A rubbing process for a VA segment code liquid crystal display

Abstract

The application discloses a rubbing process of a VA segment code liquid crystal display and belongs to the technical field of display. The rubbing process is a double-viewing-angle rubbing process, and a high-transmittance symmetrical gray-scale liquid crystal display can be obtained. The application comprises the following steps: according to product requirements, a shielding piece is made and fixed on a rubbing device, and the shielding piece can simultaneously cover a viewing window area and a segment code area on one side; the shielding piece is used to cover the viewing window area and the segment code area on one side, a rubbing angle is set according to a viewing angle, and full-area rubbing is performed on an unshielded area, so that rubbing of left and right segment code areas is respectively completed, that is, double-viewing-angle rubbing is completed.

Description

Technical Field

[0001] This invention belongs to the field of display technology, and particularly relates to a friction process for a VA segment liquid crystal display. Background Technology

[0002] With the development of current technology, in-vehicle instruments are gradually replacing traditional pointer-type instruments and are developing towards intelligence, personalization, and integration. Among them, the combination instrument of large-size LCD display with small-size TFT display with VA segment code is constantly expanding its market share due to its cost advantage, flexible shape and good overall performance.

[0003] The VA segment code large-size LCD display combined with TFT instrument cluster is divided into two parts: the upper VA segment code large-size LCD display and the lower TFT module. The VA segment code large-size LCD display is set with left and right segment code sections and a middle TFT window section. The main body of the left segment code is the tachometer, the main body of the right segment code is the speedometer, and the content displayed in the middle TFT window section can be seen through the display of the lower TFT module.

[0004] To achieve multi-layered stereoscopic display of the VA segment code section, the segment code screen uses grayscale display, meaning some parts of the display have lower brightness. In this state, the brightness outside the viewing angle will be significantly reduced, causing inconsistency in grayscale brightness. The driver's line of sight is symmetrically distributed from the center of the TFT area to both sides, requiring the segment code screen to have a 12-point or 6-point viewing angle, that is, the absorption axis angle of the bottom polarizer of the segment code is 45° or -45°. However, the absorption axis angle of the surface polarizer of most TFTs is 0°, which causes the brightness of the lower TFT to decrease by 50% after passing through the segment code screen, causing the display of the middle TFT to be darker. Therefore, the segment code screen needs to adopt a 1:30 or 10.5-point viewing angle. If the product only has one viewing angle, the problem of inconsistent grayscale brightness still exists within the driver's line of sight. That is, the integrated segment code screen needs to set both 1:30 and 10:30 viewing angles on one side to meet the requirements.

[0005] The manufacturing process of VA segment LCD displays is divided into front-end and back-end processes. The front-end process mainly includes photolithography, TOP layer printing, PI alignment layer printing, friction, powder coating, and lamination. The TOP layer and alignment layer (PI) are printed onto ITO glass, currently using letterpress printing followed by high-temperature curing. The friction process involves using a friction machine on the PI layer of the glass. Cotton cloth is attached to the rollers of the friction machine, and the entire PI layer is rubbed at a fixed angle according to the product's viewing angle. Finally, it is completed through powder coating and lamination. Currently, the friction process rubs the entire surface of a glass panel in a fixed and uniform direction, allowing only one viewing angle for the product. Summary of the Invention

[0006] This invention provides a friction process for a VA segment liquid crystal display, which employs a dual-viewing-angle friction process to obtain a high-transmittance symmetrical grayscale liquid crystal display.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A friction process for a VA segment LCD display includes the following steps:

[0009] Step 1: Make a shielding plate according to product requirements and fix it on the friction device. The shielding plate can cover the viewing window area and one side of the segment code area at the same time.

[0010] Step 2: Use a masking plate to cover the viewing window area and one side of the segment code area. Set the friction angle according to the viewing angle and rub the entire uncovered area. Complete the friction of the left and right segment code areas respectively, thus completing the dual-view friction.

[0011] In the steps described above, the thickness of the shielding sheet in step 1 is 0.05-2mm, and the shielding sheet is made of stainless steel;

[0012] The specific steps for rubbing the right segment code area in step 2 are as follows: set the rubbing angle to a viewing angle of 1:30, use a shielding plate to cover the viewing window area and the left segment code, and then rub the entire surface.

[0013] The specific steps for rubbing the left segment code area are as follows: set the rubbing angle to a viewing angle of 10:30, use a masking plate to cover the viewing window area and the right segment code area, and rub the entire surface.

[0014] Beneficial effects: This invention provides a friction process for a VA segment LCD display. By fabricating a shielding sheet and employing a dual-view friction process, the segment screen of this invention achieves 1:30 and 10:30 viewing angles through two friction directions. The absorption axis angle of the polarizer becomes 0° and 90°, which is consistent with the required angle of the polarizer on the TFT surface. In this way, the brightness of the TFT passing through the segment screen does not decrease excessively, and the transmittance of the resulting display can reach up to 40%, while also having a three-dimensional effect with consistent grayscale on both sides. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the shielding sheet structure in an embodiment of the present invention;

[0016] Figure 2 This is a schematic diagram of the grayscale of a VA segment liquid crystal display in an embodiment of the present invention. Detailed Implementation

[0017] The present invention will now be described in detail with reference to specific embodiments and accompanying drawings: Example 1

[0018] A friction process for a VA segment LCD display includes the following steps:

[0019] Step 1: Based on product requirements, use a stainless steel plate of a certain thickness and use a punch press to manufacture the product as needed. Figure 1 The stainless steel shield shown has perforated areas for friction and non-perforated areas for protection; it is required to completely cover the viewing window area and the left or right segment code area, with a thickness of 0.05-2mm, and be fixed to the friction device.

[0020] Step 2: Rub the right segment code: The viewing angle is 1:30. Set the rubbing angle according to the viewing angle. Move the blocking piece to the left end to cover the viewing window area and the left segment code, and then rub the entire surface.

[0021] Step 3: Friction the left segment code: The viewing angle is 10:30. Set the friction angle according to this viewing angle, move the blocking plate to the right end to cover the viewing window area and the right segment code area, and rub the entire surface; after the dual-view friction process is completed, the subsequent operations can be carried out according to the normal process in the existing technology. Example 2

[0022] A friction process for a VA segment LCD display includes the following steps:

[0023] Step 1: Based on product requirements, produce as follows Figure 1 The stainless steel shield shown is required to completely cover the viewing window area and the left or right segment code area, with a thickness of 0.05-2mm, and be fixed to the friction device.

[0024] Step 2: Rub the left segment code: The viewing angle is 10:30. Set the rubbing angle according to this viewing angle. Move the blocking piece to the right end to cover the viewing window area and the right segment code area, and rub the entire surface.

[0025] Step 3: Friction the right segment code: The viewing angle is 1:30. The friction angle is set according to the viewing angle. Move the shield to the left end to cover the viewing window area and the left segment code, and rub the entire surface. After the dual-view friction process is completed, the subsequent operations can be carried out according to the normal process in the existing technology.

[0026] In the multi-layered stereoscopic display of the VA segment display, the segment screen uses grayscale display, meaning some parts of the display have lower brightness. In this state, the brightness is significantly reduced from the reverse viewing angle, and improper matching can cause inconsistencies in grayscale brightness. The driver's line of sight is symmetrically distributed from the center of the TFT area to both sides, requiring the segment screen to have a 12-point or 6-point viewing angle, meaning the absorption axis angle of the bottom polarizer of the segment screen is 45° or -45°. However, in existing technology, most TFTs have a surface polarizer absorption axis angle of 0°. This results in a 50% brightness reduction in the lower TFT after passing through the segment screen, meaning the overall transmittance of the TFT is only 20%, causing the central TFT display to appear darker. For example... Figure 2 As shown, the segment display of the present invention obtains 1:30 and 10:30 viewing angles through two different friction directions. The absorption axis angle of the polarizer becomes 0° and 90°, which is consistent with the required angle of the polarizer on the TFT surface. In this way, the brightness of the TFT transmitted through the segment display is not significantly reduced. The transmittance of the VA segment liquid crystal display can reach up to 40%, and it has a three-dimensional effect with consistent grayscale on the left and right sides.

[0027] The above description is only a preferred embodiment of the present invention. For those skilled in the art, various corresponding changes and modifications can be made based on the above technical solutions and concepts, and all such changes and modifications should be included within the protection scope of the claims of the present invention.

Claims

1. A friction process for a VA segment liquid crystal display, characterized in that, Includes the following steps: Step 1: Make a shielding plate according to product requirements and fix it on the friction device. The shielding plate can cover the viewing window area and one side of the segment code area at the same time. Step 2: Use a masking plate to cover the viewing area and one side of the segment code area. Set the friction angle according to the viewing angle and rub the uncovered area. Complete the friction of the left and right segment code areas respectively, thus completing the dual-view friction. The specific steps for rubbing the right segment code area are as follows: set the friction angle according to a viewing angle of 1:30, use the masking plate to cover the viewing area and the left segment code, and then rub the entire right segment code area. The specific steps for rubbing the left segment code area are as follows: set the friction angle according to a viewing angle of 10:30, use the masking plate to cover the viewing area and the right segment code area, and then rub the entire left segment code area.

2. The friction process for the VA segment liquid crystal display according to claim 1, characterized in that, The thickness of the shielding sheet in step 1 is 0.05-2mm.

3. The friction process for a VA segment liquid crystal display according to claim 1 or 2, characterized in that, The shielding plate is made of stainless steel.

4. The friction process for the VA segment liquid crystal display according to claim 3, characterized in that, The shielding sheet is a perforated shielding sheet, with the perforated areas being for friction and the non-perforated areas being for protection and not for friction.

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