CN101276104A - Transflective liquid crystal display and color pixels thereof - Google Patents

Abstract

The color pixel of the liquid crystal display panel comprises a first substrate, a second substrate and a liquid crystal layer positioned between the first substrate and the second substrate. A color filter layer is formed on the first substrate. The color filter layer comprises a first photoresist layer formed in the transmission region and the reflection region of the color pixel for filtering and blocking light outside a first wavelength range; a second photoresist layer formed in the reflective region of the color pixel for blocking light outside a second wavelength range different from the first wavelength range; and a hole region formed between the first photoresist layer and the second photoresist layer.

Description

Transflective liquid crystal display and its color pixels

technical field

The invention provides a liquid crystal display, especially a semi-transmissive and semi-reflective liquid crystal display and its color pixels.

Background technique

Please refer to FIG. 1 and FIG. 2 at the same time. FIG. 1 is an exploded schematic diagram of a transflective liquid crystal display 100 in the prior art, and FIG. 2 is a schematic diagram of a color pixel 200 of the liquid crystal display panel 110 in FIG. 1 . The liquid crystal display 100 includes a liquid crystal display panel 110 and a backlight module 120 . The liquid crystal display panel 110 usually includes a plurality of display pixels (or main pixels) for displaying images, and each display pixel is usually composed of at least three color pixels (also called sub-pixels), that is, red pixels, blue pixels and green pixels. As shown in the figure, the color pixel 200 is composed of a first substrate 210 , a second substrate 220 and a liquid crystal layer 230 , wherein the first substrate 210 and the second substrate 220 are light-transmitting substrates. A color filter layer 240 is formed on the first substrate 210, and the color filter layer 240 includes a photoresist 242 (such as red, blue or green photoresist), which is coated on the transmissive area 204 and the reflective area of the color pixel 200 202 , and the color filter layer 240 further includes an opening 244 , which is formed by removing the first photoresist 242 in part of the reflective area 202 of the color pixel 200 . An overcoat layer 250 (overcoat) is usually provided on the color filter layer 240 as a planarization layer. The second substrate 220 is disposed at a corresponding position facing the first substrate 210 , and the second substrate 220 is provided with a reflective layer 222 on the reflective area 202 of the color pixel 200 for reflecting light. The liquid crystal layer 230 is filled between the first substrate 210 and the second substrate 220. The liquid crystal layer 230 controls the amount of light passing through the liquid crystal layer 230 by changing the orientation of the liquid crystal. The thin film transistor switch 224 on the second substrate 220 A potential difference can be generated between the transparent electrodes 260 and 270 by applying a voltage to drive the liquid crystal in the liquid crystal layer 230 to rotate.

When the transflective liquid crystal display panel 110 is provided with a light source by the backlight module 120 to display images, the light generated by the backlight module 120 passes through the transmissive regions 204 of the color pixels 200 to display images. When the transflective liquid crystal display panel 110 is provided with a light source (such as sunlight) by the surrounding environment to display images, the liquid crystal display panel 110 uses the reflective layer 222 on the second substrate 220 to reflect the light of the surrounding environment to display image (the penetrating area 204 cannot display an image because it does not have a reflective layer), and in the prior art, the way of displaying an image using reflected light includes two light paths, that is, the first light path 281 and the first light path 281 in FIG. The second light path 282 . Taking the red pixel as an example, when light travels in the first light path 281, because the light passes through the red photoresist 242 of the color filter layer 240, the first light path 281 will display red light (the red photoresist is used to block light outside the red wavelength range), and when the light travels in the second light path 282, because the light passes through the hole region 244 and does not pass through the red photoresist 242 of the color filter layer 240, the second light path 282 will display White light (ambient light). The same goes for blue sub-pixels and green sub-pixels.

Please refer to FIG. 3 , which is a schematic diagram of the distribution range of the chromaticity of the red pixel in the CIE chromaticity coordinate diagram in the prior art. Continuing to take the above-mentioned red pixel as an example, the chromaticity of the red light displayed after the light passes through the first light path 281 is located at point A of the CIE chromaticity coordinate diagram, and the chromaticity of the white light displayed after the light passes through the second light path It is located at point B of the CIE chromaticity diagram, and the red pixel will display an image after mixing the red light of the first light path 281 and the white light of the second light path 282 in the reflection area 202 . Therefore, when using reflected light to display an image, the chromaticity range of the red pixel is between point A and point B.

However, in the design and manufacture process, the filter chromaticity required by the penetration region 204 of the color pixel 200 will be determined by a specific light source (such as a D65 light source, which is a white light source with a color temperature of 6500K), and then determine the first photoresist The type and thickness of the agent 242 should at least meet the requirements of customers (customers) or users (users) in the basic light source, that is, the backlight light source environment for pure indoor use. After the type and thickness of the first photoresist 242 have been determined, since they belong to the same forming process, the chromaticity of the reflective region 202 of the color pixel 200 can only be changed by adjusting the size of the hole area 244, and its chromaticity range can only be changed by adjusting the size of the hole area 244. Adjustment in one-dimensional space (for example, from point A to point B) often fails to further achieve the overall chromaticity (including the transmissive area 204 and the reflective area 202 ) required by customers or users. For example, if the chromaticity of the reflective region 202 calculated according to the overall chromaticity of the red pixel required by the customer should be located at point C of the CIE chromaticity coordinate diagram, but the chromaticity of the reflective region 202 of the red pixel in the prior art It can only be adjusted between point A and point B, and no matter how much the size of the hole area 244 is changed, the customer's requirement cannot be met. Therefore, the chromaticity of the conventional transflective liquid crystal display 100 in the reflective mode cannot be flexibly adjusted in design or manufacture to meet customer requirements.

Contents of the invention

Therefore, the main purpose of the present invention is to provide a transflective liquid crystal display and its color pixels to solve the above-mentioned problems.

The color pixel of the liquid crystal display panel of the present invention comprises a first substrate, a second substrate and a liquid crystal layer between the first substrate and the second substrate. A color filter layer is formed on the first substrate. The color filter layer includes a first photoresist layer, formed in the penetrating area and reflective area of the color pixel, used to filter and block light outside the first wavelength range; a second photoresist layer, formed in the reflection area of the color pixel a region for filtering and blocking light outside a second wavelength range different from the first wavelength range; and a hole region formed between the first photoresist layer and the second photoresist layer.

Description of drawings

FIG. 1 is a schematic diagram of a transflective liquid crystal display in the prior art;

FIG. 2 is a schematic diagram of color pixels of the liquid crystal display panel of FIG. 1;

3 is a schematic diagram of the distribution range of the chromaticity of the red pixel in the prior art in the CIE chromaticity coordinate diagram;

4 is a schematic diagram of a transflective liquid crystal display of the present invention;

FIG. 5 is a schematic diagram of color pixels of the liquid crystal display panel of FIG. 4;

6 is a schematic diagram of the distribution range of the chromaticity of the red pixel in the CIE chromaticity coordinate diagram of the present invention;

Fig. 7 is a schematic diagram of another color pixel filled with opacifying agent according to the present invention;

FIG. 8 is a schematic diagram of another embodiment of the present invention in which color pixels are filled with opacifying agents.

Detailed ways

Please refer to FIGS. 4 to 6 at the same time. FIG. 4 is an exploded schematic diagram of a transflective liquid crystal display 400 of the present invention. FIG. 5 is a schematic diagram of a color pixel 500 of the liquid crystal display panel 410 in FIG. 4 . Schematic diagram of the distribution range of the chromaticity of the invented red pixel in the CIE chromaticity coordinate diagram. As shown in the figure, the color pixel 500 of the liquid crystal display panel 410 of the present invention is also composed of a first substrate 510, a second substrate 520 and a liquid crystal layer 530, wherein the first substrate 510 and the second substrate 520 are light-transmitting substrates. Different from the prior art, the color filter layer 540 on the first substrate 510 includes a second photoresist 543 in addition to the first photoresist 542 . Since the second photoresist 543 is coated and formed in part of the original hole region of the reflective region 502 of the color pixel 500, the newly formed hole region 544 is located between the first photoresist 542 and the second photoresist. 543 (for example, surrounding the second photoresist 543). The first substrate 510 may also have a coating layer 550 coated on the color filter layer 540, and the second substrate 520 is arranged at a corresponding position facing the first substrate 510, and the second substrate 520 is located on the color pixel 500. A reflective layer 522 is disposed on the reflective area 502 to reflect light. The liquid crystal layer 530 is filled between the first substrate 510 and the second substrate 520 , and the twisting of the liquid crystal layer 530 is driven by the TFT switch 524 on the second substrate 520 by applying voltage.

When the transflective liquid crystal display panel 410 is provided with a light source by the backlight module 420 to display images, the light generated by the backlight module 420 passes through the transmissive regions 504 of the color pixels 500 to display images. When the transflective liquid crystal display panel 410 is provided with a light source (such as sunlight) by the surrounding environment to display images, the liquid crystal display panel 410 uses the reflective layer 522 of the second substrate 520 to reflect the light of the surrounding environment to display images. . However, in the present invention, the method of using reflected light to display images includes three light paths, that is, the first light path 581 , the second light path 582 and the third light path 583 in FIG. 5 . Taking a red pixel as an example (the first photoresist 542 is a red photoresist, and the second photoresist 543 is a blue photoresist), when the light travels in the first light path 581, since the light passes through the color filter layer 540 red photoresist, so the first light path 581 will display red light, when the light travels in the second light path 582, because the light passes through the hole area 544, the second light path 582 will display white light (ambient light) , and when the light travels in the third light path 583, because the light passes through the blue photoresist of the color filter layer 540, the third light path 583 will display blue light (the blue photoresist is used to block light outside the blue wavelength range. light).

As shown in FIG. 6, the chromaticity of the red light displayed after the light passes through the first light path 581 is located at point A of the CIE chromaticity coordinate diagram, and the chromaticity of the white light displayed after the light passes through the second light path is located at Point B of the CIE chromaticity coordinate diagram, and the chromaticity of the blue light displayed after the light passes through the third light path is located at point D of the CIE chromaticity coordinate diagram. The red pixel displays an image after mixing the red light of the first light path 581 , the white light of the second light path 582 and the blue light of the third light path 583 in the reflection area. Therefore, when using reflected light to display images, the adjustable range of the chromaticity of the red sub-pixel in the design or manufacturing stage of the present invention is between the triangle-shaped ranges of points A, B and D, that is, the red sub-pixel The adjustable range of the chromaticity is changed from the original one-dimensional space to the two-dimensional space, thereby greatly increasing the adjustable range of the chromaticity of the reflective region 502 of the color pixel 500 of the present invention.

Therefore, after determining the chromaticity of the transmissive region 504 of the red pixel 500 (that is, determining the type and thickness of the first photoresist 542), if the estimated reflective region 502 of the red pixel 500 according to the customer's requirements If the chromaticity is located at point C of the CIE chromaticity coordinate diagram, then the present invention can adjust the range size of the burrowing area 544 and the second photoresist 543 in the design or manufacturing stage, or adjust the burrowing area 544 and the second photoresist The ratio of the photoresist 543 to the first photoresist 542 or the ratio of the entire pixel to change the chromaticity of the reflective region 502 of the red pixel 500, so that its chromaticity is located at point C of the CIE chromaticity coordinate diagram to meet the specifications required by customers . Relatively, if the chromaticity of the reflective region 502 of the red pixel 500 required by the customer is located at point E of the CIE chromaticity coordinate diagram, the present invention can also change the type of the second photoresist, such as using a green photoresist, so that The chromaticity range of the reflective area 502 of the red pixel 500 is within the triangle-shaped range of point A, point B and point F. Referring to FIG. The principle and structure of the blue pixel and the green pixel of the present invention are also similar to the above red pixel, so no further description is given.

In addition, when the monochromatic chromaticity of the penetrating area of the red, blue, and green pixels all meets the customer's specifications, the white light displayed by the display pixels composed of the red, blue, and green pixels may still not be able to meet the requirements. Customer requirements specifications. For example, if the brightness of the red sub-pixel is higher, the white light displayed by the display pixel will be more reddish. Please refer to FIG. 7 and FIG. 8 at the same time. FIG. 7 is a schematic diagram of the color pixel 700 of the present invention filled with opacifier, and FIG. 8 is a schematic diagram of another embodiment of the color pixel 800 of the present invention filled with opacifier. Taking the above-mentioned red pixel as an example, if it is found that the brightness of the red pixel is higher (that is, the white light displayed by the display pixel will be reddish) after calculation and simulation or the test results of the manufactured sample, then the present invention can Simultaneously reduce the size of the filtering or light-transmitting range of the first photoresist 542, the second photoresist 543, and the hole area 544 in the reflective region 502 according to the original ratio. For example, a light shielding agent can be filled in to form a light shield as shown in FIG. 546 to block the light, or as shown in Figure 8, fill the corresponding ranges with opacifiers to form light shields 547, 548, 549 to block the light. In this way, the brightness of the red pixels will be reduced to restore the white light displayed by the display pixels to normal. The same goes for blue pixels and green pixels.

Compared with the prior art, the reflective regions 502 of the color pixels 500 and 700 of the transflective liquid crystal display 400 of the present invention have a two-dimensional chromaticity adjustment design range, so the color pixels 500 and 700 of the present invention Chroma has better flexibility for adjustment, and can easily meet the specifications required by customers and users.

The above descriptions are only preferred embodiments of the present invention, and all equal changes and amendments made according to the claims of the present invention shall fall within the scope of the present invention.

Claims (18)

1. the colour element of the display panels of a semi-penetration, semi-reflective comprises:

First substrate;

Chromatic filter layer is formed on this first substrate, comprises:

First photoresist layer is formed on the penetration region and the reflector space of this colour element, is used for filtering intercepting the outer light of first wavelength coverage;

Second photoresist layer is formed on the reflector space of this colour element, is used for filtering intercepting the outer light of second wavelength coverage that is different from this first wavelength coverage; And

The hole district is formed between this first photoresist layer and this second photoresist layer;

Second substrate is located at the opposite position of this first substrate subtend; And

Liquid crystal layer is between this first substrate and this second substrate.

2. colour element as claimed in claim 1, wherein this first substrate and this second substrate are transparent substrates.

3. colour element as claimed in claim 2 wherein forms thin film transistor switch on this second substrate in addition, is used for applying a voltage to this liquid crystal layer.

4. colour element as claimed in claim 2 wherein is formed on the reflection horizon of the reflector space of this colour element in addition on this second substrate, be used for reflection ray.

5. colour element as claimed in claim 1 wherein forms light shield on this chromatic filter layer in addition, is used for stopping that light passes through.

6. colour element as claimed in claim 2 wherein forms the overlay film layer on this chromatic filter layer in addition.

7. colour element as claimed in claim 1, wherein this first photoresist layer is to be used for filtering the extraneous light of obstruct red light wavelength.

8. colour element as claimed in claim 7, wherein this second photoresist layer is to be used for filtering the extraneous light of a kind of light wavelength that intercepts in green glow and the blue light.

9. colour element as claimed in claim 1, wherein this first photoresist layer is to be used for filtering the extraneous light of obstruct blue light wavelength.

10. colour element as claimed in claim 1, wherein this second photoresist layer is to be used for filtering the light that intercepts outside the green wavelength.

11. the LCD of a semi-penetration, semi-reflective, it comprises:

Display panels comprises:

First substrate;

Chromatic filter layer is formed on this first substrate, comprises:

A plurality of first photoresist layers are formed on a plurality of penetration region and a plurality of reflector space, are used for filtering the light that intercepts outside first wavelength coverage;

A plurality of second photoresist layers are formed on this a plurality of reflector spaces, are used for filtering the light that intercepts outside second wavelength coverage that is different from this first wavelength coverage; And

A plurality of holes district is formed between these a plurality of first photoresist layers and these a plurality of second photoresist layers;

Second substrate is located at the opposite position of this first substrate subtend; And

Liquid crystal layer is between this first substrate and this second substrate; And

Backlight module is arranged on a side of this display panels, is used for producing the penetration region of these a plurality of blocks of light penetration.

12. LCD as claimed in claim 11, wherein this first substrate and this second substrate are transparent substrates.

13. LCD as claimed in claim 12 wherein forms a plurality of thin film transistor switch on this second substrate in addition, is used for applying voltage at this liquid crystal layer.

14. LCD as claimed in claim 12 wherein is formed on a plurality of reflection horizon of these a plurality of reflector spaces in addition on this second substrate, be used for reflection ray.

15. LCD as claimed in claim 11 wherein forms a plurality of light shields on this chromatic filter layer in addition, is used for stopping that light passes through.

16. LCD as claimed in claim 11 wherein forms the overlay film layer on this chromatic filter layer in addition.

17. LCD as claimed in claim 11, wherein these a plurality of first photoresist layers are used for filtering the extraneous light of a kind of light wavelength that intercepts in ruddiness, blue light and the green glow.

18. LCD as claimed in claim 17, wherein these a plurality of second photoresist layers are used for filtering the extraneous light of a kind of light wavelength that intercepts in green glow, blue light and the ruddiness.

Images