Why is output arranged in grid fuzzy (especially when printed)?

Question

If I arrange output in a Grid, which is nice to summarize work, the output ends up greyed (or not bold?) compared to regular output. Here's an example:

ClearAll[ display, nplus, nminus, theta, phi]

display = {theta -> Subscript[θ, 0], phi -> Subscript[ϕ, 0]} ;
nplus = {E^(-I phi) Cos[theta/2], Sin[theta/2]} ;
nminus = {-E^(-I phi) Sin[theta/2], Cos[theta/2]} ;

{#1, " = ", (#2 // FullSimplify) /. display  // TraditionalForm} & @@@ {
   {"|+>", nplus // MatrixForm},
   {"|->", nminus // MatrixForm}
   } // Grid

(nplus /. display) // MatrixForm // TraditionalForm
(nminus /. display) // MatrixForm // TraditionalForm

Which looks like:

The greyed output can be almost unreadable once printed (using a print configuation: Printing Settings -> Printing Environment -> Printout).

What is controlling the Grid vs normal output style, and how can I change it to match the default output style?

Answer 1

Use Style as shown to obtain darker text. Other options also can be applied to change the appearance of the text (diferent fonts, sizes, etc).

Style[{#1, 
     " = ", (#2 // FullSimplify) /. display  // TraditionalForm} & @@@ {
       {"|+>", nplus // MatrixForm},
       {"|->", nminus // MatrixForm}
       } // Grid, Bold]

Addendum

For further improved clarity, consider

Style[{#1, 
     " = ", ((#2 // FullSimplify) /. display  /. {E -> e, I -> i}) // 
      StandardForm} & @@@ {
       {"|+>", nplus // MatrixForm},
       {"|->", nminus // MatrixForm}
       } // Grid, {Bold, 14, "Text"}]

Answer 2

Another solution is to use the MaTeX package, which, together with TeXForm, allows you to get the equations typesetted directly in LaTeX.

In your example, you would do (after having installed the MaTeX package):

Needs["MaTeX`"]
MaTeX[
   ToString@TeXForm[
     MatrixForm[nplus /. display]
    ], 
    Magnification -> 3
]

which produces