CN-122018201-A - Wide-temperature-range color development stabilizing method for liquid crystal display screen

Abstract

The invention discloses a wide-temperature-range color development stabilizing method of a liquid crystal display screen, which is characterized in that an electric control birefringence compensation layer is additionally arranged between a lower glass substrate and a lower polaroid through innovative structural design and dynamic compensation mechanism, the layer is formed by stabilizing a liquid crystal material through a polymer network, an initial optical axis direction is 120 degrees and a polarization axis of the lower polaroid forms an included angle of 15 degrees, a temperature sensor and a voltage controller are integrated into the system, the environment temperature is detected in real time, corresponding compensation voltage of 0-10V is applied to a transparent driving electrode, and phase delay drift caused by temperature change is dynamically counteracted through accurately regulating and controlling the effective birefringence index and the optical axis direction of the compensation layer, so that the wide Wen Yuse polarization performance is optimized. The technology is far superior to uncompensated design, always keeps light blue tone, has quick response, does not need special liquid crystal material or box thickness gradient design, and greatly improves the visual quality and reliability of the liquid crystal display in extreme environments.

Inventors

• LI YONG
• XIAO XIAOFANG

Assignees

• 深圳市启建时代科技有限公司

Dates

Publication Date

20260512

Application Date

20260324

Claims (4)

1. 1. The wide-temperature-range color development stabilizing method for the liquid crystal display screen is characterized by comprising the following steps of: S1, providing a liquid crystal display panel, wherein the liquid crystal display panel comprises an upper substrate, a lower substrate, a liquid crystal layer, an upper electrode, a lower electrode, an upper polaroid and a lower polaroid, wherein the upper substrate and the lower substrate are oppositely arranged, the liquid crystal layer is clamped between the upper substrate and the lower substrate, the upper electrode is formed on the inner side of the upper substrate, the lower electrode is formed on the inner side of the lower substrate, the upper polaroid is attached to the outer side of the upper substrate, and the lower polaroid is attached to the outer side of the lower substrate, and the polarization axis directions of the upper polaroid and the lower polaroid are in non-orthogonal configuration at the normal temperature of 25 ℃; S2, arranging an electric control birefringence compensation layer between the lower substrate and the lower polaroid, wherein the electric control birefringence compensation layer is composed of a nematic liquid crystal material stabilized by a polymer network, and an included angle of 10-20 degrees is formed between the initial optical axis direction of the electric control birefringence compensation layer and the polarization axis direction of the lower polaroid; S3, respectively arranging an upper transparent driving electrode and a lower transparent driving electrode on the upper surface and the lower surface of the electric control birefringence compensation layer, and connecting the upper transparent driving electrode and the lower transparent driving electrode to a voltage controller; s4, integrating a temperature sensor in or around the liquid crystal display panel for detecting the ambient temperature T in real time; s5, the voltage controller acquires corresponding compensation voltage V_comp from a pre-stored temperature-compensation voltage mapping relation according to the ambient temperature T, and applies the compensation voltage V_comp to the upper and lower transparent driving electrodes so as to regulate and control the effective birefringence delta n_comp and the equivalent optical axis direction theta_eff of the electric control birefringence compensation layer; S6, carrying out dynamic phase compensation on polarized light transmitted through the liquid crystal layer through the electric control birefringence compensation layer, so that the total color difference delta E ab of the display ground color coordinate of the liquid crystal display panel in a CIE L A B color space is not more than 3.0 in the process of changing the ambient temperature from-30 ℃ to 80 ℃, and the light blue basic tone is maintained.
2. 2. The method of claim 1, wherein the electrically controlled birefringence compensation layer has a thickness of 1.0 to 3.0 microns, exhibits a low birefringence scattering state at a voltage of 0V, and changes to a high birefringence transparent state when a dc voltage of 3V to 10V or a low frequency ac voltage is applied, and the effective birefringence Δn_comp is continuously adjustable in a range of 0.05 to 0.20. The method for stabilizing color development in a wide temperature range of a liquid crystal display according to claim 1, wherein the temperature-compensation voltage mapping relationship is established by: Before leaving the factory, placing the liquid crystal display panel in a temperature-controllable environment, sequentially adjusting the environment temperature to a plurality of standard points T_i (i=1, 2, the..and the n), adjusting the compensation voltage V_comp under each T_i until the display ground color reaches the target color coordinate, recording a corresponding (V_comp, T_i) data pair, fitting to obtain a functional relation V_comp=f (T), and storing the functional relation V_comp=f (T) in a nonvolatile memory of the voltage controller.
3. 3. The method for stabilizing color development in a wide temperature range of a liquid crystal display according to claim 1, wherein the non-orthogonal configuration means that the polarization axis direction of the upper polarizer is 105 ° to 115 °, the polarization axis direction of the lower polarizer is 100 ° to 110 °, and the included angle is 5 ° to 15 °. The method for color stabilization in a wide temperature range of a liquid crystal display according to claim 1, wherein the polymer network stabilized nematic liquid crystal material is prepared by the following process: Mixing nematic liquid crystal monomer, photo-curable difunctional acrylate monomer and photoinitiator according to the mass ratio of 90-95:5-10:0.1-0.5, coating the mixture on a substrate provided with a transparent driving electrode, forming a polymer network skeleton through ultraviolet light partial exposure, and then completely curing to obtain the electric control birefringence compensation layer.
4. 4. The method of claim 1, wherein the voltage controller is integrated into a driving integrated circuit of the liquid crystal display panel, and the adjustment response time of the compensation voltage v_comp is not more than 100 milliseconds. The method for stabilizing color development in a wide temperature range of a liquid crystal display according to claim 1, wherein the liquid crystal layer has a conventional uniform cell thickness structure, the cell thickness is 4.0 to 6.0 micrometers, and no thickness gradient or doped temperature sensitive/photosensitive material is required.

Description

Wide-temperature-range color development stabilizing method for liquid crystal display screen Technical Field The invention relates to the technical field of liquid crystal display, in particular to a wide-temperature-range color development stabilizing method of a liquid crystal display screen based on electric control birefringence compensation, which is suitable for application scenes with severe requirements on color stability, such as vehicle-mounted, industrial control, outdoor information terminals and the like. Background The liquid crystal display screen is widely applied to various electronic devices due to low power consumption, high brightness and mature technology. However, the optical properties of liquid crystal materials are highly sensitive to temperature, in that as the ambient temperature increases, the birefringence of the liquid crystal decreases significantly, resulting in a decrease in the amount of phase retardation of the liquid crystal layer, which in turn causes a change in the polarization state of the transmitted light, manifesting as a shift in the display ground color. This problem is particularly pronounced over a wide temperature range of-30 ℃ to 80 ℃, severely affecting visual consistency and product reliability. To solve this problem, various compensation schemes have been proposed in the prior art. For example, the chinese patent application CN2023107817915 proposes to optimize the polarization effect at high temperature by "dynamically adjusting the polarization angles of the upper and lower polarizers", specifically describing that "when the temperature is increased from 25 ℃ to 80 ℃, the angle of the upper polarizer is adjusted from 110 ° to 107 °, and the angle of the lower polarizer is adjusted from 105 ° to 112 °", however, once the polarizers are bonded to the glass substrate by hot pressing with an optical cement, the polarization axis direction is physically fixed, and the angle rotation cannot be realized during the operation of the device. The scheme lacks a feasible executing mechanism or a material foundation, belongs to functional description and has no practical implementation means, and is difficult to apply in engineering practice. Other schemes include introducing a thickness gradient structure into the liquid crystal layer, doping temperature-sensitive materials, or adopting a multilayer evaporation optical film, and the like, and the methods can relieve color drift to a certain extent, but have the defects of complex process, high cost, low yield or being only suitable for a specific temperature range, and the like. More importantly, the fundamental problem of how to realize full-temperature-domain, real-time and reversible polarization state dynamic compensation on the premise of not changing the internal structure of the liquid crystal box is not solved. Therefore, a new color development stabilizing technology with simple structure, rapid response and integration in the existing production line is needed to meet the urgent demands of the high-end display market for wide-temperature color consistency. Disclosure of Invention The invention aims to provide a wide-temperature-range color development stabilizing method for a liquid crystal display screen, which realizes real-time dynamic regulation and control of polarized light phase by introducing an electric control birefringence compensation layer, so that ground color drift is effectively inhibited within a temperature range of-30 ℃ to 80 ℃, and a polaroid is not required to be physically replaced or the internal structure of a liquid crystal box is not required to be modified. According to one aspect of the present invention, there is provided a wide temperature range color stabilization method for a liquid crystal display, comprising the steps of: S1, providing a liquid crystal display panel, wherein the liquid crystal display panel comprises an upper substrate, a lower substrate, a liquid crystal layer, an upper electrode, a lower electrode, an upper polaroid and a lower polaroid, wherein the upper substrate and the lower substrate are oppositely arranged, the liquid crystal layer is clamped between the upper substrate and the lower substrate, the upper electrode is formed on the inner side of the upper substrate, the lower electrode is formed on the inner side of the lower substrate, the upper polaroid is attached to the outer side of the upper substrate, and the lower polaroid is attached to the outer side of the lower substrate, and the polarization axis directions of the upper polaroid and the lower polaroid are in non-orthogonal configuration at the normal temperature of 25 ℃; S2, arranging an electric control birefringence compensation layer between the lower substrate and the lower polaroid, wherein the electric control birefringence compensation layer is composed of a nematic liquid crystal material stabilized by a polymer network, and an included angle of 10-20 degrees is formed between