Bias shield and method of developing a latent charge image

A method for developing a latent charge image on a photoreceptor which is disposed on an interior surface of a faceplate panel of a cathode-ray tube (CRT) with triboelectrically-charged, dry-powdered, light-emitting phosphor materials, said faceplate panel having a peripheral sidewall, said method comprising the steps of positioning said faceplate panel on a panel support of a developer, said developer including a bias shield comprising two pairs of insulative members, each of said insulative members having two oppositely disposed major surfaces with at least one conductive strip formed on one of said surfaces, said insulative members being located around said peripheral sidewall of said faceplate panel, a tank having a tank sidewall closed at one end by a bottom portion and at the other end by said panel support having an opening therethrough to provide access to said faceplate panel, a back electrode disposed within said tank and spaced from, but substantially parallel to, said interior surface of the faceplate panel;

• grounding said photoreceptor;
• providing a voltage to said conductive strip on said insulative members to prevent said triboelectrically-charged phosphor materials from accumulating thereon and to influence the deposition of said phosphor material;
• providing a positive potential to said back electrode to establish a drift field between said back electrode and said photoreceptor;
• and
• introducing said triboelectrically-charged, dry-powdered, light emitting phosphor material into said tank, between said back electrode and said faceplate panel, said triboelecrically-charged phosphor materials having a charge of the same polarity as the potential applied to said back electrode, whereby said phosphor material is directed toward said photoreceptor on said faceplate panel.