the resistance value is selected and the setting operation is completed, it is difficult to change it again.

In addition, since the half-life of each pixel is different from each other due to the OLED characteristic, after a predetermined time elapses, the ratio of decreasing luminance of each pixel is different from each other, resulting in a white balance. As time passes, the white balance of the image display device is distorted. However, it is difficult to adjust the white balance again during use.

The embodiment provides an image display device that can easily implement white balance and automatically correct the white balance over time.

According to an embodiment, an image display apparatus includes an OLED emitting light, a current controller supplying a current to the OLED, a maximum current value that can be supplied to the OLED by the current controller, and driving the current controller. A current setting unit for controlling, a user interface receiving a command from a user, a command decoder for decoding a user command input through the user interface, and a command for controlling the current setting unit according to the user command decoded by the command decoder Contains registers

According to the image display device according to the embodiment, the white balance can be easily implemented and the white balance can be automatically corrected over time.

Hereinafter, exemplary embodiments will be described with reference to the accompanying drawings.

1 is a block diagram illustrating an image display apparatus according to an exemplary embodiment.

As shown in FIG. 1, the image display device according to the embodiment includes an OLED 11, a current control unit 12, a current setting unit 13, a user interface 14, an instruction decoder 15, Instruction register 16 is included.

The OLED 11 emits light to display an image. The OLED 11 is configured in plural to display a color image. As one example, the OLED 11 may be configured to emit red, green, and blue colors. The OLED 11 may include a plurality of red light emitting devices, a plurality of green light emitting devices, and a plurality of blue light emitting devices.

The current control unit 12 supplies a current to the OLED 11. The OLED 11 varies in brightness depending on the magnitude of the current supplied from the current control unit 12. As an example, the current control unit 12 may control the magnitude of the current supplied to the red OLED, the green OLED, and the blue OLED constituting the OLED 11 so that a desired color may be realized.

The current setting unit 13 controls the driving of the current control unit 12. The current setting unit 13 sets a maximum current value that can be supplied to the OLED 11 by the current control unit 12. As one example, the current control unit 12 is applied to the first maximum current value that can be applied to the red OLED constituting the OLED 11, the second maximum current value that can be applied to the green OLED, blue OLED Each of the third maximum current values that can be set may be set. In this way, by setting the maximum current value that can be applied to the OLED of each color, it is possible to perform a white balance to satisfy the set color coordinate.

The current control unit 12 provides the OLED 11 with a data signal for displaying an image within the maximum current value limit set by the current setting unit 13.

Meanwhile, the image display apparatus according to the embodiment includes a user interface 14 which receives a command from a user. The command decoder 15 decodes a user command input through the user interface 14. The command register 16 controls the current setting unit 13 according to the user command decoded by the command decoder 15.

According to the embodiment, the current setting unit 13 may be controlled by the user command input through the user interface 14 as described above. The current setting unit 13 sets the maximum current value that can be applied to the OLED 11 by the current control unit 12 as described above. Therefore, according to the embodiment, it is possible to set the maximum current value that can be applied to the OLED 11 in software by a user command input through the user interface 14. Since the maximum current value that can be applied to the OLED 11 can be set in software as described above, the maximum current value can be selected more easily, and the white color satisfies the set color coordinates through the selection of various maximum current values. Balance can be performed.

The current setting unit 13 according to the embodiment may be implemented as shown in FIGS. 2 and 3 by way of example.

As shown in FIG. 2, the current setting unit 13 may include a DA converter 21 and a current control transistor 23. The user command input from the user interface 14 is transmitted to the DA converter 21 through the command register 16. Accordingly, the value output from the DA converter 21 is determined, and the signal output from the DA converter 21 is applied to the current control transistor 23.

The amount of current output from the current control transistor 23 may be set by the user command input as described above, and the electrical signal output from the current control transistor 23 is applied to the current control unit 12. . Accordingly, the maximum current value that can be applied to the OLED 11 by the current controller 12 can be set. The current control unit 12 sets the size of the maximum current value that can be applied to the OLED 11 according to the size of the signal provided from the current setting unit 13.

Since the maximum current value that can be applied to the OLED 11 can be set in software as described above, the maximum current value can be selected more easily, and the white color satisfies the set color coordinates through the selection of various maximum current values. Balance can be performed.

In addition, the current setting unit 13 may include an internal resistance string 31 and a current control transistor 33 for selecting a resistance value. The user command input from the user interface 14 may select a resistance value in the internal resistance string 31 through the command register 16. The internal resistance string 31 includes a plurality of resistors R0, R1, R2... Rn and a plurality of switches S1, S2,..., Sn. Can be set.

As a result, a resistance value of the internal resistance string 31 is determined, and a signal output from the internal resistance string 31 is applied to the current control transistor 33. The amount of current output from the current control transistor 33 may be set by the user command input as described above, and the electrical signal output from the current control transistor 33 is applied to the current control unit 12. . Accordingly, the maximum current value that can be applied to the OLED 11 by the current controller 12 can be set. The current control unit 12 sets the size of the maximum current value that can be applied to the OLED 11 according to the size of the signal provided from the current setting unit 13.

Since the maximum current value that can be applied to the OLED 11 can be set in software as described above, the maximum current value can be selected more easily, and the white color satisfies the set color coordinates through the selection of various maximum current values. Balance can be performed.

On the other hand, the image display device according to the embodiment may include an optical sensor 17 and the white balance correction unit 18.

The optical sensor 17 detects color coordinates of light emitted from the OLED 11. The optical sensor 17 may be composed of a plurality or may be composed of one. The white balance correction unit 18 compares the color coordinates detected by the optical sensor 17 with the color coordinates set to the white balance value. The white balance correction unit 18 resets the maximum current value that can be supplied to the OLED 11 by the current control unit 12 by controlling the current setting unit 13 so that the set color coordinates can be implemented. .

In general, it is known that deterioration of the OLED 11 occurs according to emission time, and the degree of deterioration according to each color is known to be different. Therefore, in order to continuously perform white balance, since the deterioration degree of each color OLED 11 is different, it is necessary to correct the maximum luminance value setting for each color.

According to an embodiment, this operation may be implemented in software. Therefore, the white balance correction may be automatically performed when a certain period or a predetermined condition is satisfied. In addition, the white balance correction may be performed according to a command input from a user.

As described above, since the white balance correction can be implemented in software, it is possible to easily reflect that the degradation of the OLED 11 occurs over time.

1 is a block diagram illustrating an image display apparatus according to an embodiment.

2 and 3 are views illustrating a current setting unit of an image display device according to an embodiment.

<Explanation of symbols for the main parts of the drawings>

11 ... OLED 12 ... Current control unit

13 ... Current setting section 14 ... User interface

15 ... Command Decoder 16 ... Command Register

17 ... Light sensor 18 ... White balance corrector

21 ... DA converter 23 ... Transistor for current control

31 ... Internal resistance string 33 ... Current control transistor

Claims (4)

OLEDs that emit light; A current controller supplying current to the OLED; A current setting unit which sets a maximum current value that can be supplied to the OLED by the current control unit and controls driving of the current control unit; A user interface for receiving a command from a user; A command decoder that decrypts a user command input through the user interface; A command register for controlling the current setting unit according to a user command decoded by the command decoder; Image display device comprising a. The method of claim 1, The current setting unit includes a DA converter and a current control transistor. The method of claim 1, And the current setting unit includes an internal resistance string for selecting a resistance value and a current control transistor. The method of claim 1, The optical sensor for detecting the color coordinates of the light emitted from the OLED and the color coordinates detected by the optical sensor and the color coordinates set by the white balance value are compared and the current setting unit is controlled so that the set color coordinates are implemented. An image display device including a white balance correction unit for resetting the maximum current value that can be supplied to the OLED.
KR1020070099028A 2007-10-02 2007-10-02 Display device KR20090033945A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020070099028A KR20090033945A (en) 2007-10-02 2007-10-02 Display device

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Application Number Priority Date Filing Date Title
KR1020070099028A KR20090033945A (en) 2007-10-02 2007-10-02 Display device

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Publication Number Publication Date
KR20090033945A true KR20090033945A (en) 2009-04-07

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KR1020070099028A KR20090033945A (en) 2007-10-02 2007-10-02 Display device

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110580879A (en) * 2018-06-07 2019-12-17 华为技术有限公司 Terminal device and display screen control method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110580879A (en) * 2018-06-07 2019-12-17 华为技术有限公司 Terminal device and display screen control method
CN110580879B (en) * 2018-06-07 2021-07-20 华为技术有限公司 Terminal device and display screen control method

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