TWI740567B - Display apparatus - Google Patents

Abstract

A display apparatus is disclosed. The display apparatus includes a color filter, a first backlight unit, a second backlight unit and a third backlight unit. The first backlight unit, the second backlight unit and the third backlight unit are disposed corresponding to the color filter and individually emit a first color light, a second color light and a third color light to the color filter. In a brightness mode, the first color light has a first intensity, the second color light has a second intensity and the third color light has a third intensity. In a color mode, when a screen of the display is biased to a third color corresponding to the third color light, the display apparatus reduces at least one of the first intensity and the second intensity.

Description

Display device

The present invention relates to a display device, and particularly relates to a display device that can effectively improve the quality of the display picture.

Generally speaking, traditional liquid crystal display screens usually use white light-emitting backlight modules, and filter out the remaining unwanted spectrum through red, green, and blue color filters to display them separately. Red, green and blue screens.

However, in practical applications, because the above-mentioned color filter still cannot completely separate the red, green, and blue light, the traditional liquid crystal display still leaks a little green light when displaying blue images (as shown in Figure 1A). As shown) and a little blue and red light (as shown in FIG. 1B) are still leaked when displaying a green image, resulting in poor color saturation of the display image, which seriously affects the quality of the display image and needs to be improved urgently.

In view of this, the present invention proposes a display device to effectively solve the above-mentioned problems encountered in the prior art.

A specific embodiment according to the present invention is a display device. In this embodiment, the display device includes a color filter, a first backlight unit, a second backlight unit, and a third backlight unit. The first backlight unit, the second backlight unit and the third backlight unit are arranged relative to the color filter and each independently emit the first color light, the second color light and the third color light to the color filter. In the brightness mode, the first color light has a first intensity, the second color light has a second intensity, and the third color light has a third intensity. In the color mode, when the display screen of the display device is biased toward the third color corresponding to the third color light, the display device reduces at least one of the first intensity and the second intensity.

In one embodiment, the third color light is blue light and the first color light and the second color light are red light and green light, respectively, and in the brightness mode, the first color light, the second color light, and the third color light are first mixed into white light. Then enter the color filter.

In one embodiment, in the color mode, when the display screen deviates to the second color corresponding to the second color light, the display device reduces at least one of the first intensity and the third intensity.

In one embodiment, the first color light, the second color light, and the third color light are red light, green light, and blue light, respectively, and in the brightness mode, the first color light, the second color light, and the third color light are first mixed into white light. Then enter the color filter.

In one embodiment, the first display area and the second display area of the display screen correspond to a color mode and a brightness mode, respectively.

In one embodiment, the display device further includes a fourth backlight unit, which is arranged relative to the color filter and is independently controlled to emit a fourth color light, so that the second display area displays the first color light, the second color light, and the second color light. Mixed light of three-color light and fourth-color light.

In one embodiment, when the first display screen changes in the first display area, the first backlight unit, the second backlight unit, and the third backlight unit correspondingly adjust the first color light, At least one of the second color light and the third color light.

In one embodiment, when the second display screen changes in the second display area, the first backlight unit, the second backlight unit, and the third backlight unit correspondingly adjust the first color light, At least one of the second color light and the third color light.

In one embodiment, the color filter includes a first filter area, a second filter area, and a third filter area, which correspond to the first backlight unit, the second backlight unit, and the third backlight unit, respectively. The first color light, the second color light, and the third color light are filtered.

In one embodiment, the color filter includes a color filter layer, the color filter layer includes a first filter area, a second filter area, and a third filter area, a first backlight unit, a second backlight unit, and a The size of the three backlight units is larger than the sizes of the first filter area, the second filter area and the third filter area.

In one embodiment, the color filter includes a liquid crystal layer and a color filter layer, the liquid crystal layer includes a first liquid crystal region, a second liquid crystal region, and a third liquid crystal region, and the color filter layer includes a first filter region and a second liquid crystal region. The filter area and the third filter area respectively correspond to the first liquid crystal area, the second liquid crystal area and the third liquid crystal area. When the display screen is biased toward the third color, the third intensity is greater than the first intensity and the second intensity, and The rotation angle of the third liquid crystal area is greater than the rotation angles of the first liquid crystal area and the second liquid crystal area. The rotation angles of the first liquid crystal area, the second liquid crystal area and the third liquid crystal area are adjusted according to the condition of the display screen to determine the display The color of the picture.

Another specific embodiment according to the present invention is also a display device. In this embodiment, the display device includes a color filter, a first backlight unit, a second backlight unit, and a third backlight unit. The color filter corresponds to the display area of the display device. The first backlight unit, the second backlight unit and the third backlight unit are arranged relative to the color filter and each independently emit the first color light, the second color light and the third color light to the color filter. When the first display picture changes in the display area, the first backlight unit, the second backlight unit, and the third backlight unit correspondingly adjust the first color light, the second color light, and the third color light that they emit according to the first dimming mode. At least one of them.

In one embodiment, the first dimming mode corresponds to the change of the first display screen for adjusting the chroma of at least one of the first color light, the second color light, and the third color light.

In one embodiment, when the second display screen changes in the display area, the first backlight unit, the second backlight unit, and the third backlight unit correspondingly adjust the first color light and the second light emitted by the first backlight unit, the second backlight unit, and the third backlight unit according to the second dimming mode At least one of colored light and third colored light.

In one embodiment, the second dimming mode corresponds to the change of the second display screen and is used to adjust the chroma of at least one of the first color light, the second color light, and the third color light.

In one embodiment, the display device further includes a fourth backlight unit, which is arranged relative to the color filter and is independently controlled to emit the fourth color light. When the first display image change occurs in the display area, the fourth backlight unit selectively adjusts the fourth color light emitted by the fourth backlight unit according to the first dimming mode.

In one embodiment, the first dimming mode corresponds to the change of the first display screen for selectively adjusting the brightness of the fourth color light.

In one embodiment, when the first display screen changes to increase the brightness of the display screen, the first dimming mode also reduces the chroma of at least one of the first color light, the second color light, and the third color light; When the display screen changes to reduce the brightness of the display screen, the first dimming mode also increases the chroma of at least one of the first color light, the second color light, and the third color light.

In one embodiment, the color filter includes a first filter area, a second filter area, and a third filter area, which correspond to the first backlight unit, the second backlight unit, and the third backlight unit, respectively. The first color light, the second color light, and the third color light are filtered.

Compared with the prior art, the display device of the present invention has the following advantages/effects:

(1) The display device of the present invention can adopt the red, green, and blue light-emitting diode (LED) backlight units to independently emit light and cooperate with local dimming to improve its performance. The color saturation of the display screen;

(2) Since the luminous efficiency of red and green LED backlight units is generally poor, the display device of the present invention can also add white light emitting LED backlight units to mix with red, green and blue light, which can be used in brightness mode Increase the intensity of white light to increase the brightness of the display screen, and reduce the intensity of white light in the color mode to increase the color saturation of the display screen; and

(3) In the color mode, when the display screen is biased to blue, the display device of the present invention will reduce the luminous intensity of the red and/or green LED backlight unit; when the display screen is biased to green, the display device of the present invention will decrease The luminous intensity of the red and/or blue LED backlight unit can improve the color saturation of the display screen.

The advantages and spirit of the present invention can be further understood from the following detailed description of the invention and the accompanying drawings.

Reference will now be made in detail to the exemplary embodiments of the present invention, and examples of the exemplary embodiments are illustrated in the accompanying drawings. Elements/components with the same or similar numbers used in the drawings and embodiments are used to represent the same or similar parts.

A specific embodiment according to the present invention is a display device. Please refer to FIG. 2A. FIG. 2A is a schematic diagram of the display device in this embodiment.

As shown in FIG. 2A, the display device DP includes a color filter CF, a first backlight unit R, a second backlight unit G, and a third backlight unit B. The first backlight unit R, the second backlight unit G, and the third backlight unit B are disposed relative to the color filter CF. The color filter CF includes a first filter area CF1, a second filter area CF2, and a third filter area CF3, corresponding to the first backlight unit R, the second backlight unit G, and the third backlight unit B, respectively. The first backlight unit R, the second backlight unit G, and the third backlight unit B are independently controlled. In other words, the first backlight unit R, the second backlight unit G, and the third backlight unit B emit light independently, and there is no correlation between them.

It should be noted that in practical applications, the color filter CF can also include a thin film transistor layer and a liquid crystal layer, and the size of the first backlight unit R, the second backlight unit G, and the third backlight unit B can be larger than a single picture. The size of the first filter region R1, the second filter region G1, and the third filter region B1 in the element, that is, the sizes of the first backlight unit R, the second backlight unit G, and the third backlight unit B can be different Pixel level, but not limited to this. The detailed situation will be explained later, and will not be repeated here.

As shown in FIG. 2B, when the first backlight unit R, the second backlight unit G, and the third backlight unit B respectively emit the first color light LR, the second color light LG, and the third color light LB to the first color filter CF. When the filter area CF1, the second filter area CF2, and the third filter area CF3, the first filter area CF1, the second filter area CF2, and the third filter area CF3 are The dichroic light LG and the third color light LB are filtered to provide the display panel after filtering out the remaining unnecessary spectrum.

For example, the first backlight unit R, the second backlight unit G, and the third backlight unit B can be a red light emitting diode (LED) backlight unit, a green LED backlight unit, and a blue LED backlight unit, respectively. The first color light LR, the second color light LG, and the third color light LB emitted by a backlight unit R, a second backlight unit G, and a third backlight unit B are red light, green light, and blue light, respectively, and a color filter CF The first filter area CF1, the second filter area CF2, and the third filter area CF3 are respectively a red filter area, a green filter area, and a blue filter area, which are used to compare the first color light LR( Red light), second color light LG (green light), and third color light LB (blue light) are filtered to filter out the remaining unnecessary spectrum and provide it to the display panel, but not limited to this.

In practical applications, the display device DP can be operated in a brightness mode or a color mode. In the brightness mode, it is assumed that the first color light LR, the second color light LG, and the third color light LB emitted by the first backlight unit R, the second backlight unit G, and the third backlight unit B have the first intensity and the second intensity, respectively And the third intensity (for example, the arrows corresponding to the first color light LR, the second color light LG, and the third color light LB in FIG. 2B).

In the color mode, when the display image of the display device DP shifts to the third color (ie blue) corresponding to the third color light LB, the display device DP will reduce the first color light LR emitted by the first backlight unit R At least one of the first intensity (that is, red light) and the second intensity of the second color light LG (that is, green light) emitted by the second backlight unit G.

For example, the display device DP can simultaneously reduce the first intensity of the first color light LR (ie red light) emitted by the first backlight unit R and the second color light LG (ie green light) emitted by the second backlight unit G. The second intensity of light), for example, is shown by the shortened arrows corresponding to the first color light LR (that is, red light) and the second color light LG (that is, green light) in FIG. 3A.

In addition, the display device DP can also only reduce the first intensity of the first color light LR (that is, red light) emitted by the first backlight unit R, for example, corresponding to the first color light LR (that is, red light) in FIG. 3B As shown by the shortening of the arrow, or the display device DP only reduces the second intensity of the second color light LG (ie green light) emitted by the second backlight unit G, for example, in FIG. 3C corresponding to the second color light LG (ie green light) ) The arrow is shortened as shown.

It should be noted that through the above-mentioned method of reducing the intensity of red light emitted by the first backlight unit R and/or the intensity of green light emitted by the second backlight unit G, as shown in FIG. 3D, when the display device of the present invention displays blue The green light will not leak out as shown in Fig. 1A during the color picture, so the color saturation of the display picture can be effectively improved.

Similarly, in the color mode, when the display screen of the display device deviates to the second color (ie green) corresponding to the second color light LG, the display device DP will reduce the first color light emitted by the first backlight unit R At least one of the first intensity of LR (ie, red light) and the third intensity of third color light LB (ie, blue light) emitted by the third backlight unit B.

For example, the display device DP can simultaneously reduce the first intensity of the first color light LR (i.e. red light) emitted by the first backlight unit R and the third color light LB (i.e. blue light) emitted by the third backlight unit B. ), for example, as shown by the shortened arrows corresponding to the first color light LR (ie, red light) and the third color light LB (ie, blue light) in FIG. 4A.

In addition, the display device DP can also only reduce the first intensity of the first color light LR (that is, red light) emitted by the first backlight unit R, for example, in FIG. 4B corresponding to the first color light LR (that is, red light) As shown by the shortened arrow, or the display device DP only reduces the third intensity of the third color light LB (that is, blue light) emitted by the third backlight unit B, for example, the third color light LB (that is, blue light) in FIG. 4C The arrow shortens as shown.

It should be noted that through the above-mentioned method of reducing the intensity of red light emitted by the first backlight unit R and/or the intensity of blue light emitted by the third backlight unit B, as shown in FIG. 4D, when the display device of the present invention displays a green screen The red light and blue light will not leak out as shown in FIG. 1B, so the color saturation of the display screen can be effectively improved.

In practical applications, the display screen of the display device may include a plurality of display areas, and different display areas may correspond to the same display mode or different display modes, depending on actual needs. For example, as shown in FIG. 5, the display frame DA includes a first display area A1 to a fourth display area A4, wherein the first display area A1 and the second display area A2 can respectively correspond to the color mode and the brightness mode, but not Limited by this.

In one embodiment, as shown in FIG. 6A and FIG. 6B, in the color mode, when the first display area A1 in the display screen displays red (R), the display device DP may only have the first display area corresponding to the red color (R). The backlight unit R independently emits the first color light LR (that is, red light) to the first filter area CF1 of the color filter CF (that is, the second backlight unit G corresponding to green and the third backlight unit G corresponding to blue) Unit B may not emit light), and then pass through the first filter area CF1 to filter out the spectrum other than red light and provide it to the display panel, so as to effectively increase the color saturation of the first display area A1 in the display screen when displaying red. In fact, the second backlight unit G can also emit the second color light LG (ie, green light) and/or the third backlight unit B can also emit the third color light LB (ie, blue light), and there is no specific limitation.

In another embodiment, as shown in FIG. 7A and FIG. 7B, in the color mode, when the first display area A1 in the display screen displays green (G), the display device DP may only have the first display area corresponding to the green color (G). The two backlight units G independently emit the second color light LG (that is, green light) to the second filter area CF2 of the color filter CF (that is, the first backlight unit R corresponding to red and the third backlight unit R corresponding to blue). Unit B may not emit light), and then pass through the second filter area CF2 to filter out the spectrum other than green light and provide it to the display panel, so as to effectively increase the color saturation of the first display area A1 in the display screen when green is displayed. In fact, the first backlight unit R can also emit the first color light LR (ie, red light) and/or the third backlight unit B can also emit the third color light LB (ie, blue light), and there is no specific limitation.

In another embodiment, as shown in FIG. 8A and FIG. 8B, in the color mode, when the first display area A1 in the display screen displays blue (B), the display device DP can only be displayed in blue (B). The third backlight unit B independently emits the third color light LB (that is, blue light) to the third filter area CF3 of the color filter CF (that is, the first backlight unit R corresponding to red and the second backlight unit R corresponding to green The unit G may not emit light), and then pass through the third filter area CF3 to filter out the spectrum other than blue light and provide it to the display panel, so as to effectively increase the color saturation of the first display area A1 in the display screen when displaying blue. In fact, the first backlight unit R can also emit the first color light LR (ie, red light) and/or the second backlight unit G can also emit the second color light LG (ie, green light), and there is no specific limitation.

In practical applications, when the first display image change occurs in the first display area A1 in the display image, the first backlight unit R, the second backlight unit G, and the third backlight unit B can be adjusted correspondingly according to the first dimming mode It emits at least one of the first color light LR, the second color light LG, and the third color light LB. Wherein, the first dimming mode can correspond to the first display screen change, and is used to adjust the chroma of at least one of the first color light LR, the second color light LG, and the third color light LB, but is not limited to this.

For example, if the first display screen appearing in the first display area A1 changes from the red screen shown in FIG. 6A to the green screen shown in FIG. 7A, the first backlight unit R, the second backlight unit G, and the The third backlight unit B can adjust the chroma of the first color light LR, the second color light LG, and the third color light LB corresponding to the first dimming mode corresponding to the first display screen change, for example, as shown in FIG. 6B It is shown that only the first backlight unit R independently emits the first color light LR (that is, red light) becomes as shown in FIG. 7B only the second backlight unit G independently emits the second color light LG (that is, green light), But not limited to this.

Similarly, if the second display screen appearing in the first display area A1 changes from the blue screen shown in FIG. 8A to the red screen shown in FIG. 6A, the first backlight unit R, the second backlight unit G, and the The third backlight unit B can adjust the chroma of the first color light LR, the second color light LG, and the third color light LB corresponding to the second dimming mode corresponding to the change of the second display screen, for example, as shown in FIG. 8B It is shown that only the third backlight unit B independently emits the third color light LB (that is, blue light) becomes the first backlight unit R that only independently emits the first color light LR (that is, red light) as shown in FIG. 6B, but Not limited to this.

Next, please refer to FIG. 9A. FIG. 9A illustrates a schematic diagram of a display device including a color filter and a first backlight unit to a fourth backlight unit that emit light independently in another embodiment of the present invention.

As shown in FIG. 9A, the display device DP includes a color filter CF, a first backlight unit R, a second backlight unit G, a third backlight unit B, and a fourth backlight unit W. The first backlight unit R, the second backlight unit G, the third backlight unit B, and the fourth backlight unit W are disposed relative to the color filter CF. The color filter CF includes a first filter area CF1, a second filter area CF2, a third filter area CF3, and a fourth filter area CF4, respectively corresponding to the first backlight unit R, the second backlight unit G, and the Three backlight unit B and fourth backlight unit W. The first backlight unit R, the second backlight unit G, the third backlight unit B, and the fourth backlight unit W are independently controlled. In other words, the first backlight unit R, the second backlight unit G, the third backlight unit B, and the fourth backlight unit W emit light independently, and there is no correlation between them.

As shown in FIG. 9B, when the first backlight unit R, the second backlight unit G, the third backlight unit B, and the fourth backlight unit W respectively emit the first color light LR, the second color light LG, the third color light LB, and the fourth color light. When the color light LW reaches the first filter area CF1, the second filter area CF2, the third filter area CF3, and the fourth filter area CF4 of the color filter CF, the first filter area CF1 and the second filter area CF2, the third filter area CF3 and the fourth filter area CF4 will filter the first color light LR, the second color light LG, the third color light LB and the fourth color light LW respectively to filter the remaining unwanted spectrum After being divided, it is provided to the display panel, so that the display screen displays the mixed light of the first color light LR, the second color light LG, the third color light LB, and the fourth color light LW.

For example, the first backlight unit R, the second backlight unit G, the third backlight unit B, and the fourth backlight unit W can be a red backlight unit, a green backlight unit, a blue backlight unit, and a white backlight unit, respectively. The first color light LR, the second color light LG, the third color light LB, and the fourth color light LW emitted by a backlight unit R, a second backlight unit G, a third backlight unit B, and a fourth backlight unit W are red light, Green light, blue light and white light, and the first filter area CF1, second filter area CF2, third filter area CF3 and fourth filter area CF4 of the color filter CF are red light filter area and green light filter area respectively. The light filter area, the blue light filter area, and the white light filter area are used to separate the first color light LR (red light), the second color light LG (green light), the third color light LB (blue light), and the fourth color light LW. (White light) filtering, but not limited to this.

It should be noted that the luminous efficiency of the first backlight unit R corresponding to red and the second backlight unit G corresponding to green are generally poor. Therefore, the display device DP of this embodiment may further add a fourth backlight unit emitting white light. W, the fourth backlight unit W can emit fourth color light LW (white light) of different intensities according to different display modes or display screen changes to interact with the first backlight unit R, the second backlight unit G, and the third backlight unit B. The first color light LR (red light), the second color light LG (green light), and the third color light LB (blue light) are mixed.

For example, in the brightness mode, in order to increase the brightness of the display screen, the fourth backlight unit W can increase the intensity of the fourth color light LW (white light) it emits, but it is not limited to this; in the color mode, in order to increase For the color saturation of the display screen, the fourth backlight unit W can reduce the intensity of the fourth color light LW (white light) emitted by the fourth backlight unit W, but it is not limited to this.

When the first display image change occurs in the first display area A1, the fourth backlight unit W can selectively adjust the brightness of the fourth color light LW (white light) it emits according to the first dimming mode corresponding to the first display image change , But not limited to this.

In one embodiment, when the first display screen changes to increase the brightness of the display screen, for example, the blue (B) screen displayed in the first display area A1 becomes brighter (as shown in FIGS. 10A to 10B), and the fourth backlight The unit W can increase the intensity of the white light LW emitted by the unit W according to the first dimming mode corresponding to the first display screen change (as shown by the thickened arrow corresponding to the white light LW in FIG. 10C), but it is not limited thereto. In addition, the display device DP can simultaneously reduce the chroma of at least one of the first color light LR (red light), the second color light LG (green light), and the third color light LB (blue light) according to the first dimming mode. But not limited to this.

In another embodiment, when the first display screen changes to reduce the brightness of the display screen, for example, the blue (B) screen displayed in the first display area A1 becomes dark (as shown in FIGS. 11A to 11B), The four backlight unit W can reduce the intensity of the white light LW it emits according to the first dimming mode corresponding to the first display screen change (as shown by the arrow corresponding to the white light LW in FIG. 11C turned into a broken line), but not as limit. In addition, the display device DP can simultaneously increase the chroma of at least one of the first color light LR (red light), the second color light LG (green light), and the third color light LB (blue light) according to the first dimming mode. To increase the color saturation of the display screen, but not limited to this.

It should be noted that although the above embodiment takes the first display area A1 of the display screen DA to display a blue screen as an example for description, it is not limited to this, and other display areas of the display screen DA (for example, the second display area A2) To the fourth display area A4) displaying pictures of other colors (for example, red or green) can also be deduced by analogy, which will not be repeated here.

Next, please refer to FIG. 12A and FIG. 12B. Comparing FIGS. 12A and 12B, it can be seen that a display screen with poor color saturation (such as shown in FIG. 12A) can effectively increase the color saturation of the display screen (such as shown in FIG. 12B) after the above dimming.

Referring to FIG. 13, in one embodiment, the color filter CF in the display device DP of the present invention may include a thin film transistor layer TFT, a liquid crystal layer LC, and a color filter layer CFL. The control circuit CON in the display device DP is electrically connected to the thin film transistor layer TFT for controlling the rotation angle of the liquid crystal in the liquid crystal layer LC.

Taking the first pixel PX1 in FIG. 13 as an example, the thin film transistor layer TFT includes a first thin film transistor TR1, a second thin film transistor TG1, and a third thin film transistor TB1. The liquid crystal layer LC includes a first liquid crystal region LR1, a second liquid crystal region LG1, and a third liquid crystal region LB1. The color filter layer CFL includes a first filter area R1, a second filter area G1, and a third filter area B1. Among them, the first thin film transistor TR1 corresponds to the first liquid crystal region LR1 and the first filter region R1; the second thin film transistor TG1 corresponds to the second liquid crystal region LG1 and the second filter region G1; the third thin film transistor TB1 Corresponding to the third liquid crystal area LB1 and the third filter area B1.

The control circuit CON can control the rotation angle of the first liquid crystal region LR1 through the first thin film transistor TR1, thereby adjusting the intensity of the first color light LR that can enter the first filter region R1. Similarly, the control circuit CON can control the rotation angle of the second liquid crystal region LG1 through the second thin film transistor TG1, thereby adjusting the intensity of the second color light LG that can enter the second filter region G1. The control circuit CON can control the rotation angle of the third liquid crystal area LB1 through the third thin film transistor TB1, thereby adjusting the intensity of the third color light LB that can enter the third filter area B1. In fact, the rotation angles of the first liquid crystal area LR1, the second liquid crystal area LG1 and the third liquid crystal area LB1 are adjusted according to the condition of the display screen of the display device to determine the color of the display screen.

In one embodiment, the size of the first backlight unit R, the second backlight unit G, and the third backlight unit B may be larger than the first filter region R1, the second filter region G1, and the third filter region in the first pixel PX1. The size of the filter area B1, that is, the sizes of the first backlight unit R, the second backlight unit G, and the third backlight unit B are not pixel levels, but not limited thereto.

In another embodiment, the sizes of the first backlight unit R, the second backlight unit G, and the third backlight unit B can also be equal to the first filter region R1, the second filter region G1, and the first pixel PX1. The size of the third filter area B1, that is, the size of the first backlight unit R, the second backlight unit G, and the third backlight unit B can be pixel levels, but is not limited thereto.

Next, please refer to Figure 14. As shown in FIG. 14, the sizes of the first backlight unit R, the second backlight unit G, and the third backlight unit B2 are not pixel levels, and the first backlight unit R, the second backlight unit G, and the third backlight unit B2 correspond to The first pixel PX1 to the third pixel PX3. In the color mode, when the display screen of the display device DP is bluish, only the third backlight unit B can emit the third color light LB (that is, blue light) to the first pixel PX1 to the third pixel PX3, and the first The backlight unit R and the second backlight unit G do not emit light. The control circuit CON can control the rotation of the third liquid crystal regions LB1~LB3 in the first pixel PX1 to the third pixel PX3 through the third thin film transistors TB1~TB3 in the first pixel PX1 to the third pixel PX3, respectively The angle is the largest, so that the third color light LB (that is, blue light) can respectively enter the third filter regions B1 to B3 of the first pixel PX1 to the third pixel PX3 for filtering.

In another embodiment, as shown in FIG. 15, in the color mode, when the display screen of the display device DP is blue, the first backlight unit R, the second backlight unit G, and the third backlight unit B respectively emit first The color light LR, the second color light LG and the third color light LB, wherein the third color light LB (that is, blue light) has a third intensity greater than the first intensity of the first color light LR and the second intensity of the second color light LG. That is, compared to the first color light LR emitted by the first backlight unit R and the second color light LG emitted by the second backlight unit G, the third color light LB (that is, blue light) emitted by the third backlight unit B is the strongest . Since the display screen of the display device DP is blue, the control circuit CON can control the first pixel PX1 to the third pixel PX3 through the third thin film transistors TB1 to TB3 in the first pixel PX1 to the third pixel PX3, respectively The rotation angle of the third liquid crystal area LB1~LB3 is the largest, so that the third color light LB (that is, blue light) can respectively enter the third filter area B1~B3 of the first pixel PX1 to the third pixel PX3. Filter light.

It should be noted that for the first pixel PX1 in FIG. 15, the control circuit CON can adjust the first pixel PX1 through the first thin film transistor TR1 and the second thin film transistor TG1 in the first pixel PX1. The rotation angle of the first liquid crystal area LR1 and the second liquid crystal area LG1 is the smallest, so that the first color light LR emitted by the first backlight unit R and the second color light LG emitted by the second backlight unit G cannot enter the first The first filter area R1 and the second filter area G1 in a pixel PX1 filter light, so the color of the display screen of the display device DP is pure blue without red or green components.

For the second pixel PX2 in FIG. 15, the control circuit CON can adjust the first liquid crystal in the second pixel PX2 through the first thin film transistor TR2 and the second thin film transistor TG2 in the second pixel PX2. The rotation angles of the area LR2 and the second liquid crystal area LG2 enable the first color light LR emitted by the first backlight unit R and the second color light LG emitted by the second backlight unit G to partially enter the second pixel PX2. The first filter area R2 and the second filter area G2 filter light, so the color of the display screen of the display device DP is bluish but still has red and green components, and the second intensity of the second color light LG It can be greater than the first intensity of the first color light LR, or the first intensity of the first color light LR is greater than the second intensity of the second color light LG, depending on the picture.

Similarly, for the third pixel PX3 in FIG. 15, the control circuit CON can adjust the third pixel PX3 through the first thin film transistor TR3 and the second thin film transistor TG3 in the third pixel PX3. The rotation angles of the first liquid crystal area LR3 and the second liquid crystal area LG3 enable the first color light LR emitted by the first backlight unit R and the second color light LG emitted by the second backlight unit G to enter the third color light respectively. The first filter area R3 and the second filter area G3 in the pixel PX3 filter light, so the display image of the display device DP is bluish but still has red and green components, and the second color light LG The second intensity can be greater than the first intensity of the first color light LR, or the first intensity of the first color light LR is greater than the second intensity of the second color light LG, depending on the picture.

Comparing the second pixel PX2 and the third pixel PX3 in FIG. 15 we can see that the rotation angles of the first liquid crystal region LR2 and the second liquid crystal region LG2 in the second pixel PX2 are different from those of the third pixel PX3. The rotation angle of a liquid crystal area LR3 and a second liquid crystal area LG3 makes the first intensity of the first color light LR and the second intensity of the second color light LG in the second pixel PX2 different from those in the third pixel PX3 The first intensity of the first color light LR and the second intensity of the second color light LG. In this embodiment, the first intensity of the first color light LR and the second intensity of the second color light LG in the second pixel PX2 are smaller than the first intensity and the second intensity of the first color light LR in the third pixel PX3 The second intensity of the dichromatic light LG, but not limited to this.

Next, please refer to Figure 16. As shown in FIG. 16, in the brightness mode, the first color light LR emitted by the first backlight unit R, the second color light LG emitted by the second backlight unit G, and the third color light LB emitted by the third backlight unit B It can be mixed into white light before entering the color filter CF, and the first color light LR (ie red light), the second color light LG (ie green light) and the first pixel PX1 to the third pixel PX3 The composition of the third color light LB (that is, blue light) is composed of the first pixel PX1 to the third pixel PX3 in the first liquid crystal region LR1~LR3, the second liquid crystal region LG1~LG3, and the third liquid crystal region LB1~LB3 The rotation angle is determined, so it can be adjusted according to the situation of the screen.

Compared with the prior art, the display device of the present invention has the following advantages/effects:

(1) The display device of the present invention can use red, green, and blue light-emitting diode (LED) backlight units to emit light independently and with local dimming, thereby improving the color saturation of the display screen Spend;

(2) Since the luminous efficiency of red and green LED backlight units is generally poor, the display device of the present invention can add white light emitting LED backlight units to mix with red, green and blue light, which can be increased in brightness mode The intensity of white light to increase the brightness of the display screen, and the intensity of white light can be reduced in the color mode to increase the color saturation of the display screen; and

(3) In the color mode, when the display screen is biased to blue, the display device of the present invention will reduce the luminous intensity of the red and/or green LED backlight unit; when the display screen is biased to green, the display device of the present invention will decrease The luminous intensity of the red and/or blue LED backlight unit can improve the color saturation of the display screen.

DP: display device

R: The first backlight unit

G: second backlight unit

B: The third backlight unit

W: Fourth backlight unit

CF: Color filter

CF1: First filter zone

CF2: second filter zone

CF3: Third filter zone

CF4: The fourth filter zone

LR: First color light

LG: second color light

LB: third color light

LW: fourth color light

DA: display screen

A1: The first display area

A2: Second display area

A3: The third display area

A4: The fourth display area

CFL: Color filter layer

LC: liquid crystal layer

TFT: Thin film transistor layer

CON: Control circuit

PX1: the first pixel

PX2: second pixel

PX3: third pixel

R1~R3: the first filter zone

G1~G3: second filter zone

B1~B3: third filter zone

LR1~LR3: The first liquid crystal area

LG1~LG3: The second LCD area

LB1~LB3: The third liquid crystal area

TR1~TR3: the first thin film transistor

TG1~TG3: the second thin film transistor

TB1~TB3: the third thin film transistor

The drawings of the present invention are described as follows: 1A and FIG. 1B are schematic diagrams respectively showing that when a traditional liquid crystal display screen displays a blue screen, a little green light is still leaked, and a little blue and red light is still leaked when a green screen is displayed. 2A shows a schematic diagram of a display device including a color filter and a first backlight unit to a third backlight unit that emit light independently, respectively, in a specific embodiment of the present invention. FIG. 2B illustrates a schematic diagram of the first backlight unit to the third backlight unit in the display device emitting light at the same time. 3A illustrates a schematic diagram of simultaneously reducing the first intensity of the first color light emitted by the first backlight unit and the second intensity of the second color light emitted by the second backlight unit. FIG. 3B illustrates a schematic diagram of only reducing the first intensity of the first color light emitted by the first backlight unit. FIG. 3C illustrates a schematic diagram of only reducing the second intensity of the second color light emitted by the second backlight unit. 3D is a schematic diagram showing that the display device of the present invention does not leak green light when displaying a blue screen. 4A illustrates a schematic diagram of simultaneously reducing the first intensity of the first color light emitted by the first backlight unit and the third intensity of the third color light emitted by the third backlight unit. FIG. 4B illustrates a schematic diagram of only reducing the first intensity of the first color light emitted by the first backlight unit. 4C illustrates a schematic diagram of only reducing the third intensity of the third color light emitted by the third backlight unit. 4D is a schematic diagram showing that the display device of the present invention does not leak red light and blue light when displaying a green screen. FIG. 5 is a schematic diagram of the display screen of the display device of the present invention including a plurality of display areas. FIG. 6A illustrates a schematic diagram of a red screen displayed in the first display area of the display screen. FIG. 6B illustrates a schematic diagram of the display device only emitting red light independently by the first backlight unit. FIG. 7A illustrates a schematic diagram of a green screen displayed in the first display area of the display screen. FIG. 7B illustrates a schematic diagram of the display device only emitting green light independently by the second backlight unit. FIG. 8A illustrates a schematic diagram of a blue screen displayed in the first display area of the display screen. FIG. 8B illustrates a schematic diagram of the display device only emitting blue light independently by the third backlight unit. FIG. 9A is a schematic diagram illustrating a display device in another embodiment of the present invention including color filters and first to fourth backlight units that emit light independently. FIG. 9B illustrates a schematic diagram of the first backlight unit to the fourth backlight unit in the display device emitting light at the same time. 10A and 10B are schematic diagrams showing that the blue screen displayed in the first display area becomes brighter. FIG. 10C illustrates a schematic diagram of increasing the intensity of white light emitted by the fourth backlight unit. 11A and 11B are schematic diagrams showing the darkening of the blue screen displayed in the first display area. FIG. 11C illustrates a schematic diagram of reducing the intensity of white light emitted by the fourth backlight unit. 12A and FIG. 12B are schematic diagrams showing that the original display screen with poor color saturation can be significantly improved after dimming by the display device of the present invention. FIG. 13 is a schematic diagram of the color filter of the present invention including a thin film transistor layer, a liquid crystal layer, and a color filter layer, and the control circuit is electrically connected to the thin film transistor layer. FIG. 14 is a schematic diagram showing that only the third backlight unit emits the third color light and the corresponding liquid crystal rotation angle is the largest when the display screen is blue in the color mode. FIG. 15 is a schematic diagram showing the strongest third color light emitted by the third backlight unit and the largest rotation angle of the corresponding liquid crystal when the display screen becomes blue in the color mode. Figure 16 shows that in the brightness mode, the first color light, the second color light and the third color light can be mixed into white light before entering the color filter. The red light, green light and light in the first pixel to the third pixel The composition of blue light is a schematic diagram determined by the rotation angle of the liquid crystal.

DP: display device

R: The first backlight unit

G: second backlight unit

B: The third backlight unit

CF: Color filter

CF1: First filter zone

CF2: second filter zone

CF3: Third filter zone

LR: First color light

LG: second color light

LB: third color light

Claims (18)

A display device includes: a color filter; and a first backlight unit, a second backlight unit, and a third backlight unit, which are arranged relative to the color filter and each independently emit a first color light and a The second color light and a third color light to the color filter; wherein, in a brightness mode, the first color light has a first intensity, the second color light has a second intensity, and the third color light has a The third intensity; in a color mode, when a display screen of the display device deviates to a third color corresponding to the third color light, the display device reduces at least one of the first intensity and the second intensity . For the display device described in claim 1, wherein the third color light is blue light and the first color light and the second color light are red light and green light, respectively, and in the brightness mode, the first color light The light, the second color light and the third color light are mixed into white light before entering the color filter. For the display device described in claim 1, wherein in the color mode, when the display screen deviates to a second color corresponding to the second color light, the display device reduces the first intensity and the third At least one of the strengths. For the display device described in item 3 of the scope of patent application, wherein the first color light, the second color light, and the third color light are red, green, and blue light, respectively, and in the brightness mode, the first color light The light, the second color light and the third color light are mixed into white light before entering the color filter. As for the display device described in claim 1, wherein a first display area and a second display area of the display screen correspond to the color mode and the brightness mode, respectively. The display device described in item 5 of the scope of patent application further includes: a fourth backlight unit, which is arranged relative to the color filter and independently controlled to emit a fourth color light to cause the second display area to display The first color light, the second color light, the third color light, and the fourth color light are mixed. For the display device described in item 5 of the scope of patent application, when a first display screen change occurs in the first display area, the first backlight unit, the second backlight unit, and the third backlight unit are based on a first The dimming mode correspondingly adjusts at least one of the first color light, the second color light, and the third color light emitted by it. For the display device described in item 5 of the scope of patent application, when a second display screen change occurs in the second display area, the first backlight unit, the second backlight unit, and the third backlight unit are based on a second The dimming mode correspondingly adjusts at least one of the first color light, the second color light and the third color light emitted by it. As for the display device described in claim 1, wherein the color filter includes a first filter area, a second filter area, and a third filter area, respectively corresponding to the first backlight unit, The second backlight unit and the third backlight unit are used for filtering the first color light, the second color light and the third color light respectively. The display device described in claim 1, wherein the color filter includes a color filter layer, and the color filter layer includes a first filter area, a second filter area, and a third filter. Light zone, the size of the first backlight unit, the second backlight unit and the third backlight unit is larger than the size of the first filter zone, the second filter zone and the third filter zone. As for the display device described in claim 1, wherein the color filter includes a liquid crystal layer and a color filter layer, and the liquid crystal layer includes a first liquid crystal region and a second liquid crystal layer. Crystal area and a third liquid crystal area, the color filter layer includes a first filter area, a second filter area and a third filter area, respectively corresponding to the first liquid crystal area, the second liquid crystal area And the third liquid crystal area, when the display screen is biased toward the third color, the third intensity is greater than the first intensity and the second intensity, and the rotation angle of the third liquid crystal area is greater than that of the first liquid crystal area and the first liquid crystal area. The rotation angle of the second liquid crystal area, the rotation angle of the first liquid crystal area, the second liquid crystal area and the third liquid crystal area are adjusted according to the condition of the display screen to determine the color of the display screen. A display device includes: a color filter set corresponding to a display area of the display device; and a first backlight unit, a second backlight unit, and a third backlight unit, which are set relative to the color filter And each independently emits a first color light, a second color light, and a third color light to the color filter; wherein, when a first display screen change occurs in the display area, the first backlight unit, the second The backlight unit and the third backlight unit correspondingly adjust at least one of the first color light, the second color light, and the third color light that they emit according to a first dimming mode; when the first display screen changes to When increasing the brightness of the display screen, the first dimming mode also reduces the chroma of at least one of the first color light, the second color light, and the third color light; when the first display screen changes to decrease the brightness of the display screen At this time, the first dimming mode also increases the chroma of at least one of the first color light, the second color light, and the third color light. For the display device described in item 12 of the scope of patent application, the first dimming mode corresponds to the change of the first display screen for adjusting the first color light, the second color light, and the third color light. The chroma of at least one. For the display device described in item 12 of the scope of patent application, when a second display screen change occurs in the display area, the first backlight unit, the second backlight unit, and the third backlight unit are adjusted according to a second dimming The mode correspondingly adjusts at least one of the first color light, the second color light and the third color light it emits. For the display device described in item 14 of the scope of patent application, the second dimming mode corresponds to the change of the second display screen for adjusting the first color light, the second color light, and the third color light. The chroma of at least one. The display device described in item 12 of the scope of patent application further includes: a fourth backlight unit, which is arranged and independently controlled relative to the color filter to emit a fourth color light; wherein, when the display area appears When the first display image changes, the fourth backlight unit selectively adjusts the fourth color light emitted by the fourth backlight unit according to the first dimming mode. As for the display device described in claim 16, wherein the first dimming mode corresponds to the change of the first display screen for selectively adjusting the brightness of the fourth color light. As for the display device described in claim 12, the color filter includes a first filter area, a second filter area, and a third filter area, respectively corresponding to the first backlight unit, The second backlight unit and the third backlight unit are used for filtering the first color light, the second color light, and the third color light, respectively.

Images