TWI476751B - Display panel driving apparatus and method - Google Patents

Display panel driving apparatus and method Download PDF

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Publication number
TWI476751B
TWI476751B TW097151133A TW97151133A TWI476751B TW I476751 B TWI476751 B TW I476751B TW 097151133 A TW097151133 A TW 097151133A TW 97151133 A TW97151133 A TW 97151133A TW I476751 B TWI476751 B TW I476751B
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TW
Taiwan
Prior art keywords
sets
panel
reference voltages
gamma
gamma reference
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Application number
TW097151133A
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Chinese (zh)
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TW201025260A (en
Inventor
meng ju Wu
Ming Hung Tu
Sheng Kai Hsu
Chih Sung Wang
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Au Optronics Corp
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Priority to TW097151133A priority Critical patent/TWI476751B/en
Publication of TW201025260A publication Critical patent/TW201025260A/en
Application granted granted Critical
Publication of TWI476751B publication Critical patent/TWI476751B/en

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Description

Panel driving device and method

SUMMARY OF THE INVENTION The present invention relates to a flat panel display technology, and more particularly to a panel drive apparatus and method that can improve the color washout of a liquid crystal display.

With the development of optoelectronics and semiconductor technology, the development of flat panel displays has been promoted. Among many flat panel displays, liquid crystal displays have become the market due to their superior characteristics such as high space utilization efficiency, low power consumption, no radiation and low electromagnetic interference. The mainstream. At present, the market's performance requirements for liquid crystal displays are toward high contrast, rapid response and wide viewing angle, and the current technologies that can achieve wide viewing angle requirements include, for example, multi-domain vertical alignment (MVA) and multi-domain horizontal alignment (MHA). Twisted nematic plus viewing angle expansion film (TN+film) and transverse electric field form (IPS).

Although the liquid crystal display of the above-listed technology can achieve a wide viewing angle, its color washout phenomenon is also criticized. In general, the so-called color shift refers to an image screen of different color tones when the user views the image displayed on the liquid crystal display at different viewing angles. For example, if the user is standing at a more oblique angle (for example, 60 degrees) while viewing the image displayed on the liquid crystal display, the color tone of the image displayed will be white. (ie 90 degrees) The color tone of the imagery seen.

In view of this, the present invention provides a panel driving apparatus and method which can improve a color washout generated by a liquid crystal display.

The present invention provides a panel driving device including a timing controller, a gamma voltage generating unit, and a source driver. The timing controller is configured to provide at least one data signal, and the gamma voltage generating unit is configured to provide at least two sets of gamma reference voltages. The source driver is coupled to the timing controller and the gamma voltage generating unit, and is controlled by the timing controller for receiving the data signal and the two sets of gamma reference voltages, and according to the data signal, Two driving signals are mapped in the two sets of gamma reference voltages to drive at least one pixel in the panel.

In an embodiment of the present invention, the pixel has at least two sub-pixels, and the two sub-pixels are turned on by the same scanning signal, and are respectively driven by the two driving signals. .

In an embodiment of the invention, the gamma voltage generating unit includes a first resistor string and a second resistor string. The first resistor string is coupled between a system voltage and a reference voltage, and is composed of a plurality of first variable resistors for providing one of the two sets of gamma reference voltages. The second resistor string is also coupled between the system voltage and the reference voltage, and is composed of a plurality of second variable resistors for providing another set of the two sets of gamma reference voltages. .

The present invention further provides a panel driving method, comprising: first, providing a data signal and two sets of gamma reference voltages. And then mapping at least two driving signals in the two sets of gamma reference voltages according to the data signal Number to drive at least one pixel in the panel.

In an embodiment of the present invention, before driving the pixel, the panel driving method provided by the present invention further includes providing a scan signal to simultaneously turn on at least two sub-pixels in the pixel. The two sub-pixels are each driven by the two driving signals.

In an embodiment of the invention described above, the two sets of gamma reference voltage systems are the same or different.

In an embodiment of the invention described above, the two driving signals are the same or different driving polarities.

The present invention further provides a liquid crystal display having the above-described panel driving device of the present invention.

The panel driving apparatus and method proposed by the present invention are mainly applied to a panel having a partitioned pixel structure (for example, 2D1G). The panel driving apparatus and method proposed by the present invention independently provide two sets of gamma reference voltages for use by the source driver.

In this way, when the timing controller provides a data signal to the source driver, the source driver maps two driving signals having opposite driving polarities to the two sets of gamma reference voltages according to the data signal, Do not drive two sub-pixels in a single pixel, and let one of the two sub-pixels display a higher grayscale color, and let the other sub-pixel display a lower grayscale color. Thereby, the color of the higher gray scale and the lower gray scale are mixed into a middle gray scale color, so that the user can view the image displayed by the liquid crystal display from a front view or a tilt angle. , you can see the image of similar color tone.

The above and other objects, features and advantages of the present invention will become more <RTIgt;

The technical effect to be achieved by the present invention is to improve the color washout produced by the liquid crystal display. The following description of the technical means and functions of the present invention will be described in detail in the related art.

1 is a block diagram of a system of a liquid crystal display according to an embodiment of the invention. 2 is a schematic diagram of a partial pixel array of a panel according to an embodiment of the invention. 1 and 2, a liquid crystal display (LCD) 100 includes a display panel 101, a gate driver 103, a source driver 105, and a timing controller 107. A gamma voltage generating unit 109, and a backlight module 111. Among them, the source driver 105, the timing controller 107, and the gamma voltage generating unit 109 constitute the panel driving device of the present invention.

In the present embodiment, the panel 101 has a plurality of pixels Pix arranged in an array, and each pixel Pix is divided into two regions. One of the regions is the main sub-pixel M, and the other region is the sub sub-pixel S. It should be noted at the outset that those having ordinary knowledge in the field of the present invention should know after viewing the diagram disclosed in FIG. 2 that this embodiment adopts a partitioned pixel structure (for example, 2D1G, Wherein D refers to the data line Dn~Dn+3, and G refers to the panel 101 of the scan lines Gn, Gn+1), but the invention is not limited thereto, and the number of data lines and scan lines can be designed according to actual design. Any change in demand.

The backlight module 111 is used to provide a surface light source required by the panel 101, so that the panel 101 can achieve the purpose of displaying an image. The gate driver 103 is coupled to and controlled by the timing controller 107 for receiving the start pulse STV provided by the timing controller 107, and sequentially outputs a scan signal to turn on the panel 101. Each column of pixels. Here, since the present embodiment employs the panel 101 having a partitioned pixel structure (ie, 2D1G), the main sub-pixels M and the sub-sub-pixels S of all the pixels Pix in the same column of pixels are scanned the same. The signal is turned on.

The gamma voltage generating unit 109 is configured to provide at least two sets of gamma reference voltages GA1 to GAn, GB1 to GBn. 3 is a circuit diagram of a gamma voltage generating unit according to an embodiment of the present invention. Referring to FIG. 1 to FIG. 3 together, the gamma voltage generating unit 109 includes a first resistor string 301 and a second power string 303. The first resistor string 301 is coupled between the system voltage V DDA of the panel 101 and a reference voltage (for example, a ground potential), and is composed of a plurality of first variable resistors RA1 R RAn for A set of gamma reference voltages GA1~GAn is provided. In addition, the second resistor string 303 is also coupled between the system voltage V DDA and the reference voltage, and is composed of a plurality of second variable resistors RB1 RB RBn for providing another set of gamma reference voltages GB1~ GBn.

The source driver 105 is coupled to the timing controller 107 and the gamma voltage generating unit 109, and is controlled by the timing controller 107 for receiving timing control. a data signal DS provided by the device 107 and the two sets of gamma reference voltages GA1~GAn, GB1~GBn, and according to the data signal DS, the two sets of gamma reference voltages GA1~GAn, GB1~GBn Two mapping driving signals with different driving polarities (for example, the +/- labels in FIG. 2 represent positive polarity and negative polarity respectively) are provided to provide two data lines (Dn, Dn+1) or (Dn). +2, Dn+3), to drive the main sub-pixel M and the sub-sub-pixel S in the pixel Pix.

Based on the above, in order to allow the same data signal DS to map two driving signals having different driving polarities in the two sets of gamma reference voltages GA1~GAn, GB1~GBn, respectively, to drive the main sub-pixels in the pixel Pix. M and the second sub-pixel S. In this embodiment, only the ratio between the resistance values of the variable resistors RA1 to RAn of the first variable resistor string is adjusted to be the resistance of the variable resistors RB1 RB RBn of the second variable resistor string according to the voltage division principle. The ratios are different, so that the two sets of gamma reference voltages GA1~GAn, GB1~GBn are different.

In other words, in this embodiment, the resistance values of the first variable resistors RA1 RRAn and the second variable resistors RB1 RB RBn are adjusted, so that the same data signal DS can be used in the two sets of gamma reference voltages GA1 GGn Two driving signals with different driving polarities are mapped in GB1~GBn.

In addition, in the present embodiment, one of the main sub-pixels M and the second sub-pixels S in the same pixel Pix will display a higher grayscale color, and the other will display a lower grayscale color. In this way, after mixing the color of the higher gray scale with the color of the lower gray scale to form an intermediate gray scale color, the user can view the liquid crystal display 100 from the front view or the oblique angle. When the displayed image is displayed, the image of the similar color tone can be viewed.

However, in other embodiments of the present invention, when the panel 101 is not a pixel structure having a partition, the user can adjust the resistance of each of the first variable resistors R1 to RAn and the second variable. The resistances of the resistors RB1 RB RBn are the same, so that the two sets of gamma reference voltages GA1 GGn, GB1 ̄ GBn are the same. In this way, the polarity of the two driving signals mapped by the same data signal DS in the two sets of gamma reference voltages GA1~GAn and GB1~GBn is the same, so that the panel driving device proposed by the present invention can be It is also applied to panels with partitioned or non-partitioned pixel structures to meet the versatility of the design.

4 is a flow chart of a panel driving method according to an embodiment of the present invention. Referring to FIG. 4, the panel driving method of the embodiment includes: first, providing a data signal and two sets of gamma reference voltages as described in step S401. Then, as described in step S403, at least two driving signals are mapped in the two sets of gamma reference voltages according to the data signal, so as to drive at least one pixel in the panel.

In this embodiment, before driving the pixel, the panel driving method of the embodiment further includes providing a scan signal to simultaneously turn on at least two sub-pixels in the pixel, thereby causing the two driving signals. Each of the two sub-pixels is driven separately. It is worth mentioning that when the panel is configured to have a partitioned pixel structure, the two sets of gamma reference voltages are different, and the two driving signals can be different driving polarities, but when the panel When the pixel structure with partitions is used, the two sets of gamma reference voltages are the same, and the two driving signals are also the same driving polarity.

In summary, the panel driving apparatus and method proposed by the present invention are mainly applied to a panel having a partitioned pixel structure (for example, 2D1G). The panel driving apparatus and method proposed by the present invention independently provide two sets of gamma reference voltages for use by the source driver.

In this way, when the timing controller provides a data signal to the source driver, the source driver maps at least two driving signals having opposite driving polarities to the two sets of gamma reference voltages according to the data signal. Each of the two sub-pixels in one pixel is driven, and one of the two sub-pixels is displayed with a higher gray color, and the other sub-pixel is displayed with a lower gray color. Thereby, the color of the higher gray scale and the lower gray scale are mixed into a middle gray scale color, so that the user can view the image displayed by the liquid crystal display from a front view or a tilt angle. , you can see the image of similar color tone.

Of course, based on the above disclosure, the panel driving apparatus and method proposed by the present invention can also be applied to a panel having a non-partitioned pixel structure. In this way, when the timing controller provides a data signal to the source driver, the source driver maps two driving signals having the same driving polarity to the two sets of gamma reference voltages according to the data signal. Don't drive the two sub-pixels in a single pixel, so as to satisfy the versatility of the design.

While the invention has been described above in terms of a plurality of embodiments, which are not intended to limit the scope of the invention, the invention may be modified and modified without departing from the spirit and scope of the invention. , Therefore, the scope of the invention is defined by the scope of the appended claims.

100‧‧‧LCD display

101‧‧‧ panel

103‧‧‧gate driver

105‧‧‧Source Driver

107‧‧‧Timing controller

109‧‧‧Gamma voltage generating unit

111‧‧‧Backlight module

Pix‧‧‧ pixels

M‧‧‧ Master Picture

S‧‧‧ sub-pixels

Dn~Dn+3‧‧‧ data line

Gn, Gn+1‧‧‧ scan line

+/-‧‧‧ drive polarity

STV‧‧‧ starting pulse

DS‧‧‧Information Signal

GA1~GAn, GB1~GBn‧‧‧ gamma reference voltage

V DDA ‧‧‧ panel system voltage

RA1~RAn, RB1~RBn‧‧‧variable resistor

S401~S403‧‧‧ Steps of the flowchart of the panel driving method according to an embodiment of the present invention

1 is a block diagram of a system of a liquid crystal display according to an embodiment of the invention.

2 is a schematic diagram of a partial pixel array of a panel according to an embodiment of the invention.

3 is a circuit diagram of a gamma voltage generating unit according to an embodiment of the present invention.

4 is a flow chart of a panel driving method according to an embodiment of the present invention.

100‧‧‧LCD display

101‧‧‧ panel

103‧‧‧gate driver

105‧‧‧Source Driver

107‧‧‧Timing controller

109‧‧‧Gamma voltage generating unit

111‧‧‧Backlight module

STV‧‧‧ starting pulse

DS‧‧‧Information Signal

GA1~GAn, GB1~GBn‧‧‧ gamma reference voltage

Claims (13)

  1. A panel driving device includes: a timing controller for providing at least one data signal; a gamma voltage generating unit for simultaneously providing at least two sets of gamma reference voltages; and a source driver coupled to the timing control And the gamma voltage generating unit, and controlled by the timing controller, for receiving the data signal and the two sets of gamma reference voltages, and according to the data signal, in the two sets of gamma reference voltages Two drive signals are mapped to drive at least one pixel in the panel.
  2. The panel driving device of claim 1, wherein the pixel has at least two sub-pixels, and the two sub-pixels are turned on by the same scanning signal, and each of the two pixels is Two drive signals are driven.
  3. The panel driving device of claim 2, wherein the gamma voltage generating unit comprises: a first resistor string coupled between a system voltage and a reference voltage, and the plurality of first variable a resistor, configured to provide one of the two sets of gamma reference voltages; and a second resistor string coupled between the system voltage and the reference voltage, and configured by a plurality of second variable resistors And configured to provide another one of the two sets of gamma reference voltages.
  4. The panel driving device of claim 3, wherein the two sets of gamma reference voltage systems are different.
  5. The panel driving device of claim 3, wherein The two drive signals are of different drive polarities.
  6. A liquid crystal display having a panel driving device as described in claim 1 of the patent application.
  7. A panel driving method includes: providing a data signal and simultaneously providing two sets of gamma reference voltages; and mapping at least two driving signals in the two sets of gamma reference voltages according to the data signals, thereby driving the panel At least one pixel.
  8. The panel driving method of claim 7, wherein before driving the pixel, the method further comprises: providing a scan signal to simultaneously turn on at least two sub-pixels in the pixel.
  9. The panel driving method of claim 8, wherein the two sub-pixels are each driven by the two driving signals.
  10. The panel driving method of claim 7, wherein the two sets of gamma reference voltage systems are different.
  11. The panel driving method of claim 7, wherein the two driving signals are different driving polarities.
  12. A panel driving device includes: a timing controller for providing at least one data signal; a gamma voltage generating unit for providing at least two sets of gamma reference voltages, wherein the gamma voltage generating unit is not for switching output Providing the two sets of gamma reference voltages; and a source driver coupled to the timing controller and the gamma voltage generating unit, and controlled by the timing controller for receiving the data signal and the Two sets of gamma reference voltages are described, and two driving signals are mapped in the two sets of gamma reference voltages according to the data signals, thereby driving at least one pixel in the panel.
  13. A panel driving method includes: providing a data signal and providing two sets of gamma reference voltages, wherein the two sets of gamma reference voltages are not provided by switching output; and the two sets of gamma according to the data signal At least two driving signals are mapped in the reference voltage to drive at least one pixel in the panel.
TW097151133A 2008-12-26 2008-12-26 Display panel driving apparatus and method TWI476751B (en)

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TW097151133A TWI476751B (en) 2008-12-26 2008-12-26 Display panel driving apparatus and method

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TWI595467B (en) * 2016-08-18 2017-08-11 友達光電股份有限公司 Display device
TWI603314B (en) * 2016-11-30 2017-10-21 友達光電股份有限公司 Control method for display

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW200813950A (en) * 2006-09-13 2008-03-16 Himax Tech Ltd Apparatus for driving a display
CN101201522A (en) * 2006-10-30 2008-06-18 三星电子株式会社 Liquid crystal display device and method of manufacturing the same

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW200813950A (en) * 2006-09-13 2008-03-16 Himax Tech Ltd Apparatus for driving a display
CN101201522A (en) * 2006-10-30 2008-06-18 三星电子株式会社 Liquid crystal display device and method of manufacturing the same

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