STN display screen driving structure with high gradient

Abstract

The utility model relates to the technical field of STN products, in particular to a high-gradient STN display screen driving structure which comprises an upper polaroid, an upper glass substrate, a first P I orientation layer, a second P I orientation layer, a lower glass substrate and a lower polaroid which are arranged from top to bottom. The compensation value of the upper polaroid ranges from 500 nm to 700 nm, the slicing angle of the upper polaroid ranges from 15 degrees to 20 degrees, the pretilt angle of the first P I orientation layer and the pretilt angle of the second P I orientation layer range from 7 degrees to 8 degrees, the thickness of the first P I orientation layer and the thickness of the second P I orientation layer range from 500 A to 700 A, the thickness of a gap between the upper glass substrate and the lower glass substrate ranges from 5 micrometers to 7 micrometers, and the thickness of a gap between the upper glass substrate and the lower glass substrate ranges from 5 micrometers to 7 micrometers. According to the utility model, the problems of blurring or distortion of a displayed image, low contrast and poor display effect caused by non-uniform transition between pixel points due to voltage fluctuation and influence on gradient performance can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of STN products, in particular to a STN display screen driving structure with high steepness. Background Art

[0002] STN display screens are popular among users due to their wide viewing angle, high-channel display, positive and negative display, and low price. They have been the mainstream display products in recent years.

[0003] STN displays use a specific arrangement of liquid crystal molecules, which determines the transition state between pixels. The finer and more uniform the arrangement of the liquid crystal molecules, the smoother the transition of the display when displaying different gray levels, thus showing a higher steepness.

[0004] Although STN display screens have great advantages in terms of viewing angle range, high-channel display and price, voltage fluctuations have a great impact on the display effect of STN products. Voltage fluctuations may cause unstable arrangement of liquid crystal molecules. In STN display screens, the arrangement state of liquid crystal molecules is controlled by electric fields, and the magnitude of the electric field is directly affected by voltage. If the voltage is unstable, the change of the electric field will also be unstable, which will cause the arrangement state of liquid crystal molecules to fluctuate. This fluctuation will make the transition between pixels uneven, affect the steepness performance, and make the displayed image blurred or distorted, with low contrast and poor display effect, affecting customer use. The degree of voltage fluctuation is determined by the driving structure in the STN product. Therefore, it is an urgent problem to propose a STN display screen driving structure with high steepness. Utility Model Content

[0005] In order to solve the above problems, the utility model provides an STN display screen driving structure with high steepness. The utility model can solve the problem that the transition between pixel points becomes uneven due to voltage fluctuation, affects the steepness performance, makes the displayed image blurred or distorted, and causes low contrast and poor display effect.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A STN display screen driving structure with high steepness, comprising an upper polarizer, an upper glass substrate, a first PI orientation layer, a second PI orientation layer, a lower glass substrate and a lower polarizer arranged from top to bottom;

[0008] The compensation value of the upper polarizer is 500nm-700nm, the slicing angle of the upper polarizer is 15°-20°, the pretilt angle of the first PI orientation layer and the second PI orientation layer is 7°-8°, the thickness of the first PI orientation layer and the second PI orientation layer is 500A-700A, and the gap thickness between the upper glass substrate and the lower glass substrate is 5μm-7μm.

[0009] Preferably, the invention further comprises a liquid crystal layer, wherein the refractive index Δn of the liquid crystal layer is 0.13-0.16.

[0010] Preferably, a friction angle between the upper glass substrate and the lower glass substrate is 240°-250°.

[0011] Preferably, grooves are provided on the surface of the PI alignment layer.

[0012] Preferably, the PI orientation layer comprises a first PI orientation layer and a second PI orientation layer, wherein the first PI orientation layer is disposed on a side of the upper glass substrate close to the lower glass substrate, and the second PI orientation layer is disposed on a side of the lower glass substrate close to the upper glass substrate.

[0013] Preferably, the upper glass substrate is connected to the first PI alignment layer through an ITO conductive layer, and the lower glass substrate is connected to the second PI alignment layer through an ITO conductive layer.

[0014] Preferably, the liquid crystal layer is disposed between the first PI alignment layer and the second PI alignment layer, and core powder is disposed in the liquid crystal layer.

[0015] Preferably, the upper glass substrate is connected to the lower glass substrate via frame glue and silicon balls.

[0016] Preferably, it also includes a conductive gold ball, and the conductive gold ball is connected to the frame glue.

[0017] Preferably, a backlight panel is provided on a side of the lower glass substrate away from the upper glass substrate.

[0018] The beneficial effects of the utility model are:

[0019] 1. The utility model comprises an upper polarizer, an upper glass substrate, a PI orientation layer, a lower glass substrate and a lower polarizer which are arranged from top to bottom; the compensation value of the upper polarizer is 500nm-700nm, the slicing angle of the upper polarizer is 15°-20°, the pretilt angle of the first PI orientation layer and the second PI orientation layer is 7°-8°, the thickness of the first PI orientation layer and the second PI orientation layer is 500A-700A, the gap thickness between the upper glass substrate and the lower glass substrate is 5μm-7μm, and the steepness of the STN display screen is increased by optimizing the display screen driving structure, and the voltage fluctuation range of the whole machine is improved, which can solve the problem that the transition between pixel points becomes uneven due to voltage fluctuation, affects the steepness performance, makes the displayed image blurred or distorted, and has low contrast and poor display effect.

[0020] 2. The utility model improves the stability of voltage by optimizing the driving structure. The stable voltage supply avoids uneven character blackness and contrast changes caused by voltage fluctuations, making the steepness more accurate;

[0021] Stable voltage helps improve the overall image quality of the display. It avoids problems such as black flickering, dark areas or color distortion caused by unstable voltage, making the image clearer and more delicate, thereby improving the visual effect of steepness;

[0022] Voltage stability has a positive impact on the life of the display. Frequent voltage fluctuations may cause damage to the internal components of the display and accelerate the aging process, while stable voltage can reduce such damage and extend the service life of the display.

[0023] Voltage stabilization helps provide stable visual effects and reduces visual fatigue when users are viewing the display. This allows users to enjoy the visual experience brought by steep changes more comfortably, improving overall user satisfaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a structural diagram of the STN display screen in a specific embodiment of the utility model;

[0025] Figure 2 This is a diagram showing the relationship between STN display blackness and voltage in a specific embodiment of the present invention.

[0026] Explanation of the accompanying drawings: 1. upper polarizer; 2. upper glass substrate; 3. silicon ball; 4. frame glue; 5. lower glass substrate; 6. lower polarizer; 7. backlight; 8. center powder; 9. liquid crystal layer; 10. I TO conductive layer; 11. first PI orientation layer; 12. second PI orientation layer; 13. conductive gold ball. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] See also Figure 1-Figure 2 As shown, the utility model relates to a STN display screen driving structure with high steepness.

[0029] Example 1

[0030] A STN display screen driving structure with high steepness, comprising an upper polarizer 1, an upper glass substrate 2, a first PI orientation layer 11, a second PI orientation layer 12, a lower glass substrate 5 and a lower polarizer 6 arranged from top to bottom;

[0031] The compensation value of the upper polarizer 1 is 500nm-700nm, the slicing angle of the upper polarizer 1 is 15°-20°, the pretilt angles of the first PI orientation layer 11 and the second PI orientation layer 12 are 7°-8°, the thickness of the first PI orientation layer 11 and the second PI orientation layer 12 is 500A-700A, and the gap thickness between the upper glass substrate 2 and the lower glass substrate 5 is 5μm-7μm.

[0032] The driving structure also includes a liquid crystal layer 9, the refractive index Δn of the liquid crystal layer 9 is 0.13-0.16, and the refractive index of the liquid crystal layer 9 is an important parameter of its optical properties, describing the general refractive characteristics of light when propagating in the liquid crystal. The birefringence of the liquid crystal determines the optical properties of the liquid crystal display.

[0033] The rubbing angle is the angle position achieved by the polarizer when it is attached to the glass substrate through the rubbing process or other alignment methods. This angle is critical to ensure the normal operation and display performance of the LCD.

[0034] In the LCD manufacturing process, precise control of the rubbing angle is one of the key steps to ensure stable display quality, accurate color and high contrast. Different LCD designs and manufacturing processes may require different rubbing angle settings.

[0035] In the present application, the friction angle between the upper glass substrate 2 and the lower glass substrate 5 is 235°-240°, the upper glass substrate 2 is connected to the lower glass substrate 5 through the frame glue 4 and the silicon ball 3, the conductive gold ball 13 is connected to the frame glue 4, and a backlight panel 7 is provided on the side of the lower glass substrate 5 away from the upper glass substrate 2.

[0036] The main function of the backlight panel 7 is to provide a stable and uniform light source for the LCD screen. Since the LCD screen itself does not emit light, it needs to rely on the backlight panel 7 to illuminate the display content so that the user can clearly see the images and information on the screen.

[0037] The backlight panel 7 can adjust the darkness according to the ambient light and usage requirements. For example, when the ambient light is dim, the backlight panel 7 will automatically increase the darkness to provide a better visual experience; conversely, in an environment with strong light, the backlight panel 7 will appropriately reduce the darkness to avoid discomfort to the eyes caused by excessively bright light.

[0038] The performance of the backlight panel 7 also affects the color performance of the LCD screen. A high-quality backlight panel 7 can provide a wider and more accurate color range, making the displayed content more vivid and lifelike.

[0039] The PI orientation layer includes a first PI orientation layer 11 and a second PI orientation layer 12. The first PI orientation layer 11 is arranged on the side of the upper glass substrate 2 close to the lower glass substrate 5, and the second PI orientation layer 12 is arranged on the side of the lower glass substrate 5 close to the upper glass substrate 2. The liquid crystal layer 9 is arranged between the first PI orientation layer 11 and the second PI orientation layer 12, and a core powder 8 is arranged in the liquid crystal layer 9.

[0040] The PI oriented layer needs to be polished with a fine velvet cloth to rub out small grooves on its surface. The depth of the fine velvet cloth during friction is called the friction depression amount, which is set between 0.4mm-0.6mm. The fine velvet cloth used to polish the PI oriented layer usually has a nap length of 1.5mm-2.5mm.

[0041] The upper glass substrate 2 is connected to the first PI alignment layer 11 through an ITO conductive layer 10 , and the lower glass substrate 5 is connected to the second PI alignment layer 12 through an ITO conductive layer 10 .

[0042] Example 2

[0043] Based on the above embodiment 1, the design principle of this solution can be obtained. This solution is basically the same as a conventional LCD in structure, including an upper glass substrate 2, a lower glass substrate 5, a PI orientation layer, a center powder 8, a glue edge, a liquid crystal, and upper and lower polarizers 6. After the LCD is powered on, an electric field is formed between the upper and lower glasses. The magnitude of the electric field force is related to the voltage. The electric field force can control the arrangement direction of the liquid crystal molecules. The change in the arrangement direction of the liquid crystal molecules can change the propagation direction of polarized light (light vibrating in a certain direction). The upper and lower polarizers 6 are similar to gratings and can form polarized light. In this way, it is achieved to control whether light can reach the human eye through the polarizer by changing the voltage. As long as a pattern is etched on the ITO of the glass substrate, the corresponding information can be displayed, thereby achieving the purpose of display.

[0044] This solution mainly optimizes the upper polarizer 1 (polarizer compensation value, slicing angle), liquid crystal (liquid crystal steepness, liquid crystal delay), PI (PI pre-tilt angle, PI coating thickness, PI curing temperature), and friction process (friction cloth type, friction angle, friction depth) to improve the steepness of the product.

[0045] According to experimental verification, within a certain range, the greater the pretilt angle of the PI material, the better the steepness of the product; the thinner the thickness of the PI coating, the better the steepness of the product; the greater the angle formed by the friction direction of the upper glass substrate 2 and the lower glass substrate 5, the better the steepness of the product; the better the steepness of the liquid crystal material, the better the steepness of the product; the greater the slicing angle of the upper polarizer 1, the better the steepness of the product.

[0046] refer to Figure 2 As shown, the voltage window is determined by the driver module in the customer's machine. It is a voltage range that can be expressed by Von-Voff. The steepness of the product can be expressed by the value of V90-V10, where V90 is the voltage value corresponding to the maximum blackness of the product display characters of 90%, and V10 is the voltage value corresponding to the maximum blackness of the product display characters of 10%. When V90≤Von, V10≥Voff of the product, the product display is normal.

[0047] Currently, the steepness of the product is generally 0.17V. Although this can meet the voltage window of most products, when the voltage window range of the customer's whole machine drive is less than 0.17V, the product's voltage V10 or V90 will exceed the voltage window range, causing display abnormalities.

[0048] In order to control the voltage of this part of the product within a reasonable range, it is necessary to increase the steepness of the product. This application can increase the steepness of the product from 0.17 to 0.13V. The design scheme is as follows:

[0049] (1) The PI layer (polyimide) used for liquid crystal alignment has a pretilt angle of usually 7°-8°.

[0050] (2) The PI layer (polyimide) used for liquid crystal orientation has a film thickness usually set between 500A and 700A.

[0051] (3) The gap between the upper and lower glass, that is, the box thickness d, is 5.0μm-7.0μm.

[0052] (4) The PI oriented layer needs to be polished with a fine velvet cloth to rub out fine grooves on its surface. The depth of the fine velvet cloth during friction is called the friction indentation, which is set between 0.4 mm and 0.6 mm.

[0053] (5) The PI oriented layer needs to be polished with a fine velvet cloth to rub out fine grooves on its surface. The length of the fine velvet cloth is usually 2.0mm-3.0mm.

[0054] (6) The friction angle between the upper glass substrate 2 and the lower glass substrate 5 is between 240° and 250°.

[0055] (7) The refractive index Δn of the liquid crystal layer 9 is 0.13-0.16.

[0056] (8) The compensation value of the upper polarizer 1 is between 500 and 700.

[0057] (9) The slicing angle of the upper polarizer 1 is between 15° and 20°.

[0058] The above implementation modes are merely descriptions of the preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary engineering and technical personnel in the field shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A STN display screen driving structure with high steepness, characterized in that: It includes an upper polarizer, an upper glass substrate, a first PI alignment layer, a second PI alignment layer, a lower glass substrate and a lower polarizer arranged from top to bottom; The compensation value of the upper polarizer is 500nm-700nm, the slicing angle of the upper polarizer is 15°-20°, the pretilt angle of the first PI orientation layer and the second PI orientation layer is 7°-8°, the thickness of the first PI orientation layer and the second PI orientation layer is 500A-700A, and the gap thickness between the upper glass substrate and the lower glass substrate is 5μm-7μm.

2. The STN display screen driving structure with high steepness according to claim 1, characterized in that: It also includes a liquid crystal layer, wherein the refractive index Δn of the liquid crystal layer is 0.13-0.

16.

3. The STN display screen driving structure with high steepness according to claim 1, characterized in that: The friction angle between the upper glass substrate and the lower glass substrate is 240°-250°.

4. The STN display screen driving structure with high steepness according to claim 1, characterized in that: The surface of the PI alignment layer is provided with grooves.

5. The STN display screen driving structure with high steepness according to claim 2, characterized in that: The PI alignment layer includes a first PI alignment layer and a second PI alignment layer. The first PI alignment layer is disposed on a side of the upper glass substrate close to the lower glass substrate, and the second PI alignment layer is disposed on a side of the lower glass substrate close to the upper glass substrate.

6. The STN display screen driving structure with high steepness according to claim 5, characterized in that: The upper glass substrate is connected to the first PI alignment layer through an ITO conductive layer, and the lower glass substrate is connected to the second PI alignment layer through an ITO conductive layer.

7. The STN display screen driving structure with high steepness according to claim 5, characterized in that: The liquid crystal layer is arranged between the first PI alignment layer and the second PI alignment layer, and core powder is arranged in the liquid crystal layer.

8. The STN display screen driving structure with high steepness according to claim 1, characterized in that: The upper glass substrate is connected to the lower glass substrate through frame glue and silicon balls.

9. The STN display screen driving structure with high steepness according to claim 8, characterized in that: It also includes a conductive gold ball, which is connected to the frame.

10. The STN display screen driving structure with high steepness according to claim 1, characterized in that: A backlight plate is provided on a side of the lower glass substrate away from the upper glass substrate.

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