Composition for forming black matrix, black matrix, display substrate and modification method

Abstract

The invention provides a composition for forming a black matrix, the black matrix, a display substrate and a modification method. The composition forming the black matrix comprises carbon black, wherein active groups are formed on the surface of the carbon black and can enable the carbon black to be converted from an aggregation state to a monodisperse state of nanoparticles. According to the composition provided by the invention, by means of the active groups on the surface of the carbon black, the carbon black can be converted into the monodisperse state from the aggregation state, thus the dispersion effect of the carbon black in the composition for forming the black matrix is greatly promoted, and further the light shading effect of the black matrix is more uniform; in addition, the adhesion strength between the black matrix and a glass substrate is greatly enhanced by means of the improved carbon black. According to the composition for forming the black matrix, a dispersing agent and other coupling agents are not needed to be added, and thus the working procedures are reduced and the cost is saved.

Description

Technical field [0001] The present invention relates to the field of display technology, in particular to a black matrix forming composition, a black matrix, a display substrate and a modification method. Background technique [0002] After decades of development, the thin film transistor liquid crystal display (TFT-LCD) has matured in technology and craftsmanship. It has replaced cold cathode diode (CCFL) displays and has become a mainstream product in the display field. [0003] In the TFT-LCD display panel, due to the chaotic electric field at the metal leads (such as gate lines and data lines), thin film transistors, etc., the light transmission is not controlled and cannot be used for display. Therefore, the light at these positions must be blocked. It is necessary to set the black matrix at these positions. [0004] Since carbon black has good light-shielding properties, it is widely used as the main material for forming the black matrix. However, the black matrix currently u...

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Problems solved by technology

However, the currently used black matrix generally has the following two problems: on the one hand, if figure 1 As shown, carbon black 1 particles are easy to agglomerate to form large aggregate particles with larger particle size (the particle size is generally distributed between 1-10 μm) (such as figure 2 shown), so it is usually necessary to add a dispersant to the material forming the black matrix 3, which not only increases the material cost of the black matrix 3, but also makes the composition of the material forming the black matrix 3 more complicated, and the dispersion effect of carbon black 1 is also far away. It is far from the ideal level, which will directly lead to the uneven shading effect of the black matrix 3

[0005] Nowadays, in order to meet the requirements for the shading performance of the black matrix, it is mainly achieved by increasing the amount of carbon black in the black matrix or increasing the thickness of the black matrix. The direct consequence of this is that the surface gap of the display substrate where the black matrix is ​​located increases. The increase of the surface gap will cause a series of problems, such as the control of the position accuracy of the spacer in the display panel, the friction unevenness caused by the gap when the alignment film is formed by rubbing, etc.

On the other hand, in the reliability test of the display panel, it is found that when the test electrode is peeled off, the black matrix and the display substrate (glass substrate) where the black matrix is ​​located are usually separated under the peeling force, which shows that the black matrix Insufficient bond strength with the glass substrate on which it is placed

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