A display module having therein an installation frame and multiple function plates received inside the installation frame, wherein the function plates include at least a light board and an LCD panel; wherein the installation frame is composed of multiple installation strips interconnected together and wherein each one of the installation strips being provided with an installation device through which at least one of the function plates is secured inside the installation frame, wherein the light board includes a base composed of multiple strip-like elements, bolts, and light sources mounted on each one of the strip-like elements; wherein the strip-like elements are detachably mounted through the bolts on an installation face formed on the installation frame, and wherein each of the strip-like elements has a stepped side and a flat side oppositely formed relative to the stepped side such that a step is provided between the flat side and the stepped side; wherein a portion of the flat side of each one strip-like element is detachably placed, in a top plan view of the back of the light board, under the stepped side of an adjacent one of the strip-like elements so as to superpose a portion of said stepped side and so as to provide a gap between the edge of the flat side of each one of said the strip-like elements and a wall formed by the step of said adjacent strip-like element. function plates received inside the installation frame, wherein the function plates include at least a light board and an LCD panel; wherein the installation frame is composed of multiple installation strips interconnected together and wherein each one of the installation strips being provided with an installation device through which at least one of the function plates is secured inside the installation frame, wherein the light board includes a base composed of multiple strip-like elements, bolts, and light sources mounted on each one of the strip-like elements; wherein the strip-like elements are detachably mounted through the bolts on an installation face formed on the installation frame, and wherein each of the strip-like elements has a stepped side and a flat side oppositely formed relative to the stepped side such that a step is provided between the flat side and the stepped side; wherein a portion of the flat side of each one strip-like element is detachably placed, in a top plan view of the back of the light board, under the stepped side of an adjacent one of the strip-like elements so as to superpose a portion of said stepped side and so as to provide a gap between the edge of the flat side of each one of said the strip-like elements and a wall formed by the step of said adjacent strip-like element. wherein the installation frame is composed of multiple installation strips interconnected together and wherein each one of the installation strips being provided with an installation device through which at least one of the function plates is secured inside the installation frame, wherein the light board includes a base composed of multiple strip-like elements, bolts, and light sources mounted on each one of the strip-like elements; wherein the strip-like elements are detachably mounted through the bolts on an installation face formed on the installation frame, and wherein each of the strip-like elements has a stepped side and a flat side oppositely formed relative to the stepped side such that a step is provided between the flat side and the stepped side; wherein a portion of the flat side of each one strip-like element is detachably placed, in a top plan view of the back of the light board, under the stepped side of an adjacent one of the strip-like elements so as to superpose a portion of said stepped side and so as to provide a gap between the edge of the flat side of each one of said the strip-like elements and a wall formed by the step of said adjacent strip-like element.