WO2015135222A1

WO2015135222A1 - Liquid crystal display and driving method thereof

Info

Publication number: WO2015135222A1
Application number: PCT/CN2014/073595
Authority: WO
Inventors: 樊勇
Original assignee: 深圳市华星光电技术有限公司
Priority date: 2014-03-13
Filing date: 2014-03-18
Publication date: 2015-09-17
Also published as: CN103838035A

Abstract

A liquid crystal display and a driving method for driving the liquid crystal display. The liquid crystal display comprises a display panel (20), a backlight module (40) and a driving module (50), wherein the display panel (20) comprises a light filter substrate (26), the light filter substrate (26) comprises a plurality of light filter units with each comprising a red light filter (261), a blue light filter (263) and a transparent light filter (262); the backlight module (40) comprises a first backlight (41) and a green backlight (42), and the first backlight (41) is formed by encapsulation of a blue luminous chip (411) and red fluorescent powder. The liquid crystal display and the driving method thereof can not only decrease the loss of the backlights and increase the rate of utilization of the backlights by arranging the transparent light filter on the light filter substrate, but also reduce the use of the green luminous chip by means of the first backlight formed by encapsulation of the blue luminous chip and the red fluorescent powder; meanwhile, the liquid crystal display also has high degree of color expression.

Description

Liquid crystal display and driving method thereof

The present invention belongs to the field of liquid crystal display technology; more specifically, it relates to a liquid crystal display and a driving method thereof.

Background technique

Today's technology is booming, and the variety of information products is innovating to meet the different needs of the public. Most of the early displays were cathode ray tube (CRT) displays, which were bulky and power consuming, and the resulting radiation was a health hazard for users who used the display for extended periods of time. As a result, today's displays on the market are gradually replacing the old CRT displays with liquid crystal displays (LCDs). Liquid crystal display (LCD) has many advantages such as thin body, power saving, and no radiation, which has been widely used. Referring to FIG. 1, a liquid crystal display provided by the prior art includes a backlight module 10, a display panel 20, and a driving module 50. The display panel 20 includes a lower polarizing layer 21, an array substrate 23, a liquid crystal layer 25, a filter substrate 24, and an upper polarizing layer 22 which are disposed in this order away from the backlight module 10. The backlight module 10 is provided with a white light source 11; the filter substrate 24 includes a plurality of sets of filter units, each set of filter units including a red filter 241, a green filter 242 and a blue filter. 243. When displayed, the driving module 50 drives the white light source 11 to emit light, and simultaneously drives the red sub-pixel, the blue sub-pixel and the green sub-pixel to display, wherein the gray sub-pixels of the red sub-pixel, the blue sub-pixel and the green sub-pixel are displayed by The information of the image screen is determined. However, in such a liquid crystal display, the filter substrate 24 has a large loss of light, resulting in a low utilization rate of the white light source 11, and its utilization is less than 33%. In order to improve the utilization of the backlight module 10, a new display mode has been proposed in recent years. Referring to FIG. 2, a liquid crystal display provided by the prior art includes a backlight module 30, a display panel 20, and a driving module 50. The display panel 20 includes a lower polarizing layer 21, an array substrate 23, a liquid crystal layer 25, a filter substrate 26, and an upper polarizing layer 22 which are disposed in this order away from the backlight module 30. The backlight module 30 is provided with a white light source 31 and a green light source 32. The filter substrate 26 includes a plurality of sets of filter units, each set of filter units including a red filter 261, a transparent filter 262, and Blue filter 263. Displayed into odd and even frames: In odd frames, The driving module 50 drives the white light source 31 to emit light while driving the red sub-pixel and the blue sub-pixel for display; in the even frame, the driving module 50 drives the green light source 32 to emit light while driving the green sub-pixel for display. With the continuous alternation of odd and even frames, the image can be completely displayed. However, in this display mode, the white light source is usually configured by a red light emitting chip, a blue light emitting chip, and a green light emitting chip, or a blue light emitting chip and a green light emitting chip plus red phosphor. If the red light emitting chip, the blue light emitting chip and the green light emitting chip are used, the cost is high and the driving is complicated, and the lifetime decay of the three different color chips is inconsistent, which causes the chromaticity drift, thereby reducing the display of the liquid crystal display. Quality; If the blue light-emitting chip and the green light-emitting chip plus red phosphor are used, not only the driving method is complicated, but also the utilization rate of the backlight module 30 is still low. Summary of the invention

In order to solve the above problems in the prior art, it is an object of the present invention to provide a liquid crystal display having high backlight module utilization and high color expression and a driving method thereof.

In order to achieve the above object, an object of the present invention is to provide a liquid crystal display including a display panel, a backlight module, and a driving module, wherein the filter substrate of the display panel includes a plurality of sets of filter units, each group The filter unit includes a red filter, a blue filter, and a transparent filter; the backlight module includes a first backlight and a green backlight, and the first backlight is composed of a blue light emitting chip and a red phosphor. Packaged.

The display panel is provided with red sub-pixels, blue sub-pixels and transparent sub-pixels respectively corresponding to the red filter, the blue filter and the transparent filter. The driving module drives the first backlight to emit light while driving the red sub-pixel, the blue sub-pixel and the transparent sub-pixel to display in an odd frame/even frame; in an even frame/odd frame, the driving station The green backlight is displayed for display while driving transparent sub-pixels for display. The size of the gray scale that drives the display of the red sub-pixel, the blue sub-pixel, and the transparent sub-pixel is determined by information of the image frame. The driving module drives the backlight module and the display panel at a frequency of 120 Hz. Wherein the red filter is made of a red resin, the blue filter is made of a blue resin, and the transparent filter is made of a transparent material. The green backlight is encapsulated by a green light emitting chip. Another object of the present invention is to provide a driving method of a liquid crystal display, which drives as described above. The liquid crystal display adopts a method: when the odd frame/even frame is used, the first backlight is driven to emit light, and the red sub-pixel, the blue sub-pixel and the transparent sub-pixel are driven to display; when the even frame/odd frame is driven, the green is driven The light backlight is displayed while driving transparent sub-pixels for display. The size of the gray scale that drives the display of the red sub-pixel, the blue sub-pixel, and the transparent sub-pixel is determined by information of the image frame. The frequency of the driving backlight module and the display panel is 120 Hz. The liquid crystal display and the driving method thereof provided by the invention can not only reduce the loss of the backlight by the transparent filter disposed on the filter substrate, but also improve the utilization ratio of the backlight; and can also be added by the blue light emitting chip The first backlight of the red phosphor package is used to reduce the use of the green light-emitting chip; meanwhile, the liquid crystal display also has high color expression. DRAWINGS

FIG. 1 is a schematic structural view of a liquid crystal display provided by the prior art.

2 is a schematic structural view of another liquid crystal display provided by the prior art. FIG. 3 is a schematic structural diagram of a liquid crystal display according to an embodiment of the present invention. detailed description

In order to better explain the technical features and structures of the present invention, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings.

Referring to FIG. 3 , the liquid crystal display provided by the embodiment includes a backlight module 40 , a display panel 20 , and a driving module 50 . The display panel 20 includes a lower polarizing layer 21, an array substrate 23, a liquid crystal layer 25, a filter substrate 26, and an upper polarizing layer 22 which are disposed in this order away from the backlight module 40. The filter substrate 26 includes a plurality of sets of filter units, each set of filter units including a red filter 261, a transparent filter 262, and a blue filter 263 disposed in sequence. Of course, in other embodiments, The positions of the red filter 261, the transparent filter 262, and the blue filter 263 can be freely changed. Among them, the red color filter 261 is made of a red resin, the blue color filter 263 is made of a blue resin, and the transparent color filter 262 is made of a transparent material. In a preferred embodiment, red filter 261, transparent filter 262, and blue filter 263 have similar widths. The display panel 20 is provided with red sub-pixels, blue sub-pixels, and transparent sub-pixels corresponding to the red color filter 261, the blue color filter 263, and the transparent color filter 262, respectively. The backlight module 40 is provided with a first backlight 41 and a green backlight 42. The first backlight 41 is encapsulated by a blue light emitting chip 411 and a red phosphor, and the green backlight 42 is encapsulated by a green light emitting chip 421. . The driving module 50 is configured to drive the backlight module 40 and the display panel 20, wherein the first backlight 41 and the green backlight 42 in the backlight module 40 are respectively controlled by the driving module 50. The liquid crystal display provided in this embodiment is a fast response device. In a preferred embodiment, the driving module 50 drives the backlight module 40 and the display panel 20 at a frequency of 120 Hz. The driving module 50 drives the first backlight 41 to emit light in the odd frame/even frame, and simultaneously drives the red sub-pixel, the blue sub-pixel and the transparent sub-pixel to display; in the even frame/odd frame, drives the green backlight 42 to perform Display, while driving transparent sub-pixels for display. The size of the gray scale displayed by the red sub-pixel, the blue sub-pixel, and the transparent sub-pixel is determined by the color of the image frame on the pixel. Based on the same inventive concept, the present embodiment also provides a driving method for driving the liquid crystal display as described above. The driving method divides an image into two frames to display: the first frame drives the first backlight 41 to emit light, and simultaneously drives the red sub-pixel, the blue sub-pixel and the transparent sub-pixel for display; the second frame drives the green back The light source 42 performs display while driving the transparent sub-pixels for display. Of course, in other embodiments, the display of the first frame and the second frame may be reversed. Thus, in the first frame, the red sub-pixel and the blue sub-pixel respectively display red and blue, and the transparent sub-pixel displays the magenta emitted by the first backlight 41, which is improved by the display of the transparent sub-pixel. The light-emitting utilization rate of the backlight 41 saves the use of the blue reflective chip 411, thereby reducing the cost of the backlight module 50. Meanwhile, referring to Table 1, since the first backlight 41 is packaged by using the blue light emitting chip 411 and red phosphor, in the display of the first frame, the red filter 261, the transparent filter 262, and the blue filter. The transmittance of the light sheet 263 to the first backlight 41 is higher than that of the white light source provided in the prior art, thereby further reducing the backlight cost. In the second frame, the red sub-pixel and the blue sub-pixel do not emit light, and the transparent sub-pixel emits a filter. Since the transmittance of the transparent sub-pixel is large, the utilization ratio of the green backlight 42 is improved. Since the driving method is a fast response driving, the driving frequency thereof is preferably 120 Hz, and the highest frequency at which the human eye distinguishes things is 24 Hz, so that the image mixed by the first frame and the second frame is seen when viewed. Further, the size of the gray scale displayed by driving the red sub-pixel, the blue sub-pixel, and the transparent sub-pixel is determined by the information of the image frame, and therefore, the last seen image is the image to be displayed. Table 1 This scheme and the existing scheme show the same picture when the first frame of the chrominance analog table backlight module red sub-pixel transparent sub-pixel blue sub-pixel total through rate (R+G) + red powder 0.68% 4.75% 0.3% 5.72%

B+ red powder 2.17% 2.17% 0.47% 7.55% In summary, the liquid crystal display and the driving method thereof provided by the invention can reduce the loss of the backlight by the transparent filter disposed on the filter substrate, thereby improving The utilization of the backlight; and the use of the first backlight of the blue light emitting chip and the red phosphor to reduce the use of the green light emitting chip; meanwhile, the liquid crystal display also has a high color expression.

It should be noted that, in this context, relational terms such as first and second are used merely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply these entities or operations. There is any such actual relationship or order between them. Furthermore, the terms "including", "comprising" or "comprising" or "comprising" are intended to encompass a non-exclusive inclusion, such that a process, method, article, or device that includes a plurality of elements includes not only those elements but also Other elements, or elements that are inherent to such a process, method, item, or device. In the absence of more limitations, the elements defined by the phrase "comprising a ..." do not exclude the presence of additional elements in the process, method, article, or device. While the invention has been particularly shown and described with reference to the exemplary embodiments of the embodiments of the invention Various changes in form and detail.

Claims

claims

1. A liquid crystal display, including a display panel, a backlight module and a driving module, wherein the display panel includes a filter substrate, wherein the filter substrate includes multiple groups of filter units, and each group of filter units includes Red filter, blue filter and transparent filter; The backlight module includes a first backlight source and a green backlight source. The first backlight source is packaged by a blue light emitting chip and red phosphor.

2. The liquid crystal display according to claim 1, wherein the display panel is provided with red sub-pixels, blue sub-pixels and transparent sub-pixels corresponding to red filters, blue filters and transparent filters respectively. sub-pixel.

3. The liquid crystal display according to claim 2, wherein the driving module drives the first backlight source to emit light in odd/even frames, and simultaneously drives red sub-pixels, blue sub-pixels and transparent sub-pixels. Display; In even-numbered frames/odd-numbered frames, the green backlight is driven for display, and the transparent sub-pixel is driven for display at the same time.

4. The driving method of the liquid crystal display according to claim 3, wherein the size of the grayscale displayed by driving the red sub-pixel, blue sub-pixel and transparent sub-pixel is determined by the information of the image screen.

5. The liquid crystal display according to claim 4, wherein the driving module drives the backlight module and the display panel at a frequency of 120 Hz.

6. The liquid crystal display according to claim 3, wherein the driving module drives the backlight module and the display panel at a frequency of 120 Hz.

7. The liquid crystal display according to claim 1, wherein the red filter is made of red resin, the blue filter is made of blue resin, and the transparent filter is made of transparent material. become.

8. The liquid crystal display according to claim 1, wherein the green backlight source is packaged by a green light-emitting chip.

9. A method of driving a liquid crystal display, wherein the method of driving the liquid crystal display as claimed in claim 2 is: during odd/even frames, drive the first backlight source to emit light, and simultaneously drive red sub-pixels and blue sub-pixels. Sub-pixels and transparent sub-pixels are displayed; during even/odd frames, the green backlight is driven for display, and the transparent sub-pixel is driven for display at the same time.

10. The driving method of a liquid crystal display according to claim 9, wherein: driving the red The size of the gray scale displayed by sub-pixels, blue sub-pixels and transparent sub-pixels is determined by the information of the image frame.

11. The driving method of the liquid crystal display according to claim 10, wherein the frequency of driving the backlight module and the display panel is 120 Hz.

12. The driving method of the liquid crystal display according to claim 9, wherein the frequency of driving the backlight module and the display panel is 120 Hz.